JPH09245449A - Magnetic field modulation head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic field modulation head which can simplify the assembling work and realize reduction of manufacturing cost by effectively absorbing and hindering vibration impact to protect head and stabilizing a spring load of the spring for supporting the head in the magnetic field modulation head supported by a spring effect. SOLUTION: In a magnetic field modulation head for magneto-optical recording in which a slider 16 is removably placed in contact with a magneto-optical disk, the rear part 16b of the slider 16 and the front part 27 of arm 26 are provided opposed with each other and first engaging means 18, 27a, 27b which allow vertical displacement and hinder horizontal forward and backward and right to left displacement are provided between the rear end part of slider 16 and front end part 27 of arm 26. Moreover, the second engaging means 23a, 27c which allow vertical displacement and hinder horizontal forward and backward and right to left displacement are provided between the front end part 27 of the arm 26 and a resin mold 23 covering the external circumference of the front end part of the flexible conductive piece 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic field modulation head for magneto-optical recording, and more particularly, it is combined with a support member composed of a leaf spring for elastically supporting the head having a coil for magnetic field modulation and a core. In this case, the present invention relates to a magnetic field modulation head capable of achieving reinforcement or stabilization against vibration and shock of the magnetic field modulation head.

[0002]

2. Description of the Related Art As a magnetic field modulation head of this type and a supporting mechanism thereof, the present applicant has previously proposed that a magnetic field modulation head for magneto-optical recording is slidably contacted with one surface of a magneto-optical disk and opposed to a laser optical pickup. In the one configured to mechanically support and electrically connect to the fixed member, the support mechanism of the magnetic field modulation head includes a slider member including a coil and a core of the magnetic field modulation head, and the slider member. A magnetic field modulation head having a structure in which a fixing member is connected to a supporting member made of a conductive spring material, the slider member and the supporting member are electrically connected to each other, and these are integrally connected. We developed a support mechanism and filed a patent application (Japanese Patent Application No. 5-140485).

However, in this type of magnetic field modulation head, since recording is performed while contacting the magneto-optical disk, a supporting mechanism for pressing the head into contact with the disk includes a single mechanism such as stainless steel or phosphor bronze. A leaf spring made of a material is used. Therefore, when the head comes into contact with the disk, vibration from the slider member is transmitted to the leaf spring, and the leaf spring vibrates to generate abnormal noise,
In addition, the disk also vibrates via the slider member, and may have various adverse effects when performing a recording operation via an optical pickup or the like.

From this point of view, the present applicant further improved the magnetic field modulation head and electrically connected both ends of the lead wire to one end of the flexible conductive piece composed of a pair of leaf springs. A coil is provided, and a slider made of a resin mold that surrounds the connection ends of the coil and the lead wire with the flexible conductive piece is provided, and a core for the coil is fitted and attached to a part of the slider. The magnetic field modulation head having the above structure was developed and a patent application was filed (Japanese Patent Application No. 6-219266).

The slider in this magnetic field modulation head is
A main body portion that surrounds the entire coil and has a core mounting hole for mounting a core, an abutting portion that slidably contacts the magneto-optical disk at its tip portion, and a connecting end portion between a lead wire and the flexible conductive piece. The flexible conductive piece is fixed to a holding member so that the tip end portion thereof holds the bending elastic force downward, and the flexible conductive piece is partially attached to the flexible member. The arm portion is provided so as to extend substantially parallel to the conductive conductive piece, and the connecting portion of the slider abuts on the tip end portion of the arm portion.

That is, in the magnetic field modulation head according to the above-mentioned proposal, as shown in FIGS. 5 to 7, the flexible conductive pieces 52, 52 having the magnetic field modulation head 40 attached to the tip end thereof extend in the longitudinal direction as they are. Then, it is embedded and fixed in the support member 50.
In this case, the flexible conductive piece 5 exposed from the support member 50
Bent portions 52b and 52b are provided in the substantially middle portions of the reference numerals 52 and 52 so that the tip portions thereof always keep downward bending elasticity, and the magnetic field modulation head 40 is attached from the bent portions 52b and 52b. A resin mold 54 is applied to integrally bond the flexible conductive pieces 52, 52 parallel to the side. The flexible conductive pieces 52, 52 embedded and fixed in the support member 50 are
The support member 50 is led out from one side to the outside, and the led out conductive pieces 52, 52 are appropriately connected to the signal line.

On the other hand, the support member 50 is provided with an arm portion 51 extending substantially parallel to the exposed portions of the flexible conductive pieces 52, 52, and each tip portion 51a of the arm portion 51 branched in two directions.
51a are sliders 4 of the magnetic field modulation head 40, respectively.
The connecting portions 46b and 46b of No. 6 are configured to face and abut in the vertical direction.

The magnetic field modulation head 40 having the above structure
Is arranged such that one end of the lift lever is appropriately brought into contact with the lower surface of the resin mold 54 of the flexible conductive pieces 52, 52 made of the leaf spring, and the magnetic field modulation head 40 is moved by the operation of the lift lever. The magnetic disk can be appropriately contacted with and separated from the magnetic disk.

6 and 7, reference numeral 42 is a coil, and 44 is core mounting holes 48a, 48b, 48.
Reference numeral 46a denotes a core mounted so as to conform to c, and 46a denotes a contact portion of the slider with respect to the magneto-optical disk.

[0010]

At present, electronic equipment to which this type of magnetic field modulation head is applied has been increasingly required to be reduced in size and cost. In the head, problems to be solved as described below are raised.

However, in the conventional magnetic field modulation head, as described above, for example, the slider 46 abutting against the magneto-optical disk is a flexible conductive piece composed of a leaf spring whose one end is fixedly supported by the supporting member 50. 52, the other end 5 of 5
2a and 52a, and a coil 42 provided on the slider 46 and a resin mold so as to surround the coupling portion of the flexible conductive pieces 52 and 52. Therefore, the slider 46 has a support member 50 at one end.
A flexible conductive piece 5 having a spring action, which is fixedly supported by
Since it is held only by the other ends 52a, 52a of the 2, 52, it has elasticity in the vertical direction (Z-axis direction), and therefore the ability to absorb vibration or shock in the vertical direction is retained.

However, since the magnetic field modulation head is not properly held in the horizontal left-right lateral direction (X-axis direction) or in the horizontal front-back direction (Y-axis direction), vibration or impact in these directions is not absorbed or absorbed. It has no stopping power.

As described above, in the conventional magnetic field modulation head, since only the Z-axis direction is dealt with as a countermeasure against vibration and shock, the length of the flexible conductive piece made of a leaf spring as a supporting member is reduced. Since the length cannot be set sufficiently long and a short conductive piece (leaf spring) is used, the degree of freedom is limited. Moreover, since the length of the conductive piece is short, there are many variations in the spring load, and it is necessary to secure a large margin. Therefore, not only is it disadvantageous in accuracy, but also the assembling work becomes finer and the manufacturing takes time, There are drawbacks such as an increase in manufacturing cost.

However, in order to support the magnetic field modulation head by a spring action in order to effectively absorb or prevent the above-mentioned magnetic field modulation head from vibrations or impacts from all directions, it is necessary to use a leaf spring. It is necessary to stabilize the spring load, and in order to stabilize this spring load, it is necessary to set the length of the leaf spring to be long. Therefore, if the length of the leaf spring is set to be long, the magnetic field modulation head is likely to be deformed or damaged by vibration or impact from any direction, and it is necessary to take measures to absorb or prevent more effective vibration or impact. Become.

Therefore, an object of the present invention is to protect the head of a magnetic field modulation head supported by a spring action by effectively absorbing or blocking vibrations or shocks from any direction. It is possible to achieve the stabilization of the spring load of the spring supporting the head,
It is an object of the present invention to provide a magnetic field modulation head that can simplify the assembly work and reduce the manufacturing cost.

[0016]

In order to achieve the above-mentioned object, a magnetic field modulation head according to the present invention is provided with a coil which is conductively connected to a flexible conductive piece having spring elasticity, and the coil and the core are combined. Is covered with a resin mold to form a slider, and an arm portion extending substantially parallel to the flexible conductive piece that elastically supports the slider is provided. In the magnetic field modulation head for magneto-optical recording, wherein the slider is brought into contact with and separated from the magneto-optical disk, a rear portion of the slider and a tip portion of the arm portion are arranged to face each other, First engaging means is provided between the rear end of the slider and the tip of the arm so as to allow vertical displacement and prevent horizontal displacement in the front-rear and left-right directions. Flexible with the tip of the arm A second engaging means configured to permit vertical displacement and prevent horizontal displacement in the front-rear direction and the left-right direction is provided between the conductive piece and the resin mold covering the outer peripheral portion of the conductive piece. Characterize.

In this case, the first engaging means forms an end portion in which the left and right are displaced stepwise at the rear portion of the slider, and the end displaced in the stepwise manner is formed at the tip portion of the arm portion facing this. It is possible to adopt a configuration in which locking pieces that engage with the upper and lower surfaces and restrict the displacement are provided in a protruding manner.

The second engaging means is such that the resin mold for covering the outer peripheral portion on the tip side of the flexible conductive piece is opposed to the tip portion of the arm portion, and only the opposing surface and the lower portion are opened. The engaging concave portion may be provided, and the tip of the arm portion may be provided with a protrusion that faces the engaging concave portion and is engaged and inserted into the engaging concave portion.

[0019]

Next, an embodiment of a magnetic field modulation head according to the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 show an embodiment of a magnetic field modulation head and a support mechanism for supporting the same according to the present invention. 1 and 2, reference numeral 10 indicates a magnetic field modulation head, and 20 indicates a support member that supports the magnetic field modulation head 10. However, in the present embodiment, the magnetic field modulation head 10 basically includes the coil 12 and the core 14, and surrounds the coil 12 and the core 14 integrally to face the magneto-optical disk surface, as in the prior art. The slider 16 is made of a resin mold.

On the other hand, one end of a pair of flexible conductive pieces 22, 22 extending in parallel is fixed to the support member 20, and the other end side of the pair of flexible conductive pieces 22, 22 is fixed.
The flexible conductive pieces 22 and 22 are provided on both sides of the magnetic field modulation head 10 so as to extend around the magnetic field modulation head 10.
The outer peripheral portion of is covered with a resin mold 23. And
The other ends 22a, 22a of the flexible conductive pieces 22, 22
Are embedded and fixed in the tip portion 16a of the slider 16 forming the magnetic field modulation head 10. Further, the extended conductive piece 2 is attached to the other end portions 22a, 22a of the flexible conductive pieces 22, 22.
Connection with the coil 12 of the magnetic field modulation head 10 is established via the wirings 4 and 24.

It should be noted that external connection terminal portions 22b and 22b that are conductively connected to the flexible conductive pieces 22 and 22 are provided on one side of the support member 20 to electrically connect to an external power source. Is configured. Further, resin mold strips 25a, 25b for partially insulating and fixing are applied to the pair of flexible conductive pieces 22, 22 extending in parallel.

However, in this embodiment, the flexible conductive piece 22, the extended conductive piece 24, and the external connection terminal portion 22 are used.
As b, a material having conductivity and elasticity (spring property), which can be preferably used, for example, one made of phosphor bronze, a stainless steel plate material, or beryllium copper.

Further, in this embodiment, the support member 20,
As the resin mold for forming the slider 16 and other resin molds for coating and protection, for example, polyacetal resin [POM], nylon resin (polyamide resin)
It can be easily manufactured by using a synthetic resin material such as [PA] or liquid crystal polymer [LCP].

Further, the supporting member 20 is provided with an arm portion 26 extending substantially parallel to one end side of the flexible conductive pieces 22 and 22, and a tip end portion 27 of the arm portion 26 is connected to the magnetic field. It is provided so as to be located on the rear portion 16b side of the slider 16 of the modulation head 10. However, the arm portion 26 is swingably attached to a part of the support member 20 via the pivot shaft 26a, and at the tip portion 27 and the middle portion 27 'thereof,
The magnetic field modulation head 10 is configured to be brought into contact with and separated from the magneto-optical disk by engaging with the flexible conductive pieces 22, 22.

Therefore, the magnetic field modulation head 1 according to the present invention.
0, the positional relationship between the resin mold 23 covering the outer peripheral portions of the flexible conductive pieces 22 and 22 and the tip portion 27 of the arm portion 26 on the rear side of the slider 16 is as follows. Compose the means.

That is, (a) of FIG. 3 and FIG.
(B), (c) is a principal part expanded explanatory view which shows one Example of the said engaging means. That is, in FIG. 3 and FIG. 4A, FIG. 4B, and FIG.
The rear portion 16b of the slider 16 is formed to extend slightly rearward, and the tip portion thereof is configured as an end portion 18 in which the left and right are displaced stepwise as shown in FIGS. 4 (a) and 4 (b). .
Therefore, facing the rear portion 16b of the slider 16,
The distal end portion 27 of the arm portion 26 is separated from the end portion 18 of the rear portion 16b of the slider 16 which is displaced stepwise so as to be able to come into contact with each other in the vertical direction, and regulates the displacement of the slider 16. The locking pieces 27a and 27b are provided so as to project.

Further, a part of the resin mold 23 for covering the outer peripheral portions of the flexible conductive pieces 22, 22 is made to face a part of the tip end portion 27 of the arm portion 26, as shown in FIG. As shown in (c), an engaging recess 23a is provided in which only the opposing surface and the lower side are in an open state, and a protrusion 27c that is engaged with and inserted into the engaging recess 23a is provided.

With this structure, the displacement end portion 18 of the slider 16 and the locking pieces 27a and 27b for restricting the displacement of the slider 16 are engaged with each other, so that the rear portion 16b of the slider 16 is provided. The first engaging means capable of restricting the displacement in the vertical direction, the horizontal direction, and the front-back direction (Z-axis, X-axis, and Y-axis direction) beyond the allowable limit.

Further, in the engaging recess 23a provided in the resin mold 23 for covering the outer peripheral portions of the flexible conductive pieces 22, 22,
By engaging and inserting the protrusion 27c provided on the tip portion 27 of the arm portion 26, the upper and lower, left and right and front and rear directions (Z-axis, X-axis and Y-axis direction) of the slider 16 above the allowable limit are exceeded. The second engaging means that can regulate the displacement of

In particular, according to the above configuration of the present invention, with respect to the front and rear of the slider 16, the displacement in the vertical direction (Z-axis direction) by the first engaging means and the second engaging means, respectively, The elastic elasticity of the flexible conductive pieces 22, 22 is used to allow a certain amount of displacement, but the slider 16 is hardly allowed to be displaced in the left-right and front-back directions (X-axis and Y-axis directions). , The displacement is regulated.

Therefore, according to the present invention, in the magnetic field modulation head supported by the spring action, it has a function of absorbing or preventing vibrations or impacts from any direction and supporting the heads. It is possible to achieve stabilization of the spring load of the spring, and to simplify the assembly work and reduce the manufacturing cost.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the spirit of the present invention. .

[0034]

As described above, the magnetic field modulation head according to the present invention is provided with a coil that is electrically connected to a flexible conductive piece having spring elasticity, and the coil and the core are combined to cover them with a resin mold. A slider is formed, and an arm portion extending substantially parallel to the flexible conductive piece elastically supporting the slider is provided, and the arm portion is partially engaged with the flexible conductive piece, In a magnetic field modulation head for magneto-optical recording, wherein the slider is configured to come into contact with and separate from a magneto-optical disk, a rear portion of the slider and a tip portion of the arm portion are arranged to face each other, and a rear end portion of the slider is provided. A first structure configured to allow vertical displacement between the arm and the distal end and prevent horizontal horizontal and lateral displacement.
Is provided, and the displacement in the vertical direction is allowed between the distal end portion of the arm portion and the resin mold covering the distal end side outer peripheral portion of the flexible conductive piece, and horizontal displacement in the front-rear direction and the horizontal direction. By providing the second engaging means configured so as to prevent the above, it has a function of absorbing or preventing the vibration or shock from any direction to the magnetic field modulation head. The spring load of the spring supporting the head can be stabilized and the head can be protected, and the assembling work can be simplified to reduce the manufacturing cost.

[Brief description of drawings]

FIG. 1 is a schematic bottom view showing an embodiment of a magnetic field modulation head and a support mechanism thereof according to the present invention.

FIG. 2 is a schematic side view of the magnetic field modulation head shown in FIG. 1 and its support mechanism.

3 is an exploded perspective view of essential parts of a magnetic field modulation head portion shown in FIG. 1. FIG.

FIG. 4A is a IVa-IV of the magnetic field modulation head shown in FIG.
FIG. 3B is a sectional view of the main part of the line a, and FIG.
IVb-IVb line main part sectional view, (c) is a magnetic field modulation head IVc-IVc line main part sectional view shown in FIG.

FIG. 5 is a main part schematic plan view showing a configuration example of a conventional magnetic field modulation head and a support mechanism thereof.

6 is a plan view of relevant parts of a magnetic field modulation head portion shown in FIG.

7 is a sectional view taken along line VII-VII of the magnetic field modulation head shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 magnetic field modulation head 12 coil 14 core 16 slider 16a front end part 16b rear part 18 end part (displacement end part) 20 support member 22 flexible conductive piece 22a other end part 22b external connection terminal part 23 resin mold 23a engagement recess 24 24 extension Conductive piece 25a, 25b Resin mold band 26 Arm section 26a Pivot shaft 27 Tip section 27 'Middle section 27a, 27b Locking piece 27c Projection

Claims (3)

[Claims] 1. A coil is provided which is electrically connected to a flexible conductive piece having spring elasticity, the coil and the core are combined, and these are covered with a resin mold to form a slider, and the slider is elastically supported. An arm extending substantially parallel to the flexible conductive piece is provided, and the arm is partially engaged with the flexible conductive piece so that the slider can be brought into contact with and separated from the magneto-optical disk. In the magnetic field modulation head for magneto-optical recording, the rear part of the slider and the tip part of the arm part are arranged to face each other, and vertical displacement is made between the rear end part of the slider and the tip part of the arm part. A resin is provided which is provided with a first engaging means configured to permit and prevent horizontal displacement in the front-rear direction and the left-right direction, and further covers the distal end portion of the arm portion and the outer peripheral portion on the distal end side of the flexible conductive piece. Allows vertical displacement with the mold Magnetic field modulation head and providing a second engaging means arranged so as to prevent the horizontal longitudinal and lateral direction displacement thereby. 2. The first engaging means forms an end portion in which a left side and a right side are displaced stepwise at a rear portion of the slider, and the stepwise displaced end portion is formed at a tip end portion of an arm portion opposed to the end portion. On the other hand, the magnetic field modulation head according to claim 1, wherein locking pieces that project from the upper and lower surfaces and restrict the displacement are provided in a protruding manner. 3. The second engaging means is configured such that a resin mold for covering the outer peripheral portion on the tip end side of the flexible conductive piece is opposed to the tip end portion of the arm portion, and only the opposing surface and the lower portion are opened. 2. The magnetic field modulation head according to claim 1, wherein said engaging concave portion is provided, and a projection facing said engaging concave portion and engaged with and inserted into said distal end portion of said arm portion.