WO2004006240A1 - 光磁気記録媒体 - Google Patents
光磁気記録媒体 Download PDFInfo
- Publication number
- WO2004006240A1 WO2004006240A1 PCT/JP2003/008536 JP0308536W WO2004006240A1 WO 2004006240 A1 WO2004006240 A1 WO 2004006240A1 JP 0308536 W JP0308536 W JP 0308536W WO 2004006240 A1 WO2004006240 A1 WO 2004006240A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- recording
- group
- magneto
- recording medium
- land
- Prior art date
Links
Classifications
-
- 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
-
- 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
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
- G11B11/10578—Servo format, e.g. prepits, guide tracks, pilot signals
-
- 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
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24073—Tracks
- G11B7/24076—Cross sectional shape in the radial direction of a disc, e.g. asymmetrical cross sectional shape
-
- 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
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24073—Tracks
- G11B7/24079—Width or depth
Definitions
- the present invention relates to a magneto-optical recording medium, particularly, for example, a recording medium in which a group for taking out a tracking servo signal is formed.
- the present invention relates to a magneto-optical recording medium using a reproduction method based on a movement detection method, so-called DWDD (Domain Wall Displacement Dection).
- DWDD Domain Wall Displacement Dection
- the magneto-optical recording media based on the DWDD method are particularly important optical recording media because high-density recording is possible.
- the reproduction by the DWDD method is based on a method in which the domain wall of the recording mark is displaced by the temperature distribution caused by the irradiation of the reproducing laser beam to the magneto-optical recording medium, the recording mark is enlarged, and the enlarged recording mark is read. In this way, the recording mark is miniaturized below the limit determined by the spot diameter of the reproduction light to achieve a high recording density.
- the purpose of the present invention is to apply the DWDD method and In a magneto-optical recording medium, recording is performed sufficiently to ensure smooth domain wall motion, reduce jitter and bit error rate, and at the same time perform proper high-density recording.
- An object of the present invention is to provide a magneto-optical recording medium capable of increasing a power margin.
- the present invention is a magneto-optical recording medium in which group recording is performed and the reproduction method is the DWDD method, and the shape of the bent portion of each side edge of the group and the land dividing the group is as follows. It has been found that the characteristics of the medium, particularly the above-mentioned domain wall movement and the recording power margin are affected, and the above-mentioned object is achieved by specifying these shapes.
- the curvature of the side edge of the land that is, the radius of curvature R 1 in a cross section orthogonal to the recording track of the shoulder adjacent to the group of the land is set to 30 nm or less, and the radius of curvature of the group to be recorded is set to 30 nm or less.
- the radius of curvature R 2 of the side edge, that is, the inner edge adjacent to the land, in a cross section orthogonal to the recording track is 2 O nm or more.
- the lower limit of R 1 and the upper limit of R 2 are, in practice, both a concave-convex shape enough to obtain a required tracking signal and a lower limit and an upper limit at which a step is obtained.
- the group recording specifically, the laser beam is performed by making the shoulder of the land that separates the group steeper than the ordinary DWDD. Transfer of heat to the land during thermal recording due to irradiation, and also to other groups adjacent to the land, can be reduced, improving crosstalk during recording.
- the overwrite is improved and the recording power margin is expanded, and at the same time, the domain walls move during playback by smoothing the bottom edges of the group compared to normal DWDD. Can be smooth, And the bit error rate can be reduced.
- FIG. 1 is a schematic sectional view of an example of a magneto-optical recording medium according to the present invention.
- FIG. 2 is a configuration diagram of an example of a film layer including an information recording layer of the magneto-optical recording medium according to the present invention.
- FIG. 3 is a schematic cross-sectional view of a main part showing a configuration for explaining a substrate shape of a magneto-optical recording medium according to the present invention.
- FIGS. 4A and 4B show AFM (Type-A and Type-B).
- FIGS. 5A and 5B are schematic enlarged perspective views of the lands and grooves drawn based on the photograph.
- FIGS. 5A and 5B show the margin of the magneto-optical recording medium by the substrate shown in FIGS. 4A and 4B.
- FIGS. 6A to 6E are views showing measured results
- FIGS. 6A to 6E are partial process diagrams of an example of a method for manufacturing a magneto-optical recording medium according to the present invention
- FIGS. 7A and 7B are shown in FIGS.
- FIGS. 8A and 8B are enlarged cross-sectional views of main parts of FIGS. 6C and 6D. It is. BEST MODE FOR CARRYING OUT THE INVENTION
- a tracking medium signal is obtained on at least one principal surface of a recording medium substrate 1, for example, a disk substrate.
- a recording medium substrate for example, a disk substrate.
- a helical or concentric group 2 and an uneven surface 4 formed with a land 3 for dividing the group 2 are formed, and the uneven surface 4 is formed of at least a magnetic layer.
- a laminated film 5 having a recording layer and a reproducing layer is formed.
- a non-magnetic dielectric layer 6 As shown in the cross-sectional view of FIG. On top are, for example, a non-magnetic dielectric layer 6, a moving layer 7 having a small domain wall coercivity due to the magnetic layer, a cutting layer 8 having a low Curie point T c, and a large domain wall coercivity, respectively. It is formed by laminating recording layers 9 having characteristics.
- a protective layer 11 is formed on the laminated film 5 so as to fill the uneven surface.
- the recording layer 9 and the moving layer 7 are magnetically exchange-coupled via the cutting layer 8, and the recording marks recorded on the recording layer 9 are transferred to the moving layer 7. Have been.
- a laser beam L is irradiated from the back side of the magneto-optical recording medium substrate 1, for example, to perform reproduction by DWDD, that is, a cutting layer 8 of a recording mark forming portion to be reproduced by irradiation with reproduction laser light.
- DWDD that is, a cutting layer 8 of a recording mark forming portion to be reproduced by irradiation with reproduction laser light.
- the exchange coupling between the moving layer 7 and the recording layer 9 is released, and the domain wall of the recording mark in the moving layer 7 is exposed to the temperature distribution in the laser light spot.
- the recording mark By moving the recording mark along the extension direction of the group 2, the recording mark can be enlarged and a necessary and sufficient reproduction output can be obtained.
- the recording mark since the recording mark is enlarged, the recording mark itself can be miniaturized, and therefore, high-density recording is performed.
- FIG. 3 a sectional view of the group 2 and the land 3 adjacent thereto, as shown in FIG.
- the radius of curvature R 1, R in the direction perpendicular to each recording track of the inner edge portion, that is, in the direction perpendicular to the extension direction of the group, that is, the portion 3 S and the bent portion adjacent to the land 3 of group 2 2 is specified.
- the radius of curvature R 1 is set to 30 nm or less, and the radius of curvature R 2 Is set to 20 nm or more.
- the lower limit of R 1 and the upper limit of R 2 are actually the shape enough to obtain the required tracking servo signal, and the lower and upper limits at which the step is obtained. Become.
- Type A the radius of curvature R 2 of both side edges 2 C of Group 2 was set to 20 nm, and the radius of curvature R 1 of shoulder 3 S of Land 3 was set to 69 nm.
- Type_B is a case where the radius of curvature R1 of the shoulder 3S of the land 3 is 3 Onm, and the radius of curvature R2 of both side edges 2C of the group 2 is 7 nm.
- FIG. 4 A and B are schematic diagrams based on AFM (Atomic Force Microscope) photographs of the land and group of the recording medium substrate 1 according to the type A and type B.
- FIG. 4 A and B are schematic diagrams based on AFM (Atomic Force Microscope) photographs of the land and group of the recording medium substrate 1 according to the type A and type B.
- FIG. 4 A and B are schematic diagrams based on AFM (Atomic Force Microscope) photographs of the land and group of the recording medium substrate 1 according to the type A and type B.
- FIG. 4 A and B are schematic diagrams based on AFM (Atomic Force Microscope) photographs of the land and group of the recording medium substrate 1 according to the type A and type B.
- FIG. 4 A and B are schematic diagrams based on AFM (Atomic Force Microscope) photographs of the land and group of the recording medium substrate 1 according to the type A and type B.
- FIG. 4 A and B are schematic diagrams based on AFM (Atomic Force Microscope) photographs
- type-1A and type-1B magneto-optical recording media consist of a 0.6 mm thick polycarbonate substrate 1 on a 4 O nm thick SiON dielectric film, 4 0 11 111 0 (moving layer by 1-6 Co film, control layer by 3 nm thick TbFeCo film, cutting by 1 Onm thick TbFeCoAl film Layer, recording layer of 5 O nm thick TbFeCo film, recording aid layer of 10 nm thick GdFeCo film, dielectric of 3 Onm thick SiN film A reflective film or a temperature control film of a body layer and an Al alloy film having a thickness of 300 nm was formed.
- control layer is a layer that functions to control noise to reduce domain wall motion during reproduction
- recording auxiliary layer is a layer that improves magnetic field sensitivity during recording.
- the track pitch was 0.44 ⁇ m
- the pit length was 0.09 IX m.
- the duty ratio of the recording pulse was 33%.
- curves 51A and 51B respectively represent data recorded in the main group and the adjacent groups adjacent to the main group, and the data written in the main group. This is a curve that plots the measurement results of the jitter of the playback signal of the main group when another data record is newly overwritten (OW) on the record.
- the curves 52A and 52B were recorded in the main group first, followed by data recording in both adjacent groups, and then returned to the main group to measure the jitter. This is a plotted curve. In other words, in this case, it measures the effect of the adjacent group's record, that is, the cross light (C.W.).
- the jitter can be 15% or less
- the range where both the jitter is 15% or less in both curves 51A and 52A is 6.
- the curves 51B and 52B are 7.6 mW ⁇ 26%, and the recording power margin is expanded.
- the radius of curvature of the shoulder 3S of the land 3 becomes the type B. It is desirable to make it smaller than 30 nm. That is, even if the inner angle of the shoulder 3S is less than 90 °, it is acceptable.
- type 1A is lower than type 1B. This is because the radius of curvature R 2 of both side edges 2 C of Group 2 is 7 nm, whereas in Type 1 B, R 2 has a gentle curvature of 2 O nm. It is considered that the movement of the domain wall of the recording mark is likely to occur. Therefore, it is preferable that the radius of curvature of both side edges 2C of group 2 in reducing the jitter bottom be at least 2 Onm or more.
- the radius of curvature R 1 of the shoulder 3 S of the land 3 is selected to be 30 nm or less, and both side edges of the group 2 are selected.
- the radius of curvature R 2 of 2 C should be at least 2 O nm or more.
- a concave / convex surface 4 having a group 2 for obtaining a tracking service signal at the time of recording and reproduction and a land 3 for separating these are formed on the recording medium substrate 1.
- a stamper for inverting the uneven surface 4 is arranged in the mold cavity. To form simultaneously with the molding of the substrate 1.
- a so-called 2 P is formed by applying an ultraviolet-curing resin onto the substrate 1 and pressing the stamper for transferring and forming the uneven surface 4 onto the coating layer of the resin and pressing the stamper.
- the uneven surface 4 is formed by the 1 ymerization) method.
- a manufacturing process of a master for manufacturing the stamper is employed. A method of manufacturing this stamper will be described with reference to the process charts of FIGS. 6 and 7.
- a substrate 21 having a smooth surface for producing a master for example, a glass substrate is prepared, and a lower layer resist such as a Si-based photoresist is provided on the smooth surface.
- the lower resist layer and the upper resist layers 31 and 32 are subjected to pattern exposure by electron beam drawing or optical exposure, and then to development processing.
- An opening 33 W is formed in the group forming portion of the above-mentioned uneven surface 4, and RIE (Reactive Ion Etching) is performed from above the laminated resist layer 33.
- RIE Reactive Ion Etching
- oxygen plasma treatment is performed.
- the portion surrounded by the circle a in FIG. 6C is left with a resist layer 31 having a small etching tint, and the opening 33
- the oxygen plasma treatment is performed in a state in which the concave portion is formed, so that the shoulder portion of the convex portion 21 3 becomes steep, and the gentle curved side edge of the concave portion 2 12 is formed. It is formed.
- the resist layer 33 is dissolved and removed.
- a recess 2 12 having a shape and a depth corresponding to the aforementioned group 2 is formed, and a land 2 13 for separating the recess 2 12 corresponding to the land 3 is formed.
- a master 35 for tamper making is formed.
- a nickel plating layer 36 is formed on the master 35 by, for example, an electroless plating and an electrolytic plating.
- the plating layer 36 is peeled off from the master 35 as shown in FIG. 7A to obtain a stamper 36 on which an uneven surface having an inverted master pattern is formed.
- a stamper 36 is formed by repeating the same plating.
- the irregular surface 4 on which the target group 2 and the land 3 are formed is formed by the 2P method or as a stamper in the injection molding, as shown in FIG. 7B.
- the formed magneto-optical recording medium substrate 1 is obtained.
- the land 3 having the shoulder 3 S having the required small radius of curvature R 1 described above and the group 2 having the side edge 2 C having the large radius of curvature R 2 are formed.
- a substrate 1 having a surface 4 is formed.
- the curvature radii R 1 and R 2 are set to R l ⁇ 30 nm and R 2 ⁇ 20 nm according to the conditions of the RIE and the oxygen plasma processing described above, for example, selection of each processing time. can do.
- a magneto-optical recording medium is obtained by forming a film formation layer 5 having the film configuration described in FIG. 2, for example, on the substrate 1.
- the magneto-optical recording medium using the DWDD according to the present invention can perform recording by specifying the radius of curvature R 1 of the shoulder 3 S of the land 3 and the radius of curvature R 2 of both side edges 2 C of the group 2.
- the power margin is large, the bottom jitter is low, and the error rate is improved.
- the RI is formed by the laminated resist layer 33 in which the resist layer 31 having a small etching rate is formed as a lower layer.
- the lower and upper photo resist layers are formed by laminating two layers.
- the depth of the group is a shallow group of about 35 nm. For this reason, it is possible to perform RIE using a single-layer resist layer to leave the single-layer resist layer at a required thickness, and then perform an oxygen plasma treatment.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03741199A EP1521254B1 (en) | 2002-07-04 | 2003-07-04 | Magneto-optical recording medium |
AT03741199T ATE441186T1 (de) | 2002-07-04 | 2003-07-04 | Magneto-optisches aufzeichnungsmedium |
DE60328988T DE60328988D1 (de) | 2002-07-04 | 2003-07-04 | Magneto-optisches aufzeichnungsmedium |
US10/488,386 US7257076B2 (en) | 2002-07-04 | 2003-07-04 | Magneto-optical recording medium |
JP2004519271A JPWO2004006240A1 (ja) | 2002-07-04 | 2003-07-04 | 光磁気記録媒体 |
US11/890,617 US7586833B2 (en) | 2002-07-04 | 2007-08-07 | Magneto-optical recording medium |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002195729 | 2002-07-04 | ||
JP2002-195729 | 2002-07-04 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10488386 A-371-Of-International | 2003-07-04 | ||
US11/890,617 Continuation US7586833B2 (en) | 2002-07-04 | 2007-08-07 | Magneto-optical recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004006240A1 true WO2004006240A1 (ja) | 2004-01-15 |
Family
ID=30112348
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/008536 WO2004006240A1 (ja) | 2002-07-04 | 2003-07-04 | 光磁気記録媒体 |
Country Status (8)
Country | Link |
---|---|
US (2) | US7257076B2 (ja) |
EP (1) | EP1521254B1 (ja) |
JP (1) | JPWO2004006240A1 (ja) |
KR (1) | KR20050025117A (ja) |
AT (1) | ATE441186T1 (ja) |
DE (1) | DE60328988D1 (ja) |
TW (1) | TWI227480B (ja) |
WO (1) | WO2004006240A1 (ja) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06302028A (ja) * | 1993-04-16 | 1994-10-28 | Tdk Corp | 光磁気ディスク |
JPH0917031A (ja) * | 1995-06-29 | 1997-01-17 | Sony Corp | 光ディスク |
JPH11120636A (ja) * | 1997-10-16 | 1999-04-30 | Canon Inc | 光磁気記録媒体 |
JPH11213470A (ja) | 1998-01-22 | 1999-08-06 | Sony Corp | 光磁気ディスク及びその製造方法 |
JP2001110101A (ja) | 1999-07-30 | 2001-04-20 | Fujitsu Ltd | 記録媒体とその製造方法 |
JP2001195785A (ja) * | 1999-11-01 | 2001-07-19 | Mitsubishi Chemicals Corp | 光記録媒体及びその記録再生方法 |
JP2002367249A (ja) * | 2001-06-06 | 2002-12-20 | Canon Inc | 記録媒体およびその製造方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3376697B2 (ja) | 1994-06-17 | 2003-02-10 | 三菱化学株式会社 | 光磁気記録媒体及びその再生方法 |
WO1997038421A1 (en) * | 1996-04-10 | 1997-10-16 | Hitachi Maxell, Ltd. | Optical recording medium |
WO2000072319A1 (fr) | 1999-05-19 | 2000-11-30 | Fujitsu Limited | Support d'enregistrement de donnees et procede de fabrication dudit support |
JP2002216403A (ja) * | 2001-01-16 | 2002-08-02 | Canon Inc | 光磁気ディスクのアニール方法、及び光磁気ディスク |
JPWO2002086882A1 (ja) | 2001-04-19 | 2004-08-12 | キヤノン株式会社 | 光磁気記録媒体 |
JP2004030817A (ja) | 2002-06-27 | 2004-01-29 | Canon Inc | 光磁気ディスク |
-
2003
- 2003-07-04 TW TW092118350A patent/TWI227480B/zh not_active IP Right Cessation
- 2003-07-04 EP EP03741199A patent/EP1521254B1/en not_active Expired - Fee Related
- 2003-07-04 AT AT03741199T patent/ATE441186T1/de not_active IP Right Cessation
- 2003-07-04 DE DE60328988T patent/DE60328988D1/de not_active Expired - Fee Related
- 2003-07-04 WO PCT/JP2003/008536 patent/WO2004006240A1/ja active Application Filing
- 2003-07-04 US US10/488,386 patent/US7257076B2/en not_active Expired - Fee Related
- 2003-07-04 KR KR1020047003167A patent/KR20050025117A/ko not_active Application Discontinuation
- 2003-07-04 JP JP2004519271A patent/JPWO2004006240A1/ja active Pending
-
2007
- 2007-08-07 US US11/890,617 patent/US7586833B2/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06302028A (ja) * | 1993-04-16 | 1994-10-28 | Tdk Corp | 光磁気ディスク |
JPH0917031A (ja) * | 1995-06-29 | 1997-01-17 | Sony Corp | 光ディスク |
JPH11120636A (ja) * | 1997-10-16 | 1999-04-30 | Canon Inc | 光磁気記録媒体 |
JPH11213470A (ja) | 1998-01-22 | 1999-08-06 | Sony Corp | 光磁気ディスク及びその製造方法 |
JP2001110101A (ja) | 1999-07-30 | 2001-04-20 | Fujitsu Ltd | 記録媒体とその製造方法 |
JP2001195785A (ja) * | 1999-11-01 | 2001-07-19 | Mitsubishi Chemicals Corp | 光記録媒体及びその記録再生方法 |
JP2002367249A (ja) * | 2001-06-06 | 2002-12-20 | Canon Inc | 記録媒体およびその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1521254A1 (en) | 2005-04-06 |
US20080002530A1 (en) | 2008-01-03 |
DE60328988D1 (de) | 2009-10-08 |
US7257076B2 (en) | 2007-08-14 |
US7586833B2 (en) | 2009-09-08 |
EP1521254B1 (en) | 2009-08-26 |
TW200414171A (en) | 2004-08-01 |
JPWO2004006240A1 (ja) | 2005-11-04 |
ATE441186T1 (de) | 2009-09-15 |
TWI227480B (en) | 2005-02-01 |
EP1521254A4 (en) | 2008-05-28 |
US20050030837A1 (en) | 2005-02-10 |
KR20050025117A (ko) | 2005-03-11 |
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