JP2004310873A - Magnetic transfer master carrier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To permit continuous and proper magnetic transfer, in which a flaw does not occur in a slave medium, in performing the magnetic transfer by bringing the magnetic transfer master carrier into close contact with the slave medium, and in which the degree of the close contact is secured sufficiently. <P>SOLUTION: The diameter rma of the central hole 1a of the magnetic transfer master carrier 1 is equal to or more than the diameter rsa of the central hole 2a of the slave medium 2; the outer diameter rmb of the master carrier 1 is equal to or less than the other diameter rsb of the slave medium 2; and the central hole 1a and the circumferential edge 1c of the outer circumference 1b of the master carrier 1 are chamfered. The difference La between the diameters of the inner circumferential parts at the contact surface 5 of the two is in the range of 0-2 mm, and the difference Lb between the outer circumferential parts is in the range of 0-500 μm. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic transfer master carrier used in a magnetic transfer method in which magnetic transfer is performed from a master carrier carrying transfer information to a slave medium to be transferred.
[0002]
[Prior art]
The magnetic transfer that is the subject of the present invention includes a master carrier (patterned master) in which a transfer pattern such as a servo signal having a magnetic layer at least on the surface layer is formed in a concavo-convex shape or an embedded structure, and a slave medium having a magnetic recording unit. In a close contact state, a magnetic field for transfer is applied to transfer and record a magnetization pattern corresponding to information carried on a master carrier onto a slave medium (see, for example, Patent Documents 1 to 3).
[0003]
When the slave medium is a disk-shaped medium such as a hard disk or a high-density flexible disk, the master carrier is also disk-shaped and has a transfer pattern formed concentrically, and the master medium is provided on one or both sides of the slave medium. With the carrier in close contact, a magnetic field application device using an electromagnet device or a permanent magnet device is disposed on one or both sides of the carrier to apply a transfer magnetic field.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 10-40544
[Patent Document 2]
Japanese Patent Laid-Open No. 10-269566
[Patent Document 3]
JP-A-11-175973 [0007]
[Problems to be solved by the invention]
When performing the magnetic transfer as described above, the slave medium and the master carrier are brought into close contact with each other. At this time, if there is a contact failure even in a part, there may be a transfer failure. One possible cause of poor adhesion is the presence of burrs on the periphery of the master carrier when it is produced. Burr is a serious problem because it may cause poor adhesion and may cause damage to the slave medium.
[0008]
Therefore, a method of eliminating the influence of burrs by making the outer shape of the master carrier sufficiently larger than that of the slave medium, for example, so that the burrs of the master carrier do not contact the slave medium can be considered.
[0009]
On the other hand, the peripheral edge of the slave medium is usually chamfered, but the chamfered portion cannot be sufficiently cleaned in the slave medium cleaning process, and a lot of dust adheres thereto. Therefore, when the outer circumference of the master carrier is made larger than the outer circumference of the slave medium, the dust on the outer circumference edge of the slave medium adheres to the surface of the outer circumference of the master carrier. The dust adhering to the outer peripheral portion of the master carrier may move to a portion in contact with the slave medium. In this case, the adhesion between the master carrier and the slave medium may be caused.
[0010]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a magnetic transfer master carrier capable of ensuring sufficient adhesion with a slave medium without causing damage to the slave medium during magnetic transfer. It is what.
[0011]
Furthermore, the present invention provides a master for magnetic transfer that does not cause damage to the slave medium at the time of magnetic transfer, can ensure sufficient adhesion with the slave medium, and is hardly contaminated by dust on the peripheral edge of the slave medium. The object is to provide a carrier.
[0012]
[Means for Solving the Problems]
The first magnetic transfer master carrier of the present invention is a disk-shaped master carrier for magnetic transfer provided on the surface with a transfer pattern for transferring information to a disk-like slave medium,
The outer peripheral edge on the surface side is chamfered.
[0013]
In the first magnetic transfer master carrier of the present invention, it is preferable that the outer diameter is equal to or smaller than the outer diameter of the slave medium.
[0014]
Here, “chamfering” means not only deburring but also making the peripheral corners obtuse or rounded (the same applies hereinafter).
[0015]
Furthermore, when the first magnetic transfer master carrier of the present invention has a center hole, it is desirable that the peripheral edge of the center hole on the surface side be chamfered.
[0016]
In the case where the slave medium has a central hole, it is desirable that the diameter of the central hole whose peripheral edge is chamfered is equal to or larger than the diameter of the central hole of the slave medium.
[0017]
The second magnetic transfer master carrier of the present invention is a disk-like magnetic transfer master carrier having a transfer pattern for transferring information to a disk-like slave medium having a chamfered outer periphery. There,
The outer diameter is substantially equal to the outer diameter of the slave medium,
Having burrs on the outer peripheral edge of the surface side,
The burr is characterized in that the inner surface of the burr is in a range facing the inclined surface of the chamfered portion on the outer periphery of the slave medium.
[0018]
In the second magnetic transfer master carrier of the present invention, in the case where the slave medium has a central hole whose peripheral edge is chamfered, the peripheral edge on the surface side is substantially equal to the diameter of the central hole of the slave medium. It is desirable that a burr at the periphery of the center hole is in a range where the inner surface of the burr faces a slope of the chamfered portion of the center hole of the slave medium.
[0019]
【The invention's effect】
According to the first magnetic transfer master carrier of the present invention, the outer peripheral edge on the surface side in close contact with the slave medium is chamfered, so that the slave medium is not damaged, and Good adhesion can be ensured.
[0020]
In the first magnetic transfer master carrier of the present invention, if the outer peripheral diameter is equal to or smaller than the outer peripheral diameter of the slave medium, the peripheral edge of the outer periphery of the slave medium is chamfered and dust is attached. The dust can be prevented from adhering to the surface of the carrier.
[0021]
Further, when the first magnetic transfer master carrier of the present invention has a center hole, if the peripheral edge of the center hole on the surface side in close contact with the slave medium is chamfered, the slave medium may be damaged. And good adhesion to the slave medium can be ensured.
[0022]
Further, when the slave medium has a center hole, it is desirable that the diameter of the center hole with the chamfered edge be equal to or larger than the diameter of the center hole of the slave medium.
[0023]
In the second magnetic transfer master carrier of the present invention, the outer peripheral burrs on the surface side in close contact with the slave medium are such that the inner surface of the burrs faces the slope of the chamfered portion on the outer periphery of the slave medium. Therefore, if the master carrier and the slave medium are in close contact with each other along the central axis, the slave medium is not damaged and good adhesion to the slave medium can be ensured. Furthermore, since the outer peripheral diameter is substantially equal to the outer peripheral diameter of the slave medium, it is possible to prevent the dust from adhering to the surface of the master carrier even when the chamfered portion of the outer peripheral edge of the slave medium is attached. Can do.
[0024]
When the slave medium has a central hole whose peripheral edge is chamfered, the second magnetic transfer master carrier of the present invention has a central hole having substantially the same diameter as the slave medium and is in close contact with the slave medium. Even if there is a burr on the peripheral edge of the central hole on the side, the burr on the peripheral edge of the central hole is in a range where the inner surface of the burr faces the slope of the chamfered portion of the central hole of the slave medium. If there is, if the master carrier and the slave medium are brought into close contact with each other along the central axis, the slave medium is not damaged and good adhesion to the slave medium can be ensured. Further, since the diameter of the center hole is substantially equal to the diameter of the center hole of the slave medium, even when dust adheres to the chamfered portion of the periphery of the center hole of the slave medium, the dust adheres to the surface of the master carrier. Can be prevented.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a plan view of a master carrier for magnetic transfer and a slave medium according to one embodiment of the present invention. In addition, a figure is a schematic diagram and has shown in the ratio different from an actual dimension (the same is true of the following figures).
[0026]
As shown in FIG. 1, the master carrier 1 is formed in a disc shape having a center hole 1a, and a transfer pattern 10 is formed in an annular region excluding an inner peripheral portion and an outer peripheral portion of one side (information carrying surface), The diameter of the center hole 1a is rma, and the diameter of the outer periphery 1b is rmb.
[0027]
When the transfer information is a servo signal, the transfer pattern 10 is concentrically formed in a narrow area extending in the radial direction (in the illustrated case, slightly curved) at equal intervals from the center of the master carrier 1. A servo pattern is formed.
[0028]
The slave medium 2 has a disk shape having a center hole 2a, and an annular area excluding the inner peripheral part and the outer peripheral part is set as a recording area 2c for recording and reproduction, and becomes a head movable area, and the transfer area is transferred to the recording area 2c. The pattern 10 is brought into close contact, and the corresponding magnetization pattern is transferred and recorded. The diameter of the central hole 2a of the slave medium 2 is rsa, and the diameter of the outer periphery 2b is rsb.
[0029]
FIG. 2 is a sectional view showing a state in which the master carrier 1 and the slave 2 according to the first embodiment of the present invention are brought into close contact with each other.
[0030]
The peripheral edge of the outer peripheral part and the inner peripheral part of the surface of the master carrier 1 that is in close contact with the slave medium is chamfered. Similarly, as for the slave medium 2, the outer peripheral part and the inner peripheral part of the periphery are all chamfered.
[0031]
The diameter rma of the central hole 1 a of the master carrier 1 is set to be equal to or larger than the diameter rsa of the central hole 2 a of the slave medium 2, and the outer peripheral diameter rmb of the master carrier 1 is set to be equal to or smaller than the outer peripheral diameter rsb of the slave medium 2. In addition, the difference La of the diameter of the inner peripheral part in both contact surfaces 5 = 0 to 2 mm, and the difference in diameter Lb of the outer peripheral part are set to about 0 to 500 μm. The C value of chamfering of the master carrier 1 is about 0.2 to 0.3. The chamfering angle is not limited to 45 °, and may be rounded.
[0032]
The master carrier 1 is provided with a fine uneven pattern (transfer pattern) 10 made of a magnetic layer on a substrate. As the substrate of the master carrier, nickel, silicon, quartz plate, glass, aluminum, alloy, ceramics, synthetic resin or the like is used. The formation of the concavo-convex pattern is performed by a stamper method or the like. The magnetic layer is formed by applying a magnetic material to a vacuum film-forming means such as a vacuum deposition method, a sputtering method, or an ion plating method, or a plating method. Almost the same master carrier is used for in-plane recording and perpendicular recording.
[0033]
The center hole 1a and the outer periphery 1b of the master carrier 1 are formed by punching. This punching process is performed by holding the master master before punching, on which the transfer pattern is formed, on the turntable of the punching device. The center of the turntable and the center position of the punching die coincide with each other with high accuracy. Then, the outermost peripheral edge of the transfer pattern of the master master is photographed with a CCD camera, and the coordinate position is detected by image processing. The master master is rotated by 90 degrees to detect the edge positions of the four transfer patterns. The center position of the transfer pattern is calculated from the detected position and compared with the center position of the turntable. If there is a deviation, the position of the master master is corrected, and this correction is repeated until the required accuracy is obtained. Thereafter, the punching die is operated to punch the center hole 1a and the outer periphery 1b.
[0034]
During this punching process, burrs are generated at the periphery of the center hole 1a and the outer periphery 1b. If there is a burr on the surface that is in close contact with the slave medium, it may cause poor contact with the slave medium and may cause damage to the slave medium. Even if there are no burrs, the surface of the slave medium may be damaged if the peripheral edge has a right angle or an acute angle. Therefore, as described above, the peripheral edges of the center hole 1a and the outer periphery 1b are chamfered.
[0035]
As the slave medium 2, a disk-shaped magnetic recording medium such as a hard disk having a magnetic layer formed on both sides or one side, a high-density flexible disk, or the like is used. The magnetic layer is composed of a coating type magnetic recording layer or a metal thin film type magnetic recording layer.
[0036]
A magnetic transfer apparatus (not shown) that performs magnetic transfer using the master carrier 1 includes a chamber-shaped transfer holder including a base holder and a pressing holder that can be moved toward and away from each other. Then, the master carrier 1 is accommodated and disposed on both sides of the slave medium 2 so as to be in close contact with each other, and a magnetic field for transfer is applied to perform magnetic transfer.
[0037]
On the pressing surface of the base holder, one master carrier 1 and slave medium 2 for transferring information such as servo signals to one surface of the slave medium 2 are held by suction or the like, and on the pressing surface of the pressing holder, the slave medium 2 The other master carrier 1 for transferring information such as servo signals to the other surface is held by suction or the like.
[0038]
The positioning of the master carrier 1 and the slave medium 2 with respect to the transfer holder is performed by attaching the center hole 1a of the master carrier 1 and the center hole 2a of the slave medium 2 to a positioning member installed at the center of the transfer holder. The outer periphery 1b may be positioned by being restricted by a positioning member.
[0039]
Support shafts project from the center positions of the back surfaces of the base holder and the press holder, are supported by the apparatus main body, and are linked to a rotation mechanism to be rotated during magnetic transfer.
[0040]
Further, the internal space of the transfer holder is depressurized to a predetermined degree of vacuum at the time of close contact to obtain the close contact force between the slave medium 2 and the master carrier 1, and the close contact surface is vented to improve the close contact, Compressed air is introduced when the atmosphere is released and when peeling. In addition to applying vacuum suction, the transfer holder may be mechanically pressurized from the outside in order to apply adhesion.
[0041]
In the case of in-plane recording, a magnetic field applying device that applies a magnetic field for transfer includes, for example, ring-type head electromagnets in which a coil is wound around a core having a gap extending in the radial direction and arranged on both sides of the transfer holder. A transfer magnetic field generated in parallel with the track direction is applied in the same direction on both sides. The transfer holder is rotated to apply a transfer magnetic field to the entire surface of the slave medium 2 and the master carrier 1. You may provide so that a magnetic field application apparatus may be rotationally moved. The magnetic field application device may be disposed only on one side, or the permanent magnet device may be disposed on both sides or one side. In the case of perpendicular recording, the magnetic field application apparatus arranges electromagnets or permanent magnets having different polarities on both sides of the transfer holder, and generates and applies a magnetic field for transfer in the vertical direction. In the case of applying a magnetic field partially, the entire surface is magnetically transferred by moving the transfer holder or moving the magnetic field.
[0042]
In the magnetic transfer process, the same master carrier 1 continuously performs magnetic transfer on a plurality of slave media 2, and the master carrier 1 is positioned and held on the transfer holder based on the inner diameter reference or the outer diameter reference. In the open state in which the transfer holder is separated, the slave medium 2 that has been initially magnetized in advance in one of the in-plane direction and the vertical direction is set with the center position aligned, and then the transfer holder is closed. Then, the internal space of the transfer holder is closed, and the slave medium 2 and the master carrier 1 are uniformly applied with close contact force.
[0043]
Thereafter, the magnetic field applying device is brought close to the transfer holder, and the transfer magnetic field is applied in the direction almost opposite to the initial magnetization by the magnetic field applying device while rotating the transfer holder. The applied magnetic field for transfer is sucked into the convex pattern of the magnetic material in close contact with the slave medium 2 in the transfer pattern of the master carrier 1, and in the case of in-plane recording, the initial magnetization of this part is not reversed and other parts In the case of perpendicular recording, the initial magnetization of this portion is reversed and the initial magnetization of the other portion is not reversed. As a result, the slave medium 2 is transferred with a magnetization pattern corresponding to the transfer pattern of the master carrier 1. To be recorded. After the magnetic transfer, the transfer holder is opened, the slave medium 2 after the magnetic transfer is taken out and carried out, the next new slave medium 2 is supplied, and the same magnetic transfer is repeated thereafter.
[0044]
According to the present embodiment, the peripheral edge of the inner and outer circumferences on the surface side to be brought into close contact with the slave medium of the master carrier 1 is chamfered. Therefore, when performing magnetic transfer in close contact with the slave medium 2, the surface of the slave medium 2 is applied. Sufficient adhesion can be ensured without causing scratches and no burrs. Further, the diameter rma of the central hole 1a of the master carrier 1 is set to be equal to or larger than the diameter rsa of the central hole 2a of the slave medium, and the diameter rmb of the outer periphery 1b is set to be equal to or smaller than the diameter rsb of the outer periphery 2b of the slave medium 2. The surface of the master carrier is prevented from being contaminated by dust adhering to the chamfered portion, and good and high-quality magnetic transfer can be continued for a plurality of slave media.
[0045]
In some cases, the master carrier 1 is brought into close contact with one side of the slave medium 2 to perform single-sided transfer, and double-sided sequential transfer is performed as necessary.
[0046]
FIGS. 3 to 5 are sectional views showing the magnetic transfer master carrier and the slave medium in close contact with each other according to another embodiment.
[0047]
The master carrier 11 and the slave medium 12 of the second embodiment shown in FIG. 3 do not have a central hole. The slave medium 12 is the same as the slave medium 2 of the above embodiment except that the slave medium 12 does not have a central hole. The master carrier 11 of the second embodiment is different from the master carrier 1 of the first embodiment except that the master carrier 11 does not have a central hole and the outer diameter of the master carrier 11 is larger than the outer diameter of the slave medium 12. It is the same. Since the peripheral edge 11c of the outer periphery 11b on the surface 15 side of the master carrier 11 that is in close contact with the slave medium 12 is chamfered, the surface of the slave medium 12 is not damaged during close contact and no poor contact occurs. Good magnetic transfer is possible. Note that the outer diameter of the master carrier 11 of the present embodiment is larger than the outer diameter of the slave medium 12, but the outer diameter of the master carrier 11 is more preferably less than or equal to the outer diameter of the slave medium 12. If the outer peripheral diameter of the master carrier 11 is equal to or smaller than the outer peripheral diameter of the slave medium 12, it is possible to prevent dust adhering to the chamfered portion 12 c on the outer periphery of the slave medium 12 from adhering to the surface of the master carrier 11.
[0048]
The master carrier 21 of the third embodiment shown in FIG. 4 is formed in a disk shape having a center hole 21a, and the first embodiment is applied to the annular region excluding the inner peripheral portion and the outer peripheral portion of one side (information carrying surface). As in the case of the embodiment, a transfer pattern is formed, the diameter of the center hole 21a is rma, and the diameter of the outer periphery 21b is rmb. On the other hand, the slave medium 22 is the same as the slave medium 2 shown in FIG. FIG. 4B is a partially enlarged view of FIG.
[0049]
The diameter rma of the center hole 21 a of the master carrier 21 is substantially equal to the diameter rsa of the center hole 22 a of the slave medium 22, and the outer diameter rmb of the master carrier 21 is also substantially equal to the outer diameter rsb of the slave medium 22.
[0050]
The master carrier 21 has burrs 21d on the outer peripheral portion and the inner peripheral portion on the side of the surface 25 in close contact with the slave medium 22. However, as shown in FIG. 4B, the burr 21 d at the periphery of the master carrier 21 is in a range where the inner surface 21 e of the burr 21 d faces the slope of the chamfered portion 22 c at the periphery of the slave medium 21. Therefore, the burr 21d does not cause a scratch on the surface of the slave medium 22 when the master carrier 21 and the slave medium 22 are in close contact with each other, and does not cause a close contact between them. Further, since the outer peripheral diameter and the center hole diameter of the master carrier 21 and the slave medium 22 are substantially equal, the dust adhering to the peripheral edge of the slave medium 22 does not adhere to the surface of the master carrier 21, and good magnetic transfer is continuously performed. Can be implemented.
[0051]
The master carrier 31 and the slave medium 32 in the fourth embodiment shown in FIG. 5 do not have a central hole. The slave medium 32 is the same as the slave medium 22 of the above embodiment except that the slave medium 32 does not have a central hole. The master carrier 31 according to the fourth embodiment is the same as the master carrier 21 according to the third embodiment except that the master carrier 31 is not provided with a central hole.
[0052]
There is a burr 31d on the periphery of the outer periphery 31b on the surface 35 side of the master carrier 31 in close contact with the slave medium 32. The inner surface 31e of the burr 31d faces the slope of the chamfered portion 32c on the periphery of the slave medium 21. It is in the range to do. Therefore, the burr 31d does not cause scratches on the surface of the slave medium 32 when the master carrier 31 and the slave medium 32 are in close contact with each other, and does not cause a close contact between them. Further, since the outer peripheral diameter and the center hole diameter of the master carrier 31 and the slave medium 32 are substantially equal, the dust adhering to the peripheral edge of the slave medium 32 does not adhere to the surface of the master carrier 31, and good magnetic transfer is continuously performed. Can be implemented.
[Brief description of the drawings]
FIG. 1 is a plan view of a magnetic transfer master carrier and slave medium according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of a magnetic transfer master carrier and slave medium according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view of a magnetic transfer master carrier and a slave medium according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view of a magnetic transfer master carrier and a slave medium according to a third embodiment of the present invention. FIG. 5 is a cross-sectional view of a magnetic transfer master carrier and a slave medium according to a fourth embodiment of the present invention.
1, 11, 21, 31 Master carrier 1a, 21a Center hole 1b, 11b, 21b of master carrier Periphery 1c, 11c of chamfer 5, 15, 25, 35 Contact surface (adhesion surface)
2, 12, 22, 32 Slave media 2a, 22a Central holes 2b, 12b, 22b of slave media Chamfer 2c, 12c, 22c, 32c Chamfered portion 10 Transfer pattern 21d, 31d Burr 21e, 31e Inner surface of burr

Claims (6)

A disk-shaped master carrier for magnetic transfer having a transfer pattern for transferring information to a disk-shaped slave medium on the surface,
A magnetic transfer master carrier, wherein the outer peripheral edge on the surface side is chamfered. 2. The master carrier for magnetic transfer according to claim 1, wherein the outer diameter is equal to or smaller than the outer diameter of the slave medium. Has a central hole,
3. The magnetic transfer master carrier according to claim 1, wherein a peripheral edge of the central hole on the surface side is chamfered. The slave medium has a central hole;
4. The magnetic transfer master carrier according to claim 3, wherein a diameter of the central hole whose peripheral edge is chamfered is equal to or larger than a diameter of the central hole of the slave medium. A disk-shaped master carrier for magnetic transfer comprising a transfer pattern on the surface for transferring information to a disk-shaped slave medium having a chamfered outer periphery,
The outer diameter is substantially equal to the outer diameter of the slave medium,
Having burrs on the outer peripheral edge of the surface side,
The master carrier for magnetic transfer, wherein the burr is in a range where the inner surface of the burr is opposed to the inclined surface of the chamfered portion of the outer periphery of the slave medium. The slave medium has a central hole whose peripheral edge is chamfered;
A central hole having a burr on the peripheral edge on the surface side, which is substantially equal to the diameter of the central hole of the slave medium;
6. The magnetic transfer for magnetic transfer according to claim 5, wherein the burr on the periphery of the center hole is in a range in which the inner surface of the burr faces the inclined surface of the chamfered portion of the center hole of the slave medium. Master carrier.

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