WO2003102943A1 - Support d'enregistrement optique, et dispositif de stockage optique - Google Patents
Support d'enregistrement optique, et dispositif de stockage optique Download PDFInfo
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- WO2003102943A1 WO2003102943A1 PCT/JP2002/005382 JP0205382W WO03102943A1 WO 2003102943 A1 WO2003102943 A1 WO 2003102943A1 JP 0205382 W JP0205382 W JP 0205382W WO 03102943 A1 WO03102943 A1 WO 03102943A1
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- optical recording
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- 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
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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
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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
- G11B11/1055—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
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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
- 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
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- 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
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00718—Groove and land recording, i.e. user data recorded both in the grooves and on the lands
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- 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
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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
- G11B11/10532—Heads
- G11B11/10541—Heads for reproducing
- G11B11/10543—Heads for reproducing using optical beam of radiation
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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
- G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
Definitions
- the present invention generally relates to an optical recording medium, and more particularly, to a land-group recording type magneto-optical recording medium. Background technology
- the laser wavelength currently used in a 3.5-inch magneto-optical disk drive is 650 nm, but this is changed to a blue-violet laser with a wavelength of 405 nm.
- the diameter of the magnetic spot is reduced to 0.65 from the conventional value of about 1.0 ⁇ m, enabling high-density recording.
- Magneto-optical disks are known as high-density recording media, but as the amount of information increases, higher densities are required.
- the output does not change even if the beam spot on the medium moves, so the output waveform becomes a straight line and the The presence or absence cannot be identified.
- the beam spot may be narrowed down.
- the size of the beam spot depends on the wavelength ⁇ of the light source and the numerical aperture of the objective lens. Due to the restriction of ⁇ , it is not possible to squeeze sufficiently small.
- MSR Magnetically induced super-resolution
- a non-magnetic layer is inserted between the reproducing layer and the recording layer, and the recording marks on the recording layer are transferred to the reproducing layer by magnetostatic coupling to reproduce information.
- a type of MSR media has been proposed. Using an in-plane film that has easy magnetization in the in-plane direction at room temperature as the reproducing layer, so that the recording marks of the recording layer are transferred to the reproducing layer only in the portions that have become hot due to laser beam irradiation. As a result, portions other than the reproduction portion are masked by the reproduction layer, and super-resolution reproduction becomes possible.
- the magnetization of the reproducing layer other than the aperture portion is in-plane, so that it is not detected, and it is strong against crosstalk from an adjacent track, and the track pitch can be narrowed. ⁇ ⁇ .
- the beam spot diameter is approximately 1.0 ⁇ m (1 / e). 2
- a beam spot diameter of about 0.65 m can be obtained by setting the laser beam wavelength to 405 nm. Since the resolution is improved by reducing the beam spot diameter, it is possible to record a small mark and the recording density is improved.
- CAD media using a laser beam with a wavelength of 65 nm is currently in practical use, and a CN ratio of about 45 dB has been obtained at the shortest mark length of 0.40 m. Converted by beam diameter Then, if a laser beam of 405 nm is used, a CN ratio of about 45 dB should be obtained with a mark of 0.25 ⁇ m, but a mark length of 0.25111 is actually obtained.
- an object of the present invention is to provide an optical recording medium that can achieve good recording and reproducing characteristics for both a land and a group with a small beam diameter using a short wavelength laser.
- an optical recording medium having a recording track composed of a land and a group, wherein a laser beam used for recording and reproduction has a beam diameter of 0.7 Adm or less on a recording medium surface.
- a transparent substrate having a plurality of land and a plurality of groups formed alternately; and an optically recordable recording layer provided on the transparent substrate, wherein each of the land and each group is provided.
- w1 is the width of the land at the center height of the boundary
- w2 is the width of the flat top of the land
- d is the depth of each group.
- each group has a curved edge portion
- the recording layer is composed of a magneto-optical recording layer made of a rare earth transition metal material.
- a recording track comprising a land and a group.
- the diameter of a laser beam used for recording / reproducing on a recording medium surface is 0.7 Adm or less.
- a lower magneto-optical recording medium comprising: a transparent substrate having a plurality of alternately formed land and a plurality of groups; and a relatively large force-rotation angle provided on the transparent substrate.
- each of the lands has a curved edge portion. Is provided.
- a magneto-optical device having a recording track composed of a land and a group, wherein a laser beam used for recording and reproducing has a beam diameter of 0.7 Aim or less on a recording medium surface.
- a recording medium comprising: a transparent substrate having a plurality of alternately formed lands and a plurality of groups; and a second substrate provided on the transparent substrate and having easy in-plane magnetization at room temperature.
- a single-layer recording layer provided on the non-magnetic blocking layer and having a perpendicular magnetization easiness at room temperature; a non-magnetic overcoat layer provided on the recording layer; A metal layer provided on a single layer, wherein each land and each groove When the width of the land at the center height of the boundary is w1, the width of the flat top of the land is w2, and the depth of each group is d,
- each of the above-mentioned lands has a curved edge portion. Is provided.
- the Curie temperatures of the first and second regeneration layers are Tc1 and Tc2, respectively.
- the first reproducing layer is 25 ⁇ ! It has a thickness trl of ⁇ 35 nm. (2) When the thickness of the reproducing layer is 7 r 2,
- the non-magnetic overcoat layer has a thickness of 5 nm to 15 nm, and the metal layer has a thickness of 50 ⁇ !
- the nonmagnetic blocking layer has a thickness of 0.5 nm to 2 nm.
- an optical storage device capable of at least reading out information recorded on an optical recording medium having a recording track composed of a land and a groove.
- An optical head that irradiates the optical recording medium with a laser beam having a beam diameter of 0.7 ⁇ m or less, and a photodetector that generates a reproduction signal from the light reflected by the optical recording medium.
- the optical recording medium comprises: a transparent substrate having a plurality of alternately formed lands and a plurality of groups; and an optically recordable recording layer provided on the transparent substrate.
- Figure 1 is a partially cutaway sectional view of an optical recording medium for land group recording
- FIG. 2 is a configuration diagram of a magneto-optical recording medium according to the first embodiment of the present invention
- FIG. 3 is a configuration diagram of a magneto-optical recording medium according to a second embodiment of the present invention.
- FIG. 4 is a configuration diagram of a magneto-optical recording medium according to a third embodiment of the present invention.
- FIG. 5 is a configuration diagram of a magneto-optical recording medium according to a fourth embodiment of the present invention.
- FIG. 6 is a configuration diagram of a magneto-optical recording medium according to a fifth embodiment of the present invention.
- FIG. 7 is a photograph of a substrate having a square group (square land) used in the experiment of the present invention.
- Figure 8 shows a photo of a substrate with a round group (round land) used in the experiment of the present invention. True;
- FIG. 9 is a diagram showing w 2 / w 1 dependence of the CN ratio of the magneto-optical recording medium (CAD medium) of the third embodiment shown in FIG. 4;
- Fig. 10 is a diagram showing the groove depth dependence of the CN ratio of the magneto-optical recording medium (CAD medium) shown in Fig. 4;
- FIG. 11 is a diagram showing the w 2 / w l dependency of the CN ratio of the magneto-optical recording medium (normally MO medium) of the fourth embodiment shown in FIG. 5;
- Fig. 12 and Fig. 5 show the dependence of the groove depth on the magneto-optical recording medium (ordinary MO medium) of the fourth embodiment
- FIGS. 13 and 13 show the w 2 / w 1 dependence of the CN ratio of the magneto-optical recording medium (double-layered medium) of the fifth embodiment shown in FIG. 6;
- FIG. 14 is a diagram showing the groove depth dependency of the CN ratio of the magneto-optical recording medium (double-layered medium) of the fifth embodiment shown in FIG. 6;
- FIG. 15 is a diagram showing the Curie temperature Tc dependence of the CN ratio of the second reproducing layer of the magneto-optical recording medium of the third embodiment shown in FIG. 4; A diagram showing the dependency of the CN ratio of the magneto-optical recording medium of the third embodiment on the thickness of the first reproducing layer;
- FIG. 17 is a diagram showing the dependency of the CN ratio of the magneto-optical recording medium of the third embodiment on the thickness of the second reproducing layer;
- FIG. 18 shows the dependency of the CN ratio of the magneto-optical recording medium of the third embodiment on the thickness of the nonmagnetic blocking layer
- FIG. 19 is a diagram showing the dependency of the CN ratio of the magneto-optical recording medium of the third embodiment on the thickness of the overcoat layer;
- FIG. 20 is a diagram showing the dependency of the recording sensitivity of the magneto-optical recording medium of the third embodiment on the thickness of the overcoat layer;
- FIG. 21 shows the A 1 layer thickness dependence of the CN ratio of the magneto-optical recording medium of the third embodiment
- FIG. 22 shows the dependency of the recording sensitivity of the magneto-optical recording medium of the third embodiment on the thickness of the A 1 layer;
- FIG. 23 is a block diagram of the optical disk device according to the present invention.
- FIG. 24 is an explanatory view of the internal structure of the device in which the M-cartage is opened.
- the optical recording medium 2 usually has a disk shape.
- the transparent substrate 4 made of glass or polycarbonate has a land 8 and a group 10 formed alternately.
- the center distance (track pitch) between the land 8 adjacent to the substrate 4 and the group 1.0 is, for example, 0.40 zm, and the recording layer 6 is laminated on the substrate 4.
- the step between the land 8 of the substrate 4 and the group 10 is, for example, 35 nm.
- the optical recording medium 2 applicable to the present invention may be any optical recording medium having at least a land and a groove as a recording track.
- the recording layer 6, for example, a magneto-optical recording layer, a phase-change recording layer, or the like can be used. .
- Both the edge portion 8a of the land 8 formed on the substrate 4 and the edge portion 10a of the groove 10 have a curved surface shape having a predetermined radius of curvature. Further, as will be described in detail later, the width of the land 8 at the center height of the boundary between each land 8 and each group 10 is w1, and the width of the flat top of the land 8 is w1. 2. If the depth of each group 10 is d,
- a groove and a pit are prepared on a transparent substrate in advance. Specifically, using a stamper having a positive type resist film, a portion excluding a portion corresponding to a group and a peak is exposed to a laser beam. Next, development and etching are performed to form convex portions corresponding to the grooves and pits. Here, etching is performed by ion milling, sputtering, or the like in order to give a predetermined curvature to the edge portion of the land or the edge portion of the group.
- the stamper thus produced is mounted on a mold of an injection molding machine, and a resin such as polycarbonate is supplied to the injection molding machine to form a land 8 and a transparent substrate 4 having groups 10 alternately formed. create. Thereafter, a recording layer, a protective layer, and a reflective layer are formed on the transfer surface (the surface on which the groups and pits are formed) of the transparent substrate 4 to complete the optical recording medium.
- a resin such as polycarbonate
- FIG. 2 shows a configuration diagram of the magneto-optical recording medium 12A according to the first embodiment of the present invention.
- an underlying dielectric layer 14 of SiN On the transparent substrate 4 shown in FIG. 1, an underlying dielectric layer 14 of SiN, a reproducing layer 16 of GdFeCo, a nonmagnetic layer 18 of SiN 18, TbFe
- the recording layers 20 made of Co are stacked in this order.
- a metal layer 24 including the SiN overcoat layer 22 and A1 is formed in a single layer.
- the magneto-optical recording medium 12 A of the present embodiment has a magnetic induction super-resolution of a CAD (center 'aperture.' Detection) type in which the recording marks of the recording layer 20 are transferred to the reproducing layer 16 by magnetostatic coupling. ⁇ (MSR) media.
- the reproducing layer 16 has a relatively large Kerr rotation angle and a small coercive force at room temperature as compared with the recording layer 20.
- the recording layer 20 has a relatively small force per rotation angle and a large coercive force at room temperature as compared with the reproducing layer 16.
- FIG. 3 shows a configuration diagram of a magneto-optical recording medium 12 B according to the second embodiment of the present invention.
- an underlying dielectric layer 14 made of SiN On the transparent substrate 4 shown in FIG. 1, an underlying dielectric layer 14 made of SiN, a first reproducing layer 26 made of GdFeCo, and a second reproducing layer made of GdFeCo. A nonmagnetic layer 30... And a recording layer 32 of TbFeCo are laminated in this order.
- a mail layer 24 including the SiN overcoat layer 22 and A1 is laminated.
- the metal layer 24 may be formed from a material containing Au, Cu, and Ag as main components.
- the magneto-optical recording medium 12 B of the present embodiment also has a CAD type MSR in which the recording marks of the recording layer 32 are transferred to the second reproducing layer 28 and the first reproducing layer 26 by magnetostatic coupling. It is a medium.
- the first reproducing layer 26 and the second reproducing layer 28 have in-plane magnetization easiness at room temperature.
- the recording layer 32 is a single layer and has easy magnetization in the perpendicular direction at room temperature.
- FIG. 4 is a configuration diagram of a magneto-optical recording medium 12C according to the third embodiment of the present invention.
- an underlying dielectric layer 14 of SiN On the transparent substrate 4 shown in FIG. 1, an underlying dielectric layer 14 of SiN, a first reproducing layer 26 of GdFeCo, a second reproducing layer 28 of GdGe, A nonmagnetic layer 30 made of SiN and a recording layer 32 made of TbFeCo are stacked in this order.
- a recording auxiliary layer 34 made of GdFeCo and a metal layer 24 including a SIN overcoat layer 22A1 are laminated.
- the recording marks of the recording layer 32 are formed by the magnetostatic coupling of the second reproducing layer 28 and the first reproducing layer 2.
- This is a CAD type MSR media that is transferred to 6.
- the first reproducing layer 26 and the second reproducing layer 28 have easy magnetization in the in-plane direction at room temperature.
- the recording layer 32 is a single layer and has perpendicular magnetization at room temperature.
- FIG. 5 shows a configuration diagram of a magneto-optical recording medium 12D according to a fourth embodiment of the present invention.
- a base dielectric layer 14 made of SiN On the transparent substrate 4 shown in FIG. 1, a base dielectric layer 14 made of SiN, a recording layer 36 made of TbFeCo, a recording auxiliary layer 38 made of GdFeCo, S The metal layer 24 including the iN overcoat layer 22 and A1 ⁇ is stacked in this order.
- the magneto-optical recording medium 12D of the present embodiment is a normal type magneto-optical recording medium. . ⁇
- FIG. 6 shows a configuration diagram of the magneto-optical recording medium 12E of the fifth embodiment of the present invention.
- an underlying dielectric layer 14 of SiN On the transparent substrate 4 shown in FIG. 1, an underlying dielectric layer 14 of SiN, a reproducing layer 39 of GdFeCo, a recording layer 36 of TbFeCo, and Gd
- the recording auxiliary layer 38 made of FeCo is laminated in this order.
- a metal layer 24 including a Si overcoat layer 22 and A1 is laminated.
- the magneto-optical recording medium 12 E of this embodiment has a reproducing layer 3.9.
- a recording layer 36 a two-layer film medium. .
- a method of manufacturing the magneto-optical recording medium 12C of the third embodiment shown in FIG. 4 will be described in detail.
- a plurality of substrates 4 were prepared in which the distance (track pitch) between adjacent lands 8 and group 10 was 0.40 ⁇ m and the value of w 2 / wl in Fig. 1 and the depth d of group 10 were changed.
- the above substrate is transferred to the first chamber equipped with a Si target, Ar gas and N 2 gas are introduced, and a 40 nm SiN layer is formed by reactive sputtering. A film was formed.
- the second reproducing layer 28 made of Fe was formed into a film.
- the film thickness of the first reproducing layer 26 was adjusted by adjusting the sputtering time. Input power and deposition time for target and Fe By changing the composition, the composition and the film thickness were adjusted.
- the Curie temperature of the second reproducing layer 28 was changed by adjusting the composition of Gd and Fe. That is, the Gd composition of the second reproducing layer 28 was changed in the range of 13 at% to 21 at%.
- the Curie temperature at Gd 13% is 150 ° C and the curry temperature at Gd 21% is 200 ° C.
- the substrate was returned to the first chamber, and a SIN non-magnetic blocking layer 30 was formed.
- the film thickness of the SIN non-magnetic blocking layer 30 was adjusted by changing the film formation time.
- the substrate was moved to the fourth champer equipped with the Tbi 9 Fe 7 QC 0 ii alloy target, Ar gas was introduced, and from T big Fe ⁇ C ou by DC sputtering.
- the recording layer 32 having a thickness of 50 nm was formed.
- the Curie temperature of the recording layer 3.2 is 210 ° C. 'Next, the substrate G d 2.
- F e 6 4 C oi 6 moves to the fifth chamber equipped with alloy data one gate Uz DOO, A by introducing r gas DC Supadzu evening Ri by the-ring G d 2 0 F e 6 4 C o 1 A recording auxiliary layer 34 of 6 was formed to a thickness of 6 nm.
- the substrate was moved to the first chamber to form a SiN overcoat layer 22. Further, the substrate was moved to a sixth chamber equipped with an A1Ti alloy alloy containing 1.5 wt% of Ti, and an A1Ti metal layer 24 was formed. The thicknesses of the overcoat layers 2.2 and the metal layers 24 were adjusted by changing the deposition time. A UV curable resin coating was applied on the mail layer 24 to form a magneto-optical recording medium 12C shown in FIG.
- Tables 1 and 2 show the results of comparison of the film formation reference conditions and the C / N ratio of the magneto-optical recording medium 12 C produced by the above method with two substrate grooves. 7 and 8 show photographs of the groove shape.
- the w 2 / w 1 and groove depth of the substrate were changed. ⁇ Shown in 10.
- the groove depth of the substrate in which w2 / w1 in FIG. 9 was also changed was 30 nm, and w2 / wl of the substrate in which the groove depth in FIG. 10 was changed was 0.6.
- the CN ratio sharply drops in a groove shape close to a square with w2 / wl increased.
- w 2 / w 1 is reduced, the CN is reduced because the recording mark is erased due to the thermal influence when the adjacent track is erased.
- the erasing power of the adjacent track was set to be 15% higher than the power capable of completely erasing the recorded marks.
- w 2 / w 1 is preferably in the range of 0.4 to 0.8 where the CN ratio is 45 dB or more.
- the groove depth is preferably in the range of 25 nm to 45 nm where the CN ratio is 45 dB or more.
- FIG. 5 A similar experiment was performed on a normal magneto-optical recording medium 12D having a single recording layer shown in FIG. 5 and a two-layer magneto-optical recording medium 12E having a reproducing layer 39 and a recording layer 36 shown in FIG. Was.
- the conditions of each layer of the medium shown in FIGS. 5 and 6 are the same as those of the CAD medium shown in FIG.
- the results of similar measurements with the recording mark length set to 0.45 ⁇ are shown in Figs.
- Figure 11 shows the w 2 / w 1 dependence of the CN ratio of the normal medium. 2 is the groove depth dependence of the CN ratio of a normal MO medium.
- FIG. 13 shows the w / w1 dependence of the CN ratio of the two-layer film medium, and FIG.
- w 2 / wl preferably has a CN ratio of 45 dB or more in the range of 0.4 to 0.8, and a groove depth of 25 ⁇ where the CN ratio is 45 dB or more!
- a range of ⁇ 45 nm is preferred. It is preferable that the radius of curvature of the land of the land and the group is not so large; even with a chamfer having a sharp corner, the crosstalk can be sufficiently suppressed and the .. CN ratio can be improved.
- Table 3 shows a comparison between the reference conditions of the present invention and the conventional conditions.
- FIG. 15 shows the CN ratio when the Gd composition of the second reproducing layer 28 was changed and the temperature Tc was changed. From FIG. 15, it can be seen that a good CN ratio of 44 dB or more can be obtained when the temperature of the second reproducing layer 28 is in the range of 160 ° C. to 190 ° C.
- FIG. 16 shows a change in the CN ratio with respect to a change in the film thickness of the first reproducing layer 26.
- FIG. 17 shows the change in the CN ratio with respect to the thickness ratio (%) of the second reproducing layer (thickness of the second reproducing layer 28 / film thickness of the first reproducing layer 26). According to FIG.
- the CN ratio sharply decreases when the thickness of the first reproducing layer 26 is less than 25 nm, and the CN ratio gradually decreases when the film thickness is greater than 30 nm. In order to obtain a CN ratio of 44 dB or more, a film thickness of 35 nm or less is preferable.
- the thickness of the second reproducing layer 28 is Depending on the thickness of the first reproducing layer 26, as shown in FIG. 17, the thickness of the second reproducing layer 28 is 30% to 40% of the thickness of the first reproducing layer 26. Good CN ratio can be obtained in the range.
- FIG. 18 shows the dependency of the CN ratio on the thickness of the nonmagnetic blocking layer 30.
- the thickness of the blocking layer 30 When the thickness of the blocking layer 30 is less than 0.5 nm, the exchange coupling force between the recording layer 32 and the reproducing layers 26, 28 increases rapidly, and the recording layer 32 and the reproducing layers 26, 2 A sharp decrease in the CN ratio occurs because the magnetostatic coupling force between the 8 is hindered.
- the nonmagnetic blocking layer 30 when the nonmagnetic blocking layer 30 is thickened, the magnetostatic coupling force is reduced, so that the transferability of the recording mark is reduced and the CN ratio is reduced. Therefore, in order to obtain a good CN ratio, the thickness of the nonmagnetic blocking layer 30 should be 0.5 ⁇ ! ⁇ 2. O nm range is preferred. '
- FIG. 19 shows the dependence of the C—N ratio on the thickness of the overcoat layer 22.
- FIG. 20 shows the dependency of the recording sensitivity on the thickness of the overcoat layer 22.
- the CN ratio decreases and the recording power (Pw) decreases.
- Pw recording power
- the thickness of the overcoat layer 22 is preferably in the range of 5 nm to 15 nm.
- FIG. 21 shows the dependency of the CN ratio on the thickness of the AlTi layer 24, and FIG. 22 shows the dependency of the recording sensitivity on the thickness of the A1Ti layer 24.
- the thickness of the AlTi layer 24 is preferably in the range of 50 nm to 9 O nm.
- the optical disk device of the present invention includes a control unit 40 and an enclosure 41.
- the control unit 40 includes an MPU 42 for overall control of the optical disk device, an interface 47 for exchanging commands and data with a higher-level device, and an optical disk medium.
- Optical disk controller (0 DC) 44 that performs processing required for data read / write, digital's signal A null processor (DSP) 46 and a buffer memory 48 are provided.
- the buffer memory 48 is shared by the MPU 42, the optical disk controller 44, and the upper interface 47.
- the optical disk controller 44 is provided with a formatter 44a and an ECC processing unit 44b.
- the formatter 44a divides the NRZ write data into units of one sector of the medium to generate a recording format.
- the ECC processing unit 44b generates an ECC code for each sector, one day, and one night, attaches it to the recording format, and generates and adds a CRC code if necessary. Further, the sector data that has been subjected to the ECC encoding is converted into, for example, a 1-7 RLL code.
- LBA logical block address
- This LBA is programmed in advance according to the recording capacity of the optical disc medium, and this program is stored in the format 44a in the form of firmware.
- a program for converting the LBA into a track address and a cell address is stored in the format address 44a.
- the number of the defective sector found during physical formatting of the optical disk medium is also stored in the formatter 44a.o '
- the demodulated sector read data is inversely transformed by 1 to 7 RLL, CRC is checked by the ECC processing unit 44b, error detection and correction is performed, and the NRZ data of one section per unit is decoded by the format unit 44a. Concatenate and transfer to upper device as stream of NRZ read data.
- the light LSI circuit 50 is controlled by the optical disk controller 44.
- the LSI circuit 50 has a light modulation section 51 and a laser diode control circuit 52.
- the output of the laser diode control circuit 52 is provided to a laser diode unit 60 provided in the optical unit on the enclosure 41 side.
- the laser diode 60 has a laser diode 60a and a monitoring photodetector 6Ob.
- the write modulation section 51 converts the write data into a data format of a PPM record or a PWM record.
- the optical disk device of the present invention has a capacity of 128 MB and 230 MB. MB, 5 4 0 M Any of B, 640 MB, 1.3 GB and the optical recording medium of the present invention can be used. If the numerical aperture (NA) of the objective lens is 0.55 or more, backward compatibility with the optical recording medium of the present invention is possible using a blue-violet laser having a wavelength of 405 nm.
- NA numerical aperture
- bit position recording which records data according to the presence or absence of marks on the media.
- the recording format of the medium is CAV (Constant Angular 'Virosity).
- CAV Constant Angular 'Virosity
- PWM recording pulse width recording
- the optical disk apparatus of the present invention can support M0 cartridge media having a recording capacity of 128 MB, 230 MB, 540 MB, 640 MB, or 1.3 GB. is there. Therefore, when the M0 force cartridge is squeezed into the optical disk drive, first, the ID part formed by a plurality of pits and repeats is read into the header part of the medium, and the pit is read. The MPU 42 recognizes the type of the medium as well as the interval, and notifies the write LSI 5 of the recognition result. In addition, when a CAD type MO power cartridge is ringed on the optical disk device, a predetermined set value is set for this medium by the MPU 42, and the set value is written to the write LSI 5. Notify 0.
- the sector-one write data from the optical disk controller 44 is converted to PPM recording data by the write modulation section 51 for a 128 MB or 230 MB medium, and is converted to 540 MB, 640 MB N 1. If it is a 3 GB medium or the optical recording medium of the present invention, it is converted into PWM recording data.
- the PM recording data or PWM recording data converted by the light modulation section 51 is supplied to a laser diode control circuit 52, which drives the laser diode 60a to write data on the medium.
- the read LSI circuit 54 has a read demodulation unit 55 and a frequency synthesizer 56.
- the return light of the laser beam emitted from the laser diode 60a is detected by the ID / MO detector 62, and is passed through a head amplifier 64 as an ID signal and a MO signal as a lead LSI circuit 54. Is input to The header address information is detected as an ID signal, and the identifier, track address, and sector address are consecutive. By reproducing the data, the position of the light beam on the medium can be recognized.
- the read demodulation unit 55 of the read LSI circuit 54 is provided with circuit functions such as an AGC circuit, a filter, and a sector mark detection circuit.
- the read demodulation unit 55 calculates the read clock and read data from the input ID signal and MO signal. Create and demodulate the PMR or PWM recording data to the original NRZ data. Since the zone CAV is used as the control for the spindle clock 70, the MPU 42 generates a clock frequency corresponding to the zone from the frequency synthesizer 56 built in the read LSI circuit 5 to the clock synthesizer 56. The setting control of the circle ratio is performed.
- the frequency synthesizer 56 is a PLL circuit having a programmable frequency divider, and generates a reference clock having a predetermined specific frequency according to a zone (band) position of a medium as a read clock. That is, the frequency synthesizer 56 is composed of a PLL circuit having a programmable frequency divider, and the frequency according to the frequency division ratio (m / n) set by the MPUA 2 according to the zone number. fo reference clock,
- the dividing value n of the denominator of the dividing ratio (m / .n) is 128 MB, 230 MB, 540 MB, 640 MB N 1.3 GB medium or the present invention. This is a unique value according to the type of the optical recording medium.
- the numerator division value m changes according to the zone position of the medium, and is prepared in advance as table information of a value corresponding to the zone number of each medium.
- the read LSI circuit 54 further outputs a MOX ID signal E 4 to the DSP 46.
- the MO XID signal E 4 is a signal that falls to the H level (bit 1) in the MO area, which is the overnight area, and falls to the L level (bit 0) in the ID area where the pre-pits are formed. This signal indicates the physical positions of the M0 area and the ID area on the recording track of the medium.
- the read data demodulated by the read LSI 54 is given to the optical disk controller 44, and after inverse conversion of 1-7 RLL, it is subjected to CRC check and ECC processing by the encoding function of the ECC processing section 44b. Is restored to the NRZ section.
- the data is transferred to the higher-level device by the higher-level interface 47 via the buffer memory 48.
- a detection signal of a temperature sensor 66 provided on the enclosure 41 side via the DSP 46 is given.
- the MPU 42 controls the read, write, and erase light emission powers of the laser diode control circuit 52 to optimal values based on the environmental temperature inside the device detected by the temperature sensor 66.
- the laser diode control circuit 52 controls, for example, the light power to 6. O mW and the read power to 2. O mW. From 128 MB media to 1.3 GB media performs optical modulation recording.
- both optical modulation recording and magnetic field modulation recording can be adopted.
- the MPU 42 further controls the spindle motor 70 provided on the enclosure 41 side by the driver 68 through the DSP 46. Since the recording format of the M0 force zone is zone CAV, the spindle motor 70 is rotated at a constant speed of, for example, 450 rpm. The linear velocity of the medium is 7.5 mZs when recording and reproducing data.
- the MPU 42 further controls the electromagnet 74 provided on the enclosure 41 side via the driver 72 via the DSP 46.
- the electromagnet 74 is located on the side opposite to the beam irradiation side of the 0-power load, which is loaded in the device, and supplies an external magnetic field to the medium.
- the DSP 46 has a servo function for positioning the laser beam from the laser diode 60a with respect to the medium, a seek control unit 57 for seeking on the target track and on-tracking, and a beam for the target track. It has an on-track control unit 58 that follows the track after the vehicle is pulled in.
- an optical unit on the enclosure 41 side is provided with a FES detector 75 for receiving the beam return light from the medium, and the FES detection circuit 76 is used as the FES detector 7
- a focus error signal is created from the light receiving output of 5 and input to DSP 46.
- the optical unit on the side of the enclosure 4 1 is provided with a detector 3 for receiving the beam return light from the medium, and the TES detection circuit 7 8 detects the tracking error from the light output of the detector 7 for TES 7.
- One signal E 1 is created and input to DSP 46.
- the tracking error signal E1 is input to a TZC detection circuit (track zero crossing detection circuit) 80, and a track zero crossing pulse E2 is created and input to the DSP 46.
- DSP 46 also controls the position of the beam spot on the media. It controls the driving of the focus actuator 90, the lens actuator 94, and the VCM 98 via the drivers 88, 92, and 96.
- a spindle motor 70 is provided in the housing 100, and when the MO cartridge 106 is inserted into the apparatus through the inlet door 104, the internal M 0 The medium 12 is chucked to the hub of the spindle of the spindle motor 70, and the MO medium 12 is loaded.
- a carriage 108 that is movable by a VCM 98 in a direction traversing the track of the medium is provided below the mouthed MO medium 12.
- An objective lens 110 and a beam rising prism 114 are mounted on the carriage 108.
- the laser beam from the laser diode 60a provided in the fixed optical system 1 12 is reflected by the beam rising prism 1 14 and is incident on the objective lens 1 10 to record the M 0 medium 1 2
- the beam spot is focused on the surface.
- the objective lens 110 is moved in the optical axis direction by the focus actuator and the actuator 90 shown in Fig. 23: i enclosure 41.
- the track work unit 94 can move in the radial direction across the medium track within a range of several ten tracks, for example.
- An electromagnet 102 for applying an external magnetic field to the medium is provided above the loaded M 0 medium 12.
- the present invention even when a blue-violet laser with a small beam spot is used for recording and reproducing data, a land and a group having a good CN ratio and a sufficiently small crosstalk characteristic can be obtained. It is possible to provide an optical recording medium having a recording track as a reference. Further, it is possible to provide an optical disc device suitable for recording / reproducing data on / from such an optical recording medium.
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002304136A AU2002304136A1 (en) | 2002-05-31 | 2002-05-31 | Optical recording medium, and optical storage device |
KR1020047017679A KR100636726B1 (ko) | 2002-05-31 | 2002-05-31 | 광 기록 매체 및 광 기억 장치 |
CNB028289579A CN1307634C (zh) | 2002-05-31 | 2002-05-31 | 光记录媒体和光记录装置 |
JP2004509942A JPWO2003102943A1 (ja) | 2002-05-31 | 2002-05-31 | 光記録媒体及び光記憶装置 |
PCT/JP2002/005382 WO2003102943A1 (fr) | 2002-05-31 | 2002-05-31 | Support d'enregistrement optique, et dispositif de stockage optique |
EP02730850A EP1511028A4 (en) | 2002-05-31 | 2002-05-31 | OPTICAL RECORDING MEDIUM AND OPTICAL STORAGE DEVICE |
TW091114383A TWI234154B (en) | 2002-05-31 | 2002-06-28 | Optical recording medium, magnetic-optical recording medium and optical memory apparatus |
US10/976,125 US20050088954A1 (en) | 2002-05-31 | 2004-10-28 | Optical recording medium and optical storage device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2002/005382 WO2003102943A1 (fr) | 2002-05-31 | 2002-05-31 | Support d'enregistrement optique, et dispositif de stockage optique |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/976,125 Continuation US20050088954A1 (en) | 2002-05-31 | 2004-10-28 | Optical recording medium and optical storage device |
Publications (1)
Publication Number | Publication Date |
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WO2003102943A1 true WO2003102943A1 (fr) | 2003-12-11 |
Family
ID=29606647
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/005382 WO2003102943A1 (fr) | 2002-05-31 | 2002-05-31 | Support d'enregistrement optique, et dispositif de stockage optique |
Country Status (8)
Country | Link |
---|---|
US (1) | US20050088954A1 (ja) |
EP (1) | EP1511028A4 (ja) |
JP (1) | JPWO2003102943A1 (ja) |
KR (1) | KR100636726B1 (ja) |
CN (1) | CN1307634C (ja) |
AU (1) | AU2002304136A1 (ja) |
TW (1) | TWI234154B (ja) |
WO (1) | WO2003102943A1 (ja) |
Families Citing this family (4)
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JP2007250136A (ja) * | 2006-03-17 | 2007-09-27 | Toshiba Corp | 光ディスク及び光ディスク装置 |
JP2008142895A (ja) * | 2006-12-05 | 2008-06-26 | Fujifilm Corp | モールド構造体 |
TWI457839B (zh) * | 2012-06-04 | 2014-10-21 | Pegatron Corp | 擴增實境的感應系統、擴增實境的感應裝置及擴增實境的感應方法 |
CN107292924B (zh) * | 2017-06-02 | 2019-08-30 | 镇江超纳仪器有限公司(中外合资) | 一种对激光加工形成的激光槽的特征自动识别方法 |
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JPH07296434A (ja) * | 1994-01-14 | 1995-11-10 | Fujitsu Ltd | 光磁気記録媒体及び該媒体に記録された情報の再生方法 |
WO1997022969A1 (fr) * | 1995-12-20 | 1997-06-26 | Hitachi Maxell, Ltd. | Support d'enregistrement magneto-optique et procede de reproduction de ce support |
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JPH1011801A (ja) * | 1996-06-28 | 1998-01-16 | Hitachi Ltd | 光ディスク基板 |
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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 |
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JP2879185B2 (ja) * | 1993-04-16 | 1999-04-05 | ティーディーケイ株式会社 | 光磁気ディスク |
JP2697555B2 (ja) * | 1993-05-26 | 1998-01-14 | 松下電器産業株式会社 | 光情報記録媒体 |
US6423430B1 (en) * | 1995-07-17 | 2002-07-23 | Samsung Electronics Co., Ltd. | Magneto-optical recording medium for short wavelength |
US6054199A (en) * | 1996-04-10 | 2000-04-25 | Hitachi Maxell, Ltd. | Optical recording medium |
JPH11250504A (ja) * | 1998-02-27 | 1999-09-17 | Sony Corp | 光記録媒体及びその製造方法 |
JP4041629B2 (ja) * | 1999-10-21 | 2008-01-30 | 富士フイルム株式会社 | 光記録媒体 |
US7012857B2 (en) * | 2000-05-31 | 2006-03-14 | Matsushita Electric Industrial Co., Ltd. | Magneto optical recording medium having a multilayer recording film of different thickness |
ATE459959T1 (de) * | 2000-11-20 | 2010-03-15 | Sony Corp | Optisches aufzeichnungsmedium und optisches plattengeraet |
JP4244527B2 (ja) * | 2001-04-06 | 2009-03-25 | ソニー株式会社 | 光ディスクの製造方法 |
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2002
- 2002-05-31 JP JP2004509942A patent/JPWO2003102943A1/ja not_active Withdrawn
- 2002-05-31 AU AU2002304136A patent/AU2002304136A1/en not_active Abandoned
- 2002-05-31 WO PCT/JP2002/005382 patent/WO2003102943A1/ja active Application Filing
- 2002-05-31 KR KR1020047017679A patent/KR100636726B1/ko not_active IP Right Cessation
- 2002-05-31 CN CNB028289579A patent/CN1307634C/zh not_active Expired - Fee Related
- 2002-05-31 EP EP02730850A patent/EP1511028A4/en not_active Withdrawn
- 2002-06-28 TW TW091114383A patent/TWI234154B/zh not_active IP Right Cessation
-
2004
- 2004-10-28 US US10/976,125 patent/US20050088954A1/en not_active Abandoned
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JPH07296434A (ja) * | 1994-01-14 | 1995-11-10 | Fujitsu Ltd | 光磁気記録媒体及び該媒体に記録された情報の再生方法 |
WO1997022969A1 (fr) * | 1995-12-20 | 1997-06-26 | Hitachi Maxell, Ltd. | Support d'enregistrement magneto-optique et procede de reproduction de ce support |
JPH09288853A (ja) * | 1996-04-22 | 1997-11-04 | Sharp Corp | 光磁気記録媒体 |
JPH1011801A (ja) * | 1996-06-28 | 1998-01-16 | Hitachi Ltd | 光ディスク基板 |
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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 |
Also Published As
Publication number | Publication date |
---|---|
TWI234154B (en) | 2005-06-11 |
JPWO2003102943A1 (ja) | 2005-10-06 |
CN1307634C (zh) | 2007-03-28 |
KR20040111574A (ko) | 2004-12-31 |
AU2002304136A1 (en) | 2003-12-19 |
EP1511028A1 (en) | 2005-03-02 |
CN1625773A (zh) | 2005-06-08 |
KR100636726B1 (ko) | 2006-10-23 |
EP1511028A4 (en) | 2008-03-19 |
US20050088954A1 (en) | 2005-04-28 |
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