WO2005008636A1 - 磁気記録媒体の製造方法、磁気記録媒体用スタンパーおよび磁気記録媒体用中間体 - Google Patents
磁気記録媒体の製造方法、磁気記録媒体用スタンパーおよび磁気記録媒体用中間体 Download PDFInfo
- Publication number
- WO2005008636A1 WO2005008636A1 PCT/JP2004/010299 JP2004010299W WO2005008636A1 WO 2005008636 A1 WO2005008636 A1 WO 2005008636A1 JP 2004010299 W JP2004010299 W JP 2004010299W WO 2005008636 A1 WO2005008636 A1 WO 2005008636A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- recording medium
- magnetic recording
- center
- stamper
- layer
- Prior art date
Links
- 238000000034 method Methods 0.000 title abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 79
- 239000000463 material Substances 0.000 claims description 25
- 239000011347 resin Substances 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 13
- 239000000758 substrate Substances 0.000 abstract description 64
- 239000011521 glass Substances 0.000 abstract description 53
- 229910052705 radium Inorganic materials 0.000 abstract 1
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 111
- 239000011241 protective layer Substances 0.000 description 24
- 238000005530 etching Methods 0.000 description 18
- 239000007789 gas Substances 0.000 description 17
- 239000002184 metal Substances 0.000 description 15
- 229910052751 metal Inorganic materials 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 238000001020 plasma etching Methods 0.000 description 8
- 238000004544 sputter deposition Methods 0.000 description 8
- 238000001746 injection moulding Methods 0.000 description 6
- 238000005498 polishing Methods 0.000 description 5
- 238000010894 electron beam technology Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 230000000994 depressogenic effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- 238000004528 spin coating Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910019222 CoCrPt Inorganic materials 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- DTJAVSFDAWLDHQ-UHFFFAOYSA-N [Cr].[Co].[Pt] Chemical compound [Cr].[Co].[Pt] DTJAVSFDAWLDHQ-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/855—Coating only part of a support with a magnetic layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/0002—Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
Definitions
- the present invention relates to a magnetic recording medium stamper, in which a stamper for a magnetic recording medium is superimposed on an intermediate for a magnetic recording medium on which a resin layer is formed, and an uneven pattern is transferred to the resin layer.
- the present invention relates to a magnetic recording medium manufacturing method for manufacturing a discrete track type magnetic recording medium by forming a concave portion in a magnetic layer of an intermediate, a stamper for a magnetic recording medium, and an intermediate for a magnetic recording medium.
- the heating stage (21) and the press mechanism (22) are controlled. Heat the disk-shaped substrate (D) and mold (24).
- the press mechanism (22) presses (presses) the mold (24) toward the disk-shaped substrate (D).
- the convex portion (24p) of the mold (24) is pushed into the resist layer (R) on the disk-shaped substrate (D), and the resist material enters the concave portion of the mold (24).
- the press mechanism (22) is moved to the mold (24). Is separated from the resist layer (R). Thereby, the concave / convex pattern of the mold (24) is transferred to the resist layer (R), and a resist pattern (mask) is formed on the disk-shaped substrate (D).
- the entire resist pattern on the disk-shaped substrate (D) is subjected to oxygen plasma treatment.
- the magnetic layer (F) of the disk-shaped substrate (D) is exposed from the bottom surface of the concave portion in the resist pattern.
- a metal is vapor-deposited on the top surface of the protrusion in the resist pattern and on the surface of the magnetic layer (F) (bottom surface of the recess) exposed from the bottom surface of the recess in the resist pattern to form a metal layer (M).
- the metal layer (M) formed at the tip of the protrusion in the resist pattern is removed together with the resist material by a lift-off process.
- the metal layer (M) formed on the surface of the magnetic layer (F) remains on the disk-shaped substrate (D) to form a metal pattern.
- a reactive ion etching process is performed on the magnetic layer (F) using the metal pattern as a mask.
- the magnetic layer (F) in a portion not covered by the mask is removed, and a plurality of grooves are formed concentrically in the magnetic layer (F).
- the metal pattern remaining on the magnetic layer (F) is removed by performing a reactive ion etching treatment.
- the inventors have studied the method of manufacturing the discrete track medium proposed by the applicant, and have found the following problems to be improved.
- the disk-shaped substrate (D) is fixed to the heating stage (21), and the press mechanism (22) is fixed to the press mechanism (22) with the mold (24) fixed.
- each track for recording the recording data is formed at the time of manufacturing.
- the center of rotation of the discrete track medium during recording and reproduction of recording data (that is, the center of the discrete track medium). )
- the center of each track must be formed in the magnetic layer (F). Therefore, a resist pattern for forming a groove in the magnetic layer (F) of the disk-shaped substrate (D) is required.
- the applicant fixes the center of the disk-shaped base material (D) in a state where it coincides with the reference point of the heating stage (21), and fixes the center of the mold (24) to the press mechanism (22). ), And fixed so that both reference points of the heating stage (21) and the press mechanism (22) coincide in the thickness direction of the disc-shaped substrate (D).
- the eccentricity of the resist pattern (mask) with respect to the center of the disk-shaped substrate (D) (the concavo-convex pattern transferred to the resist layer (R)) Eccentricity with respect to the disk-shaped substrate (D)).
- the coordinates of three arbitrary points on the outer edge of the disk-shaped substrate (D) are measured using a factory microscope or the like, and based on the measurement results, the disk-shaped substrate (D) is measured. It is necessary to calculate and specify the center of.
- the mold (24) as an example, the coordinates of three points on an arbitrary convex portion (24p) in the concave-convex pattern are measured, and the center of the mold (24) is calculated based on the measurement results. Need to be identified. Therefore, since the measuring operation and the arithmetic processing are complicated, the manufacturing method proposed by the applicant has a problem that it is difficult to improve the manufacturing efficiency of the discrete track medium.
- the present invention has been made to solve the above-described problems, and a method of manufacturing a magnetic recording medium, a stamper for a magnetic recording medium, and an intermediate for a magnetic recording medium capable of improving the manufacturing efficiency. Its main purpose is to provide the body.
- a method for manufacturing a magnetic recording medium according to the present invention is to form a resin layer on a plate-like intermediate for a magnetic recording medium having a magnetic layer formed on a supporting base material, and to provide an intermediate for the magnetic recording medium.
- the center of the magnetic recording medium is overlapped with the magnetic recording medium intermediate so that one center is aligned with the thickness direction of the magnetic recording medium intermediate, and the magnetic recording medium stamper is overlapped with the resin layer.
- a concave / convex pattern is transferred, and a concave portion is formed in the magnetic layer of the magnetic recording medium intermediate using the resin layer to which the concave / convex pattern has been transferred, thereby manufacturing a discrete track type magnetic recording medium.
- adjacent data recording tracks are magnetically separated from each other by a plurality of concentrically formed grooves (Gnorebes) or spirally formed grooves.
- Ganorebes concentrically formed grooves
- the data recording area is divided into mesh or dots (each data recording track is magnetically separated in the longitudinal direction as well).
- a so-called patterned medium in which the formed data recording portion (magnetic portion) is isolated in an island shape (island shape) is also included.
- stamper for a magnetic recording medium an uneven pattern for manufacturing a discrete track type magnetic recording medium is formed, and a stamper-center identifying mark capable of identifying a center thereof is formed. Have been.
- the stamper for the magnetic recording medium may have one of a convex portion protruding at a part of a central portion thereof and the magnetic recording medium stamper a concave portion having a part of a central portion depressed. It is preferable to form a center specifying mark.
- the intermediate for a magnetic recording medium according to the present invention has a magnetic layer formed on a supporting substrate so that a discrete track type magnetic recording medium can be manufactured and the center of the magnetic layer can be identified. Marks are formed.
- the center of the stamper specified based on the stamper center specifying mark formed on the stamper for the magnetic recording medium and the center of the intermediate of the intermediate for the magnetic recording medium Are transferred so that they match in the thickness direction of the intermediate for the magnetic recording medium, and the uneven pattern of the stamper for the magnetic recording medium is transferred to the resin layer.
- the center of the stamper can be specified in a short time and the force can be specified reliably and easily. Therefore, the magnetic recording medium stamper can be positioned with respect to the magnetic recording medium manufacturing apparatus (imprint apparatus) in a short time, so that the manufacturing efficiency of the discrete track medium can be sufficiently improved.
- the method for manufacturing a magnetic recording medium of the present invention by specifying the center of the intermediate body based on the mark for specifying the center of the intermediate body, for example, an arbitrary part at the outer edge of the intermediate body for magnetic recording medium Compared to a method of measuring the coordinates of three points and calculating and specifying the center of the intermediate, the center of the intermediate can be determined in a short time and the force can be specified reliably and easily. Therefore, the intermediate for the magnetic recording medium can be positioned with respect to the magnetic recording medium manufacturing apparatus (imprint apparatus) in a short time, so that the manufacturing efficiency of the discrete track medium can be further improved.
- the magnetic recording medium manufacturing apparatus imprint apparatus
- the stamper for magnetic recording medium is formed by forming a stamper center specifying mark capable of specifying the center of the stamper.
- the center of the stamper can be identified in a short time and the force can be specified reliably and easily. can do. Therefore, the magnetic recording medium stamper can be positioned with respect to the magnetic recording medium manufacturing apparatus (imprint apparatus) in a short time, so that the manufacturing efficiency of the discrete track medium can be sufficiently improved.
- the magnetic recording medium stamper has a convex portion protruding a part of the center portion or a concave portion protruding a part of the center portion. Since the stamper center specifying mark is formed in the section, the position of the stamper center specifying mark can be surely recognized.
- an intermediate for a magnetic recording medium of the present invention is formed by forming an intermediate center specifying mark capable of specifying the center of the intermediate. Identify the center of the intermediate in a short period of time reliably and easily compared to the method of measuring the coordinates of any three points on the outer edge of the intermediate for recording media and calculating the center of the intermediate can do. Therefore, the intermediate for the magnetic recording medium can be positioned with respect to the magnetic recording medium manufacturing apparatus (imprint apparatus) in a short time, so that the manufacturing efficiency of the discrete track medium can be further improved.
- the convex portion protruding a part of the center portion or the concave portion protruding a part of the center portion in the magnetic recording medium intermediate By configuring the mark for specifying the center of the intermediate in the above, the position of the mark for specifying the center of the intermediate can be surely recognized and recognized.
- a magnetic recording medium manufacturing apparatus 1 for manufacturing a discrete track type magnetic recording medium (hereinafter, also referred to as “discrete track medium”) according to the method of manufacturing a magnetic recording medium according to the present invention will be described with reference to the drawings. This will be described with reference to FIG.
- the magnetic recording medium manufacturing apparatus 1 includes a magnetic recording medium intermediate (hereinafter, also referred to as “intermediate”) M manufactured by the intermediate manufacturing apparatus 2 and a stamper manufacturing apparatus.
- a stamper for magnetic recording media (hereinafter, also referred to as a “stamper”) S manufactured by the method described above, and is capable of manufacturing a discrete track medium D. It comprises 12 and an etching device 13.
- the discrete track medium D is a perpendicular magnetic recording type magnetic recording medium, As shown in FIG.
- the underlayer 52, the soft magnetic layer 53, the orientation layer 54, the recording layer 55 (the magnetic layer in the present invention), and the protective layer 56 are made of a glass base material 51 having a diameter of about 21.6 mm (the support in the present invention).
- a plurality of grooves F, F "having a depth reaching the orientation layer 54 are formed concentrically, whereby a plurality of discrete tracks (hereinafter, referred to as" recording data ") for recording recording data are formed.
- ⁇ ⁇ , ⁇ ⁇ ⁇ ⁇ ⁇ are formed concentrically.
- the intermediate M is composed of a base layer 52, a soft magnetic layer 53, an orientation layer 54, a recording layer 55, and protective layers 56 and 57 laminated on a glass substrate 51 in this order. As shown in FIG. 4, the whole is formed in a disk shape.
- a mark Mm corresponding to the mark for specifying the center of the intermediate in the present invention is formed.
- the mark Mm is composed of a circular recess with a diameter of about 99. and a depth of about 29.9 ⁇ m formed by recessing a part of the center of the preform M. Have been. Further, as shown in FIG.
- the stamper S is formed by laminating a conductive film 63 and a metal film 64, and as shown in FIG. 6, is formed in a disk shape as a whole.
- concentric concave / convex patterns for example, a concave / convex pattern with a formation pitch of about 150 nm
- a mark Sm corresponding to the stamper center specifying mark in the present invention is formed.
- the mark Sm is composed of a circular concave portion having a diameter of about 90 ⁇ and a depth of about 0.2 ⁇ formed by partially recessing the center of the stamper S. ing.
- the coating apparatus 11 forms a resist layer 58a (an example of a resin layer in the present invention: see FIG. 18) by spin coating a resist on the intermediate M.
- the imprint apparatus 12 includes a press base 12a configured similarly to the heating stage of the transfer apparatus (2) proposed by the applicant, and a press mechanism of the transfer apparatus (2). A press head 12b having the same configuration is provided.
- the imprint apparatus 12 transfers the concave / convex pattern of the stamper S to the resist layer 58a by pressing the stamper S against the resist layer 58a formed by the coating apparatus 11, and transfers the mask 58 onto the intermediate M (see FIG. 21). ) Is formed.
- the etching device 13 uses the mask formed by the imprint device 12 A groove F is formed in the preform M by etching the preform M to manufacture a discrete track medium D.
- the etching apparatus 13 is actually an etching apparatus for performing dry etching using plasma using oxygen gas or ozone gas, and a CF gas or other gas.
- An etching device that performs reactive ion etching using CO gas to which gas has been added as a reactive gas and an etching device that performs reactive ion etching using SF gas as a reactive gas
- the intermediate manufacturing apparatus 2 includes an injection molding machine 21, a polishing apparatus 22, and film forming apparatuses 23-25.
- the injection molding machine 21 forms a disk-shaped glass plate 51a (see FIG. 8).
- the polishing device 22 manufactures the glass substrate 51 by polishing both front and back surfaces of the glass plate 51a formed by the injection molding machine 21.
- the film forming apparatus 23 forms the underlayer 52, the soft magnetic layer 53, the orientation layer 54, and the recording layer 55 on the glass substrate 51 in this order by, for example, a sputtering method.
- the film forming apparatus 24 forms the protective layer 56 on the recording layer 55 by, for example, a CVD method.
- the film forming apparatus 25 forms an intermediate M by forming a protective layer 57 on the protective layer 56 by, for example, a sputtering method.
- a disk-shaped glass plate 51a having a thickness of about 0.5 mm is formed by the injection molding machine 21.
- a circular concave portion 51m having a diameter of about 100 ⁇ and a depth of about 150 / im is formed at the center of the glass plate 51a.
- the glass plate 51a formed by the injection molding machine 21 is in a state (slightly roughened state) in which very small irregularities are present on the surface.
- the polishing apparatus 22 grinds the surface of the glass plate 51a by about 0.12 mm to a portion indicated by a broken line in FIG.
- the film forming apparatus 23 forms an underlayer 52, a soft magnetic layer 53, an orientation layer 54, and a recording layer 55 on the surface of the glass substrate 51 (the surface on which the circular recess 51m is formed). Films are formed in this order.
- the film forming apparatus 23 puts Cr (chromium) on the glass base material 51.
- an underlayer 52 having a thickness of about 1 Onm-200 nm is formed by sputtering a Cr alloy.
- the film forming apparatus 23 forms a soft magnetic layer 53 having a thickness of about 50 nm to 300 nm by sputtering Fe (iron) or Co (cobalt) on the underlayer 52. Further, the film forming apparatus 23 forms an orientation layer 54 having a thickness of about 3 nm to 30 nm by sputtering one of Co ⁇ , Mg ⁇ , and Ni ⁇ on the soft magnetic layer 53. Further, the film forming apparatus 23 forms a recording layer 55 having a thickness of about 10 nm to 30 nm by sputtering a Co alloy containing CoCrPt (cobalt-chromium-platinum) or Co on the orientation layer 54. In this case, the material for forming the soft magnetic layer 53, the orientation layer 54, and the recording layer 55 is not limited to the materials exemplified above, and various materials can be appropriately selected.
- the circular concave portion 51m is formed in the center of the glass substrate 51, when each layer is sequentially formed on the glass substrate 51 by the film forming apparatus 23, the thickness of the glass substrate 51 is reduced.
- the part that overlaps the circular recess 51m in the direction is recessed and has a diameter of about 99.
- a circular recess 55m of about 9 / im is formed in the recording layer 55.
- the film forming apparatus 24 has a recording layer 55 on which a diamond-like carbon (having an amorphous structure containing carbon as a main component) having a measured value (hardness) of 200— 8 000 kgf / mm 2 ) to form a protective layer 56 with a thickness of 15 nm.
- a diamond-like carbon having an amorphous structure containing carbon as a main component having a measured value (hardness) of 200— 8 000 kgf / mm 2
- the circular concave portion 55m is formed in the recording layer 55, when the protective layer 56 is formed on the recording layer 55 by the film forming device 24, the circular concave portion is formed in the thickness direction of the glass substrate 51.
- a portion overlapping with 55 m is dented, and a circular concave portion 56 m having a diameter of about 99.8 / im and a depth of about 29.9 / im is formed in the protective layer 56.
- a protective layer 57 having a thickness of 10 to 50 nm is formed by sputtering the TiN (titanium nitride) on the protective layer 56 by the film forming apparatus 25.
- the circular concave portion 56m is formed in the protective layer 56, when the protective layer 57 is formed on the protective layer 56 by the film forming device 25, the circular concave portion 56m is formed in the thickness direction of the glass substrate 51.
- a circular concave portion (mark Mm) having a diameter of about 99. and a depth of about 29.9 zm is formed in the protective layer 57. This completes Intermediate M as shown in the figure.
- the stamper manufacturing device 3 includes a coating device 31, a drawing device 32, a developing device 33, an etching device 34, a film forming device 35, and an electrode device 36.
- the coating device 31 forms a resist layer 62a by applying a resist, for example, by a spin coating method on a glass substrate 61 having a surface subjected to a conductive treatment (see FIG. 12).
- the drawing device 32 forms a latent image 62b by irradiating the resist layer 62a formed by the coating device 31 with an electron beam EB (see FIG. 12).
- the developing device 33 forms the mask 62 on the glass substrate 61 by developing the resist layer 62a on which the formation of the latent image 62b by the drawing device 32 is completed (see FIG. 13).
- the etching device 34 uses the mask 62 formed by the developing device 33 to form the concave portions 61a, 61a 'in the glass substrate 61 (see FIG. 14).
- the film forming apparatus 35 forms the conductive film 63 so as to cover the glass substrate 61 on which the concave portions 61a are formed (see FIG. 15).
- the electrode device 36 forms a metal film 64 on the conductive film 63 by electrolytic plating (see FIG. 16).
- a coating apparatus 31 is spin-coated on a glass substrate 61 by a resist (for example, as shown in FIG.
- a resist layer 62a having a thickness of about 200 nm is formed by applying ZEON Corporation's ZEP520A (positive resist).
- a baking process is performed at 180 ° C. for about 5 minutes to cure the resist layer 62a, and the glass substrate 61 in this state is set in the drawing apparatus 32.
- the pattern writing device 32 irradiates the electron beam EB for patterning to a portion of the concavo-convex pattern of the stamper S where a convex portion is to be formed.
- the developing device 33 develops the resist layer 62a in this state, thereby removing the portion of the latent image 62b and exposing a part of the surface of the glass substrate 61 as shown in FIG. .
- ZED-N50 manufactured by Nippon Zeon Co., Ltd.
- the substrate is immersed in the developer at 26 ° C. for 3 minutes, for example.
- a mask 62 resist pattern
- a cylindrical convex part 62m having a diameter of about 90 xm and a depth of 0.2 ⁇ m is formed of glass. It is formed at the center of the substrate 61.
- the glass substrate 61 in this state is rinsed with, for example, a 23 ° C. (room temperature) rinsing liquid (for example, trade name ZMD—D (Nippon Zeo).
- the mask 62 is dried by spraying with nitrogen gas.
- the glass substrate 61 is etched using an etching device 34 and a mask 62. At this time, a portion of the glass substrate 61 that is not covered by the mask 62 is etched to form a concave portion on the surface of the glass substrate 61, and a concentric concave portion 61a having a depth of about 200 nm and a width of about 100 nm is formed. 61a 'is formed on the glass substrate 61. In the center of the glass substrate 61, a column-shaped projection 61m having a diameter of about 90 xm and a height of about 0.2 xm is formed at a portion covered by the projection 62m of the mask 62. You.
- the glass substrate 61 in this state is immersed in a resist stripper to remove the mask 62 remaining on the glass substrate 61.
- the film forming apparatus 35 vapor-deposits Ni (nickel) on the surface of the glass base material 61 (the surface on which the concave portions 61a, 61a.
- a conductive film 63 having a thickness of about 30 nm is formed.
- the electrode device 36 performs an electrolytic plating process (precipitation process) using the conductive film 63 as an electrode, so that a thickness of about 300 ⁇ m is formed on the conductive film 63.
- a metal film (electrolytic nickel film) 64 is formed. Subsequently, as shown in FIG.
- the laminate of the conductive film 63 and the metal film 64 is separated from the glass base material 61, thereby completing the stamper S as shown in FIG.
- the diameter of the completed stamper S is about 90 / im and the depth is 0.2 ⁇
- a circular concave portion (mark Sm) of a degree is formed.
- the coating apparatus 11 spin-coats, for example, a resist (for example, NEB22A made by Sumitomo Chemical Co., Ltd .: a negative resist) on the intermediate M to obtain a thickness.
- a resist for example, NEB22A made by Sumitomo Chemical Co., Ltd .: a negative resist
- a resist layer 58a of about 100 nm is formed.
- a mark Mm circular concave portion having a diameter of about 99.8 zm and a depth of about 29.9 ⁇ m is formed on the intermediate M (protective layer 57).
- the resist layer 58a is formed on the glass substrate 51, the portion overlapping the mark Mm in the thickness direction of the glass substrate 51 is recessed, and has a diameter of about 99.
- a circular recess 58m of about 29.8 zm is formed in the resist layer 58a.
- 180 ° C Perform a beta process for about 5 minutes to harden the resist layer 58a.
- the intermediate M in which the curing of the resist layer 58a is completed is set on the press base 12a of the imprint apparatus 12.
- the center of the intermediate M is specified by observing the surface of the intermediate M (resist layer 58a) using, for example, a factory microscope.
- the center of the intermediate M since the circular concave portion 58m is formed on the surface of the resist layer 58a, the center of the intermediate M must be specified based on the position of the circular concave 58m (that is, the position of the mark Mm of the intermediate M). Becomes possible.
- the center of the intermediate M is specified in about 1Z5 time. Becomes possible.
- FIG. 19 after finely adjusting the position of the intermediate body M so that the specified center coincides with the reference position P1 of the press base 12a in the thickness direction of the intermediate body M, The body M is fixed to the press base 12a. Thus, the setting of the intermediate M is completed.
- the stamper S is set on the press head 12 b of the imprint apparatus 12 with the surface on which the uneven pattern is formed facing downward.
- the center of the stamper S is specified by observing the surface of the stamper S using, for example, a factory microscope.
- the center of the stamper S can be specified based on the position of the mark Sm. Therefore, the center of the stamper S can be calculated in about 1/5 time compared to the method of calculating the coordinates of any three points for any convex part of the concavo-convex pattern on the stamper S using a factory microscope and calculating the center. The ability to specify S becomes possible.
- stamper S is fixed to the press head 12b. . This completes the setting of Stamper S.
- imprint apparatus 12 heats intermediate M (resist layer 58a) and stamper S.
- the resist layer 58a on the intermediate M is heated by the press base 12a to a temperature equal to or higher than the glass transition point (for example, about 170 ° C.).
- the press head 12b moves the stamper S toward the intermediate M (resist layer 58a) on the press base 12a, and as shown in FIG. Press into layer 58a.
- the imprint apparatus 12 inserts the stamper S into the intermediate body M so that the reference position P2 of the press head 12b coincides with the reference position P1 of the press base 12a in the thickness direction of the intermediate M. Move toward.
- the mark Mm of the intermediate M and the Sm of the stamper S are matched in the thickness direction of the intermediate M.
- the imprint apparatus 12 presses the stamper S with a pressure of 170 kgZ square cm, for example.
- the resist (resist layer 58a) heated to the glass transition point enters the concave portions in the concave / convex pattern of the stamper S.
- the heating of the intermediate M and the stamper S by the press base 12a and the press head 12b is stopped to lower the resist layer 58a and the like to a predetermined temperature (for example, about 50 ° C).
- the head 12b peels off the stamper S from the resist layer 58a.
- the concave / convex pattern of the stamper S is transferred to the resist layer 58a, and the mask 58 is formed on the intermediate M.
- the etching apparatus 13 uniformly dry-etches the entire mask 58 on the preform M by plasma using oxygen gas or ozone gas. At this time, the resist on the bottom surface of the concave portion in the concave / convex pattern of the mask 58 is removed, and the protective layer 57 is exposed from the mask 58. Subsequently, the etching apparatus 13 uses CF gas or SF gas as a reaction gas.
- the protective layer 57 exposed from the mask 58 is etched by reactive ion etching. At this time, as shown in FIG. 22, the protective layer 56 and a part of the recording layer 55 are etched together with the protective layer 57 to form grooves F, F ′′ having a depth reaching the recording layer 55. At this time, most of the mask 58 disappears.Next, the etching apparatus 13 supplies NH gas.
- the protective layer 57 remaining on the protective layer 56 is removed. Thereby, as shown in FIG. 2, the discreet track medium D is completed.
- the center of the stamper S specified based on the mark Sm formed on the stamper S and the center of the The stamper is superposed on the resist layer 58a so that they match in the thickness direction.
- the concave and convex pattern of S for example, the method of measuring the coordinates of three points on an arbitrary convex part in the concave and convex pattern of stamper S and calculating the center of stamper S, and comparing with the method of specifying the stamper S
- the center of S can be determined in a short time, and the force can be specified reliably and easily. Therefore, the stamper S can be positioned with respect to the imprint apparatus 12 in a short time, and as a result, it is possible to sufficiently improve the manufacturing efficiency of the discrete track medium D.
- the method of manufacturing the discrete track medium D by specifying the center of the intermediate body M based on the mark Mm, for example, the coordinates of three arbitrary points on the outer edge of the intermediate body M can be measured.
- the center of the intermediate M can be identified in a short time and the force can be specified reliably and easily. Therefore, the intermediate body M can be positioned with respect to the imprint apparatus 12 in a short time, so that the production efficiency of the discrete track medium D can be further improved.
- the stamper S since the mark Sm is formed by the circular concave portion in which a part of the center portion is concave, the position of the mark Sm can be reliably recognized. That can be S.
- the mark Mm is constituted by the circular concave portion in which a part of the central portion is depressed, so that the position of the mark Mm can be surely recognized.
- the mark Mm of the intermediate body M and the mark Sm of the stamper S have been described as being respectively constituted by circular concave portions, but the present invention is not limited to this.
- an intermediate body Mx shown in FIG. 23 in order to be able to specify the center of the intermediate body Mx at the time of manufacturing the discrete track medium D, a configuration in which a cylindrical (convex) mark Mmx is formed at the center thereof is adopted.
- This mark Mmx has an underlayer on a glass substrate 51x on which a convex part 51mx with a height of about 0 is formed at the center.
- the soft magnetic layer 53, the orientation layer 54, the recording layer 55, and the protective layers 56 and 57 are sequentially formed to project a portion overlapping the convex portion 51mx in the thickness direction of the glass substrate 51x.
- the ability to form S is also, for example, as shown in the stamper Sx shown in FIG.
- a configuration in which a cylindrical (convex) mark Smx is formed at the center thereof can be adopted.
- an intermediate body M having a mark Mm constituted by a circular concave portion and a stamper S having a mark Sm constituted by a circular concave portion have been described by way of example.
- the shapes of the intermediate center identifying mark and the stamper center identifying mark are not limited to the above.
- a part of the center of the intermediate body M (stamper S) may be referred to as a mark Mml or Sml shown in FIG.
- the center position can be specified so that the center position can be specified.
- the mark for specifying the center of the intermediate and the mark for specifying the center of the stamper need not be present at the center point as long as the center of the intermediate M and the center of the stamper S can be specified.
- a configuration is adopted in which the center position is specified by marks Mm2 and Sm2 where there is no intersection (the part indicating the center of the intermediate and the center of the stamper) in the marks Mml and Sml. can do.
- the mark for specifying the center of the intermediate body and the mark for specifying the center of the stamper in the present invention are limited to those formed by projecting a part of the center of the intermediate body M (the stamper S) so that the center is depressed.
- a configuration in which a part of the protective layer 57 is modified so as to be distinguishable (identifiable) from its surroundings to form an intermediate center specifying mark can be employed.
- the diameters and the depths of the marks Mm and the marks Sm described in the embodiment of the present invention are merely examples, and the present invention is not limited thereto.
- an example of manufacturing the discrete track medium D using the intermediate M using the disk-shaped glass substrate 51 as a supporting substrate has been described.
- the present invention is not limited thereto, and the discrete track medium D can be manufactured using the intermediate M using various supporting base materials such as a ceramic base material and a metal base material.
- the manufacturing method of manufacturing the stamper S using the glass base material 61 as the supporting base material has been described as an example, but the manufacturing method of the magnetic recording medium stamper according to the present invention has been described.
- the stamper S can be manufactured using various supporting base materials such as a ceramic base material and a metal base material.
- a support base (a ceramic base or the like) formed of an insulating material is used, and the latent image is formed on the resist layer 62a by irradiating an electron beam EB.
- the manufacturing method of forming 2b it is preferable to conduct a conductive treatment on the surface of the supporting base material in order to avoid charge-up during irradiation with the electron beam EB.
- the film forming apparatus 35 forms the conductive film 63 by depositing Ni (nickel) on the surface of the glass base material 61 when manufacturing the stamper S.
- the method of manufacturing a stamper for a magnetic recording medium according to the present invention is not limited to this, and the conductive film 63 may be formed by electroless plating or sputtering.
- the manufacturing method for specifying the center of the preform M based on the mark Mm has been described.
- the present invention is not limited to this. It can be specified by calculating the center by calculating the coordinates of any three points.
- the center of the stamper specified based on the stamper center specifying mark formed on the stamper for the magnetic recording medium and the magnetic recording medium
- the center of the stamper can be identified in a short time and the force can be specified reliably and easily. S can. Therefore, the magnetic recording medium stamper can be positioned with respect to the magnetic recording medium manufacturing apparatus (imprint apparatus) in a short time. As a result, a method of manufacturing a magnetic recording medium capable of sufficiently improving the manufacturing efficiency of the discrete track medium is realized.
- FIG. 1 is a block diagram showing a configuration of a magnetic recording medium manufacturing apparatus 1 according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing a configuration of a discrete track medium D manufactured by the magnetic recording medium manufacturing apparatus 1.
- FIG. 3 is a cross-sectional view illustrating a configuration of an intermediate M according to an embodiment of the present invention.
- FIG. 4 is an external perspective view of an intermediate M.
- FIG. 5 is a cross-sectional view showing a configuration of a stamper S according to an embodiment of the present invention.
- FIG. 6 is an external perspective view of a stamper S.
- FIG. 7 is a block diagram showing a configuration of an intermediate manufacturing apparatus 2 according to an embodiment of the present invention.
- FIG. 8 is a cross-sectional view of a glass plate 51a formed by the injection molding machine 21.
- FIG. 9 is a cross-sectional view showing a state in which an underlayer 52, a soft magnetic layer 53, an orientation layer 54, and a recording layer 55 are formed on a glass substrate 51 in this order.
- FIG. 10 is a cross-sectional view showing a state where a protective layer 56 is formed on a recording layer 55.
- FIG. 11 is a block diagram showing a configuration of a stamper manufacturing apparatus 3 according to an embodiment of the present invention.
- FIG. 12 is a cross-sectional view showing a state where a resist layer 62a is formed on a glass substrate 61.
- FIG. 13 is a cross-sectional view showing a state where a mask 62 is formed by developing a resist layer 62a.
- FIG. 14 is a cross-sectional view showing a state in which concave portions 61 a and 61 a ′ are formed by etching a glass substrate 61 using a mask 62.
- FIG. 15 is a cross-sectional view showing a state where a conductive film 63 is formed on a glass substrate 61 on which concave portions 61 a and 61 a ′ are formed.
- FIG. 16 is a cross-sectional view showing a state where a metal film 64 is formed on a conductive film 63.
- FIG. 17 is a cross-sectional view showing a state in which a laminate (stamper S) of a conductive film 63 and a metal film 64 has been peeled off from a glass substrate 61.
- FIG. 18 is a cross-sectional view showing a state where a resist is applied on an intermediate M to form a resist layer 58a.
- FIG. 19 The mark Mm of the preform M (the circular recess 58m of the resist layer 58a) is aligned with the reference position P1 of the press base 12a, and the mark Sm of the stamper S and the reference position of the press head 12b. It is sectional drawing of the state which matched P2.
- FIG. 20 is a cross-sectional view of a state in which the convex portion of the concave / convex pattern of the stamper S has been pressed into the resist layer 58a on the intermediate M.
- FIG. 21 is a cross-sectional view showing a state where the stamper S in the state shown in FIG. 20 has been peeled off from the resist layer 58a.
- FIG. 22 is a cross-sectional view of a state where an intermediate M has been etched using a mask 58.
- FIG. 23 is a cross-sectional view of an intermediate Mx according to another embodiment of the present invention.
- FIG. 24 is a sectional view of a stamper Sx according to another embodiment of the present invention.
- FIG. 25 is a plan view of marks Mml and Sml which are another example of the mark for specifying the center of the intermediate body and the mark for specifying the center of the stamper in the present invention.
- FIG. 26 is a plan view of marks Mm2 and Sm2 which are still another example of the mark for specifying the center of the intermediate body and the mark for specifying the center of the stamper in the present invention.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Nanotechnology (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/565,125 US20070115586A1 (en) | 2003-07-22 | 2004-07-20 | Method of manufacturing magnetic recording medium, magnetic recording medium stamper, and magnetic recording medium preform |
Applications Claiming Priority (2)
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JP2003-199730 | 2003-07-22 | ||
JP2003199730A JP2005044390A (ja) | 2003-07-22 | 2003-07-22 | 磁気記録媒体の製造方法、磁気記録媒体用スタンパーおよび磁気記録媒体用中間体 |
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WO2005008636A1 true WO2005008636A1 (ja) | 2005-01-27 |
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ID=34074429
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PCT/JP2004/010299 WO2005008636A1 (ja) | 2003-07-22 | 2004-07-20 | 磁気記録媒体の製造方法、磁気記録媒体用スタンパーおよび磁気記録媒体用中間体 |
Country Status (4)
Country | Link |
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US (1) | US20070115586A1 (ja) |
JP (1) | JP2005044390A (ja) |
CN (1) | CN1826637A (ja) |
WO (1) | WO2005008636A1 (ja) |
Cited By (2)
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EP1688926A1 (en) * | 2005-02-07 | 2006-08-09 | Fujitsu Limited | Method of making magnetic recording medium and die therefor |
CN100446089C (zh) * | 2005-07-27 | 2008-12-24 | 株式会社东芝 | 被构图基底,制造基底的方法,磁记录介质及磁记录装置 |
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JP4600109B2 (ja) * | 2005-03-23 | 2010-12-15 | Tdk株式会社 | スタンパーの製造方法および情報記録媒体の製造方法 |
JP2006331578A (ja) * | 2005-05-27 | 2006-12-07 | Toshiba Corp | 磁気記録媒体、その製造方法および磁気記録装置 |
US20090290255A1 (en) * | 2005-11-11 | 2009-11-26 | Showa Denko K.K. | Method of manufacturing magnetic recording media, magnetic recording media and magnetic read/write device |
JP2008165894A (ja) * | 2006-12-28 | 2008-07-17 | Tdk Corp | 磁気記録媒体、記録再生装置、磁気記録媒体磁化方法および磁気記録媒体磁化装置 |
JP2009043317A (ja) * | 2007-08-07 | 2009-02-26 | Fujifilm Corp | 磁気記録媒体の製造装置及び磁気記録媒体の製造方法 |
WO2009096420A1 (ja) * | 2008-01-31 | 2009-08-06 | Showa Denko K.K. | 凹凸パターン形成方法、およびそれを利用した磁気記録媒体の製造方法 |
JP2010165446A (ja) * | 2008-11-05 | 2010-07-29 | Tdk Corp | 描画方法、スタンパー製造方法、情報記録媒体製造方法および描画装置 |
JP5652075B2 (ja) * | 2010-09-13 | 2015-01-14 | ソニー株式会社 | 記憶素子及びメモリ |
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- 2004-07-20 CN CNA2004800210409A patent/CN1826637A/zh active Pending
- 2004-07-20 US US10/565,125 patent/US20070115586A1/en not_active Abandoned
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CN100446089C (zh) * | 2005-07-27 | 2008-12-24 | 株式会社东芝 | 被构图基底,制造基底的方法,磁记录介质及磁记录装置 |
Also Published As
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JP2005044390A (ja) | 2005-02-17 |
US20070115586A1 (en) | 2007-05-24 |
CN1826637A (zh) | 2006-08-30 |
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