JP2006228384A - Magnetic transfer method and magnetic transfer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic transfer method and a magnetic transfer device capable of executing good magnetic transfer by suppressing the disturbance of magnetization patterns in all areas, regarding the magnetic transfer method and the magnetic transfer device adapted to transfer the magnetic patterns of a master disk to a slave disk. <P>SOLUTION: The application direction of an initial magnetization magnetic field Hin is set to be roughly vertical to the tracking scan direction of a recording/reproducing magnetic head 81 in the innermost peripheral track T1 of the slave disk 2 on a plane parallel to the slave disk 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a magnetic transfer method and a magnetic transfer apparatus, and more particularly to a magnetic transfer method for magnetically transferring information from a master disk on which information to be transferred is formed in a pattern to a slave disk for transfer, which is a magnetic recording medium, and The present invention relates to a magnetic transfer apparatus.

  Magnetic disks, which are high-density magnetic recording media used in hard disk devices, flexible disk devices, and the like, are capable of high-speed access and are required to have a larger information recording capacity.

  In order to realize this large capacity, the track width is narrowed, and so-called tracking servo technology for accurately scanning the magnetic head within this narrow track width plays an important role.

  On the magnetic disk, a tracking servo signal, an address information signal, a reproduction clock signal, and the like are recorded at a predetermined interval as a preformat for performing tracking servo.

  As a method of accurately and efficiently performing this preformatting in a short period of time, the applicant of the present application has used unevenness corresponding to information to be transferred to a transfer target disk (hereinafter referred to as a slave disk) serving as a high-density magnetic recording medium. A master disk having a patterned magnetic layer is prepared, and the magnetic layer of the slave disk is preliminarily magnetized in one direction of the track in advance, and then the initial magnetization is performed with the slave disk and master disk in close contact with each other. A magnetic transfer method has been proposed in which a transfer magnetic field substantially opposite to the direction is applied (see, for example, Patent Document 1).

In this case, the optimum strength of the initial DC magnetic field applied to initially magnetize the magnetic layer of the slave disk is about twice or more the coercive force Hc of the magnetic layer of the slave disk, and the optimum strength of the magnetic field for transfer is the slave disk. The coercive force Hc of the magnetic layer was about.
JP 2001-014667 A

  FIG. 1 shows a hard disk drive in which a hard disk that is a high-density magnetic recording medium is incorporated. A slave disk 2 as a hard disk is attached to a shaft 86 and rotates. A recording / reproducing magnetic head 81 for reading information recorded on the slave disk 2 is attached to a suspension 82, fixed to a rotating shaft 84 by a leaf spring 83, and moved on a track indicated by a one-dot chain line in the figure by a voice coil motor 85. To do.

  This trajectory is referred to as tracking scanning trajectory R. The tracking scanning trajectory R is an arc centered on the rotation shaft 84, and the recording / reproducing magnetic head 81 accurately scans the tracking scanning trajectory R and aligns with the track.

  Further, the concave / convex pattern of the magnetic layer corresponding to the information to be transferred to the slave disk of the master disk is as shown in FIG. 2, for example, and includes a convex portion 3B and a concave portion 3C, and the magnetic layer of the convex portion 3B. The magnetic transfer is performed in a state of being in close contact with the magnetic layer of the slave disk.

  In FIG. 2, the arrow X indicates the circumferential direction (track direction) of the master disk 3, and the arrow Y indicates the radial direction of the master disk 3. P indicates the track width.

  FIG. 3 exaggerates the convex portion 3B of the concave-convex pattern of the master disk. The master disk 3 has a center hole 3A, and a track is formed from the center hole 3A toward the outer periphery.

  As shown in FIG. 3, the direction of the convex portion 3B of the concave / convex pattern of each track is formed so as to substantially coincide with the tangential direction (tracking scanning direction) of the tracking scanning trajectory R of the recording / reproducing magnetic head 81.

  Therefore, the direction of the magnetic field for initial magnetization of the slave disk 2 and the direction of the magnetic field for transfer (although the directions are opposite to each other) are tangent to the tracking scan trajectory R with respect to all the tracks in the radial direction. It is preferable to apply in a direction perpendicular to the direction (tracking scanning direction).

  In this way, by making the magnetic field application direction for initial magnetization and transfer perpendicular to the tracking scanning direction for all tracks at each radial position, accurate magnetic transfer and reproduction signal output are performed. Therefore, good tracking scanning can be performed.

  However, as described above, it is very difficult to make the magnetic field application direction perpendicular to the tracking scanning direction with respect to the tracks on the entire surface of the slave disk 2, and this has been an obstacle to performing high-precision magnetic transfer. .

  The present invention has been made in view of such circumstances, and extends from the innermost track to the outermost track in a magnetic transfer method and a magnetic transfer apparatus for transferring a magnetic pattern of a master disk to an initially magnetized slave disk. It is an object of the present invention to provide a magnetic transfer method and a magnetic transfer apparatus capable of performing good magnetic transfer with suppressed magnetization pattern disturbance in the entire region.

  In order to achieve the above object, the invention according to claim 1 is directed to a slave disk for transfer in which a magnetic layer is initially magnetized in one direction of a concentric track and information on the magnetic layer of the slave disk. The magnetic field for transfer is applied to the magnetic layer of the slave disk by applying a transfer magnetic field in a direction opposite to the direction of the initial magnetization in a state in which the master disk having a patterned magnetic layer for transferring the surface is in close contact with the master disk. In the magnetic transfer method for magnetically transferring information, the application direction of the magnetic field for initial magnetization is parallel to the slave disk, and the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk It is applied so that it may become substantially perpendicular | vertical.

  According to a second aspect of the present invention, there is provided a slave disk for transfer in which a magnetic layer is initially magnetized in one direction of a concentric track, and a pattern for transferring information to the magnetic layer of the slave disk. A magnetic field for transfer is applied in a direction opposite to the direction of the initial magnetization in a state in which a master disk having a magnetic layer on the surface is in close contact, and the information is magnetically transferred to the magnetic layer of the slave disk In the magnetic transfer method, the application direction of the magnetic field for transfer is applied so as to be substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk. It is characterized by doing.

  According to a third aspect of the present invention, there is provided a slave disk for transfer in which a magnetic layer is initially magnetized in one direction of a concentric track, and a pattern for transferring information to the magnetic layer of the slave disk. A magnetic field for transfer is applied in a direction opposite to the direction of the initial magnetization in a state in which a master disk having a magnetic layer on the surface is in close contact, and the information is magnetically transferred to the magnetic layer of the slave disk In the magnetic transfer method, the application direction of the initial magnetization magnetic field and the transfer magnetic field is substantially the same as the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk. It applies so that it may become perpendicular | vertical.

  According to a fourth aspect of the present invention, in the first or third aspect of the invention, the center of the slave disk is shifted from the central axis of the magnetic field distribution generated from the initial magnetization magnetic field generator. So that the direction of application of the initial magnetization magnetic field is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk in a plane parallel to the slave disk. It is characterized by that.

  According to a fifth aspect of the present invention, in the second or third aspect of the present invention, the center of the slave disk is shifted from the central axis of the magnetic field distribution generated from the magnetic field generator for transfer. And the direction in which the magnetic field for transfer is applied is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk in a plane parallel to the slave disk. It is characterized by.

  According to a sixth aspect of the present invention, there is provided a slave disk for transfer in which a magnetic layer is initially magnetized in one direction of a concentric track, and a pattern for transferring information to the magnetic layer of the slave disk. A magnetic field for transfer is applied in a direction opposite to the direction of the initial magnetization in a state in which a master disk having a magnetic layer on the surface is in close contact, and the information is magnetically transferred to the magnetic layer of the slave disk In the magnetic transfer apparatus, the direction of application of the initial magnetization magnetic field is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk. A magnetic field generator for initial magnetization to be applied is provided.

  According to a seventh aspect of the present invention, there is provided a slave disk for transfer in which a magnetic layer is initially magnetized in one direction of a concentric track, and a pattern for transferring information to the magnetic layer of the slave disk. A magnetic field for transfer is applied in a direction opposite to the direction of the initial magnetization in a state in which a master disk having a magnetic layer on the surface is in close contact, and the information is magnetically transferred to the magnetic layer of the slave disk In the magnetic transfer apparatus, the application direction of the magnetic field for transfer is applied so that it is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk. A transfer magnetic field generating device is provided.

  According to an eighth aspect of the present invention, there is provided a slave disk for transfer in which a magnetic layer is initially magnetized in one direction of a concentric track, and a pattern for transferring information to the magnetic layer of the slave disk. A magnetic field for transfer is applied in a direction opposite to the direction of the initial magnetization in a state in which a master disk having a magnetic layer on the surface is in close contact, and the information is magnetically transferred to the magnetic layer of the slave disk In the magnetic transfer apparatus, the direction of application of the initial magnetization magnetic field is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk. A magnetic field generator for initial magnetization to be applied, and a direction in which the application direction of the magnetic field for transfer is parallel to the slave disk; Characterized in that the transfer magnetic field generator for applying to be tracking scanning direction substantially perpendicular recording magnetic head in the innermost track, is provided.

  The invention according to claim 9 is the invention according to claim 6 or claim 8, wherein the center of the slave disk is shifted from the center axis of the magnetic field distribution generated from the magnetic field generator for initial magnetization. So that the direction of application of the initial magnetization magnetic field is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk in a plane parallel to the slave disk. It is characterized by comprising.

  According to a tenth aspect of the present invention, in the seventh or eighth aspect, the center of the slave disk is shifted from the central axis of the magnetic field distribution generated from the magnetic field generator for transfer. The transfer magnetic field application direction is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk. It is characterized by that.

  According to the present invention, the initial magnetization magnetic field is applied in such a direction that the magnetic field for initial magnetization is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk. Magnetization magnetic field generator and / or transfer magnetic field applied in a direction parallel to the slave disk so that it is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk. The magnetic field for transfer and the application direction of the magnetic field for transfer and / or the magnetic field for transfer are parallel to the slave disk, and the tracking scanning direction of the recording / reproducing magnetic head on the innermost track of the slave disk Because it is applied so that it is almost perpendicular, the Restricting the application direction in the optimum direction, the applied direction loosening the restriction on the outer peripheral side track no practical problem be offset from some optimal direction, which make it possible to perform good magnetic transfer as a whole. Therefore, tracking scanning can be performed with high accuracy.

  Further, since the center of the slave disk is arranged at a position shifted from the central axis of the magnetic field distribution generated from the magnetic field generator for initial magnetization and / or the magnetic field generator for transfer, the magnetic field for initial magnetization and / Or the application direction of the magnetic field for transfer can be applied so that the direction parallel to the slave disk is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk. .

  As described above, according to the magnetic transfer method and the magnetic transfer apparatus of the present invention, the tracking magnetization direction of the recording / reproducing magnetic head in the innermost track of the slave disk on the plane parallel to the slave disk is the initial magnetization magnetic field. Therefore, the magnetic field application direction can be set to an optimum direction with respect to the track on the inner peripheral side having severe conditions, and good initial magnetization can be performed as a whole.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a magnetic transfer method and a magnetic transfer apparatus according to the present invention will be described in detail below with reference to the accompanying drawings. In each figure, the same number or symbol is attached to the same member.

  FIG. 4 is a perspective view showing a main part of initial magnetization means (initial magnetization magnetic field generator) for initial magnetization of a slave disk as a transfer disk. The initial magnetization means 20 constituting the magnetic transfer apparatus 10 includes a chuck stage (not shown) on which the slave disk 2 is mounted and rotated, a magnet 20A, and the like. The magnet 20A is an electromagnet, and includes at least a core 22 having a head constituting a gap 21 extending in the radial direction from the innermost track to the outermost track of the slave disk 2, and a coil (not shown) wound around the core. It is made up of.

  When a coil is energized, a DC magnetic field is generated, and the chuck stage rotates in the direction of arrow A shown in FIG. 4 so that the entire area of the magnetic layers 2b and 2c of the slave disk 2 is magnetized in one direction. . As shown in FIG. 4, an initial DC magnetic field (initial magnetization magnetic field) Hin to the slave disk 2 is generated in the gap 21 between the heads of the core 22 along the track direction by the magnet 20A. Although an electromagnet is used as the magnet 20A, a permanent magnet may be used.

  The initial DC magnetic field Hin is preferably a magnetic field that is about twice or more the coercive force Hc of the magnetic layers 2b and 2c on the upper and lower surfaces of the slave disk 2. Therefore, in the present embodiment, the gap 21 of the magnet 20A is set to a value that is half or less of the radius of the innermost track of the slave disk 2, and the distance between the gap 21 and the magnetic layer 2b of the slave disk 2 is preferably 10 mm or less. Is made close to a numerical value of 5 mm or less, more preferably 3 mm or less. For example, when the radius of the innermost track is 4.7 mm, the gap 21 is 2.3 mm or less, and the distance between the gap 21 and the magnetic layer 2 b of the slave disk 2 is 3 mm or less.

  FIG. 5 is a perspective view showing a main part of a transfer magnetic field applying means (transfer magnetic field generating device) for applying a transfer magnetic field for magnetically transferring information magnetically recorded on the master disk to the slave disk 2. The magnetic field applying means 30 for transfer constituting the magnetic transfer apparatus 10 includes a holder 50 that holds the slave disk 2 and the master disk in close contact with each other, magnets 30A and 30B disposed on the upper and lower surfaces of the holder 50, and a holder. 50 and a rotating means (not shown) that rotates the holder 50 in the direction of arrow A in the figure with respect to the magnets 30A and 30B.

  An electromagnet is used as the magnet 30A. As shown in FIG. 5, a core 32 having a head that forms a gap 31 extending in the radial direction from at least the innermost track to the outermost track of the slave disk 2, and a core And a coil (not shown) wound around 32. The magnet 30B has the same configuration.

  When a coil is energized, a DC magnetic field is generated, and a rotating means (not shown) rotates the holder 50 in the direction of arrow A shown in FIG. 2 so that the information on the master disk is transferred to the entire track area of the slave disk 2. ing. In addition, although the electromagnet was used as the magnet 30A and the magnet 30B, you may use a permanent magnet.

  In the present embodiment, the slave disk 2 is sandwiched between two master disks, and information on the master disk is transferred to both the upper and lower surfaces of the slave disk 2. 30B is arranged, but when a single master disk is used and magnetic information is transferred only to the upper or lower surface of the slave disk 2, only one magnet may be arranged on one side of the holder 50.

  As shown in FIG. 6, the holder 50 is composed of a lower holder 51, an upper holder 52, and the like. The slave disk 2 has a magnetic layer 2c on the lower surface and a magnetic layer on the upper surface of the master disk 3 in close contact with each other. The layer 2 b and the magnetic layer on the lower surface of the master disk 4 are sandwiched between the lower holder 51 and the upper holder 52 while being in close contact with each other. In this state, a magnetic field for transfer is applied to the slave disk 2 from both the upper and lower surfaces of the holder 50, and magnetic information such as servo signals of the master disks 3 and 4 is transferred to the upper and lower surfaces of the slave disk 2.

  As shown in FIG. 5, a magnetic field for transfer Hdu to the slave disk 2 is generated in the direction opposite to the initial magnetization along the track direction in the inter-head gap 31 of the core 32 by the magnet 30A. The same applies to the electromagnet 30B side.

  The strength of the transfer magnetic field Hdu is preferably 0.6 to 1.3 times, more preferably 0.8 to 1.times. The holding force Hc of the magnetic layers 2b and 2c on the upper and lower surfaces of the slave disk 2. It is 2 times, more preferably 1 to 1.1 times.

  Next, the magnetic field application directions by the initial magnetization unit 20 and the transfer magnetic field application unit 30 will be described in detail. FIG. 7 is a conceptual plan view showing a state in which a magnetic field for initial magnetization is applied to the slave disk 2. As shown in FIG. 7, the center Q of the slave disk 2 is shifted by a distance S from the central axis C2 of the distribution of the initial DC magnetic field Hin generated by the magnet 20A (in this case, the center line of the gap of the magnet 20A). A magnet 20A is disposed on the surface.

  This distance S is such that the application direction of the initial DC magnetic field Hin is 90 ° ± 5 ° with respect to the tangent line (tracking scanning direction) of the tracking scanning trajectory R of the recording / reproducing magnetic head 81 in the innermost track T1 of the slave disk 2. (Preferably 90 ° ± 3 °, more preferably 90 ° ± 2 °).

  In this case, as is apparent from FIG. 7, in the outermost track Tn, the application direction of the DC magnetic field Hin is slightly deviated from 90 ° with respect to the tracking scanning direction. However, even if the track on the outer peripheral side of the slave disk 2 is slightly deviated from 90 °, there is no practical problem.

  In this state, the magnet 20A or the slave disk 2 is rotated relative to the center Q of the slave disk 2 as the rotation center (in the direction of arrow A in the figure), and initial magnetization is performed on the tracks on the entire surface of the slave disk 2.

  FIG. 8 is a conceptual plan view showing a state in which a magnetic field for transfer is applied while the slave disk 2 and the master disk 3 are in close contact with each other. Similarly to the magnetic field for initial magnetization, the center Q of the master disk 3 and the slave disk 2 is the center axis of the distribution of the transfer magnetic field Hdu generated by the magnet 30A as shown in FIG. The magnet 30A is arranged so as to be shifted by a distance S from the center line (C3) of 30A.

  Also in this distance S, the application direction of the transfer magnetic field Hdu is tangent to the tracking scanning track R of the recording / reproducing magnetic head 81 in the innermost track T1 of the slave disk 2 (master disk 3) (tracking scanning direction). It is determined to be 90 ° ± 5 ° (preferably 90 ° ± 3 °, more preferably 90 ° ± 2 °).

  Also in this case, as apparent from FIG. 8, in the outermost track Tn, the application direction of the transfer magnetic field Hdu slightly deviates from 90 ° with respect to the tracking scanning direction. However, there is no practical problem even if the outer peripheral track of the slave disk 2 (master disk 3) is slightly deviated from 90 °.

  In this state, the magnet 30A or the close contact body of the slave disk 2 and the master disk 3 is relatively rotated with the center Q of the slave disk 2 (master disk 3) as the center of rotation (in the direction of arrow A in the figure). Magnetic information of the master disk 3 is magnetically transferred to the track.

  FIG. 9 is an enlarged view of a portion of the innermost track T1 of the master disk 3 in FIG. As shown in FIG. 9, the magnet 30A is arranged so as to be shifted by a distance S from the center axis of the distribution of the magnetic field for transfer Hdu generated by the magnet 30A (in this case, the center line of the gap of the magnet 30A) C3. The application direction of the magnetic field Hdu is 90 ° ± 5 ° (preferably 90 ° ± 3 °, preferably with respect to the tangent (tracking scanning direction) of the tracking scanning orbit R of the recording / reproducing magnetic head 81 in the innermost track T1. The position of the magnet 30A (or the close contact body of the slave disk 2 and the master disk 3) is adjusted so as to be preferably 90 ° ± 2 °. In other words, in the innermost track T1 of the master disk 3, the angle α formed between the side of the projection 3B of the concavo-convex pattern to which the transfer magnetic field Hdu is applied and the direction in which the transfer magnetic field Hdu is applied is 90 ° ±. It is adjusted to be 5 ° (preferably 90 ° ± 3 °, more preferably 90 ° ± 2 °).

  As described above, the magnetic field application direction can be made substantially perpendicular to the tracking scanning direction in the innermost track T1 only by shifting the positions of the magnets 20A and 30A by a predetermined amount from the center Q of the disk. The magnetic field application direction is regulated to the optimal direction for the inner circumference side of the stricter track, and even if the application direction is slightly deviated from the optimum direction, the regulation is relaxed on the outer circumference side track, which has no practical problem, and overall good magnetic properties Transcription can be performed.

  Next, a magnetic transfer method and transfer mechanism for magnetically transferring the magnetic pattern of the master disk 3 to the magnetic layer 2c of the slave disk 2 will be described.

  FIG. 10 is an explanatory diagram showing the magnetic transfer process. In FIG. 10, the upper magnetic layer 2b of the slave disk 2 is omitted, and only the transfer to the lower magnetic layer 2c is described to simplify the illustration and description.

  First, as shown in FIG. 10A, initial magnetization of the slave disk 2 is performed. As shown in FIG. 4, in the initial magnetization, the slave disk 2 is fixed to a chuck stage (not shown) of the initial magnetization means 20, and an initial DC magnetic field Hin along the tangential direction of the track is generated in one direction by the magnet 20A. At the same time, the chuck stage is rotated one or more times with respect to the magnet 20A, and an initial DC magnetic field is applied to all track regions of the magnetic layers 2b and 2c of the slave disk 2.

  At this time, the application direction of the initial DC magnetic field Hin is 90 ° ± 5 ° (preferably with respect to the tangent (tracking scanning direction) of the tracking scanning orbit R of the recording / reproducing magnetic head 81 in the innermost track T1 of the slave disk 2. Is 90 ° ± 3 °, more preferably 90 ° ± 2 °).

  Note that the initial magnetization of the slave disk 2 may be performed simultaneously on the upper and lower magnetic layers 2b and 2c of the slave disk 2 or may be performed twice on either side.

  Next, as shown in FIG. 5, the upper and lower surfaces of the initially magnetized slave disk 2 are brought into close contact with the master disks 3 and 4 and held between holders 50 and held by a rotating means (not shown) of the magnetic field applying means 30 for transfer. Let

  Next, the magnetic field Hdu opposite to the initial magnetization direction is generated by the magnets 30A and 30B, the holder 50 is rotated by one or more rotations with respect to the magnets 30A and 30B, and the magnetic field for transfer is applied to the entire area of the track. The information recorded as magnetic patterns on the master disks 3 and 4 is magnetically transferred to the upper and lower surfaces of the slave disk 2.

  At this time, the application direction of the transfer magnetic field Hdu is 90 ° with respect to the tangent line (tracking scanning direction) of the tracking scanning orbit R of the recording / reproducing magnetic head 81 in the innermost track T1 of the slave disk 2 (master disk 3). It is determined to be ± 5 ° (preferably 90 ° ± 3 °, more preferably 90 ° ± 2 °).

  This transcription mechanism is as follows. That is, as shown in FIG. 10B, magnetic information is formed as an uneven magnetic layer pattern on the magnetic layer 3 b of the master disk 3. Since a magnetic field stronger than the transfer magnetic field Hdu is applied to the surface of the magnetic layer 2c of the slave disk 2 that is not in contact with the magnetic layer 3b of the master disk 3, the transfer magnetic field exceeds the holding force Hc of the magnetic layer 2c of the slave disk 2. And the magnetization of that part is reversed.

  On the other hand, in the magnetic layer 2 c of the slave disk 2 in contact with the magnetic layer 3 b of the master disk 3, the transfer magnetic field Hdu is concentrated on the magnetic layer 3 b of the master disk 3. That is, the portion is in a state where the transfer magnetic field is shielded. As a result, only a magnetic field significantly weaker than the transfer magnetic field Hdu is applied to the magnetic layer 2c of the slave disk 2, so that the magnetization of the slave disk 2 remains in the initial magnetization direction without being affected by the transfer magnetic field Hdu. The magnetized state is as shown in (c). As a result, the patterned magnetic information formed on the magnetic layer 3b of the master disk 3 is transferred to the magnetic layer 2c of the slave disk 2 and magnetically recorded.

  In the present embodiment, the magnetic transfer apparatus 10 has been described as having a configuration in which the slave disk 2 and the master disks 3 and 4 are held horizontally. However, the magnetic transfer apparatus 10 is not limited to the horizontal direction and may be configured to hold in the vertical direction. You may make it hold | maintain in the direction inclined by the predetermined angle with respect to the horizontal direction.

Plan view explaining the hard disk drive Perspective view showing the uneven pattern of the master disk Plan view exaggerating the convex part of the master disk Perspective view showing initial magnetization means of magnetic transfer device Perspective view showing transfer magnetic field applying means The perspective view explaining a holder 1 is a conceptual plan view for explaining a magnetic transfer method according to an embodiment of the present invention. 2 is a conceptual plan view illustrating a magnetic transfer method according to an embodiment of the present invention. Enlarged view of the innermost track in FIG. Conceptual diagram explaining the magnetic transfer process

Explanation of symbols

  2 ... slave disk (transfer target disk); 2b, 2c, 3b, 4b ... magnetic layer; 3, 4 ... master disk; 10 ... magnetic transfer device; 20 ... initial magnetization means (magnetic field generator for initial magnetization); Transfer magnetic field applying means (transfer magnetic field generating device); 81: magnetic head for recording / reproducing; C2, C3: central axis of magnetic field distribution; Hin: initial direct current magnetic field (initial magnetic field); Hdu: transfer magnetic field; ... center; R ... tracking scanning orbit; T1 ... innermost track; Tn ... outermost track

Claims (10)

A master disk having a magnetic layer with a concentric track in which the magnetic disk is initially magnetized in one direction and a patterned magnetic layer on the surface for transferring information to the magnetic layer of the slave disk In a magnetic transfer method in which the information is magnetically transferred to the magnetic layer of the slave disk by applying a transfer magnetic field in a direction opposite to the direction of the initial magnetization,
The initial magnetization magnetic field is applied in a direction parallel to the slave disk so as to be substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk. Magnetic transfer method. A master disk having a magnetic layer with a concentric track in which the magnetic disk is initially magnetized in one direction and a patterned magnetic layer on the surface for transferring information to the magnetic layer of the slave disk In a magnetic transfer method in which the information is magnetically transferred to the magnetic layer of the slave disk by applying a transfer magnetic field in a direction opposite to the direction of the initial magnetization,
The transfer magnetic field is applied so that the direction in which the magnetic field for transfer is applied is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk. Magnetic transfer method. A master disk having a magnetic layer with a concentric track in which the magnetic disk is initially magnetized in one direction and a patterned magnetic layer on the surface for transferring information to the magnetic layer of the slave disk In a magnetic transfer method in which the information is magnetically transferred to the magnetic layer of the slave disk by applying a transfer magnetic field in a direction opposite to the direction of the initial magnetization,
The initial magnetization magnetic field and the transfer magnetic field are applied so that the application directions of the magnetic field for transfer and the magnetic field for transfer are substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk. And a magnetic transfer method.   The center of the slave disk is arranged at a position shifted from the central axis of the magnetic field distribution generated from the magnetic field generator for initial magnetization, and the application direction of the magnetic field for initial magnetization is parallel to the slave disk. 4. The magnetic transfer method according to claim 1, wherein the surface is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk.   The center of the slave disk is arranged at a position shifted from the central axis of the magnetic field distribution generated from the transfer magnetic field generator, and the application direction of the transfer magnetic field is in a plane parallel to the slave disk. 4. The magnetic transfer method according to claim 2, wherein the magnetic recording method is substantially perpendicular to a tracking scanning direction of a recording / reproducing magnetic head in an innermost track of the slave disk. A master disk having a magnetic disk with a magnetic layer initially magnetized in one direction of a concentric track and a patterned magnetic layer on the surface for transferring information to the magnetic layer of the slave disk In a magnetic transfer device that applies a transfer magnetic field in a direction opposite to the direction of the initial magnetization and magnetically transfers the information to the magnetic layer of the slave disk.
Initial magnetization magnetic field applied so that the direction of application of the initial magnetization magnetic field is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk A magnetic transfer device comprising a generator. A master disk having a magnetic layer with a concentric track in which the magnetic disk is initially magnetized in one direction and a patterned magnetic layer on the surface for transferring information to the magnetic layer of the slave disk In a magnetic transfer device that applies a transfer magnetic field in a direction opposite to the direction of the initial magnetization and magnetically transfers the information to the magnetic layer of the slave disk.
Transfer magnetic field generator for applying the transfer magnetic field so that the application direction of the transfer magnetic field is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk A magnetic transfer apparatus comprising: A master disk having a magnetic layer with a concentric track in which the magnetic disk is initially magnetized in one direction and a patterned magnetic layer on the surface for transferring information to the magnetic layer of the slave disk In a magnetic transfer device that applies a transfer magnetic field in a direction opposite to the direction of the initial magnetization and magnetically transfers the information to the magnetic layer of the slave disk.
Initial magnetization magnetic field applied so that the direction of application of the initial magnetization magnetic field is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk A generator,
Transfer magnetic field generator for applying the transfer magnetic field so that the application direction of the transfer magnetic field is substantially perpendicular to the tracking scanning direction of the recording / reproducing magnetic head in the innermost track of the slave disk on a plane parallel to the slave disk And a magnetic transfer device.   The center of the slave disk is arranged at a position shifted from the central axis of the magnetic field distribution generated from the magnetic field generator for initial magnetization, and the application direction of the magnetic field for initial magnetization is parallel to the slave disk. 9. The magnetic transfer device according to claim 6, wherein the magnetic transfer device is configured so that a surface thereof is substantially perpendicular to a tracking scanning direction of a recording / reproducing magnetic head in an innermost track of the slave disk.   The center of the slave disk is arranged at a position shifted from the central axis of the magnetic field distribution generated from the transfer magnetic field generator, and the application direction of the transfer magnetic field is in a plane parallel to the slave disk. 9. The magnetic transfer apparatus according to claim 7, wherein the magnetic transfer device is configured to be substantially perpendicular to a tracking scanning direction of a recording / reproducing magnetic head in an innermost track of the slave disk.

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