WO2004010429A1 - 記録媒体、記録媒体の製造方法、樹脂のスピンコート方法及び光磁気ディスク装置 - Google Patents
記録媒体、記録媒体の製造方法、樹脂のスピンコート方法及び光磁気ディスク装置 Download PDFInfo
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- WO2004010429A1 WO2004010429A1 PCT/JP2003/006588 JP0306588W WO2004010429A1 WO 2004010429 A1 WO2004010429 A1 WO 2004010429A1 JP 0306588 W JP0306588 W JP 0306588W WO 2004010429 A1 WO2004010429 A1 WO 2004010429A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
- G11B7/266—Sputtering or spin-coating layers
Definitions
- the present invention generally relates to a recording medium, and more particularly to a magneto-optical recording medium of a magnetic field modulation recording system. Background technology
- Conventional optical discs are of the type in which the content such as soft-to-air, etc., stored on the disc is printed on the opposite surface of the substrate through which a light beam for recording and reproduction passes, such as a compact disc (CD). And 3.5-inch magneto-optical disk (MO disk) or mini-disk (MD), which are not printed on the surface. Since the current MO disk or mini disk is used by being housed in a power cartridge case, the contents of the software stored in the disk are printed on the cartridge case.
- a magneto-optical disk device of a magnetic field modulation recording method such as a mini disk
- information is recorded by contacting or floating a magnetic head on the opposite surface of the light transmitting substrate.
- a magnetic head In the recording by, if the distance between the recording layer formed on the substrate surface and the magnetic head changes, the magnetic field intensity changes and normal recording cannot be performed. In addition, if the magnetic head collides with a convex portion on the substrate, the magnetic head may be damaged and recording and reproduction may not be performed. Therefore, in a magnetic recording device such as a magneto-optical disk device of a magnetic field modulation recording method, the disk surface must be flat.
- the surface unevenness is only the guide groove of about 100 nm formed on the optical disc substrate, which affects the flying characteristics of the magnetic head None.
- MO disk or mini disk is stored in the cartridge case, so there is no need to print on the recording surface of the medium.
- MO disk or mini disk It is also conceivable to apply this to a spindle motor with the naked.
- a magnetic disk drive a form in which a removable magnetic disk is mounted on a spindle motor and used is also conceivable. In such a case, it is necessary to perform printing on the surface of the recording layer in order to display the contents of the software stored on the disc.
- a magneto-optical disk or the like having a print on the recording layer surface side, a step is generated due to the thick print layer, and it is difficult to stably float the magnetic head and recording cannot be performed normally. Ming openness—
- an object of the present invention is to provide a recording medium that can perform normal recording and reproduction even when printing is performed on the recording layer surface side.
- Another object of the present invention is to provide a resin spin coating method capable of eliminating a step on a printing surface by uniformly spin coating the resin on a printing surface of a recording medium.
- a substrate a printing layer having a step between the first thickness provided on one surface of the substrate and the substrate, and coating the first layer on the one surface of the substrate And a resin protective layer having a second thickness greater than or equal to the first thickness.
- the second thickness is between 10 and 30 / im.
- the resin protective layer is formed by a spin coating method in which a resin is applied while rotating the substrate.
- a magnetic recording layer is provided on one side of the substrate, and a magnetic head is brought into contact with or floated on the resin protective layer to reverse the magnetic field while moving the magnetic head and the substrate relatively. And record.
- the printing layer is formed by screen printing, and the thickness of the printing layer is 5 to 15 / im, preferably 5 to: LO / im.
- the number of meshes of the screen used for screen printing is 350 to 450 inches, and the squeegee angle for screen printing is in the range of 60 to 90 degrees. is there.
- a transparent substrate a magnetic recording layer provided on one surface of the transparent substrate, a metal layer provided on the magnetic recording layer, and a metal layer provided on the metal layer A printing layer having a first thickness, and a coating layer applied on the one surface of the transparent substrate. And a resin protective layer having a second thickness greater than or equal to the first thickness.
- the second thickness is between 10 and 30 ⁇ m.
- the resin protective layer is formed by a spin coating method in which a resin is applied while rotating the substrate. Information is recorded by irradiating a light beam from the other side of the substrate, contacting or floating the magnetic head on the resin protective layer, and reversing the magnetic field while moving the magnetic head and the substrate relative to each other. Do it.
- a transparent substrate a transparent substrate; a magnetic recording layer provided on one surface of the transparent substrate; a metal layer provided on the magnetic recording layer; A first resin protection layer provided, a printing layer having a step between the first thickness provided on the first resin protection layer and the first resin protection layer, and the first resin protection layer A second resin protective layer having a second thickness greater than or equal to the first thickness provided above, and a total thickness of the first resin protective layer, the print layer, and the second resin protective layer. Is less than or equal to 30 ⁇ m.
- a method of spin-coating a resin on a printing surface having a print while rotating the substrate wherein the resin is rotated while rotating the substrate at a first speed.
- a resin spin coating method is provided.
- the step clearance step is within one second.
- Figure 1 shows the spin coating method for the resin of the comparative example
- FIG. 2 is a diagram showing a spin coating method of the resin of the present invention.
- FIG. 3 is a cross-sectional view of a recording medium in which a resin is applied to a printing surface by the spin coating method of the comparative example shown in FIG. 1;
- Fig. 4 is a partially cutaway plan view
- Fig. 5 shows a book coated with resin on the printed surface by the spin coating method of the present invention shown in Fig. 2.
- Fig. 6 is a partially cutaway plan view
- FIG. 7 is a schematic sectional view showing a laminated structure of the magneto-optical disk according to the first embodiment
- FIG. 8 is an enlarged sectional view of an end portion of a printed layer
- FIG. 9 is a partially enlarged sectional view of the first embodiment shown in FIG. 7;
- Figure 10 is an illustration of the screen printing method
- Fig. 11 is a graph showing the relationship between the number of screen meshes and the thickness of the printing layer
- Fig. 12 is a graph showing the relationship between the angle of the squeegee and the thickness of the printing layer;
- FIG. 13 is a schematic sectional view showing a laminated structure of a magneto-optical disk according to a modification of the first embodiment
- Figure 14 is a graph showing the relationship between the thickness of the resin protective film formed on the printing surface and the required magnetic field
- FIG. 15 is a sectional view of a magneto-optical disk according to the second embodiment of the present invention.
- Figure 16 is a partially cutaway plan view
- FIG. 17 is a sectional view of a magnetic disk according to the third embodiment of the present invention.
- Figure 18 is a partially cutaway plan view
- FIG. 19 is a schematic sectional view showing the laminated structure of the magnetic disk according to the third embodiment
- FIGS. 20A to 20E are diagrams showing another embodiment of the resin coating method
- FIG. 21A And FIG. 21B is a view showing still another embodiment of the resin spin coating method
- Figure 22 is an illustration of the offset printing method
- FIG. 23 is a schematic configuration diagram of a magneto-optical disk device. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows a resin spin coating method of a comparative example
- FIG. 2 shows a resin spin coating method for realizing the present invention
- the spin coating method of the comparative example shown in Fig. 1 is a two-step coating method in which an organic resin is applied on the periphery of a rotating substrate, and then the rotation speed is instantaneously increased and the organic resin is applied over the entire outer periphery. Is the way. That is, in the first stage at low speed, the resin Apply the resin to the inner circumference, and apply the resin to the entire surface of the substrate in a second step at a higher speed. Alternatively, in the case of a resin containing volatile components, the resin is also dried in the second stage at a high speed.
- the organic resin protective layer 8 becomes thinner than the printed layer 6 formed on the substrate 4.
- a radial thickness unevenness 10 occurs on the printing layer and the outer peripheral side of the printing layer as shown in FIG. 4, or the thickness of the resin protective layer 8 becomes uneven.
- Such a film thickness unevenness 10 is a recording method that employs a recording method in which a magnetic head is brought into contact with or floated on the printing surface side, and the magnetic field is reversed while the substrate and the magnetic head are relatively moved to perform recording. Fatal defects in media.
- the resin spin coating method of the present invention applies an organic resin to the inner periphery of a recording medium having a rotating printing layer, and then instantaneously increases the rotation speed to remove the organic resin.
- This is a spin coating method in which an organic resin is applied to the entire surface in the outer circumferential direction of the recording medium, and furthermore, the recording medium is rotated at high speed to shake off the organic resin in a short time.
- the resin spin coating method of the present invention includes a resin coating step of coating the resin on the inner peripheral side of the substrate while rotating the substrate at a first speed, and a second step of rotating the substrate at a speed higher than the first speed.
- this resin spin coating method it is possible to suppress radial thickness unevenness and film thickness nonuniformity occurring on the print layer and the outer peripheral side of the print layer.
- Table 2 shows the relationship between the step eliminating step time and the unevenness and thickness of the resin protective layer.
- the step to eliminate the step is longer than 1.0 second, the thickness of the resin protective layer will be less than 10 m, and a step will occur with the print layer of about 10 ⁇ m thickness. .
- the rotation speed of the magneto-optical disk was set to 500 rpm. According to the above experiment, the step of eliminating the step is performed by rotating the magneto-optical disk at a speed of 400 rpm or more, whereby the radial thickness unevenness generated on the print layer and the outer peripheral side of the print layer is reduced.
- Non-uniformity of the film thickness can be suppressed, and the magneto-optical disk 2A of the first embodiment of the present invention having a flat resin protective layer as shown in the cross-sectional view of FIG. 5 can be realized.
- the number of rotations and the number of rotations switching are not limited to the embodiment, and can be changed as appropriate. The examples illustrate the case where more efficient and effective results were obtained from the process time and the film condition.
- reference numeral 4 denotes a transparent substrate of the magneto-optical disk 2A.
- a recording layer or the like (not shown) is formed on the transparent substrate 4, and a print layer 6 is provided on the surface on the recording layer side.
- the height of the printing layer 6 is about 10 ⁇ m.
- Numeral 8 denotes a resin protective layer which completely covers the printed layer 6 and its surface is flat.
- FIG. 6 is a partially broken plan view of the magneto-optical disk 2A of the first embodiment shown in FIG.
- the product name SD 7 (Viscosity 45 mpa ⁇ s).
- FIG. 7 there is shown a schematic sectional view showing a laminated structure of the magneto-optical disk 2A of the first embodiment.
- a base dielectric layer 12 of SiN On the transparent substrate 4, a base dielectric layer 12 of SiN, a recording layer 14 of TbFeCo-based material, a recording auxiliary layer 16 of GdFeCo-based material 16, Si
- the N overcoat layer 18, the metal layer 20 including A1, and the resin protective layer 22 are laminated in this order.
- a printed layer 6 is provided on the resin protective layer 22, and the printed layer 6 is covered with the resin protective layer 8.
- the magneto-optical disk 2A of the present embodiment is a normal type magneto-optical recording medium.
- the magneto-optical disk 2A is a magneto-optical disk device that performs magnetic field modulation recording by contacting or floating a magnetic head on the resin protective layer 8 while irradiating a predetermined level of laser beam from the substrate 4 side. It is particularly effective when applied to ⁇ .
- FIG. 8 shows an enlarged cross-sectional view of the end portion of the printing layer. When the printing layer 6 is formed by screen printing, a projection 6 a is formed at an end of the printing layer 6. In the present embodiment, both the maximum thickness Tmax and the minimum thickness Tmin of the printing layer 6 are preferably 5 to 15 / m. More preferably, it is 5 to 10 / im.
- FIG. 9 is a partially enlarged sectional view of the first embodiment shown in FIG.
- the printing layer 6 has a first thickness T 1
- the resin protective layer 8 has a second thickness T 2 that is equal to or greater than the first thickness T 1.
- the total thickness of the resin protective layer 22, the print layer 6, and the resin protective layer 8 is preferably 30 ⁇ m or less. More preferably, this total thickness is less than 20 ⁇ m.
- the total thickness is equal to the sum of the thicknesses of the resin protective layer 20 and the resin protective layer 8 because the resin protective layer 8 completely covers the print layer 6.
- the outline of the method for manufacturing the magneto-optical disk 2A of the first embodiment shown in FIG. 7 is as follows.
- the base dielectric layer 12, recording layer 14, recording auxiliary layer 16, SiN overcoat layer 18, and metal layer 20 are sequentially formed on the substrate 4 by a sputtering apparatus, and then the substrate is formed. Remove 4 from the sputtering device and attach it to the spin coater.
- a UV curable resin is applied on the metal layer 20 by spin coating.
- the UV-cured resin used was DAIKYRIA SD-170 from Dainippon Ink Co., Ltd. After the application, the resin was cured by irradiating ultraviolet rays to form a resin protective layer 22 having a thickness of 4 ⁇ m.
- a printing layer 6 was formed by a screen printing method as shown in FIG.
- 15 is a screen and 17 is a screen. This is Keiji.
- the printing layer 6 is formed, for example, in a test pattern as shown in FIG. By changing the number of meshes on the screen 15 and the angle of the squeegee 17, several types of samples were prepared, and the thickness of the print layer 6 was measured.
- the ink used for printing is Daicure SSD, a product name of Dainippon Ink Corporation.
- the substrate 4 was mounted on a spin coater, and a resin protective layer 8 for smoothing the surface was formed.
- the resin used is a trade name of SD 715 manufactured by Dainippon Ink Co., Ltd.
- the spin coat is applied at the three rotation speeds shown in FIG. 2 and the third rotation speed is set to 400 rpm or more, so that the resin protective layer 8 completely covers the printing layer 6.
- the step at the end of the print layer 6 can be eliminated.
- Table 2 when the thickness of the printing layer 6 is 1 ⁇ or more, the surface can be flattened by setting the step eliminating step time to 1.0 second or less.
- the resin protection layer 8 for smoothing the surface can be made thin by extending the step removing step time accordingly.
- the thickness of the resin protection layer 8 can be set to 8 ⁇ m by setting the step removing step time to 2 seconds. After applying the resin protective layer 8 for smoothing the surface, the resin protective layer 8 is cured by irradiating ultraviolet rays.
- - Figure 11 shows the relationship between the number of meshes on the screen 15 and the thickness of the print layer 6. As is clear from FIG. 11, it is possible to reduce the thickness of the print layer 6 by increasing the number of meshes on the screen. By setting the number of screen meshes to 350 / inch or more, the thickness of the print layer 6 can be reduced to 15 # m or less.
- the thickness of the printing layer 6 is preferably 5 to 15 / im, more preferably 5 to: L O / im.
- the number of meshes on the screen 15 is preferably 350 to 450 inches.
- the squeegee angle was 70 degrees.
- FIG. 12 shows the relationship between the squeegee angle and the thickness of the print layer 6.
- the print layer 6 can be made thinner by increasing the angle of the squeegee.
- the thickness of the print layer 6 can be set to 15 / zm or less. Therefore, the squeegee angle is preferably in the range of 60 to 90 degrees.
- the mesh number of the screen 15 was set to 420 / inch.
- the thickness of the resin protection layer 22 shown in FIG. 9 will be 4 ⁇ m.
- the total thickness can be reduced to 20 ⁇ m or less by adjusting the step clearance time during spin coating of the slipping resin protective layer 8.
- FIG. 13 is a schematic cross-sectional view showing a laminated structure of a magneto-optical disk 2A ′ according to a modification of the first embodiment.
- an underlying dielectric layer 12 composed of SiN
- a reproducing layer 24 composed of a GdFeCo-based material
- a nonmagnetic layer 26 composed of SiN
- a TbFeCo-based material Recording layers 28 made of a material are stacked in this order.
- a metal layer 20 including a SiN overcoat layer 18 and A 1 is laminated on the recording layer 28.
- a printing layer 6 is provided on the metal layer 20, and the printing layer 6 is covered with a resin protection layer 8.
- the magneto-optical disk 2A 'of this embodiment has a CAD (center-aperture-detection) type magnetic induction superconductor in which the recording marks of the recording layer 28 are transferred to the reproducing layer 24 by magnetostatic coupling.
- Resolution (MSR) medium The reproducing layer 24 has a larger Kerr rotation angle and a smaller holding power at room temperature than the recording layer 28.
- the recording layer 2 8, the reproduction layer 2 is 4 compared to the relatively Kerr rotation angle of the c the present embodiment the holding force is large at room temperature rather small magneto-optical disc 2 A 'also from the transparent substrate 4 side
- the present invention is particularly effective when applied to a magneto-optical disk device which performs magnetic field modulation recording by irradiating a magnetic head on the resin protective layer 8 while irradiating a laser beam having a predetermined power.
- the layer constitution and the material are not limited to the examples and can be changed as appropriate.
- FIG. 14 shows the relationship between the thickness of the resin protective layer and the magnetic field required to record information on the magneto-optical disk 2A of the first embodiment having the TbFeCo recording layer.
- the magnetic field required for recording increases when the thickness of the resin protective layer is large, and when the film thickness is more than 30 ⁇ m, a magnetic field of more than 250 eS (O e) is required.
- O e magnetic field of more than 250 eS
- Generating a magnetic field of more than 250 oersteds (O e) involves problems such as an increase in power consumption and an increase in the temperature of the magneto-optical disk device. M m or less is preferred.
- the thickness of the resin protective layer is required to be 10 ⁇ m or more from the relationship with the thickness of the print layer, so the thickness of the resin protective layer should be within the range of 10 zm to 30 / im. preferable.
- the horizontal axis of FIG. 14 is the thickness of the resin protective layer 8 in the configuration of FIG. In the configuration of FIG. 7, it is the total thickness of the resin protective layer 22 and the surface smoothing resin protective layer 8.
- the linear velocity increases to improve the recording / reproducing speed, the current switching speed to the magnetic head increases, and The resulting magnetic field decreases.
- mechanical characteristics such as warpage of the substrate deteriorate, the floating of the magnetic head becomes unstable and the effective magnetic field decreases.
- the total thickness described above may be set to 20 ⁇ m or less.
- FIG. 15 is a sectional view of a magneto-optical disk according to the second embodiment of the present invention
- FIG. 16 is a partially broken plan view thereof.
- the resin protective layer 8 may have a gentle curved surface as long as the surface is not completely flat, as long as it does not hinder recording and reproduction of the magnetic head.
- FIG. 17 is a sectional view of a third embodiment of the present invention in which the present invention is applied to a magnetic disk.
- C FIG. 18 is a partially cutaway plan view of the magnetic disk 2C of FIG.
- a magnetic recording layer and the like (not shown) are formed on the substrate 4, and a printing layer 6 is provided on the surface on the magnetic recording layer side.
- the printing layer 6 is covered with a resin protective layer 8. Further, a lubricant 30 for reducing friction is applied on the resin protective layer 8.
- FIG. 19 is a schematic sectional view showing a laminated structure of a magnetic disk 2C according to the third embodiment of the present invention.
- an adhesion layer 32 made of Cr or the like and a nonmagnetic metal layer 34 made of NiP or the like are laminated.
- an underlayer 36 mainly composed of Cr is laminated, and on the underlayer 36, an intermediate layer 38 is laminated.
- One or more Co alloy magnetic layers 40 are laminated on the intermediate layer 38, and a protective layer 42 is laminated on the magnetic layer 40.
- the protective layer 42 has a function of preventing wear and corrosion of the Co alloy magnetic layer 40.
- a printed layer 6 is provided on the protective layer 42.
- the printed layer 6 is covered with a resin protective layer 8. Further, a lubricant 30 is applied on the resin protective layer 8.
- the layer configuration and the material are not limited to the examples and can be appropriately changed.
- a lubricant is applied on the resin protective layer of the magnetic disk.
- the lubricant is applied on the resin protective layer 8 of the magneto-optical disk shown in FIGS. 5 and 15. You may. Even if a step in the printed layer as shown in FIG. 3 occurs, the defect is repaired by adjusting the coating position and the rotation condition of the resin, and coating the organic resin again by the spin coating method of the present invention. It is possible.
- the substrate 4 is formed by sequentially forming a SiN, a recording layer, a recording auxiliary layer, and a SiN, A1 on the substrate 4. Take it out of the film forming equipment and attach it to the spin coater. A1 layer is coated with UV curable resin by spin coating.
- the ultraviolet curable resin Dycure Co., Ltd. SD-170, manufactured by Dainippon Ink Co., Ltd. was used.
- the resin was cured by irradiating ultraviolet rays to form a resin protective layer having a thickness of about 4 / m.
- the substrate 4 was mounted on a screen printing apparatus, and a printing layer 6 was formed by the method shown in FIG.
- the printing layer 6 is formed, for example, in a test pattern as shown in FIG.
- the ink used for printing is Daicure SSD manufactured by Dai Nippon Ink.
- a method of improving the step of the printing layer 6 will be described.
- an ultraviolet curing resin 7 is applied to the inner peripheral side of the substrate 4 over one round.
- an upper force par 9 transparent to ultraviolet rays is placed on the ultraviolet curing resin 7.
- the upper force par 9 is made of a material having a very good releasability from the ultraviolet curable resin.
- a trade name of SA1002S manufactured by Mitsubishi Rayon Co., Ltd. may be used as the ultraviolet curable resin 7, and a trade name manufactured by JSR Corporation may be used for the upper cover 9.
- the UV curable resin 7 may be SA1002S (trade name, also manufactured by Mitsubishi Rayon Co., Ltd.), and a glass substrate may be used for the upper cover 9.
- the substrate 4 is rotated at a high speed with the upper cover 9 placed by a spin coating device, and the ultraviolet curing resin 7 is applied to the entire substrate surface.
- the rotation speed during viscosity and spin operation of the c ultraviolet curable resin 7 can be nearly completely planarize the substrate surface by utilizing the upper portion cover one 9, adjusting the thickness of the resin protective layer 8 It is also possible.
- FIG. 20D after the ultraviolet curable resin 7 is completely cured, the upper force par 9 is removed. By using this method, the printed layer 6 is completely reinforced by the resin protective layer 8 and the surface of the resin protective layer 8 is flattened. Can be.
- the UV-curing resin 11 used for improving slidability used was Desolite (KZ7325C) (trade name) manufactured by JSR Corporation.
- an ultraviolet curable resin 7 is applied over the entire inner circumference side of the substrate 4 and then the substrate 4 is spun at high speed by a spin coater. Then, the ultraviolet curable resin 7 is applied to the entire surface of the substrate 4 and excess resin is discharged. Thereafter, as shown in FIG. 21B, the upper cover 9 may be mounted on the ultraviolet-curable resin 7, and the surface flattening step and the ultraviolet irradiation step may be performed.
- the present invention that eliminates the steps of the printed layer formed on the substrate surface is naturally applicable not only to screen printing but also to, for example, offset printing. An outline of the offset printing will be described with reference to FIG.
- the ink 45 is transferred from the ink roller 44 to the plate cylinder 46, the ink of the plate cylinder 46 is transferred to the blanket 48 made of rubber or the like, and the blanket 48 is transferred to the surface of the substrate 4. Transfer ink 4 5.
- the ink is transferred to paper or the like via the blanket 48, so that it is possible to form a thinner print layer than in screen printing, but the same as in screen printing A step occurs at the end of the printing layer.
- the present invention is not limited to only screen printing and offset printing, and a step occurs in electrophotographic printing and the like, so that the present invention can be generally applied to printing layers formed by other printing methods. is there.
- the disk is used as an example, but the present invention is also applicable to a card-shaped or tape-shaped storage medium. Further, in each of the embodiments, an example has been described in which the magnetic head faces the medium surface on the printing surface side, but the present invention can also be applied to a case where the optical head also faces the same.
- FIG. 23 there is shown a schematic configuration diagram of a magneto-optical disk device suitable for driving the magneto-optical disk of the present invention.
- a spindle motor 52 is provided in the housing 50, and a magneto-optical (MO) cartridge is provided through an inlet door 54.
- MO magneto-optical
- a carriage 60 is provided below the loaded magneto-optical disk 58 so as to be movable in a direction crossing the track of the medium by a voice coil motor (VCM).
- VCM voice coil motor
- an objective lens 62 and a beam launch prism 64 are mounted on the carriage 60.
- a magnetic head 68 is provided on the opposite side of the magneto-optical disk 58 from the objective lens 62 so as to face the objective lens 62.
- the magnetic head 68 is supported by a suspension 66 attached to the carriage 60.
- the laser beam from the laser diode 72 provided in the fixed optical system 70 is reflected by the beam rising prism 64 and is incident on the objective lens 62, and the laser beam spots on the recording surface of the magneto-optical disk 58. Focus on At the same time, the magnetic head 68 is driven by modulating it with the information to be recorded, and the information is written on the magneto-optical disk 58.
- the movement of the objective lens 62 in the optical axis direction is controlled by a focus actuator (not shown), and the track lens is moved across the medium track by a track actuator. For example, the objective lens 62 moves within a range of several 10 tracks. be able to.
- a resin protective layer having a thickness greater than the thickness of the printing layer is applied, so that the surface is flushed.
- a magneto-optical recording medium suitable for a magnetic field modulation recording method it is possible to provide a magneto-optical recording medium suitable for a magnetic field modulation recording method.
- the application of the present invention is not limited to a magneto-optical recording medium, and the same effects can be obtained by applying the present invention to a magnetic recording medium having a printed layer on the surface.
- the entire surface of the recording medium becomes flat, the distance between the recording layer and the magnetic head can be kept constant by keeping the flying balance and contact state constant, and the signal quality of recording and reproduction can be made uniform. Good signal quality results in printing on high-density media. Further, since the entire surface of the recording medium becomes flat, the floating balance and contact state of the head can be controlled stably or almost constant. Therefore, the head is not damaged by the undulation of the medium surface. That is, the medium of the present invention Media compatibility and reliability of the device can be improved for the device to which it is applied.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004522715A JPWO2004010429A1 (ja) | 2002-07-18 | 2003-05-27 | 記録媒体、記録媒体の製造方法、樹脂のスピンコート方法及び光磁気ディスク装置 |
AU2003241794A AU2003241794A1 (en) | 2002-07-18 | 2003-05-27 | Recording medium, method for manufacturing recording medium, resin spin-coating method, and magneto-optical disk device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPPCT/JP02/07298 | 2002-07-18 | ||
PCT/JP2002/007298 WO2004010428A1 (ja) | 2002-07-18 | 2002-07-18 | 記録媒体、樹脂のスピンコート方法及び光磁気ディスク装置 |
Publications (1)
Publication Number | Publication Date |
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WO2004010429A1 true WO2004010429A1 (ja) | 2004-01-29 |
Family
ID=30490754
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/007298 WO2004010428A1 (ja) | 2002-07-18 | 2002-07-18 | 記録媒体、樹脂のスピンコート方法及び光磁気ディスク装置 |
PCT/JP2003/006588 WO2004010429A1 (ja) | 2002-07-18 | 2003-05-27 | 記録媒体、記録媒体の製造方法、樹脂のスピンコート方法及び光磁気ディスク装置 |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2002/007298 WO2004010428A1 (ja) | 2002-07-18 | 2002-07-18 | 記録媒体、樹脂のスピンコート方法及び光磁気ディスク装置 |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPWO2004010429A1 (ja) |
AU (2) | AU2002368100A1 (ja) |
WO (2) | WO2004010428A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2003242420A1 (en) | 2003-05-23 | 2004-12-13 | Fujitsu Limited | Recording medium and production method therefor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0536145A (ja) * | 1991-07-26 | 1993-02-12 | Kenwood Corp | 光磁気デイスク装置 |
JPH0744924A (ja) * | 1993-07-30 | 1995-02-14 | Matsushita Electric Ind Co Ltd | 情報記録媒体 |
JPH09330535A (ja) * | 1996-06-11 | 1997-12-22 | Kao Corp | ディスクのレーベル印刷方法及び装置 |
JP2001110093A (ja) * | 1999-10-14 | 2001-04-20 | Sony Corp | 光記録媒体 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0670861B2 (ja) * | 1984-03-01 | 1994-09-07 | 松下電器産業株式会社 | 光学式ディスク保護膜塗付方法およびディスク |
JP2502562B2 (ja) * | 1987-02-17 | 1996-05-29 | 日立マクセル株式会社 | 光デイスク保護膜のコ−テイング方法 |
JP3015204B2 (ja) * | 1992-06-19 | 2000-03-06 | シャープ株式会社 | 光ディスクの製造方法 |
JP3050000B2 (ja) * | 1993-07-28 | 2000-06-05 | 松下電器産業株式会社 | 情報記録媒体 |
JPH07114748A (ja) * | 1993-10-18 | 1995-05-02 | Ricoh Co Ltd | 光ディスク |
-
2002
- 2002-07-18 WO PCT/JP2002/007298 patent/WO2004010428A1/ja active Application Filing
- 2002-07-18 AU AU2002368100A patent/AU2002368100A1/en not_active Abandoned
-
2003
- 2003-05-27 WO PCT/JP2003/006588 patent/WO2004010429A1/ja active Application Filing
- 2003-05-27 AU AU2003241794A patent/AU2003241794A1/en not_active Abandoned
- 2003-05-27 JP JP2004522715A patent/JPWO2004010429A1/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0536145A (ja) * | 1991-07-26 | 1993-02-12 | Kenwood Corp | 光磁気デイスク装置 |
JPH0744924A (ja) * | 1993-07-30 | 1995-02-14 | Matsushita Electric Ind Co Ltd | 情報記録媒体 |
JPH09330535A (ja) * | 1996-06-11 | 1997-12-22 | Kao Corp | ディスクのレーベル印刷方法及び装置 |
JP2001110093A (ja) * | 1999-10-14 | 2001-04-20 | Sony Corp | 光記録媒体 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2004010429A1 (ja) | 2005-11-17 |
AU2003241794A1 (en) | 2004-02-09 |
AU2002368100A1 (en) | 2004-02-09 |
WO2004010428A1 (ja) | 2004-01-29 |
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