JPH06103519A - Composite magnetic head device and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a composite magnetic head device which has high recording density, is excellent in mass productivity, and can be manufactured at low cost. A composite magnetic head having a structure in which two magnetic heads are integrally formed by glass bonding and gaps 27 and 28 are arranged in-line, and a read / write gap length and a gap depth are equal, and a C core is provided. Two magnetic heads each having a coil wound only on the half body pair are arranged in parallel and symmetrically with a nonmagnetic insulating layer having a thickness of 5 μm or less formed as a thin film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite magnetic head device for recording / reproducing magnetic information on / from a plurality of data tracks of a magnetic recording medium used in a magnetic recording / reproducing device such as a proppy disk device and a VTR. And a manufacturing method thereof.

[0002]

2. Description of the Related Art FIG. 17 shows, for example, "All About Floppy Disk Devices" by Shoji Takahashi (CQ Publishing Company, November 1989).
FIG. 15 is a perspective view of a tunnel erase-type composite magnetic head device mounted on a conventional FDD (floppy disk drive), which is published on March 15). The composite magnetic head includes a read / write core 11 and an erase / write core. 12, a read / write gap 13, an erase gap 14, a read / write coil 15 wound around the read / write core 11, and an erase coil 16 wound around the erase core 12. Further, the read / write core 11 and the read / write coil 15 constitute a read / write head, and the erase core 12 and the erase coil 16 constitute an erase head.

FIG. 18 is an enlarged view of the disk contact surface of the composite magnetic head device. Regarding the read / write gap 13 and erase gap 14 of the composite magnetic head device of 3.5 inch 1 megabyte specification, one data of the floppy disk device is shown. Read / write gap length 1.5 μm, erase gap length 2.5 μm, track width of read / write head 131 μm, track width of erase head 71 μm × 2, gap distance 590
An example of dimensions such as μm is shown.

19 (A), 19 (B), 20 (A),
20 (B) is a composite magnetic head device used as a magnetic head of a VTR device different from the tunnel erase system shown in FIG. 17, for example, the double azimuth system (two magnetics) described in “Magnetic Head Technology” of Trikeps Co. The gap surface of the head is non-parallel and has an azimuth angle.)
19A shows the structure of the composite magnetic head device of FIG.
0 (A) is a plan view seen from the tape sliding surface side, FIG.
(B) and 20 (B) are front views. 17 is a magnetic head for long-time recording (EP mode), 18 is short-time recording (S mode)
(P mode) magnetic heads, and 19a and 19b are read / write gaps. The major difference between the magnetic heads 17 and 18 is that the recording / reproducing track width of the EP mode magnetic head 17 is narrower than that of the SP mode magnetic head 18.

Next, the operation of the tunnel erase type composite magnetic head device shown in FIGS. 17 and 18 will be described. The composite magnetic head device operates as an electric-magnetic converter or a magnetic-electric converter that records and reproduces magnetic information on a plurality of data tracks of a magnetic recording medium of a floppy disk device.

First, at the time of writing which operates as an electric-magnetic converter, the floppy disk device applies a current corresponding to the data signal of the write information to the read / write coil 15 to the composite magnetic head device, and the read / write operation is performed according to the current value. A strong magnetic field is generated near the gap 13. The magnetic recording medium on the surface of the magnetic disk is magnetized by this magnetic field, and a data signal is written.

Next, at the time of reading, which operates as a magnetic-electrical converter, the magnetic flux of the magnetic recording medium magnetized as described above interlinks with the read / write coil 15, whereby a voltage is induced in the read / write coil 15. At this time, the recorded information is read by extracting the current flowing through the read / write coil 15.

In the above reading process, assuming that the magnetic head is always located at the center of the data track and there is no positional deviation (off-track) of the magnetic head, the magnetic head may be composed of only the read / write head. Erase head is unnecessary. However, in reality, the magnetic head usually has some off-track from the center of the track. Therefore, an erase head is provided behind the read / write head in order to guarantee a guard band between the data recorded on the data track and the data recorded on the adjacent data track even when the off-track occurs. Further, after the data is first written in the data track by the read / write gap 13, the trimming is erased by the erase gap 14.

By the way, as a technique for increasing the capacity (density) of a floppy disk device, (1) a method of increasing the track density on the surface of a magnetic recording medium to increase the number of tracks, and (2) linear recording Increase the density (bit density) to 1
There are two methods: increasing the number of bits recorded on the track.

In order to increase the track density, the positioning of the head by the open loop method using the stepping motor used in the conventional floppy disk device is not sufficient as a measure for off-track where the magnetic head is slightly displaced from the center of the track. Therefore, a servo signal, which is a special signal used for positioning the magnetic head, is written on the magnetic recording medium, the servo signal is read from the magnetic recording medium, and the position of the head is constantly corrected by the magnetic head. A closed loop (track servo) method is used to control so that is always in the correct position.

The erase head is not used in the floppy disk drive of this type. However,
An erase head may be provided in front of the read / write head when the overwrite characteristics of the floppy disk device are emphasized, for example, when a barium ferrite medium having poor overwrite performance is used.

In the case of realizing a large-capacity floppy disk device having a high track density, there is a problem of compatibility with the existing low-density floppy disk device. The magnetic head of a large capacity floppy disk drive is
This is because it is necessary to cope with high and low track densities. In order to solve this problem, for example, Japanese Patent Laid-Open No. 63-
The floppy disk device described in Japanese Patent No. 103408 uses a composite magnetic head having a structure in which a low-density magnetic head and a high-density magnetic head are arranged in parallel at a predetermined interval.

Next, a VTR head used in a VTR (video tape recorder) for recording / reproducing image data on / from a magnetic recording medium similarly to the floppy disk device is basically used as an electric-magnetic converter and a magnetic-electric converter. The general operating principle is the same as that of the magnetic head of the floppy disk device. A general VTR, which is widely used at present, uses two magnetic heads, which are wide and narrow, and when recording a high quality image, writing / reading (recording / reproducing) is performed by a magnetic head having a wide track width. In the case of long-time recording / reproducing with a small tape consumption, recording / reproducing with high track density is performed by a magnetic head having a narrow track width.

Off-track measures have been taken in VTRs as well, and the closed-loop system employed in the large-capacity floppy disk device described above is often used, and the servo signal for head positioning is video tape. It is recorded outside the upper image recording area.

Further, as a prior art of the present invention, a twin core head composed of a ferrite core disclosed in Japanese Patent Laid-Open No. 63-231711 shown in FIG. 45 and a Japanese Patent Laid-Open No. 63-20709 shown in FIG. 46 are disclosed. A twin core head made of a ferrite core, a twin core head made of a metal magnetic multilayer film core disclosed in Japanese Patent Laid-Open No. 3-71407 shown in FIG. 47, and a Japanese Patent Laid-Open No. 2-187909 shown in FIG. A triple core head composed of a ferrite core has been proposed.
As shown in the recording magnetization pattern of the conventional magnetic head shown in FIG. 48, all of these heads are a composite magnetic recording system used in a magnetic recording method in which a plurality of heads simultaneously record on a plurality of recording tracks via a guard band (non-recording area). The head. Of these, the heads of FIGS. 45 to 47 are proposed on the assumption that they are applied to an electronic still camera (video floppy) as described in each specification, and the guard band width of the electronic still camera is, for example, magnetic recording. As described in MR84-31 "In-line Gap Thin Film Head for Metal Sheets", 40 μm,
Taking the head shown in FIG. 45 as an example, the width indicated by the symbol W _{0 in the} drawing corresponds to a guard band width of 40 μm.

Further, as a composite magnetic head device composed of three magnetic heads integrally formed, the above-mentioned Japanese Patent Laid-Open No. 2-18 is used.
No. 7909 gazette is disclosed, but the head disclosed in this patent is simultaneously applied to a plurality of tracks through a guard band which is a non-recording area as shown in the recording magnetization pattern of the prior art of FIG. It was proposed for the recording method for recording.

[0017]

As described above,
It is difficult to realize a large-capacity floppy disk device having a high track density and a high linear recording density by the magnetic recording method using the composite magnetic head including the read / write head and the erase head used in the open loop method of the conventional floppy disk apparatus. There were challenges.

On the contrary, in the closed loop type magnetic recording system consisting only of the read / write head, it is necessary to specially provide an area for recording the servo signal for positioning.
There was a problem that the data area became smaller accordingly.

In order to enable backward compatibility in a large-capacity floppy disk device, a composite magnetic head in which a low-density specification magnetic head and a high-density specification magnetic head are arranged in parallel at a predetermined interval is used. In the conventional magnetic recording method, a low-density specification magnetic head and a high-density specification magnetic head have to be manufactured and combined independently of each other, resulting in poor mass productivity and high cost.

Further, with respect to the VTR head, a magnetic head for long-time recording (EP mode) and a magnetic head for short-time recording (SP mode) must be manufactured and combined independently of each other. There was a problem that it was bad and expensive.

Further, since a multi-track head of an electronic still camera or the like also performs multi-track recording via a guard band, there is a problem that high-track recording density cannot be recorded.

Further, in the method of simultaneously recording on three recording tracks with three magnetic heads via the guard band, there is a problem that recording with high track density cannot be performed.

Further, in the current magnetic head which uses ferrite having a low saturation magnetic flux density and inferior high frequency magnetic characteristics as a core member, a medium having a high coercive force represented by a metal medium suitable for high density recording is used. Is insufficiently recorded,
There is a problem that high frequency magnetic recording is difficult.

The present invention has been made to solve the above problems, and is capable of high-density recording, excellent in mass productivity, and can be manufactured at a low price. An object is to obtain a head device and a manufacturing method suitable for the head device.

[0025]

According to a first aspect of the present invention, there is provided a composite magnetic head device having two read / write gap lengths and a same gap depth, in which a coil is wound only on a pair of C core halves. Magnetic heads are arranged in parallel and symmetrically with a non-magnetic insulating layer having a thickness of 5 μm or less formed thinly, and each gap of the magnetic head is arranged in-line. Controlled by glass grooves provided in the I core half body and the C core half body adjacent to the magnetic insulating layer and each gap, from the side of the C core half body pair to the joint surface of the I core half body and the C core half body. With the configuration in which a notched glass groove is provided, the product of the track width of one head (the narrower track width when the head track width is different) and the thickness of the non-magnetic insulating layer is the gap length and the non-magnetic insulating layer portion. With the product of Value is obtained by the 10 or more.

The composite magnetic head device according to claim 2 is
Read / write gap length and gap depth are equal,
The I-core half body has an integrated structure, and the C-core half body pair around which the coil is wound is provided between the half body pairs to form a thin film having a thickness of 5 μm.
arranged in parallel and symmetrically with a non-magnetic insulating layer of m or less,
And arrange each gap of the magnetic head inline,
Further, each track width of the magnetic head is regulated by a glass groove provided in the I core half body and the C core half body adjacent to the non-magnetic insulating layer and each gap, and the I core half body is extended from the side portion of the C core half body pair. The structure is such that a notched glass groove is provided between the joint surface of the body and the C core half body, and the track width of the head on one side (the narrower track width when the head track width is different) and the thickness of the non-magnetic insulating layer The value obtained by dividing the product by the product of the gap length and the length of the nonmagnetic insulating layer portion is 10 or more.

In the composite magnetic head device according to the third aspect, the non-magnetic material provided between the magnetic heads has a two-layer structure of glass and conductive metal.

In the composite magnetic head device according to the fourth aspect, one of the twin structure magnetic heads is a lower head having a wide track width and the other is an upper head having a narrow track width.

In the composite magnetic head device according to the fifth aspect, two magnetic heads are used as one magnetic head during recording / reproducing, and positioning is performed by outputs from the two magnetic heads during track positioning.

According to the sixth aspect of the present invention, the composite magnetic head device uses the tracks of one of the magnetic heads for high-density recording / reproduction and uses the tracks of both magnetic heads for low-density recording / reproduction. During recording and reproduction, the coil of one magnetic head is short-circuited while the other magnetic head is operating.

A composite magnetic head device according to a seventh aspect uses the tracks of each magnetic head during recording, and
During reproduction, two magnetic heads are used as one magnetic head.

In the composite magnetic head device according to an eighth aspect or the ninth aspect, the track width of one magnetic head or the sum of the track widths of the two magnetic heads is about 2 in front of both magnetic heads.
An erasing head having a double track width is provided.

A composite magnetic head device according to a tenth aspect of the present invention is
The composite heads of the tunnel erase method or the preceding erasing method are arranged in parallel to both magnetic heads at intervals.

According to the eleventh aspect of the present invention, there is provided a method of manufacturing a composite magnetic head device, wherein a plurality of ferrite pieces each having a nonmagnetic film formed on one surface thereof are integrally formed by a glass bonding method via the nonmagnetic film. In addition to forming a piece block, a pair of ferrite piece blocks are integrally formed by a glass bonding method to form a pair of ferrite piece blocks, and a coil groove or the like is formed in this to wind a coil.

A method of manufacturing a composite magnetic head device according to a twelfth aspect of the present invention is to provide a ferrite core with a C core separation groove,
Glass is molded in this groove, and the glass mold side of a pair of ferrite pieces is integrally formed by a glass bonding method via a non-magnetic film to form a C core block pair, and the C core block pair is formed with an I core ferrite. The pieces are united together by a glass bonding method, a coil groove is formed in the C core block pair, and the coil is wound.

The composite magnetic head according to any one of claims 13 to 15 is a triple-structured magnetic head composed of three independent magnetic heads having operating gaps arranged in-line, and an erasing head is integrated in front of this head. And these magnetic heads are integrally formed by glass bonding.

In the method of manufacturing the composite magnetic head device according to the sixteenth aspect, the non-magnetic insulating layers are arranged in parallel with each other.
Among the individual magnetic heads, ferrite pieces forming members of two magnetic heads located on both sides are provided with C core separation grooves, and glass is molded in the grooves, and the ferrite pieces and the glass molding of the ferrite pieces. A ferrite core forming a member of the magnetic head located at the center among the three magnetic heads is integrally united by a glass bonding method with a non-magnetic film on the side to form a C core block. Located on both sides of the core block 2
A groove for restricting the track width of each magnetic head is provided, and the I core ferrite piece provided with the groove and the C core block are integrally combined by glass bonding, and a coil groove is provided in the C core block. The coil is wound around the coil groove.

A composite magnetic head device according to claim 17 is
Read / write gap length and gap depth are equal,
The gap is arranged in-line, and the I core leg and the C core leg are symmetrically arranged with a metal multi-layer magnetic film.
Two magnetic heads of a twin type constituted by a pair of core halves are provided.

The composite magnetic head device according to claim 18 is
The two magnetic heads have the same track width, and the shapes are symmetric with respect to the non-magnetic insulating layer separating the half pairs of the C core legs of the two magnetic heads. Equally, the reproduction sensitivity difference between the two magnetic heads is 10% or less.

The composite magnetic head device according to claim 19 is
The product of the track width (narrow track width when the track widths are different) of the adjacent heads and the thickness of the non-magnetic layer divided by the product of the gap length and the length of the non-magnetic insulating layer is 10 or more. Is.

The composite magnetic head device according to claim 20 is
A magnetic head having a narrower track width is independently used for the recording operation of the high density specification, and the two magnetic heads are operated as one magnetic head during the recording operation of the low density specification.

The composite magnetic head device according to claim 21 is
The I-core leg is a monolithic structure of Mn-Zn without an isolation insulating layer.
It is formed of ferrite or Ni-Zn ferrite.

The composite magnetic head device according to claim 22 is
A tunnel erasing head is provided behind two twin type magnetic heads.

According to a twenty-third aspect of the present invention, there is provided a method of manufacturing a composite magnetic head device, wherein a metal multilayer magnetic film is formed on a ceramic piece substrate having a separation groove formed thereon via an insulating film, glass is then molded into the separation groove, and the insulating film is formed. Forming to form a twin core block, and separating this twin core block into a C core leg portion and an I core leg portion, and forming a glass groove in each of the C core leg portion and the I core leg portion, and the I core A step of forming a gap material on the leg portion, a step of sequentially forming a U-shaped groove and an L-shaped groove on the C core leg portion, and then forming a gap material on the glass groove side surface, and an I core leg portion The step of incorporating the C core leg portion and inserting the glass rods into the glass grooves of both and integrating them by welding is introduced.

According to a twenty-fourth aspect of the present invention, in a method of manufacturing a composite magnetic head device, a groove for separating both magnetic heads is provided in a pair of non-magnetic ceramic substrates, and then a metal magnetic multilayer film is formed on the surface provided with the groove. Then, glass is molded in the groove, the glass mold side is united by glass bonding through a non-magnetic film, and the block is opposed at an intermediate position between the portions where the metal magnetic multilayer film is opposed through the non-magnetic film. I core half body and C core half body are produced by cutting perpendicular to the surface to be formed, and a groove for winding a coil is provided on the C core half body and a glass groove for joining both core half bodies is provided, Finally, both cores are integrated by glass bonding.

In the composite magnetic head device according to the twenty-fifth to twenty-seventh aspects, the operating gaps are arranged inline.
A triple-structured magnetic head consisting of independent magnetic heads is provided. An erasing head is integrally arranged in front of this head, and these magnetic heads are integrally formed by glass bonding. .

In the method of manufacturing a composite magnetic head device according to a twenty-eighth aspect of the invention, a groove for separating the magnetic head located at the center and the magnetic heads located on both sides is provided in two non-magnetic ceramic pieces, and then the groove is formed. A metal magnetic multilayer film is formed on the provided surface, glass is then molded in the groove, and then one piece out of the two pieces having a nonmagnetic film formed on the glass molding surface is a nonmagnetic film. After forming a metal magnetic multilayer film on the above, these pieces are united by glass bonding, and the united block is perpendicular to the facing surface at a position midway between the portions where the metal magnetic multilayer film faces through the non-magnetic film. By cutting into two pieces, an I core half body and a C core half body are produced, a groove for winding a coil is provided on the C core half body, and a glass groove for joining the both core half bodies is provided. Glass core It is intended to together by bindings.

[0048]

According to the present invention, two magnetic heads having the same read / write gap length and gap depth are arranged in parallel with each other through a non-magnetic material, and each gap of the magnetic heads is arranged in-line. Since the twin structure is employed, and the insulating layer between the heads is thin and the insulating layer length is short, crosstalk between the heads is small, and the guard shown in the recording magnetization pattern of the head according to the present invention shown in FIG. A head capable of high-density recording close to bandless can be provided at low cost.

According to a second aspect of the present invention, the C core portions around which the coils of the two magnetic heads having the same read / write gap length and gap depth are wound are integrally formed via a non-magnetic material, and the coils are also formed. Since the I core portion of the integral structure in which the core is not wound is formed integrally with the C core portion via the gap portion, the productivity of the head is further improved. Moreover, since the structure in which the insulating layer between the C cores is thin and the insulating layer length is short can be easily realized, crosstalk between the heads is small, and high-density recording with a high track density is possible.

In the third aspect, the nonmagnetic material between the magnetic heads is made of glass and a conductive metal, and an eddy current reaction occurs to suppress crosstalk between the magnetic heads.

According to another aspect of the present invention, one magnetic head is a lower head having a wide track width, and the other magnetic head is an upper head having a narrow track width, and has a backward compatibility function.

According to a fifth aspect of the present invention, two magnetic heads are used as one at the time of recording / reproducing, and the output signals from the two magnetic heads are used as comparison signals at the time of track positioning, and the signal levels from both magnetic heads are used. The magnetic head is positioned so that

In the sixth aspect, only the track of one magnetic head is used at the time of high density recording / reproducing, and at this time, the coil of the other magnetic head is short-circuited.

According to the seventh aspect of the present invention, the recording is divided by the two magnetic heads at the time of recording, and the two magnetic heads operate as one magnetic head at the time of reproduction, so that recording with a higher linear density is possible.

According to the eighth or ninth aspect of the present invention, an erasing head having a double track width is provided in front of both magnetic heads to enable pre-erasing.

According to a tenth aspect of the present invention, a tunnel erase or preceding erase type composite head is provided in parallel with both magnetic heads at intervals.

In the eleventh and twelfth aspects, the twin structure composite magnetic head is integrally formed by a glass bonding method or the like.

In the thirteenth to sixteenth aspects, 3
Since each head can be used as an independent head, recording of high density specifications with high track density becomes possible, and by connecting coils of 3 heads in series, heads with wide track width and low density specifications can be obtained. It is also possible to combine the two heads with each other, and by using the two outer heads of the three heads for comparison signals, highly accurate tracking servo can be realized, and these heads are integrally formed. Therefore, the device can be realized at low cost.

According to a seventeenth aspect of the present invention, by using a metal multilayer magnetic layer film having higher high frequency permeability and saturation magnetic flux density and lower sliding noise than ferrite for the C core leg and the I core leg, a high coercive force can be obtained. A magnetic recording / reproducing apparatus having an excellent S / N ratio suitable for high-density recording on a metal medium and high-frequency recording with a high transfer rate is realized.

In the eighteenth aspect, the two magnetic heads have the same track width, and the two magnetic heads are symmetrical in shape with respect to the non-magnetic layer separating the half pairs of the C core legs of both magnetic heads. Since the number of windings of the coil is the same, it is possible to realize high-density recording using a servo system in which reproduced signals of two magnetic heads are compared.

In the nineteenth aspect, the track width of one of the adjacent heads (if the track widths are different,
By setting the value of the product of the narrow track width) and the thickness of the non-magnetic layer divided by the product of the gap length and the length of the non-magnetic insulating layer to be 10 or more, crosstalk between both magnetic heads is suppressed.

According to a twentieth aspect of the present invention, the magnetic head having the narrower track width is used alone during the recording operation of the high density specification, and both magnetic heads are set to 1 during the recording operation of the low density specification.
By operating as a single magnetic head, a large capacity FDD having a completely backward compatible function with the current model is realized.

In the twenty-first aspect, even if the I core leg is made of ferrite, since the metal multilayer magnetic film is formed on the C core leg, high density recording on a metal medium having a high coercive force and high frequency with a high transfer rate. It is possible to realize a magnetic recording / reproducing apparatus which enables recording and has an excellent S / N ratio.

In claim 22, the twin type 2
By providing a tunnel erasing head after each magnetic head, it can be applied to a high recording density magnetic recording / reproducing apparatus having a completely backward compatible function with the current model.

In the twenty-third and twenty-fourth aspects, the device can be manufactured at low cost by integrally forming the head.

In claims 25 to 28, 3
Since each head can be used as an independent head, recording of high density specifications with high track density becomes possible, and by connecting coils of 3 heads in series, heads with wide track width and low density specifications can be obtained. It is also possible to combine the two heads with each other, and by using the two outer heads of the three heads for comparison signals, highly accurate tracking servo can be realized, and these heads are integrally formed. Therefore, the device can be realized at low cost.

[0067]

【Example】

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figure 1
1 is a perspective view of a twin-structured composite magnetic head device according to Example 1. FIG. As shown in FIG. 1, the composite magnetic head device includes Mn—Zn ferrite and Ni— which form a magnetic circuit.
A magnetic body (magnetic core) 21 made of a single crystal or polycrystalline metal oxide such as Zn ferrite, a high melting point glass 22 for magnetically separating the two magnetic heads, and a magnetism of the two magnetic heads. A low melting point glass 23 for integrally forming a pair of core halves, a low melting point glass 24 filled in a groove for regulating the track widths of two magnetic heads, and a groove 31 for inserting coils of two magnetic heads. Of the low melting point glass 25 filled in the contact surface side of the magnetic disk and the sendust (Fe-Si-Al) alloy or Co-Zr formed by a thin film forming technique such as sputtering in order to generate a strong magnetic field in the magnetic gap. A metal magnetic body 26 represented by -Nb amorphous alloy, read / write gaps 27 and 28 of two magnetic heads, and read / write coils 29 and 30 of two magnetic heads. , Back core 32 of the magnetic core of the same type as the material for the shunt to be attached after the coil insertion
It is composed of a and 32b.

In FIG. 1 and other embodiments, the separation layers made of the high melting point glass 22, the gaps 27, 28, etc. are expressed wider than the actual width for easy understanding.

Further, the metal magnetic body 26 is formed on the gap surface of the pair of I core halves arranged rearward with respect to the approaching direction of the magnetic disk. It is not desirable from the viewpoint of crosstalk to form a metal magnetic material on the gap surface of the magnetically separated pair of C core halves. With respect to the ferrite head in which the metal magnetic body 26 is not formed, there is no problem even if the C core half body pair is arranged rearward with respect to the magnetic disk entry direction.
Further, in the read / write gaps 27 and 28, SiO ₂ ,
A nonmagnetic film such as Al ₂ O ₃ is formed into a thin film by sputtering or the like.

Next, a method of manufacturing the composite magnetic head device having the configuration of FIG. 1 will be described with reference to FIGS. First, FIG. 2 is a perspective view of a single-crystal or polycrystalline metal oxide Mn—Zn ferrite piece 33 finished to a desired size by grinding, lapping, or the like. Alternatively, the surface on which the crystallized glass is formed into a thin film is mirror-finished.

FIG. 3 shows a high melting point glass (or crystallized glass whose softening temperature after fusion becomes higher than the fusion temperature) having a thickness of 1/10 to several tens of microns on one surface of the Mn-Zn ferrite piece 33. The high melting point glass 34 is formed by a printing method using glass powder having a small particle diameter, a precipitation method, a sputtering method, an evaporation method, or the like.

FIG. 4 shows a perspective view of a plurality of Mn-Zn ferrite pieces 33 having a high melting point glass 34 formed on the surface, which are integrally fused and formed.
3 are arranged as shown in the drawing, a load is applied in the direction shown by the arrow, and the temperature is raised in that state to integrally form the fusion-bonded pieces to form the ferrite piece block 37.
FIG. 5 shows a perspective view of a half ferrite piece block 35 formed by cutting the Mn-Zn ferrite piece block 37 integrally formed by fusion bonding in the longitudinal direction into a half size.

FIG. 6 shows half Mn-cut in half.
The one side of the Zn ferrite piece block 35 is mirror-polished, and then a glass groove 35b for inserting a glass rod is formed on this mirror surface 35a.
5b is formed by cutting using a diamond wheel.

In FIG. 7, a metal magnetic film 36 of sendust or the like having a thickness of several microns is formed on the surface of the half Mn-Zn ferrite piece block 35 on which the glass groove 35b is provided, and then half the gap length. Si of considerable thickness
A perspective view of a thin film of a non-magnetic film (not shown) such as O ₂ or Al ₂ O ₃ formed by sputtering is shown.
In addition, FIG. 8 shows the other half Mn obtained in the step of FIG.
-Zn ferrite piece block 35 has a glass groove 35b.
And an apex groove 35c for restricting the gap depth are formed by cutting, and then the surface provided with the grooves 35b, 35c has a thickness equivalent to ½ of the gap length of SiO ₂ or Al, as in FIG. _A perspective view of a thin film of a non-magnetic material film (not shown) such as ₂ O ₃ formed by sputtering or the like is shown.

In FIG. 9, the half Mn-Zn ferrite piece blocks 35 obtained in the steps of FIGS. 7 and 8 are combined and arranged as shown, and the high melting point glass 34 used in the step of FIG.
A perspective view of a glass rod 38 having a lower melting point inserted into the glass grooves 35b, 35b and the apex groove 35c and integrally formed by fusion is shown, and a load is applied to the two half Mn-Zn ferrite pieces 35 in the arrow direction, In that state, the temperature is increased to integrally form the fusion-bonded half Mn-Zn.
The ferrite piece block pair 39 is formed.

FIG. 10 is a perspective view of a half Mn-Zn ferrite piece block pair 39 in which a track width regulating groove 40 and a head chip separation preliminary groove 41 are cut.
The half Mn-Zn ferrite piece block pair 39 is cut so that the surface on which the track width regulating groove 40 is provided has a predetermined dimension, and then the plurality of track width regulating grooves 4 are formed.
0 is cut. After that, a head chip separation preliminary groove 41 is provided by cutting on the side opposite to the track width regulation groove 40. 42 is glass molded in the grooves 35b and 35c.

FIG. 11 is a perspective view of the groove 40, 41 molded by using a glass rod similar to the glass rod 38 used in the step of FIG. 9, and the half Mn-Zn ferrite piece block pair 39 is shown in each. A glass rod is inserted into the grooves 40 and 41, and the temperature is raised with a load applied in the direction of the arrow to mold the glass 42 into the grooves 40 and 41. FIG. 12 shows a half Mn-Zn ferrite piece block pair 39 with coil insertion grooves 43 and 44.
Showing a perspective view of a coil insertion groove 43, 4
4 is formed by cutting.

FIG. 13 is a perspective view of a head chip 45 obtained by slicing the half Mn-Zn ferrite piece block pair 39 shown in FIG. 12, and a read / write coil is wound around the head chip 45 to shunt the magnetic circuit in the back core. The composite magnetic head device of FIG. 1 is formed by forming the.

Next, the operation of the composite magnetic head device manufactured as described above will be described. First, a magnetic recording / reproducing apparatus (that is, a large-capacity floppy disk apparatus or a fixed magnetic disk apparatus using a tracking servo adopting a new data positioning system) is used as the head apparatus as described in JP-A-50-15520. ), The following operation is performed.

When information is recorded / reproduced on / from a data track of a magnetic recording medium of a floppy disk device, two recording / reproducing coils of a twin structure composite magnetic head are connected in series and used as a single magnetic head. Therefore, in this case, the recorded track width is the sum of the track widths of both magnetic heads.

On the other hand, in the head positioning operation of the composite magnetic head device for performing tracking servo by the closed loop system, both magnetic heads are used as independent reproducing heads, and the reproducing signals of the data tracks read from both heads are compared by the comparing circuit. Do by comparing. When the reproduction signal is used as the comparison signal, the track widths of the two magnetic heads may be different when amplifiers having different gains are used in the comparison signal circuit.

In order to perform head positioning with high accuracy in the tracking servo control, it is desirable that both magnetic heads have the same recording / reproducing performance. For example, in order to realize the off-track of one-tenth of the recording track width of one magnetic head by the tracking servo control, in FIG. 42 (in the figure, the vertical axis represents the off-track width of the track width of two heads). It is necessary to set the sensitivity ratio of both magnetic heads to 0.9 or less, as indicated by the value obtained by dividing by the sum, and the horizontal axis shows the difference between the reproduction outputs of the two heads divided by the reproduction output of the head with high sensitivity. . For that purpose, it is necessary to suppress the difference between the two heads to several percent or less in each of the magnetic gap length, the gap depth Gd shown in FIG. 15, and the overall dimension. In the case of the composite magnetic head device of the first embodiment, as is clear from the above description of the manufacturing method, the condition can be easily satisfied. Furthermore, crosstalk between both magnetic heads, that is, magnetic interference can be mentioned as a factor related to the accuracy of tracking servo control.

In this recording method, two heads are set to 1 at the time of recording.
It operates as a head. In this case, if the two magnetic heads have the same effective magnetic permeability, the recording magnetization state and reproduction sensitivity of the two magnetic heads are the same, and off-track due to crosstalk does not occur. The crosstalk becomes a serious problem when it is used in a recording method in which two magnetic heads, which will be described later, are operated independently. In this case, even if the two heads have the same sensitivity, the magnetization states of the adjacent tracks are different, so that the crosstalk of the reproducing system becomes a particular problem. In order to reduce this crosstalk, it is effective to widen the distance between the cores of both magnetic heads, like the head for an electronic still camera. Since the number of zones increases, the recording density decreases, which is not desirable. Therefore, in the head according to the present invention, the two heads are brought close to each other as much as possible, and the two heads are separated by an insulating layer having a thickness of 5 μm or less. Further, the insulation length of the C core portion is shortened, and the track width of one head ( When the head track width is different, the product of the narrower track width) and the thickness of the non-magnetic insulating layer divided by the product of the gap length and the length of the non-magnetic insulating layer is set to 10 or more, and the crosstalk is set. It has achieved a record close to that of a guard bandless. As is clear from the result of calculating the relationship between the crosstalk and the core dimension shown in FIG. 43, which will be described later,
Crosstalk of about 0.1 or less in the practical range can be obtained. Further, in order to utilize the eddy current reaction between both heads, it is effective to provide a conductive metal non-magnetic film on the insulating layer of each magnetic head. Specifically, the high melting point glass 22
Instead of the above, one having a two-layer structure of glass and a conductive metal may be used.

If the tracking servo system suitable for increasing the capacity is adopted as described above, the conventional recording / reproducing by the conventional sector servo system magnetic head device described in "All of the floppy disk devices" described above is adopted. Since it is not necessary to provide a special servo data area in a part of the data track area as compared with the recording track, the linear recording density (bit density) can be improved and the peripheral circuit can be simplified. It is possible to reduce the price.

Embodiment 2 Next, as in the composite magnetic head device described in Japanese Patent Laid-Open No. 63-103408, in which a head of low density specification and a head of high density specification are arranged in parallel with a gap, The operation when used as a magnetic head of a large-capacity floppy disk device having a compatible function will be described. As described above, in order to realize a large-capacity floppy disk device that is compatible with the existing low-density floppy disk device, it is necessary to cope with high and low track densities. The composite magnetic head device of the second embodiment shown in FIG. 16 in which the preceding erasing head is provided in front of the composite magnetic head having the twin structure (with respect to the rotating direction of the magnetic recording medium) is optimum for achieving such an object. Have a structure.

In FIG. 16, the in-line two-gap magnetic head with the preceding erasing head is the composite magnetic head unit 4
6 and an erasing head 47 having an erase gap 48
And a composite magnetic head device 46 having a twin structure and a non-magnetic center spacer 49 made of glass or the like for magnetically insulating and separating the erasing head 47.

By the way, in the floppy disk device,
Ensuring data compatibility is very important in satisfying user requirements. Therefore, taking the present 3.5-inch 2 MB (megabyte) floppy disk device as an example, it has a function of reading and writing a 1 MB floppy disk magnetic recording medium for backward compatibility. As described above, in order to popularize a large-capacity floppy disk device whose track density is different from that of the conventional model, it is necessary to have compatibility with the lower-level model, and in order to realize compatibility, the high-density specification A composite magnetic head structure consisting of an upper magnetic head with a narrow track width and a lower magnetic head with a low density specification and a wide track width must be adopted.

The erasing head 47 arranged in front of the read / write head is used as a preceding erasing head for off-track measures of a lower-order floppy disk device which does not employ tracking servo. The track width of the preceding erasing head is set to about twice the track width of the read / write head. Incidentally, the preceding erasing head method has recently been changed to JI.
It became S-type and was put to practical use in a 4MB floppy disk device having a backward compatibility function with a 2MB / 1MB machine.

In FIG. 16, one magnetic head of the twin structure composite magnetic head device is used as an upper head as described above. In this case, the tracking servo uses the conventional sector servo system. When two magnetic heads having different track widths are adjacent to each other, crosstalk between the two heads becomes a problem. In the second embodiment, when one of the read / write heads is operated, the other read / write coil is electrically short-circuited so that the leakage magnetic flux does not flow back. In order to suppress the crosstalk more effectively, the thickness of the insulating layer between the twin cores is reduced and the length of the insulating layer portion of the C core is shortened.
It is desirable to provide a conductive metal non-magnetic film such as copper for utilizing the eddy current reaction between the insulating layers between the individual magnetic heads.

The composite magnetic head device according to the first and second embodiments is a composite magnetic head in which heads of low density specification and high density specification, which are independently manufactured and are described in JP-A-63-103408, are arranged in parallel. Compared to the device, since two magnetic heads with a twin structure are integrally formed, it can be manufactured at low cost,
Moreover, there is an advantage that the gap positions of both heads can be arranged inline.

As for the VTR head, as described in the prior art, the double azimuth head system using the magnetic heads having different track widths in the long time mode and the short time mode has a high head price, and the two magnetic heads have a relative head. Although there was a problem that the alignment was difficult,
The twin-structured composite magnetic head device of 2 has advantages that the head can be manufactured at a low price and that the relative positioning of the two magnetic heads is unnecessary.

The composite magnetic head device of Examples 1 and 2 was used for VT.
When used as an R head, first, the track width of one of the twin-structured composite magnetic heads is set to the track width for long-term recording / reproducing. Further, the track width of the other magnetic head is set such that the sum of the track width for long-time recording / reproducing is just the track width for short-time recording / reproducing.

When the recording / reproducing is used for a long time, only the magnetic head whose track width is set for the long time is used. In this case, since both heads are close to each other, crosstalk between both heads becomes a problem. That is, at the time of recording, when a current corresponding to a data signal is passed through one of the read / write coils, leakage magnetic flux returns to the other magnetic head,
Recording from the other magnetic head is also performed on the magnetic recording medium with the gap magnetic field. Further, during reproduction, the magnetic flux reproduced by one of the magnetic heads similarly flows back to the other head core, resulting in deterioration of image quality. In order to avoid this phenomenon, when one magnetic head is operating, the coil of the other magnetic head is electrically short-circuited. Then, a reaction magnetic flux is generated by the induced current due to the short circuit, and it is possible to prevent the magnetic flux from flowing back due to the proximity of both heads during recording and reproduction.

Next, at the time of recording / reproducing for a short time, the two magnetic heads having the twin structure are operated as a single magnetic head. In this case, the coils of both heads may be connected in series, but if matching with the inductance of the magnetic head for recording / reproducing for a long time is required, it is better to provide another coil. Since the non-magnetic layer between both magnetic heads is a non-recording layer, it is desirable that the non-magnetic layer be 5 μm or less.

In the first embodiment, as shown in FIG. 1, the structure without the erasing head is shown. However, when a barium medium having a poor overwrite characteristic is used, the erasing head 47 is provided in front of the read / write head. 14 may be a composite magnetic head device having the structure shown in FIG.

Example 3 FIG. 21 is a perspective view of a composite magnetic head device according to Example 3, wherein 50 and 51 are Mn-Zn ferrite and Ni-, respectively.
C core portion of a read / write core that constitutes a twin core made of a single-crystal or polycrystalline high-permeability metal oxide such as Zn ferrite or a high-permeability metal magnetic material represented by sendust (Fe-Al-Si alloy) , 52 are C core parts 50,
I core portion of a magnetically integrated read / write core made of the same member as 51, 53 and 54 are core portions 50 to 52, respectively.
A back core that is made of the same material as the above and magnetically shunts the core parts 50 to 52, 55 to 57 is a glass having a working temperature of 500 to 1000 ° C. represented by lead glass, and 58 is S.
A read / write gap made of iO ₂ , Al ₂ O ₃ , lead-based glass or the like, which is formed into a thin film by sputtering or vapor deposition, 59 is a twin-structured C core portion 50, 51 made of the same member as the read / write gap 58 is magnetic The insulating layers 60 and 61 are separated from each other and are read / write coils independently wound around the C core portions 50 and 51.

Further, FIG. 22 shows the details of the portion A in FIG.

Next, a method of manufacturing the composite magnetic head device according to the third embodiment having the above structure will be described. First, FIG.
As shown in, the ferrite piece 62 is formed by finishing a single crystal or polycrystal Mn-Zn ferrite material to a predetermined size by grinding, lapping, or the like. Next, as shown in FIG.
And the glass insertion grooves 64 and 65 are formed.

Next, as shown in FIG. 25, a high melting point glass 66 is molded in the C core separation groove 63, the surplus portion is removed, and the surface of the high melting point glass 66 is flatly polished. Next, as shown in FIG. 26, a non-magnetic insulating film 67 for preventing magnetic crosstalk between C cores is formed on the surface of the high melting point glass 66, and a C core block 68 is formed. Next, as shown in FIG. 27, a plurality of C core blocks (10 in the figure) 68 are united, and melted at a temperature such that the surface of the high melting point glass 66 melts in a state where a load is applied in the direction of the arrow. A medium melting point glass rod 69 is inserted into the glass insertion grooves 64 and 65, and the temperature is raised to integrally weld all the C core blocks 68.

Next, as shown in FIG. 28, a U groove 70 is formed in the C core block pair 75 in order to form the C structure core portions 50 and 51 having the twin structure (to simplify the drawing from this step). Only one block is shown). Next, as shown in FIG. 29, an apex V groove 71 that defines the gap depth Gd of the twin head is formed in the C core block pair 75.
FIG. 35 shows a surface connecting the centers of the track widths (XX in FIG. 34).
It is a figure which shows the front view of a twin head when it cut | disconnects by the (line), and clearly shows the gap depth Gd.

Next, as shown in FIG. 30, a groove 72 for restricting the track width of the C core portions 50, 51 of the twin head is formed in the C core block pair 75, and a gap material is formed on the gap surface. Next, as shown in FIG.
A single crystal or polycrystal Mn-Zn ferrite material is finished into a predetermined size by grinding, lapping, or the like to form the processing ferrite piece 73 of the I core portion 52. next,
As shown in FIG. 32, a groove 74 that restricts the track width of the I-core portion 52 of the twin head is formed in the ferrite piece 73, and a gap material is formed on the gap surface.

Next, as shown in FIG. 33, the ferrite piece 73 and the C core block pair 75 are united, the medium melting point glass 76 is molded in the track width regulating grooves 72 and 74 to be integrated, and then the alternate long and short dash line A, It cuts along A'and C, and further forms the U groove 77 along a dashed-dotted line BB '. FIG. 34 shows a twin head chip thus obtained, in which the read / write coils 60 and 61 are wound around the chip, and back cores 53 and 54 for shunts are added, so that the twin structure composite shown in FIG. A magnetic head device is obtained.

Next, the operation of the composite magnetic head device manufactured as described above will be described. First, the head device is suitable for a large-capacity floppy disk device (FDD) or a fixed disk device (HDD) that employs the tracking servo technology based on the new data positioning method disclosed in Japanese Patent Laid-Open No. 50520/50. When used as, the operation is as follows. When recording / reproducing data information on / from a magnetic recording medium, two recording / reproducing coils 60 and 61 of a twin-structured composite magnetic head are connected in series and used as one magnetic head. Therefore, the recording track width is the sum of the track widths of both heads.

On the other hand, the head positioning operation by the tracking servo technique is performed by using both heads as independent reproducing heads and comparing the reproduced signals of the data tracks by both heads. At this time, in order to perform the head positioning operation with high accuracy, it is desirable that both heads have the same recording / reproducing performance. For example, in order to realize the off-track performance of 1/10 of the recording track width of one head, it is necessary to set the sensitivity ratio of both heads to 0.9 or less. For that purpose, the gap length and the gap depth are required. It is necessary to prepare other dimensions and reduce the difference to a few percent or less. In Example 3, this condition can be easily achieved as is clear from the manufacturing method.

FIG. 44A shows a recording magnetization pattern at the time of two-divided recording, and FIG. 44B shows a reproduction output waveform. Figure 44
(A) is a magnetization pattern in which two heads are separately used and shifted by a half bit length, and the distance between transition regions is called a bit length. The shortest bit length depends on the gap length of the head. However, it is necessary to shorten the head gap length for short bit recording. FIG. 44B shows a reproduction output waveform when two heads are operated as one head. By adopting such a recording method with a twin head, a conventional recording method with a single head having the same gap length is used. The effective recording bit length can be halved, and the data transfer rate can be doubled while maintaining the conventional low density recording medium and the head gap length.

If the tracking servo system suitable for increasing the capacity is adopted in this way, a servo data area is specially added to a part of the data area of the conventional recording track described in "All of floppy disk devices" mentioned above. In comparison with the sector servo system in which the magnetic recording / reproducing apparatus is provided, the amount of data recorded can be improved, the peripheral circuit can be simplified, and the cost of the magnetic recording / reproducing apparatus can be reduced.

[Embodiment 4] Next, a large-capacity FD having a compatibility function with a conventional open-loop system (each 1, 2, and 4 megabyte FDD) is provided.
In order to realize D, a single head slider is provided with a required distance from a twin-structured composite magnetic head, and the conventional two
FIG. 36 shows an MB or 1 MB tunnel erase type head arranged in parallel. Although not shown, naturally, heads of the prior erasing method used in the FDD of 4 MB as low density specification heads are arranged in parallel. In FIG. 36, 78 is a twin structure high magnetic recording density composite magnetic head device shown in FIG. 21, 79 is FIG.
It is a conventional tunnel erase type composite magnetic head device shown in FIG. 18 which uses low density. Reference numerals 80 to 82 denote slider materials made of high hardness ceramics such as calcium titanate and barium titanate. The head coil is not shown.

The conventional open loop system adopts a system having the same track density but different linear recording densities in order to guarantee compatibility between models having different capacities, in order to realize a high track density FDD. 36 has the configuration shown in FIG. 36 from the viewpoint of guaranteeing compatibility. In this case, the composite magnetic head device 79 of the tunnel erase method or the preceding erasing method is used for the recording of the low density specification, and the composite magnetic head device 78 of the twin structure is used for the recording of the high density specification.

Embodiment 5 FIG. 37 shows the structure of a composite magnetic head device according to Embodiment 5, in which two twin heads are provided in front of the composite magnetic head device 78 shown in FIG. 19 via a magnetic insulating layer (center spacer). The preceding erasing head has a track width which is about twice the sum of the two track widths. In the figure, 83
Is an erasing head integrally provided in front of the composite magnetic head device 78 via a magnetic insulator 84 made of glass, ceramics or the like. In the case of glass, the magnetic insulator 84 is glass-welded and In the case of etc., it is organically bonded. Reference numeral 85 denotes an I core portion of the erasing head 83, which is made of the same magnetic material as the read / write cores 50 to 52, and 8
6 is a magnetic insulator made of glass or the like provided to prevent magnetic crosstalk between the read / write head and the erase head 83, 87 and 88 are glasses made of the same material as the glasses 55 and 56, and 89 is a read. Light core 50-52
C core portion of the erasing head made of a magnetic material of the same member as
0 is an erasing coil wound around the C core portion 89, and 91 and 92.
Is a back core made of the same magnetic material as each core material, and 93 is an erase gap. In the fifth embodiment, two magnetic heads are used for divided recording during recording, and two magnetic heads are operated as one magnetic head during reproduction. By adopting such a recording method, it is the magnetic characteristics of the magnetic medium (mainly coercive force) and the gap length of the head that influence the linear density of the magnetic recording, but the same gap length as the conventional magnetic head is used. Higher linear density (2 times)
A large capacity FDD or HDD capable of recording can be realized by a magnetic head having a twin structure with an in-line gap. Furthermore, by providing the erasing head 83 in front of the twin head, if the sum of the track widths of the two heads is matched with the track width of the lower-level machine, it is cheaper and has a higher capacity open-loop backward compatibility function. FDD can be realized.

Embodiment 6 FIG. 38 shows the structure of a composite magnetic head device according to Embodiment 6, and 94 is the I core portion of the read / write core and the I core portion of the erase core.
This is a center core that also serves as the core portion, and the other configurations are similar to those of the fifth embodiment and have the same effects as the fifth embodiment.

The center core integrated type head having no insulating layer between the center cores has a small magnetic resistance of the center core,
The read / write head has the advantage of high reproduction efficiency. For erase crosstalk in which the magnetic flux picked up in the erase gap, which is a problem in the head of this structure, flows back to the read / write core, a head structure that makes the magnetic resistance of the erase core and the magnetic resistance of the center core almost the same is adopted. As a result, this crosstalk can be suppressed.

Embodiment 7 FIG. 39 shows the structure of a composite magnetic head device according to Embodiment 7. In this embodiment, the composite magnetic head device 95 is slightly different from that of FIG. 21, and the track widths of the C core portions 50a and 51a are mutually different. Different to The line connecting the midpoints of the tracks is perpendicular to the lines of the gaps 56 and 93. Other configurations are similar to those in FIG.

Next, the apparatus shown in FIG.
The operation when used as a large-capacity FDD head having a backward compatible function described in JP-A-3-103408 will be described. In this case, one of the twin structure heads is set as a lower head having the same track width as the conventional track widths of 1, 2, and 4 MB, and the other head is a high-density head for a higher head having a narrow track width. Further, an erasing head 83 having a track width about twice that of the lower magnetic head is provided in front of the lower magnetic head, and the track positioning operation uses the conventional sector servo system.

When used as the head of this recording system, as in the case of using as the head of the above-mentioned two-division recording system, crosstalk at the time of recording and reproduction between both heads (crosstalk at recording is one head. Of the magnetic flux reproduced in the gap of the other head when excited, the leakage interlinkage amount of the magnetic flux reproduced by the other head to the coil of one head and the magnetic flux reproduced by the one head to the coil of one head Suppression of the ratio of the amount of interlinkage) is an issue. When a medium having a large coercive force is used for the magnetic disk, it is not possible to sufficiently record with a slight leakage flux, so that reduction of crosstalk in the reproducing system rather than in the recording system becomes a major problem.

The third embodiment employs a similar optimum head structure for reducing crosstalk as in the first embodiment. In Example 3, since the I core has a small insulating layer thickness, the effect of reducing crosstalk cannot be expected so much that the I core has an integrated structure from the viewpoint of improving productivity. The structure is made thinner to shorten the length of the insulating layer. Specifically, the insulating layer is formed as a thin film to have a thickness of 5 μm or less, and the product of the track width of the head on one side (the narrower track width when the head track width is different) and the thickness of the non-magnetic insulating layer is the gap length. The value divided by the product of the lengths of the non-magnetic insulating layer portions is set to 10 or more. For example, as shown in FIG. 22, the sum of the track widths of the two heads is 115 μm and the gap length is 0.5 μm.
m, the thickness of the insulating layer 59 is 2 μm, and the length of the insulating layer is 8 μm
m and the magnetic permeability of the head core material is 5000, the crosstalk is -2 as shown in the calculation result of FIG. 43 described later.
It can be 4 dB.

A double azimuth head for recording / reproducing an image of a VTR, which uses two types of heads having two different track widths, which are individually prepared for recording / reproducing for a long time (EP mode) and a short time (SP mode). The method was expensive, and the relative positioning of the two heads was difficult,
The twin structure magnetic head is inexpensive and does not require relative positioning of the heads. When used as a VTR head, the track width of one of the magnetic heads is set to the track width for a long time, and the sum of the track widths of both magnetic heads is set to a wide track width for a short time. During recording, one head is used, and the coil of the other magnetic head is short-circuited to prevent crosstalk. When recording for a short time, the coils of two heads are connected in series and used as one head.

Embodiment 8 FIG. 40 shows the structure of a composite magnetic head device according to Embodiment 8. The center serves as the I core portion 52 of the composite magnetic head device 95 and the I core portion 85 of the erase head 83 shown in FIG. The core 94 is provided, and the other configurations are similar to those of the seventh embodiment. With such a configuration, the structure can be simplified.

The relation with the electromagnetic performance when the center core is shared is the same as that described in the sixth embodiment.

Embodiment 9 FIG. 41 shows the structure of a composite magnetic head device according to Embodiment 9, in which the composite magnetic head device 78 and the tunnel erase type erasing head 96 shown in FIG. The core parts 52 and 98 are connected via the magnetic insulator 84, and the back cores 53 and 54 and the back cores 99 and 100 are connected via the magnetic insulator 86, and the effect is the same as that of the above embodiment. Is.

Note that Mn-Zn ferrite, Ni-Zn
In a twin head using a metal oxide such as ferrite, Co-
Nb-Zr amorphous alloy and sendust (Fe-Si
The present invention also includes a so-called MIG (metal in gap) type twin structure head having excellent recording performance for a high coercive force medium in which a metal magnetic material having a saturation magnetic flux density higher than that of ferrite such as -Al) is formed. However, it is not preferable to form the magnetic film on the C core portion before forming the gap material because the two core portions are magnetically short-circuited via the magnetic film.

Embodiment 10 FIG. 52 is a perspective view of a triple structure composite magnetic head device according to the present invention.

In the figure, 111, 112, and 113 are single-crystal or polycrystal high-permeability metal oxides such as Mn-Zn and Ni-Zn ferrite, and sendust (Fe-A).
The C core portion of the R / W core constituting the triple core made of a metal magnetic material represented by 1-Si alloy), 121 is 11
1, I, 132 and 133, which are magnetically integrated R / W cores made of the same members as 1, 112 and 113, 131, 132 and 133
Is a back core for magnetically shunting the C core portion and the I core portion of the R / W core made of the same member as the R / W core, and 141, 142, 143, 144 are 500 to 100.
Glass, 151, 152, filled at a working temperature of 0 ° C.
Reference numeral 153 denotes an R / W gap made of SiO ₂ , Al ₂ O ₃ or the like, which is formed into a thin film by sputtering or vapor deposition, and 1
61 and 162 are insulating layers for magnetically separating each C core portion of the triple core made of the same member as 151, 152 and 153, and illustration of the R / W coil wound around each C core leg is omitted. Has been done.

The composite magnetic head of this embodiment is disclosed in
Floppy disk drive (FD) with high track density and tracking servo technology by the new data positioning method described in No. -15520.
D) or a magnetic disk device suitable for a fixed disk device (HDD).

That is, when recording and reproducing data information on a magnetic medium, three magnetic heads having a triple structure in which coils are individually wound are used as independent heads, and three parallel data pieces are arranged. -Record information separately on tracks.

On the other hand, the head positioning operation using tracking servo is performed by two magnetic heads on both sides of the three magnetic heads of triple structure. At this time, only data information is recorded on the central track, but information for signal comparison for track servo is recorded inline on a part of the two data tracks on both sides.

At this time, in order to perform the head positioning operation with high accuracy, it is necessary that both heads have the same recording / reproducing performance. 1/10 of track width of one head
In order to realize the off-track performance of, the sensitivity ratio of both heads must be 0.9 or more. To this end, the gap length (head term for gap width) Gl (see FIG. 67), gap depth Gd (see FIG. 66), and track width Tw (see FIG. 67) are set to several percent or less. There is a need.

As shown in the recording magnetization pattern according to the present invention shown in FIG. 51 (B), in order to realize recording with a high track density, three magnetic heads having very small intervals between heads form three tracks. When recording different types of information, suppression of crosstalk due to leakage flux between heads is a major issue. In order to solve this problem, the head according to the present invention has no merit from the viewpoint of reducing crosstalk. Therefore, the I core is integrally formed from the viewpoint of improving productivity, while the C core has each C core. The insulating layer between the halves is made thinner and the length of the insulating layer is shortened. Specifically, by forming a thin insulating layer, 5
.mu.m or less, and the product of the track width of the head on one side of two adjacent magnetic heads and the thickness Tt of the non-magnetic insulating layer is the gap length and the length (cutting depth) T of the non-magnetic insulating layer portion.
The value divided by the product of l is configured to be 10 or more. By adopting such a configuration, the crosstalk on the vertical axis is the value obtained by dividing the leakage magnetic flux by the main magnetic flux, and the value on the horizontal axis is the gap between the product of the track width of one head and the thickness of the insulating layer. (The value obtained by dividing the product of the length and the length of the insulating layer), the leakage magnetic flux can be suppressed to 10% or less. For example, as shown in FIG. 67, the sum of track widths of three heads is 115 μm.
m, the gap length is 0.4 μm, the thickness of the insulating layer is 2 μm,
The length of the insulating layer is 8 μm, and the magnetic permeability of the head core material is 500.
When it is 0, as shown in the calculation result of FIG. 43, the crosstalk can be set to −23 dB.

Next, a characteristic manufacturing method of the composite magnetic head according to the first embodiment of the present invention will be described with reference to FIGS.

53 and 54 are single crystal or polycrystalline Mn finished to a required size by grinding, lapping or the like.
-Ferrite piece 111 or 113 and ferrite piece 11 used for processing a C core made of Zn ferrite
It is 2.

FIG. 55 shows a step of forming the C core separation groove 171 and the glass insertion grooves 172 and 173 in the ferrite piece 111.

FIG. 56 shows the high melting point glass 14 in the C core separation groove.
1 shows a step of molding No. 1 to remove surplus glass, and flattening the surface of the mold glass.

FIG. 57 shows a step of forming a non-magnetic insulating film for preventing magnetic crosstalk between C cores on the mold glass surface.

In FIG. 58, a plurality of C cores and I core blocks produced in the previous step are combined as shown in the figure, and a load is applied in the direction of the arrow. A process of using glass rods 143 and 144 to raise the temperature and integrally weld all C cores and I cores is shown.

In the subsequent steps, in order to simplify drawing, I
A process using only blocks is shown.

FIG. 59 shows a processing step in which each C core of the triple core is separated and U grooves 174 and 175 for inserting the R / W coil are provided.

FIG. 60 shows the apex V groove 17 which defines the gap depth (Gd shown in FIG. 66) of the triple core head.
6 Grooves 177, 17 for controlling processing and track width
The process of applying 8 is shown.

After this processing is completed, although not shown in the figure, a gap material is formed on the operation gap surface.

FIG. 61 shows a ferrite piece 120 used for I-core processing, which is made of single-crystal or polycrystalline Mn-Zn ferrite finished to a required size by grinding or lapping.

FIG. 62 shows a ferrite piece 12 for I core.
Groove 17 for molding glass by grinding 0
A process of applying 9, 180 is shown. After this processing is completed, although not shown in the figure, a gap material is formed on the working gap surface.

In FIG. 63, the core shown in FIG. 60 and the core shown in FIG. 62 are united as shown in the figure, and in the state where a load is applied in the direction of the arrow, 179 and 180 are molded and both cores are integrally welded. The process is shown.

FIG. 64 shows a step of performing U-groove grinding along the dashed-dotted line A and cutting along the dashed-dotted line B shown in FIG.

FIG. 65 shows a step of attaching back bars 131, 132, 133 for shunts to the core shown in FIG.

[Embodiment 11] In addition, although the structure having no erasing head has been described in the above embodiment, the C core portion of the erasing head shown in FIG. A triple structure head with an erasing head provided on the side is also included in the present invention. The I core leg of this head uses both R / W core and E core I core legs together. Of the reference numerals in FIG.
The same parts as those shown in FIG. Therefore, only the coded parts not shown in FIG. 52 will be described here. 145 and 146 are the same filled glass as 141 to 144, 154 is an erase (E) gap made of the same member as 151 to 153, 170 is 111 to 113, 1
20 is an E-core C-core leg made of the same material as 20.

By using this head, it is possible to open
Current model of loop system (1, 2 and 4 megabytes of each FD
The large-capacity FDD described in the tenth embodiment having the compatibility function of reading and writing various floppy disks used in D) can be realized. When used as a backward compatible machine, the recording track width of each lower machine is the same, so the sum of the track widths of three heads with the same track width is adjusted to the lower machine, and the gap length is adjusted to that of the 4MB machine. , The coils of each head are connected in series, and the triple structure head is used as one integrated head (the 4 MB machine has a backward compatibility function with the 1/2 MB machine). The width is set to about twice the sum of the track widths of the three R / W heads.

Embodiment 12 FIG. 69 is a perspective view showing the structure of an embodiment of the present invention. In FIG. 69, 201 and 202 are metal multi-layer magnetic films with high magnetic permeability, which are represented by Sendust (Fe-Al-Si alloy) and Co-Zr-Nb-based amorphous alloy, which form the C core leg.

Reference numerals 203 and 204 respectively denote I core leg portions, which are metal multi-layer magnetic films made of the same material as the C core leg portions.

205 and 206 are represented by Mn-Zn ferrite for magnetically shunting the C core leg and the I core leg after inserting the R / W coil (not shown) in the C core leg. It is a back bar made of a magnetic material with high magnetic permeability.

207, 208 and 212 are twin core C
It is a glass that is molded in the process of integrating the core leg and the I core leg with the gap material interposed therebetween. Glasses 210 and 211 are molded between both cores made of the metal multilayer magnetic films of the C core leg and the I core leg, respectively.

Reference numerals 213 and 214 are R / W gaps of a twin core head made of a non-magnetic insulating film such as SiO ₂ or Al ₂ O ₃ .

Reference numeral 215 is an insulating spacer made of SiO ₂ or the like for magnetically separating the two heads of the twin core head.

Further, 216, 217, 218, 220
Is a ceramic substrate represented by calcium titanate or the like in which a metal multilayer magnetic film is formed into a thin film by sputtering or the like.

(A) By the way, JP-A-50-15520
Large-capacity FDD and H using the tracking servo technology by the new data positioning method described in No.
When the magnetic head device of the present invention is used as a magnetic head having a new structure suitable for DD, it operates as described below.

When recording and reproducing data information on a magnetic medium, two recording / reproducing coils of a twin core head having the same track width are connected in series to operate as one magnetic head.

Therefore, the recorded data area is the sum of the track widths of both heads.

On the other hand, when the tracking servo is applied to position the heads, both heads are used as independent reproducing heads, and the magnitudes of the reproduced signals of the data tracks by both heads are compared to determine that the signal levels are at the same position. Position and operate the head.

At this time, in order to perform the head positioning operation with high accuracy, it is desirable that both heads have the same recording and reproducing performance.

In order to realize the off-track performance of 1/10 of the recording track width of one head, the sensitivity ratio of both heads must be 0.9 or less.

For this purpose, it is necessary to arrange the R / W gap length, the track width, and the dimensions of each part of the head, and to suppress the difference within several percent. As is apparent from the method of manufacturing the magnetic head of the present invention, which will be described in detail later, this is a numerical value that can be easily realized.

If such a tracking servo system is adopted, the above-mentioned book "All About Floppy Disk Devices"
Compared with the conventional sector servo system in which a servo data area is specially provided in a part of the data area of the recording track described in, the amount of data recording can be improved, the peripheral circuit can be simplified, and the cost of the device can be reduced. realizable.

Further, as compared with ferrite which is widely used as a head member at present, high frequency magnetic characteristics (10 MH)
z) or more) and the saturation magnetic flux density is twice or more the metal multi-layer magnetic film is used, so that it can be used at a higher frequency than the current magnetic recording device, and a further large capacity magnetic recording device can be realized. .

(B) Next, it has a compatibility function (a function capable of reading and writing on the existing floppy disk) with the current machine of 3.5 inch of the loop loop system {1, 2, 4 MB (megabyte)}, and In order to realize the large-capacity FDD of the magnetic recording method described in (A), the twin-core head shown in FIG. 69 and the composite head of the 4 MB pre-erasing method used in the current model are provided in one head lider at a required interval. Therefore, the composite magnetic head device shown in FIG. 73 arranged in parallel can be used.

Further, although not shown, a composite magnetic head device in which the composite head of the tunnel erasing method shown in FIG. 17, which is adopted in a 1 and 2 MB machine as a low density specification head, is arranged in parallel with a twin head, is also provided. Included in this invention.

In the current model of the open loop system, in order to guarantee the compatibility function between the models having different capacities, the track density is the same and the linear recording density is different.

From the viewpoint of ensuring compatibility, in order to realize a high track density and high linear density FDD, a composite magnetic head having such a structure is devised.

In these magnetic recording methods, a head of a tunnel erase method or a preceding erasing method is obviously used for recording of low density specifications, and a twin structure head is used for recording of high density specifications.

(C) Specially manufactured current R / W head with preceding erase head or R with tunnel erase head
71 and FIG. 7 in which the preceding erasing head or tunnel erasing head is integrally arranged in front of or behind the twin core head instead of arranging the / W head in parallel with the twin core head in the present invention at a required interval.
By using the composite magnetic head shown in FIG. 2, it is possible to realize a large-capacity FDD having a completely backward compatible function with the current model.

In this regard, two types of composite heads, which are characterized by setting the dimension of the track width described below, are conceivable.

(A) In the first composite head, one track width of the twin core is set to the track width of the current model 1, 2, 4 MB machine, and the other track width is set to the track width of the head of high density specification. Set.

FIG. 7 shows a compatible machine with the 1 and 2 MB machines.
A composite head in which a tunnel erasing head is integrally arranged behind the lower head shown in 2 is used.

Regarding compatible machines with 1, 2, and 4 MB machines,
A composite head in which an erasing head is integrally arranged in front of the lower head shown in FIG. 71 is used.

The track width of the lower head and the relative position of the tracks are matched with those of the existing machine. Then, a composite head system including an R / W head having a wide track width and the erasing head, which is the other of the twin core heads, is used for recording of the current low density specifications. Tracking servo during high density recording is based on the current sector servo system.

(B) In the second composite head, one track width of the twin core is set to the track width of the high-density specification head, and the sum of this track width and the other track width is the current model 1, 2 Set to track width of 4MB machine.

At the time of high-density recording, a twin head of two twin core heads is used as a composite head system in which a preceding erasing head or a tunnel erasing head is integrally arranged in front of or behind one twin core head set to a track width of high density specifications. The head is integrally operated as one R / W head.

Tracking servo during high density recording is based on the current sector servo system. If the specification of the track width is set in this way, it can be replaced with a composite head of a double azimuth type used in a VTR, which has a head for short time recording with wide track width and a head for long time recording with narrow track width. .

That is, for short-time recording, the twin head is operated as one head, and for long-time recording, the head having the narrower track width is used.

In the current double azimuth type head, it is necessary to manufacture two heads individually, and it is difficult to align the two heads, but the twin core head solves such a problem.

Example 13 Next, a characteristic manufacturing method of the composite magnetic head of Example 1 will be described with reference to FIGS.

First, as shown in FIG. 74, a ceramic piece substrate 2 typified by, for example, calcium titanate, which is finished to a required size by grinding, lapping, or the like.
00 is prepared.

Next, as shown in FIG. 75, a separation groove 235 provided between the twin cores is provided in the ceramic piece substrate 200 by grinding using a diamond wheel.

Next, as shown in FIG. 76, the separation groove 235 is formed.
Using thin film forming technology such as sputtering, SiO ₂
Multilayer magnetic films 237 and 238 of sendust and amorphous alloy having high saturation magnetic flux density and high magnetic permeability are formed through the non-conductive insulating film 236 such as.

Next, as shown in FIG. 77, the multilayer magnetic film 2
Glass 240 on the separation groove 235 formed by 37 and 238.
To mold. The surplus molded glass is removed by lapping. That is, the glass 240 is left only on the separation groove 235.

Next, as shown in FIG. 78, in order to magnetically separate the two twin cores, an insulating film 242 such as SiO _{2 is} formed into a thin film by sputtering or the like.

Next, as shown in FIG. 79, both twin cores are combined. In this case, the upper twin-core insulating film 2
The upper twin core is placed on the lower twin core so that the front and back sides of the upper twin core are opposite to each other so that 42 and the lower twin core insulating film 242 are bonded to each other.

Next, in FIG. 79, arrows A1, A
A twin core block is formed by applying loads in two directions and integrally welding.

Next, as shown in FIG. 80, the twin core block produced by the above-mentioned integral welding was used for the C core leg portion 24.
1 and I core leg 242 are cut to separate them.

After this cutting process, as shown in FIG.
Glass grooves 243 and 244 for filling glass are formed in each block of the C core leg 241 and the I core leg 242. For the block of the I core leg 242,
A gap material (not shown) such as SiO ₂ is formed on the surface of the arrow A3.

Next, as shown in FIG. 82, the glass groove 24
A “U” -shaped groove 245 is formed in the block of the C core leg 241 which has been machined in 3, 244 by grinding in the direction of arrow A4.

Next, as shown in FIG. 83, the U-shaped groove 2
The “L” -shaped groove 246 is provided by grinding in the block of the C core leg 241 after the processing of 45.

Next, after forming the "L" -shaped groove 246, as shown in FIG. 84, the block of the C core leg portion 241 is subjected to taper grinding to form a taper portion 247, and then, A gap material (not shown) such as SiO ₂ is formed on the surface of arrow A5. As a result, the gap material is formed in both the C core leg 241 block and the I core leg 242 block.

After the above processing is completed, as shown in FIG. 85, the block of the C core leg 241 and the I core leg 2 are formed.
The blocks of 42 are united, a load is applied in the directions of arrows A6 and A7, the temperature is raised by using the glass rod 248, and the glass rod 248 is melted, and the C core leg 24
1 and I core leg 242 are integrally welded.

The twin core block integrally welded is lapped up to the surfaces indicated by broken lines 250 and 251, and then two coils (not shown) are wound around it.
By connecting to the two backbar rear parts, FIG.
The twin core head is completed as shown in. Reference numerals 266 and 267 in FIG. 92 denote back bars.

Embodiment 14 FIGS. 87 to 91 are process explanatory diagrams of a method of manufacturing the composite magnetic head of the embodiment shown in FIG. 70 (second embodiment of the manufacturing method).

First, as shown in FIG. 87, a separation groove 253 between twin core C cores is formed in a ceramic substrate by grinding.

Then, after finishing the processing of the separation groove 253,
As shown in FIG. 88, thin metal multilayer magnetic films 254 to 256 are formed on the ceramic substrate 252 by sputtering or the like to form a twin core block 257.

As described above, the metal multilayer magnetic thin films 254 to
After the formation of 256, next, as shown in FIG. 89, Si is formed on the terraces of these metal multilayer magnetic films 254 to 256.
A non-magnetic spacer 258 such as O ₂ or Al is formed by sputtering, vapor deposition, ion plating or the like to form a twin core block 260.

Next, as shown in FIG. 90, one twin core block shown in FIG. 88 and the other twin core block shown in FIG. 89 in which the non-magnetic spacer 258 is formed into a thin film are combined to form arrows A8 and A9. While applying a load in the direction of, and increasing the temperature, the glass square bar 261 is used to integrally weld.

After that, the twin core head shown in FIG. 92 is obtained by performing the processing of the steps after FIG. 81 described in the first manufacturing method of the thirteenth embodiment.

Fifteenth Embodiment FIG. 91 is a process explanatory view of an embodiment for further improving mass productivity. A plurality of twin core blocks 263 to 265 (three in the illustrated case) are formed by using a round glass rod 262. You can also get

Embodiment 16 Further, FIG. 93 shows an I core leg portion 24 made of a ferrite member.
FIG. 82 is a process explanatory view of forming the glass grooves 243 and 244 in FIG. 2, whereas the member of the I core leg portion 242 shown in FIG. 81 is ceramic, whereas this Example 16 shows a case of using a magnetic material. ing.

Further, FIG. 94 is a perspective view showing a completed example of a twin core head in which the twin core I core leg portion 242 is made of a ferrite member.

Example 17 In the above example, the twin core head in which both the C core leg 241 and the I core leg 242 are composed of the metal multilayer magnetic films 254 to 256 has been described. 13th embodiment), the I core leg portion 201 has a magnetically separated monolithic structure, and the core member is made of a metal oxide such as Mn—Zn ferrite or Ni.
The twin head composed of -Zn ferrite is also shown in FIG.
The same effect as that of the above embodiment is obtained.

The twelfth embodiment of FIG. 69 except that the I core leg 209 in FIG. 70 is made of ferrite.
The same parts as those in FIG. 69 are given only the same reference numerals and will not be described again.

When the composite magnetic head shown in FIG. 70 is used as an R / W head as shown in application examples to various high recording density devices, the main part of the core is composed of a metallic film having a high saturation magnetic flux density. The C-core leg is placed on the outflow side of the medium.

The reason for this is that the strength of the magnetization recorded on the medium is determined by the strength of the magnetic field at the trailing edge of the gap (outflow end of the medium).

Example 18 In addition, Example 12 of FIG. 69 and Example 1 of FIG.
Although the twin core head having no erasing head has been described in No. 7, in the eighteenth embodiment of FIG. 71, the erasing head is provided adjacent to the I core leg portion of the twin core head and further sharing the I core leg portion with the twin core head. As described above, this composite magnetic head can realize a large-capacity magnetic recording device having some characteristics.

Mold glasses 221 and 223 in FIG. 3 are for controlling the track width of the erasing head and for integrating the I core leg and the C core leg of the erasing head.
Reference numeral 222 denotes an erase gap made of the same material as shown in FIG. 69, and 224 denotes a C core leg portion of the erase head made of the same member as the I core leg portion 209 shown in FIG.

In the eighteenth embodiment shown in FIG. 71, a structure in which the twin core R / W head and the I core leg of the erase head are shared is shown, but it is not shown in order to reduce crosstalk between both heads. However, the present invention also includes a magnetic head having a magnetic insulating spacer provided in the center of the I-core leg.

Embodiment 19 A composite magnetic head in which a tunnel erasing head is integrally arranged behind a twin core head with a preceding erasing head via a magnetic insulating spacer, in addition to the twin core head shown in Embodiment 18 of FIG. By applying the above, as described in the section of the operation of the twelfth embodiment, a large-capacity magnetic recording device having some characteristics can be prepared, which is included in the present invention.

In FIG. 72, 221, 223, 2
Numeral 26 is a mold glass for regulating the track width of the erasing head and for integrating the C core leg portion and the I core leg portion, 2
Reference numerals 25 and 227 denote erase gaps made of the same material as the R / W gap shown in FIG. 69 for trimming erase.

209 and 224 are the I core leg and the C core leg of the tunnel erasing head made of the same material as the I core leg described in FIG.

Reference numeral 228 is a magnetic insulating spacer made of crystallized glass, ceramics or the like, which is provided to prevent crosstalk between both heads.

[Embodiment 20] A twin core head according to Embodiment 12 shown in FIG. 69 and an R / R with a preceding erasing head adopted in the current 4 MB machine.
If the composite magnetic head shown in FIG. 73 in which the W head or the R / W head with a tunnel erasing head is arranged in parallel on one slider is used, a high recording density, large capacity FDD having a completely backward compatible function with the current model is used. Can be realized.

Reference numeral 230 in FIG. 73 is a twin core head in the twelfth embodiment shown in FIG. 69, 231 is an R / W head with a preceding erasing head, and 232 to 234 are slider members.

The slider members 232 to 234 are made of calcium titanate or the like.

When used in a recording system in which two magnetic heads are used separately, crosstalk caused by leakage of magnetic flux between the heads becomes a problem. In order to solve this problem, the ratio of the leakage magnetic flux to the main magnetic flux is 0.1 (−20d) in this head.
B) In order to achieve the following, the product of the track width (narrow track width when the track widths are different) of one of the adjacent heads and the thickness of the non-magnetic layer is the product of the gap length and the length of the non-magnetic insulating layer. A structure in which the value divided by is 10 or more is adopted. For example, as shown in the embodiment of FIG. 95, when the track width is 57 μm, the insulating layer thickness is 2 μm, the insulating layer length (cutting depth) is 8 μm, and the magnetic permeability of the head core material is 5000 or more, a crosstalk of −20 dB or less is obtained. . In order to further reduce the crosstalk, it is preferable to use the head having the structure shown in FIG. 96 in which the cutting depth is close to zero.

Embodiment 21 FIG. 97 is a perspective view of a composite magnetic head having a triple structure in which the main core portion according to the present invention is made of a metal magnetic multilayer film.

In the figure, 301 to 303 are made of sendust alloy (Fe-Si-Al), amorphous alloy (Co-Zr-Nb) or the like, respectively, and are formed into multiple layers (three layers in the figure) through a non-magnetic insulating film. The formed C core magnetic body portion 321 made of a metal magnetic body having high magnetic permeability and high saturation magnetic flux density,
Reference numeral 323 denotes an I core magnetic body portion made of the same member as 301 to 303, and 331 to 333 a magnetic member made of the same member as 301 to 303 or a C core portion and an I core portion made of metal oxide such as Mn-Zn ferrite. back bar to shunt, the filled glass 341-347 is represented by a glass of lead-based, 351 to 353 are read-write made of SiO _2, Al ₂ O ₃ which is a thin film formed by sputtering, vapor deposition, or the like ( R / W) gap, 361, 362
Is formed between the three magnetic heads by the same method as the R / W gap and is made of the same member as the magnetic insulating layers 311 and 312 are C core portions of both side heads of the triple structure composite head. 324, 325 are ceramic members made of calcium titanate, barium titanate, etc., which are constituent members of the I core portion. Note that the R / W coil wound around the C core leg of each head is omitted in FIG.

The head positioning operation using the tracking servo technique uses two magnetic heads located on both sides of the three magnetic heads of the triple structure and compares reproduced signals of data tracks by both heads. , Move the head to a position where the signal levels of both heads are the same,
Perform on-track operation.

At this time, only the data information is recorded on the central track, but the information for reproducing signal comparison for tracking servo is recorded inline on a part of the two data tracks on both sides. When recording and reproducing data on / from a magnetic medium, three magnetic heads of triple structure in which R / W coils are individually wound are used as independent heads, and information is recorded on three parallel data tracks. Split and record / playback. At this time, if there is crosstalk (magnetic interference due to a leakage magnetic flux between heads), a read error occurs, which is not preferable. Therefore, in the head according to the present invention, the track width of one of the three heads (a narrow track width when the track widths are different)
And the value obtained by dividing the product of the thickness of the non-magnetic insulating layer by the product of the gap length and the length of the insulating layer is 10 or more. When the magnetic permeability of the head core is 5000 or more, crosstalk of -20 dB or less is obtained.

Next, a characteristic manufacturing method of the composite magnetic head according to Embodiment 21 of the present invention will be described with reference to FIGS.
A description will be given using 115.

FIG. 98 shows a ceramic piece made of calcium titanate, barium titanate or the like, which is finished to a required size by grinding, lapping or the like.

FIG. 99 shows a processing step for forming a separation groove between adjacent heads by grinding on the ceramic piece shown in the previous figure.

FIG. 100 shows that Mn-is formed on a ceramic piece having a separation groove by a thin film forming technique such as sputtering.
A process for forming a metal magnetic multilayer film which is superior to Zn ferrite in high frequency magnetic characteristics and has a high saturation magnetic flux density will be described.

FIG. 101 shows a step of molding glass in the separation groove formed with the metal magnetic multilayer film and removing the excess glass by lapping.

FIG. 102 shows a step of forming a non-magnetic film as a magnetic insulating layer for the adjacent head on the glass-molded piece.

FIG. 103 shows a step in which a metal magnetic multilayer film is further formed on the surface on which the non-magnetic film is formed, and a non-magnetic film serving as a magnetic insulating layer with the adjacent head is further formed on the magnetic film.

FIG. 104 shows a process in which the pieces shown in FIGS. 101 and 103 are united as shown in the figure, the temperature is raised to melt the glass, and the two pieces are integrated.

FIG. 105 shows a step of cutting the block integrally fused in the above step along the broken line A shown in FIG. 104, and then subjecting the cut blocks to the glass filling groove processing shown at 345 and 346. .

FIG. 106 is a perspective view of the block shown in FIG. 105 seen from another angle.

FIG. 107 shows a step of processing the grooves 371 and 372 for inserting the R / W coil subsequent to the previous step.

FIG. 108 is a perspective view of the block shown in FIG. 107 seen from another angle.

FIG. 109 shows a step of processing the V groove 380 for inserting the glass rod in the processing block shown in FIG.

FIG. 110 shows a step of combining the processing block shown in FIG. 107 and the processing block shown in FIG. 109 as shown.

In FIG. 111, a load is applied to the united block in the direction of the arrow and a glass rod 381 is used to raise the temperature,
Weld both together.

FIG. 112 shows a step of forming a groove 390 for inserting the R / W coil along the alternate long and short dash line B shown in FIG. Next, R / W coil (not shown)
The step of attaching back bars 331, 332, 333 for magnetically shunting the I-core leg and the C-core leg after inserting is shown.

Through the above steps, the magnetic head shown in Embodiment 21 is obtained.

FIG. 113 shows a core piece made of a metal oxide processed into a predetermined size, represented by Mn-Zn ferrite, which serves as an I core leg of the composite magnetic head according to the twenty-second embodiment shown in FIG.

FIG. 114 shows a step of processing the grooves 345 and 346 for filling the above-mentioned ferrite piece with glass.

In FIG. 115, the core block shown in the previous figure and the core block shown in FIG.
FIG. 23 is a perspective view of a completed composite magnetic head according to an example 22 obtained by performing the same kind of processing as that shown in FIG.

Embodiment 22 In the above embodiment, the main core portion of both the I core and the C core is made of a metal magnetic multilayer film.
As shown in FIG. 116, the present invention also includes a case where a metal oxide ferrite is used for the I core portion 300 and the I core portion is integrated.

In this case, since the recording efficiency depends on the magnitude of the magnetic field in the head gap portion on the medium outflow side, the C core portion composed of the metal magnetic multilayer film having a high saturation magnetic flux density is arranged on the medium outflow side. .

Embodiment 23 In the above Embodiments 21 and 22, only the R / W head is shown. However, as shown in FIG.
The present invention also includes a triple structure composite head with an erasing head shown in FIG. 117, which is provided with an erasing core 391 having a track width approximately twice the sum of the track widths of R / W heads.

In this case, the sum of the track widths of the three R / W heads is set to the head track width of the current low density 1/2/4 MB machine, and the R / W coils of each head are set in series. And the three heads are operated as one head, the function as a backward compatible machine can be provided.

[0244]

As described above, according to the first aspect of the present invention, two magnetic heads having the same read / write gap length and gap depth are arranged in parallel with each other via a non-magnetic material.
Since the gap between the C cores of individual magnetic heads is made small and the magnetic resistance is made large, and the twin structure in which each gap of the magnetic heads is arranged inline, high density recording is possible and production is easy. Can be Therefore, a high-performance floppy disk device having a high linear recording density, a magnetic disk device, and the like using the tracking servo technique can be realized at low cost.

Further, according to claim 2, since the C core portions of the two magnetic heads have the twin structure with the nonmagnetic material interposed therebetween,
A high-performance floppy disk device having a high linear recording density and a high track density using the tracking servo technology can be realized at a lower cost.

According to the third aspect, since the non-magnetic material between the magnetic heads is made of glass and a conductive metal, the conductive metal causes an eddy current reaction to prevent crosstalk between the magnetic heads. it can.

According to the fourth aspect, since one magnetic head is a lower head and the other magnetic head is an upper head, a high-performance and large-capacity floppy disk device having a backward compatibility function can be obtained.

According to the fifth aspect, at the time of recording / reproducing, two coils are connected in series to use two magnetic heads as one integrally formed magnetic head, and at the time of tracking servo, data of the two magnetic heads is used. Since the reproduced signal is independently used as the comparison signal, tracking servo can be performed using the servo signal recorded in the data track area of the magnetic recording medium.

According to the sixth aspect, only the track of one magnetic head is used at the time of high-density recording / reproducing, and at this time, the coil of the other magnetic head is short-circuited to prevent crosstalk.

According to the seventh aspect, the tracks of each magnetic head are used during recording, and two magnetic heads are used as one magnetic head during reproduction. Therefore, recording with higher linear density is possible. It is possible to realize a floppy disk device having a large capacity.

According to the eighth or ninth aspect, since the erasing head is provided in front of the twin-structure magnetic head, the preceding erasing is possible, the medium with the poor overwrite performance can be recorded, and the backward compatibility function is also provided. It is possible to realize a large-capacity floppy disk device and the like.

According to the tenth aspect, since the tunnel erase or the preceding erasing head is provided in parallel with both the magnetic heads with a space therebetween, the magnetic head has a compatibility function with the conventional machine and
A large-capacity floppy disk device or the like can be realized.

According to the eleventh and twelfth aspects, since the twin structure composite magnetic head is integrally formed by the glass bonding technique or the like, a highly accurate and high performance composite magnetic head device can be manufactured at low cost.

According to the thirteenth to sixteenth aspects, since the triple structure composite magnetic head device by the integral forming method using the glass bonding technique is adopted, the head device itself can be manufactured at low cost. , High-performance FDD and HDD with high track density using tracking servo technology can be realized at low cost, and high-performance large-capacity FDD with backward compatibility with the current FDD
Can be realized at low cost.

According to the seventeenth aspect, the read / write gap length and the gap depth are equal to each other, the gaps are arranged in-line, and the main core portion is composed of two magnetic heads formed of a metal multilayer magnetic film. The I-core leg and the C-core leg that form each core half pair of both magnetic heads are symmetrically arranged with respect to the boundary line of the two magnetic heads, and the read / write coil is wound around the C-core leg. By wearing
It can be applied to a magnetic recording / reproducing apparatus having an excellent S / N ratio suitable for high-density recording on a high coercive force metal medium and high-frequency recording with a high transfer rate.

According to the eighteenth aspect, the two magnetic heads have the same track width, and the two magnetic heads are symmetrical in shape with respect to the non-magnetic layer separating the half pairs of the C core legs of both the magnetic heads. By setting the number of turns of the coil to be the same, the recorded data area becomes the sum of each track of both heads.
High-density recording is possible using a new servo system that compares the magnitudes of reproduced signals from individual magnetic heads.

According to the nineteenth aspect, the product of the track width of one of the adjacent heads (a narrow track width when the track widths are different) and the thickness of the non-magnetic layer is the gap length and the length of the non-magnetic insulating layer. By setting the value divided by the product of 10 or more, the size can be reduced and the crosstalk between both magnetic heads can be suppressed.

According to the twentieth aspect, the magnetic head having the narrower track width is independently used during the recording operation of the high density specification, and both the magnetic heads operate as one magnetic head during the recording operation of the low density specification. By doing so, it can be applied to a large capacity FDD having a completely backward compatible function with the current model.

According to the twenty-first aspect, even if the I core leg is formed of a monolithic ferrite without an isolation insulating layer, the C core leg is formed of a metal multi-layer magnetic film having high high-frequency permeability and high saturation magnetic flux density. Therefore, high-density recording and high-frequency recording can be performed on a metal medium having a high coercive force, and a magnetic recording / reproducing device having an excellent S / N ratio can be realized.

According to the twenty-second aspect, by providing the tunnel erasing head after the two twin type magnetic heads, the present invention can be applied to a high recording density magnetic recording / reproducing apparatus having a completely backward compatible function with the existing machine. .

In the twenty-third and twenty-fourth aspects, the device can be manufactured at low cost by integrally forming the head.

According to the twenty-fifth to twenty-eighth aspects, since the triple structure composite magnetic head device by the integral forming method using the glass bonding technique is adopted,
The head device itself can be provided at low cost, and a composite magnetic head device having high linear recording density and excellent high frequency characteristics compatible with a high coercive force medium can be realized, and a high track density, high performance FDD using a tracking servo technology can be realized. Further, there is an effect that the HDD can be realized at low cost, and further, the high-performance large-capacity FDD having the backward compatibility function with the current FDD can be realized at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view of a composite magnetic head device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a manufacturing process of the composite magnetic head device according to the first embodiment.

FIG. 3 is an explanatory diagram of a manufacturing process of the composite magnetic head device according to the first embodiment.

FIG. 4 is an explanatory diagram of a manufacturing process of the composite magnetic head device according to the first embodiment.

FIG. 5 is an explanatory diagram of a manufacturing process of the composite magnetic head device according to the first embodiment.

FIG. 6 is an explanatory diagram of a manufacturing process of the composite magnetic head device according to the first embodiment.

FIG. 7 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the first embodiment.

FIG. 8 is an explanatory diagram of a manufacturing process of the composite magnetic head device according to the first embodiment.

FIG. 9 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the first embodiment.

FIG. 10 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the first embodiment.

FIG. 11 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the first embodiment.

FIG. 12 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the first embodiment.

FIG. 13 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the first embodiment.

FIG. 14 is an external view of a composite magnetic head device.

15 is a cross-sectional view taken along the line YY of FIG. 14 and is an explanatory diagram of the gap depth of the magnetic head.

FIG. 16 is a perspective view of a composite magnetic head device according to a second embodiment.

FIG. 17 is a perspective view of a tunnel erase type composite magnetic head device mounted in a conventional FDD.

18 is an enlarged view of a disk contact surface of the composite magnetic head device of FIG.

19A and 19B are a plan view and a front view of a double azimuth type composite magnetic head device mounted in a conventional FDD.

20A and 20B are a plan view and a front view of a double azimuth type composite magnetic head device mounted on a conventional FDD.

FIG. 21 is a perspective view of a composite magnetic head device according to a third embodiment.

22 is a detailed view of a portion A of FIG. 21. FIG.

FIG. 23 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the third embodiment.

FIG. 24 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the third embodiment.

FIG. 25 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the third embodiment.

FIG. 26 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the third embodiment.

FIG. 27 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the third embodiment.

FIG. 28 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the third embodiment.

FIG. 29 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the third embodiment.

FIG. 30 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the third embodiment.

FIG. 31 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the third embodiment.

FIG. 32 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the third embodiment.

FIG. 33 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the third embodiment.

FIG. 34 is an explanatory diagram of the manufacturing process of the composite magnetic head device according to the third embodiment.

35 is a cross-sectional view taken along line XX of FIG. 34, which is an explanatory diagram of the gap depth of the magnetic head.

FIG. 36 is a perspective view of a composite magnetic head device according to a fourth embodiment.

FIG. 37 is a perspective view of a composite magnetic head device according to a fifth embodiment.

FIG. 38 is a perspective view of the composite magnetic head device according to the sixth embodiment.

FIG. 39 is a perspective view of a composite magnetic head device according to Example 7.

FIG. 40 is a perspective view of a composite magnetic head device according to an eighth embodiment.

FIG. 41 is a perspective view of the composite magnetic head device according to the ninth embodiment.

FIG. 42 is a result of calculating the relationship between the off-track and the reproducing sensitivity difference of the twin core head.

FIG. 43 is a result of calculating the relationship between crosstalk and core dimension of a twin core head.

FIG. 44 is an explanatory diagram of a recording magnetization pattern at the time of dual recording of a twin core head and a reproduction output waveform.

FIG. 45 is a perspective view of a twin core head (1) including a ferrite core according to a conventional technique.

FIG. 46 is a perspective view of a twin core head (2) including a ferrite core according to a conventional technique.

FIG. 47 is a perspective view of a twin core head including a metal magnetic multilayer film core according to a conventional technique.

FIG. 48 is an explanatory diagram of a recording magnetization pattern by a twin core head according to a conventional technique.

FIG. 49 is an explanatory diagram of a recording magnetization pattern by the twin core head according to the present invention.

FIG. 50 is a perspective view of a conventional triple core head including a ferrite core.

FIG. 51 is a diagram for explaining a recording magnetization pattern by a triple core head according to the related art and the present invention.

52 is a perspective view of a composite magnetic head having an inline gap triple structure according to Example 10. FIG.

FIG. 53 is an explanatory diagram of the method of manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 54 is an explanatory diagram of the method of manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 55 is an explanatory diagram of the method of manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 56 is an explanatory diagram of the method of manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 57 is an explanatory diagram of the method for manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 58 is an explanatory diagram of the method for manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 59 is an explanatory diagram of the method of manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 60 is an explanatory diagram of the method for manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 61 is an explanatory diagram showing the method of manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 62 is an explanatory diagram of the method of manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 63 is an explanatory diagram of the method for manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 64 is an explanatory diagram of the method for manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 65 is an explanatory diagram of the method of manufacturing the composite magnetic head according to the tenth embodiment.

FIG. 66 is an explanatory diagram of a gap depth Gd.

67 is an example of dimensional specifications of the magnetic head according to example 10. FIG.

FIG. 68 is a perspective view of a triple-structure composite magnetic head with a preceding erase head according to an eleventh embodiment.

FIG. 69 is a perspective view of a composite magnetic head device according to a twelfth embodiment.

70 is a perspective view of a composite magnetic head device according to Example 17. FIG.

71 is a perspective view of a composite magnetic head device according to Example 18. FIG.

72 is a perspective view of a composite magnetic head device according to Example 19. FIG.

FIG. 73 is a perspective view of the composite magnetic head device according to the twentieth embodiment.

FIG. 74 is a perspective view of a ceramic substrate applied to a method of manufacturing a composite magnetic head device according to a thirteenth embodiment.

FIG. 75 is an explanatory diagram of a process of processing the separation groove between the twin cores according to the thirteenth embodiment.

FIG. 76 is an explanatory diagram of the formation process of the metal multilayer magnetic film according to the thirteenth embodiment.

77 is an explanatory diagram of a glass mold forming step in the separation groove between the twin cores of Example 13 of the same.

78 is an explanatory diagram of an insulating film forming process of Example 13 above. FIG.

FIG. 79 is an explanatory diagram of a glass-in-one welding process for twin cores according to the thirteenth embodiment.

FIG. 80 is an explanatory diagram of a twin core cutting step for producing a C core leg portion and an I core leg portion of Example 13 above.

FIG. 81 is an explanatory diagram of a glass groove processing step of the I-core leg portion according to the thirteenth embodiment.

FIG. 82 is an explanatory diagram of a process of processing the U-shaped groove of the C core leg portion according to the thirteenth embodiment.

FIG. 83 is an explanatory diagram of a process of processing the L-shaped groove of the C core leg portion according to the thirteenth embodiment.

FIG. 84 is a process explanatory diagram of taper processing to an L-shaped groove of the C core leg portion of the above Example 13;

FIG. 85 is an explanatory diagram of an integrated glass welding process for the C core leg and the I core leg according to the thirteenth embodiment.

FIG. 86 is an explanatory diagram of a process of lapping removal processing of surplus ceramic according to the thirteenth embodiment.

FIG. 87 is an explanatory diagram of a process of processing the separation groove between the twin cores of the ceramic substrate which is applied to the method for manufacturing the composite magnetic head device according to the fourteenth embodiment.

FIG. 88 is an explanatory diagram of the forming process of the metal multilayer magnetic film of Example 14 above.

FIG. 89 is an explanatory diagram of a spacer film forming process of Example 14 of the above.

FIG. 90 is an explanatory diagram of a glass-in-one welding process for twin cores according to Example 14 of the same.

FIG. 91 is an explanatory diagram showing a glass-integrated welding step for a plurality of twin cores in the method for manufacturing the composite magnetic head device according to the fifteenth embodiment.

FIG. 92 is a perspective view showing a completed state of a twin core head manufactured by the method for manufacturing the composite magnetic head device according to the thirteenth embodiment.

FIG. 93 is an explanatory diagram of a process of processing the glass groove of the I core leg portion with ferrite in the method of manufacturing the composite magnetic head device according to the sixteenth embodiment.

FIG. 94 is a perspective view showing a completed state of a twin core head having a ferrite I core leg portion according to Example 16 above.

FIG. 95 is an enlarged view of the gap portion of the disk contacting surface in the case where there is an insulating space between the C core leg portions for explaining the magnetic resistance of the gap portion of the composite magnetic head device of the same as Example 12;

FIG. 96 is an enlarged view of the gap portion of the disk contacting surface in the case where there is no insulating spacer of the C core leg portion for explaining the magnetic resistance of the gap portion of the composite magnetic head device of the same as Example 12;

97 is a perspective view of a composite magnetic head having an inline gap triple structure according to a twenty-first embodiment. FIG.

FIG. 98 is an explanatory diagram of the method of manufacturing the composite magnetic head according to the twenty-first embodiment.

FIG. 99 is an explanatory diagram of the method for manufacturing the composite magnetic head according to the twenty-first embodiment.

FIG. 100 is an explanatory diagram of the method for manufacturing the composite magnetic head according to the twenty-first embodiment.

FIG. 101 is an explanatory diagram of the manufacturing method of the composite magnetic head according to the twenty-first embodiment.

FIG. 102 is an explanatory diagram of the manufacturing method of the composite magnetic head according to the twenty-first embodiment.

FIG. 103 is an explanatory diagram of the manufacturing method of the composite magnetic head according to the twenty-first embodiment.

FIG. 104 is an explanatory diagram of the manufacturing method of the composite magnetic head according to the twenty-first embodiment.

FIG. 105 is an explanatory diagram of the manufacturing method of the composite magnetic head according to the twenty-first embodiment.

FIG. 106 is an explanatory diagram of the manufacturing method of the composite magnetic head according to the twenty-first embodiment.

FIG. 107 is an explanatory diagram showing the method of manufacturing the composite magnetic head according to the twenty-first embodiment.

FIG. 108 is an explanatory diagram of the manufacturing method of the composite magnetic head according to the twenty-first embodiment.

FIG. 109 is an explanatory diagram of the method for manufacturing the composite magnetic head according to the twenty-first embodiment.

FIG. 110 is an explanatory diagram of the method for manufacturing the composite magnetic head according to the twenty-first embodiment.

FIG. 111 is an explanatory diagram of the manufacturing method of the composite magnetic head according to the twenty-first embodiment.

FIG. 112 is an explanatory diagram of the manufacturing method of the composite magnetic head according to the twenty-first embodiment.

FIG. 113 is an explanatory diagram showing the method of manufacturing the composite magnetic head according to the twenty-first embodiment.

FIG. 114 is an explanatory diagram of the method of manufacturing the composite magnetic head according to the twenty-first embodiment.

FIG. 115 is an explanatory diagram showing the method of manufacturing the composite magnetic head according to the twenty-first embodiment.

FIG. 116 is a perspective view of a composite magnetic head according to a twenty-second embodiment.

117 is a perspective view of a composite magnetic head having an inline gap triple structure with a preceding erase head according to a twenty-third embodiment. FIG.

[Explanation of symbols]

21 magnetic material 22,34 high melting point glass 23-25 low melting point glass 27,28,58,151-153,213,214,
351 to 353 read / write gap 29, 30, 60, 61, read / write coil 33, 62 ferrite piece 37 ferrite piece block 39 half Mn-Zn ferrite piece block pair 40 track width regulation groove 41 head chip separation preliminary groove 42, 55- 57, 141-146, 341-347
Glass 50, 50a, 51, 51a, 111, 112, 11
3, 301, 302, 303 C core part 52, 85, 120, 321, 322, 323 I core part 59, 161, 162 Insulating layer 67, 236, 242 Insulating film 201, 202, 203, 204, 237, 238 Metal Multilayer magnetic film 207, 208, 210, 211, 212, 240 Glass 209 I core leg 221, 223 Mold glass 224 C core leg 235 Separation groove

Claims (28)

[Claims] 1. A composite magnetic head device used in a magnetic recording / reproducing apparatus for recording / reproducing magnetic information to / from a data track of a magnetic recording medium, the read / write gap length and the gap depth being equal, Two magnetic heads in which a coil is wound only on a pair of C core halves are arranged in parallel and symmetrically with a non-magnetic insulating layer having a thickness of 5 μm or less formed thinly, and each gap of the magnetic heads is in-line. Further, the track width of the magnetic head is regulated by glass grooves provided in the I-core half body and the C-core half body adjacent to the non-magnetic insulating layer and the gaps. A glass groove is cut from the portion to the joint surface of the I core half body and the C core half body, and the product of the minimum track width of the heads and the thickness of the non-magnetic insulating layer is the gap length and the gap surface. Or Combined magnetic head and wherein the value obtained by dividing the product of the length of the non-magnetic insulating layer portion which is the distance to the tip of the glass grooves provided in the rear of the gap is 10 or more. 2. A composite magnetic head device used in a magnetic recording / reproducing apparatus for recording / reproducing magnetic information to / from a data track of a magnetic recording medium, the read / write gap length and the gap depth being equal. The I-core half body has an integral structure, and the C-core half body pair around which the coil is wound is arranged in parallel and symmetrically via a thin film-formed nonmagnetic insulating layer having a thickness of 5 μm or less provided between the half body pairs. Further, each gap of the magnetic head is arranged in-line, and each track width of the magnetic head is regulated by a glass groove provided in the I core half body and the C core half body adjacent to the non-magnetic insulating layer and each gap. And a glass groove cut out from the side portion of the pair of C core halves to the joint surface of the I core halves and the C core halves, and the minimum track width of the track width of each head and the thickness of the nonmagnetic insulating layer are provided. The product of Combined magnetic head device divided by the product of the length of the non-magnetic insulating layer portion which is the distance from the long and the gap surface to the tip of the glass grooves provided in the rear of the gap is equal to or is 10 or more. 3. The non-magnetic material is made of glass and conductive metal.
The composite magnetic head device according to claim 1, wherein the composite magnetic head device has a layered structure. 4. One of the magnetic heads is a lower head having a wide track width, and the other magnetic head is an upper head having a narrow track width.
7. A composite magnetic head device according to any one of items. 5. Both magnetic heads are independently wound with coils, and the coils are connected in series at the time of recording / reproducing to use two magnetic heads as one magnetic head, and at the time of track positioning, two magnetic heads are used. 4. The composite magnetic head device according to claim 1, wherein the positioning is performed by using the voltages read independently from the heads. 6. A track of one magnetic head is used at the time of recording / reproducing requiring a high density, and tracks of both magnetic heads are used at the time of recording / reproducing requiring a low density, and at the time of high-density recording / reproducing. 4. The composite magnetic head device according to claim 1, wherein the recording / reproducing coil of the other magnetic head is short-circuited during the operation of one magnetic head. 7. A track of each magnetic head is used for recording, and coils are connected in series for reproduction.
2. The number of magnetic heads is used as one, and the data transfer rate is doubled.
3. The composite magnetic head device according to any one of 3 above. 8. A composite magnetic head device according to claim 1, wherein an erasing head having a track width which is about twice the track width of one of the magnetic heads is provided in front of both of the magnetic heads. . 9. An erasing head having a track width about twice the sum of the track widths of two magnetic heads is provided in front of both magnetic heads. The composite magnetic head device described. 10. A composite magnetic head device according to claim 1, wherein a tunnel erase system or a preceding erase system composite head is arranged in parallel to both magnetic heads with a space therebetween. . 11. A ferrite piece block is formed by integrally forming a plurality of ferrite pieces having a non-magnetic film formed on one surface through the non-magnetic film by a glass bonding method. After forming the ferrite piece block pair integrally by glass bonding method, cut the necessary groove, mold the glass in this groove, and provide a coil groove in the ferrite piece block pair to wind the coil A method of manufacturing a composite magnetic head device, comprising: 12. A ferrite core piece is provided with a C core separation groove, glass is molded in the groove, and the glass mold sides of a pair of ferrite pieces are integrally united by a glass bonding method via a non-magnetic film to form a C core block. A pair is formed, each groove is provided in the C core block pair, the I core ferrite piece provided with the groove and the C core block pair are integrally combined by glass bonding, and a coil groove is provided in the C core block pair. A method of manufacturing a composite magnetic head device, comprising winding a coil in the coil groove. 13. A composite magnetic head device used in a magnetic recording / reproducing apparatus for recording / reproducing magnetic information to / from a data track of a magnetic recording medium, the read / write gap length and gap depth being equal, The C core halves of the three magnetic heads in which the coil is wound only around the C core halves are parallel to each other through the non-magnetic insulating layer having a thickness of 5 μm or less, which is a thin film, and are located at the center. Two C core halves adjacent to both sides of the core half are symmetrically arranged, each gap of the magnetic head is arranged in-line, and the track width of the central magnetic head is the nonmagnetic insulating layer. And the track widths of the magnetic heads on both sides are regulated by the magnetic insulating layer and the glass grooves formed in the I core half and the C core halves on both sides adjacent to each gap, and the side portions of the pair of C core halves are controlled. To I core half A notched glass groove is provided to the joint surface of the C core half body, and the product of the track width of one of the adjacent heads and the thickness of the non-magnetic insulating layer is the gap length, and the glass groove provided at the back of the gap from the gap surface. The composite magnetic head device is characterized in that a value obtained by dividing by the product of the length of the non-magnetic insulating layer portion, which is the distance to the tip of, is 10 or more. 14. The triple-structured three magnetic heads have the same track width, the same number of windings of the coils of the magnetic head, and the reproducing sensitivity difference between the heads is 10% or less. 13. The composite magnetic head device according to item 13. 15. A composite magnetic head device according to claim 13, wherein the magnetic head device is applied to a tracking servo type magnetic recording device which uses read voltages of two outer magnetic heads as comparison signals for head track positioning. . 16. A ferrite core forming a member of two magnetic heads located on both sides of three magnetic heads arranged in parallel via a non-magnetic insulating layer is provided with a C core separation groove. Glass is molded in the groove, and the ferrite piece, and a ferrite piece forming a member of a magnetic head located at the center of the three magnetic heads with a glass mold side of the ferrite piece via a non-magnetic film. Are integrally united by a glass bonding method to form a C core block, and grooves for restricting track widths of two magnetic heads located on both sides of the C core block are provided, and the I core ferrite provided with the grooves is provided. Peace and C
A method of manufacturing a composite magnetic head device, comprising: integrally combining a core block and a core block by glass bonding, providing a coil groove in the C core block, and winding the coil in the coil groove. 17. The I core leg and the C core leg are symmetrically arranged and are made of a metal multilayer magnetic film, and the read / write gap length and the gap depth are equal and the gap is arranged inline. Core half pairs, and read / write coils wound around the C core legs of the core half pairs to form two twin type magnetic heads with the two core half pairs. A composite magnetic head device. 18. The two magnetic heads have the same track width and are symmetrical in shape with a non-magnetic insulating layer separating the half pairs of the C core legs of the two magnetic heads as boundaries, and The number of windings of the read / write coils of the two magnetic heads is the same, and the reproduction sensitivity difference between the two magnetic heads is 10%.
18. The composite magnetic head device according to claim 17, wherein: 19. The product of the minimum track width of the track widths of adjacent heads and the thickness of the non-magnetic layer is the gap length,
A composite magnetic head device, wherein a value obtained by dividing by a product of a length of a non-magnetic insulating layer, which is a distance from a gap surface to a rear end of a glass groove, is 10 or more. 20. Of the two magnetic heads, a magnetic head having a narrower track width is used independently for a recording operation of high density specifications, and two magnetic heads are used for a recording operation of low density specifications. 18. The composite magnetic head device according to claim 17, which is used as a single magnetic head. 21. The composite magnetic head device according to claim 17, wherein the I-core leg is made of Mn—Zn ferrite or Ni—Zn ferrite having an integral structure without an isolation insulating layer. 22. The composite magnetic head device according to claim 18, wherein a tunnel erasing head is provided behind the two twin type magnetic heads. 23. A step of forming a metal multi-layer magnetic film on a ceramic piece having a separation groove formed between twin cores through a non-conductive insulating film, and a step of forming glass in the separation groove having the metal multi-layer magnetic film formed thereon. A step of forming an insulating film for magnetically separating the twin cores after molding, and a step of forming a twin core block by uniting and integrally welding both twin cores having the insulating film formed, A step of separating and cutting the twin core block into an I core leg portion and a C core leg portion to form a glass groove in each of them; Forming a gap material on the side surface of the I core block, and after forming the gap material on the surface of the I core block leg portion on the glass groove side, the gap material of the C core leg portion and the gap of the I core leg portion A method of manufacturing a composite magnetic head device, which comprises the steps of joining materials and inserting a glass rod into each of the glass grooves to integrally weld the I core leg and the C core leg. 24. A groove for separating both magnetic heads is provided on a pair of non-magnetic ceramic substrates, a metal magnetic multilayer film is formed on a surface provided with the groove, and then glass is molded in the groove to form a glass mold. The sides are joined together by glass bonding through a non-magnetic film, and the block is cut at a position midway between the portions where the metal magnetic multilayer film faces through the non-magnetic film, and cut perpendicularly to the facing surface. Body and a C core half body are prepared, a groove for winding a coil is provided on the C core half body, a glass groove for joining both core half bodies is provided, and finally both cores are integrated by glass bonding. And a method for manufacturing a composite magnetic head device. 25. The core portion of the three magnetic heads having the same read / write gap length and the same gap depth except the back bar is composed of a multilayer film made of a magnetic metal material, and the three magnetic heads are non-magnetic. Magnetically isolated through the body layer,
The gaps of the three magnetic heads are arranged in-line, the C core portion and the I core portion of the three magnetic heads are arranged on the same core half side, and the read / write coil is wound around each C core leg. A triple structure composite magnetic head. 26. The product of the minimum track width of one head and the thickness of the non-magnetic layer is the gap length, which is the distance from the gap surface to the tip of the glass groove provided behind the gap. 26. The composite magnetic head device according to claim 25, wherein a value divided by the product of the lengths of the magnetic insulating layers is 10 or more. 27. An erasing head having a track width wider than the sum of the track widths of the triple structure composite magnetic head is provided in front of the head, that is, on the medium inflow side. Composite magnetic head device. 28. After providing a groove for separating the magnetic head located at the center and the magnetic heads located on both sides in two non-magnetic ceramic pieces, a metal magnetic multilayer film is formed on the surface provided with the groove. Next, glass is molded in the groove, and then one of the two pieces having the non-magnetic film formed on the glass molding surface is further formed with a metal magnetic multilayer film on the non-magnetic film. Of the I core half body and the C core by cutting the united block by glass bonding and cutting the united block perpendicularly to the facing surface at an intermediate position of the portion where the metal magnetic multilayer film faces through the non-magnetic film. A core half body is produced, a groove for winding a coil is provided on the C core half body, a glass groove for joining both core half bodies is provided, and finally both cores are integrated by glass bonding. Do Method of manufacturing combined magnetic head device.