WO2000021081A1 - Support d'enregistrement d'information et dispositif d'enregistrement d'information - Google Patents
Support d'enregistrement d'information et dispositif d'enregistrement d'information Download PDFInfo
- Publication number
- WO2000021081A1 WO2000021081A1 PCT/JP1999/005444 JP9905444W WO0021081A1 WO 2000021081 A1 WO2000021081 A1 WO 2000021081A1 JP 9905444 W JP9905444 W JP 9905444W WO 0021081 A1 WO0021081 A1 WO 0021081A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- information recording
- recording medium
- layer
- recording
- thermal diffusion
- Prior art date
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Classifications
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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
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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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B7/2578—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
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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
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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
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- 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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- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
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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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- 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
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- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24306—Metals or metalloids transition metal elements of groups 3-10
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- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24308—Metals or metalloids transition metal elements of group 11 (Cu, Ag, Au)
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- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/2431—Metals or metalloids group 13 elements (B, Al, Ga, In)
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- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24312—Metals or metalloids group 14 elements (e.g. Si, Ge, Sn)
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- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24314—Metals or metalloids group 15 elements (e.g. Sb, Bi)
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- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24316—Metals or metalloids group 16 elements (i.e. chalcogenides, Se, Te)
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- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25706—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing transition metal elements (Zn, Fe, Co, Ni, Pt)
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- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25708—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing group 13 elements (B, Al, Ga)
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- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/2571—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing group 14 elements except carbon (Si, Ge, Sn, Pb)
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- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25711—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing carbon
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- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25713—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing nitrogen
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- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25715—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing oxygen
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- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25716—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing sulfur
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- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25718—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing halides (F, Cl, Br, l)
-
- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
- G11B7/2534—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins polycarbonates [PC]
Definitions
- the present invention relates to an information recording medium on which information is recorded by irradiating an energy beam, and to the above information recording medium, and in particular, to rewriting of a phase-change optical disk or a magneto-optical disk It relates to a possible optical disk.
- the present invention relates to an information recording apparatus that satisfactorily reproduces or records the information recording medium.
- the information recording medium is sometimes referred to as a phase-change optical disk, a magneto-optical disk, or simply an optical disk.
- information recording is performed in which information is recorded by generating heat by irradiating an energy beam and causing a change in an atomic arrangement or a magnetic moment by the heat. Since it is applicable as long as it is applicable to a medium, it is also effective for information recording media other than a disc-shaped information recording medium such as an optical card, regardless of the shape of the information recording medium.
- the above-mentioned energy beam may be expressed as a laser beam or simply a laser beam.
- the present invention provides an energy beam capable of generating heat on an information recording medium. As long as it is a beam, it can be applied to an information recording medium recorded by an energy beam that is not generally regarded as light, such as an electron beam or an ion beam. Background art
- an uneven surface is provided on the plastic substrate for tracking one laser beam.
- a method of recording information in a concave portion or a convex portion has been common.
- a method of recording information on each of the concave and convex portions using the above-mentioned concave and convex shape has been developed.
- the above-mentioned concave-convex convex portion is called a land, and the concave-convex concave portion is defined as a group.
- the leakage of the reproduced signal occurs from the adjacent information recording track (the group for the land or the land for the group).
- the reproduction signal from the information recorded in the group leaks in and the information recorded in the land cannot be reproduced accurately. Occurs.
- the leakage of the reproduced signal from the information recorded on the adjacent information recording track is called crosstalk.
- a heat diffusion layer having a high thermal conductivity is provided on the side of the magnetic layer opposite to the laser beam incident side, but the distance between the magnetic layer and the heat diffusion layer is 20 nm. Since it is smaller than the following, heat is easily diffused to the adjacent information recording track via the thermal diffusion layer.
- Example 2 Although the distance between the magnetic layer and the thermal diffusion layer is relatively thick at 80 nm, a metal magnetic layer is used as the recording layer (in the present invention, the atomic arrangement change, Alternatively, a functional thin film that changes its electronic state is referred to as a recording layer.), And the total thickness of these three layers is extremely large at 145 nm. For this reason, it was found that heat diffused in the recording layer and erased information recorded on the adjacent information recording track.
- the step (groove depth) between the center of the concave portion and the center of the convex portion of the above-mentioned uneven shape is usually set to / 8 when the wavelength of the laser forming the laser beam is human. Is done. This is because the largest tracking error signal can be obtained when the groove depth is / 8.
- the land group recording method has been devised, so the above groove depth is more than / 7 In some cases (conventional example 3: JP-A-6-338064).
- the feature of this method is that even when the track pitch is narrowed to about 60% of the laser beam spot, crosstalk from the adjacent information recording track (adjacent information recording track) can be achieved. Signal leakage from the sensor).
- a laser with a laser wavelength ( ⁇ ) of 645 to 66 O nm has a lens aperture of NA of 0. Since the aperture is narrowed down by the lens shown in Fig. 6, recording and playback are performed using a laser beam spot of 0.97 to 0.99 m (0.9 f / NA). be able to. Therefore, crosstalk can be canceled even when the track pitch is 0.7 m or less.
- the 2.6 GB / side DVD-RAM standard specifies a track pitch of 0.74—m. The only reason for this is that if the track pitch is further reduced, a cross loss will occur.
- the film structure of the rewritable optical disk is such that a dielectric protective layer such as Si 3 N 4 or ZnS-Si 02 (hereinafter referred to as a lower protective layer) is formed on the plastic transparent substrate.
- a recording layer typified by a TbFeCo-based magnetic film, or a chalcogenide-based phase-change film such as GeSbTe, etc .;
- This is a multiple interference structure in which heat diffusion control layers are sequentially stacked, and a metal reflection film (hereinafter, referred to as a heat diffusion layer) such as an A1 alloy or an Au alloy is provided.
- the characteristic of this structure is that the lower protective layer, the recording layer, the thermal diffusion control layer, the refractive index of the thermal diffusion layer, and the film thickness are set to appropriate values, so that the optical properties of the recording layer are improved. By reflecting the light while emphasizing the change in the physical property value, a large carrier-to-noise ratio is obtained.
- the role of the thermal diffusion layer passes through the lower protective layer, recording layer, and thermal diffusion control layer
- the reflected light is reflected back to the light incident side. Therefore, it is required to have high reflectivity optically.
- the thermal conductivity of metals having high reflectivity such as Al, Au, Pd, Pt, Cu, and Ag, is generally extremely large, the following problems occur.
- the thermal diffusion layer is made to have high thermal conductivity, it means that the heat generated in the recording layer will be easily diffused into the thermal diffusion layer, so the temperature of the recording layer will not rise easily and recording will be performed. There is a problem that the laser power required for recording increases (recording sensitivity decreases) (recording sensitivity problem).
- thermal diffusion layer closer to the recording layer is set to low thermal conductivity. It is known to provide a heat diffusion layer having a relatively large thermal conductivity on the opposite side (Conventional example 4: Japanese Patent Application Laid-Open No. Heisei 3-27202).
- the low thermal conductivity metal film has the above-mentioned optical characteristics as a reflection film. It was difficult to make the signal modulation degree of the reproduced signal, CNR (carrier-to-noise ratio), the overall reflectivity of the above multiple interference structure, etc., to sufficiently large values because they could not be sufficiently satisfied. (Low CNR problem).
- the recording film of the rewritable optical disc is a phase-change recording material
- these information recording media are usually provided on a substrate with a protective layer, a GeSbTe-based recording film, a protective layer, and a reflective layer. It consists of layers, and the reflectivity is higher in the crystalline state than in the amorphous state. As a result, The absorptance in the recording film is higher in the amorphous state. If overwriting is performed in this state, the newly recorded mark will be larger than the normal size because the amorphous recording mark part will absorb light more easily than the crystalline state part and the temperature will rise more easily. And the reproduced signal is distorted.
- An object of the present invention is to reduce the CNR, overwrite characteristics, and recording sensitivity even in high-density recording where the track pitch is 70% or less of the laser beam spot diameter.
- an object of the present invention is to provide an information recording medium that does not cause cross lasing.
- the object of the present invention is to provide a CNR, an overwrite characteristic, and a recording sensitivity even in a high-density recording in which a track pitch is 70% or less of a laser beam spot diameter. Narrow without lowering An object of the present invention is to realize an information recording medium which can realize a quick pitch and has a high recording density corresponding to an information recording / reproducing apparatus using an inexpensive semiconductor laser.
- an object of the present invention is to provide a narrower recording medium without deteriorating the CNR and recording sensitivity even in high-density recording where the track pitch is 70% or less of the laser beam spot diameter.
- An information recording medium that can achieve track pitching and achieves good overwrite characteristics even in high-density recording where the recording mark length is less than half of the energy beam spot diameter. It is to provide
- the object of the present invention is to provide a recording medium having a CN, an overwrite characteristic, and a recording sensitivity even in a high-density recording in which a track pitch is 70% or less of a laser beam spot diameter.
- the present invention is to provide an information recording medium that can achieve a narrow track pitch without lowering the readout rate and that does not degrade the reproduction signal even after rewriting a large number of times of about 100,000 times.
- an object of the present invention is to reduce the CN, the overwrite characteristics, and the recording sensitivity even in high-density recording such that the track pitch is 70% or less of the laser beam spot diameter. It is possible to provide an information recording medium that can achieve a narrow track pitch in a short time, and that does not cause a difference in recording sensitivity between recording information in a land and recording information in a group. And Disclosure of the invention
- the following information recording medium may be used.
- an information recording medium in which information (recording mark) is recorded by changing the atomic arrangement by irradiation of a relatively moving energy beam and / or by changing the electronic state, A plurality of information recording tracks are provided in parallel with the direction of relative movement. A step is provided between the information recording tracks, one or more types of information recording thin films are provided as the recording layer, and one or more types of thermal diffusion control layers are provided on the side of the recording layer opposite to the energy beam incident side.
- the thermal diffusion control layer is provided with a thermal diffusion layer having a composition different from that of the thermal diffusion control layer.
- CNR multiple rewrites Improved durability against deterioration, and even when information is recorded in both the land and the group, the quality of the reproduced signal obtained from the land and the group Information that does not differ significantly Medium realizes. Also, even in high-density recording where the track pitch is 70% or less of the laser beam spot diameter, the CNR, overwrite characteristics, and recording sensitivity can be reduced without deteriorating. An information recording medium that can realize track pitching and that does not cause a difference in recording sensitivity between when recording information in the land and when recording information in a group is realized.
- the sum of the film thicknesses of one or more of the above-mentioned recording layers is 5 nm or more and 20 nm or less, optical interference between the heat diffusion layer and the recording layer because one laser beam easily penetrates the recording layer. Since the effects can be used effectively, an information recording medium with a high CNR can be obtained. Further, when the sum of the film thicknesses of the one or more kinds of thermal diffusion control layers is equal to or greater than the step between the information recording tracks and equal to or less than 300 nm, it is more preferable that When the thickness is 70 nm or more and 150 nm or less, productivity is improved in addition to the above effects. In addition,
- the information recording medium is characterized by having an information recording track on each It is possible to realize a narrow track of information recording track without increasing the delay.
- the information recording medium includes a transparent substrate on an energy beam incident side, the energy beam is a laser beam, and the laser beam is When the laser wavelength is human and the refractive index of the transparent substrate at wavelength ⁇ is n, the step between the center of the concave part and the center of the convex part
- the (groove depth) is not less than / (7n) and not more than person / (6.2n), it is possible to reduce the crosstalk. It is possible to reduce the cross rate without lowering the recording sensitivity, CNR, and endurance of multiple rewrites. Also,
- the information recording medium according to any one of (4) and (5), wherein the information recording medium has a transparent substrate on an energy beam incident side, and the energy beam is a laser beam.
- the laser wavelength of the laser beam is 630-660 nm, and the lens numerical aperture for forming the laser beam is 0.57-0.643.
- Refraction of the transparent substrate in the wavelength range Equipped with a transparent substrate with a ratio of 1.45 to 1.65, a track pitch of 0.615 ⁇ 0.03 / 111, and a groove depth of 59 to 6711.
- An information recording medium characterized by the fact that it can be used for an information recording / reproducing apparatus using an inexpensive semiconductor laser, such as a DVD-RAM with a recording capacity of 4.7 GB, is used.
- An information recording medium with a high recording density can be realized.
- thermo diffusion control layer comprises a metal oxide, carbide, nitride, sulfide, or selenide.
- the recording layer is not limited to a phase-change recording layer whose main component is Ge, Sb, Te, In, Ag, etc., for example, Tb, Fe, Co, Dy, G Even in recording on a magneto-optical recording layer containing d or the like as a main component, it is possible to reduce the cross-laze without lowering the recording sensitivity, CNR, and resistance to multiple rewrites.
- the information recording medium according to any one of (1) to (12), wherein the crystal is converted into an amorphous form and / or an amorphous form with the change in the atomic arrangement.
- the information pitch (recording mark) is recorded by the change from crystal to crystal, and the track pitch can be controlled by using a laser beam spot. Even in high-density recording with a diameter of 70% or less, the track pitch can be reduced without lowering the CNR, overwrite characteristics, and recording sensitivity.
- DVD-RAM, DVD-RW, and DVD-R it is possible to obtain information recording media with excellent compatibility with read-only optical discs (for example, DVD-R0M).
- thermal buffer layer is a mixture of a metal and a metal oxide, a metal sulfide, a metal nitride, or a metal carbide.
- the information recording medium according to (13), comprising at least a plurality of heat diffusion control layers, wherein the content of the S element is smaller than that of the other heat diffusion control layers.
- the present invention employs a structure in which a plurality of thin films are stacked to take advantage of the characteristics of each thin film, the layers do not necessarily have to be strictly separated, for example, about 5 nm or less. If so, with boundaries between layers Even if the composition ratio in the vicinity changes continuously, the effect of the present invention is not lost.
- the composition of each film is shown in atomic%.
- the energy beam spot diameter in the present invention indicates a diameter of a region where the intensity is 1 / e 2 or more of the center intensity of the beam spot. Further, the present invention has an effect of improving the recording density in the direction parallel to the information recording track (a good overwrite characteristic is also obtained when recording a recording mark of 50% or less of the energy beam diameter). And the effect of improving the recording density in the vertical direction of the information recording track (even when the track pitch is set to 70% or less of the energy beam diameter). It has the effect of suppressing lossy loss and crosstalk.
- the energy beam spot diameter means, for example, when the beam spot shape is other than a circle such as an ellipse, the intensity is the beam spot in a direction in which each effect is exhibited. The width of the area where 1 / e 2 or more of the center intensity of the area is shown.
- the interface layer is present between the recording layer and the thermal diffusion control layer and stabilizes the interface of the recording layer.
- At least the content of the S element is one of the thermal diffusion control layers.
- the layer is smaller than the content of one type of layer and has a film thickness of 2 to 1 O nm. For example, if the surface of the recording layer is changed by some kind of treatment (nitridation, oxidation, etc.), the recording layer is called an interface layer if its composition is clearly different from that of the thermal diffusion control layer. .
- the thermal diffusion control layer has a film thickness of at least 10 nm and exists between the recording layer and the thermal diffusion layer, and is an oxide, carbide, nitride, or sulfide that transmits an energy beam. And a layer mainly composed of selenide, and at least k is a complex refractive index at the wavelength of the energy beam]! And k is -0.1 or more. Further, the thermal buffer layer exists at least between the thermal diffusion control layer and the thermal diffusion layer, and k of the complex refractive indices n and k is smaller than -0.1 and the film thickness is 10 O nm or less.
- FIG. 1 is a structural diagram of the information recording medium of the present invention
- FIG. 2 is a conceptual diagram for explaining one embodiment of the present invention
- FIG. FIG. 4 is a conceptual diagram for explaining an example
- FIG. 4 is a diagram showing a relationship between a film thickness of a heat diffusion control layer and a distance between a heat diffusion layer and an adjacent information recording track according to the present invention.
- FIG. 5 is a conceptual diagram for explaining one embodiment of the present invention
- FIG. 6 is a conceptual diagram for explaining one embodiment of the present invention
- FIG. FIG. 8 is a conceptual diagram for explaining one embodiment of the present invention
- FIG. 8 is a conceptual diagram for explaining one embodiment of the present invention
- FIG. 8 is a conceptual diagram for explaining one embodiment of the present invention
- FIG. 9 is a conceptual diagram for explaining one embodiment of the present invention.
- FIG. 1 is a structural diagram of the information recording medium of the present invention
- FIG. 2 is a conceptual diagram for explaining one embodiment of the present invention
- FIG. FIG. 4 is
- FIG. 10 is a structural cross-sectional view of an example information recording medium
- FIG. 10 is a block diagram of an information recording / reproducing apparatus used in an embodiment of the present invention
- FIG. 12 is a diagram showing the relationship between the track pitch of the information recording medium and the rise of the jump due to the cross-raz
- FIG. 12 shows the groove depth of the information recording medium in one embodiment of the present invention
- FIG. 13 is a diagram showing a relationship between jitter and jitter due to crosstalk.
- FIG. 13 shows a layout of a recording mark and an information recording track of an information recording medium according to an embodiment of the present invention.
- FIG. 14 is a diagram showing the relationship between the thermal conductivity of the thermal diffusion control layer of the information recording medium and the cross-lease temperature holding time in one embodiment of the present invention.
- FIG. 15 is a diagram showing the relationship between the film thickness of the thermal diffusion layer of the information recording medium and the cross-laze temperature holding time in one embodiment of the present invention.
- FIG. 16 is a diagram showing one embodiment of the present invention. Conductivity and Cross-Laze Temperature of Thermal Diffusion Layer of Information Recording Medium Retention time relationship BRIEF DESCRIPTION OF THE DRAWINGS FIG.
- d rh The shortest distance between the recording part of the adjacent information recording track and the thermal diffusion layer dr: The film thickness of the recording layer
- the cross-ray erases the information recorded on the adjacent information recording track by transmitting the heat generated when a laser beam is applied to the recording layer to record a recording mark, and traveling through the laminated thin film. This is one of the biggest obstacles to high-density recording.
- FIG. 1 shows the basic structure of the information recording medium of the present invention.
- the first information recording member is lower protective layer 2 on the substrate 1 groove depth is provided the information recording preparative rack groove shape of d g, recording layer 3, the thermal diffusion control layer 4, the thermal diffusion layer 5 is a structure in which layers are sequentially stacked.
- an information recording member having a similar structure including a substrate 1 ′, a lower protective layer 2 ′, a recording layer 3 ′, a heat diffusion control layer 4 ′ and a heat diffusion layer 5 ′ is attached via an adhesive 6. Is
- FIG. 2 and Fig. 3 schematically show the thermal diffusion in the cross-sectional direction when the recording layer 3 is heated by irradiating a laser beam from the substrate 1 side. This is shown in the figure.
- FIG. 3 is the thickness d of the thermal diffusion control layer 4 is the groove depth
- the case where the thickness is larger than d g (structure B: the present invention) is shown.
- FIG. 2 will be described.
- cormorants I previously described thickness d of the thermal diffusion control layer 4 is made even rather thin Ri by the groove depth d g.
- the energy beam applied to the recording layer 3 by the objective lens 7 generates heat in the recording layer 3. Further, the heat generated in the heat generating portion 9 of the recording layer 3 diffuses through the heat diffusion layer 5.
- the shortest distance d rh between the thermal diffusion layer 5 and the recording section 11 of the adjacent information recording track is small, and the adjacent information recording track is small. Since the thermal diffusion layer is present so as to surround the recording portion 11 of the recording medium, the cross laze is likely to occur due to the influence of the heat diffusing the thermal diffusion layer 5.
- the thermal diffusion layer 5 does not exist so as to surround the recording portion 11 of the adjacent information recording track.
- FIG. 4 is a calculation example of the relationship between the shortest distance d rh between the recording section 11 of the adjacent information recording track and the thermal diffusion layer 5 and the film thickness dhe of the thermal diffusion control layer 4.
- the film thickness d of the thermal diffusion control layer 4 is equal to or greater than the groove depth d g , the shortest distance d rh between the thermal diffusion layer 5 and the recording section 11 of the adjacent information recording track sharply increases. .
- the recording portion 11 of the adjacent information recording track is Insensitive to heat diffusing diffusion layer 5.
- the thermal diffusion layer 5 does not exist so as to surround the recording part 11 of the adjacent information recording track as in the case of FIG.
- the effect of the heat generated in the land on the recording portion of the groove can be described in the same manner as in the case of recording in the group.
- the present invention from the land to the group Heat flow from the heat sink or the heat flow from the grove to the land can be suppressed. In this way, if the thickness of the thermal diffusion control layer is equal to or greater than the groove depth, the cross laze can be reduced.
- the land group recording method is adopted, When recording information in both groups, This has the effect of reducing the laser.
- FIG. 7 is a diagram thickness d r is the state of the thermal diffusion when irradiated with a laser beam to a group when the thickness is larger Ri by the groove depth d g was shown schematically in the recording layer 3.
- the distance between the heat generating portion 9 of the recording layer 3 of the groove and the recording portion 11 of the adjacent information recording track becomes smaller as compared with FIGS. 2 and 3, and furthermore,
- the amount of heat diffusing in the recording layer having a relatively high thermal conductivity becomes large, the cross laze is easily generated.
- FIG. 8 is a diagram thickness d r is shows how the thermal diffusion when irradiated with a laser beam to the run-de if thicker Ri by groove depth d g schematically the recording layer 3. Also in this case, the distance between the heat generating portion 9 of the recording layer 3 of the land and the recording portion 11 of the adjacent information recording track becomes smaller as compared with FIGS. 5 and 6, and furthermore, However, since the amount of heat diffusing in the recording layer having a relatively high thermal conductivity becomes large, a cross-lease occurs easily.
- the thickness d of the thermal diffusion control layer 4 is smaller than the groove depth d g and the land is irradiated with a laser beam, as shown in FIG.
- the thickness d of the thermal diffusion control layer 4 is smaller than the groove depth d g , and the recording sensitivity is reduced as compared with the case where a single laser beam is applied to the group.
- the lower protective layer 2 and the substrate 1 having relatively low thermal conductivity are present on the side surface of the heat generating portion 9 of the recording layer 3, whereas in the case of FIG. This is because a heat diffusion layer having a relatively high thermal conductivity exists on the side surface of the heat generating portion 9. This causes a difference in recording sensitivity between the land and the group, which is a major problem in the design of the information recording / reproducing apparatus.
- the difference between the land and groove recording sensitivities can also be reduced.
- Figure 3 when the thickness d of the heat spreading control layer 4 to cormorants good of Figure 6 is thicker Ri by the groove depth d s, when recording to the group, also a case of recording a run-de, This is because the heat generating portion 9 of the recording layer 3 has a lower protective layer having relatively low thermal conductivity or a heat diffusion control layer on the side surface.
- the inventors studied the thermal conductivity of the recording layer, the thermal diffusion control layer, and the thermal diffusion layer, and examined the relationship between the film thickness and the cross-raz, and determined the optimal thermal conductivity for each layer. We discovered that there was a film thickness. Further, the composition of each layer for realizing the above thermal conductivity was determined. An experimental example will be described below.
- each thin film having the structure shown in Fig. 9 (lower protective layer 2: (lower protective layer 2: (1)) is placed on a 0.6 mm thick land / group recording polycarbonate substrate 1 provided at the top of the .
- An information recording member having a similar structure and having a diffusion layer 5 ′ was attached via an adhesive 6.
- the optical information recording medium with the above configuration Call it Isk15.
- the refractive index of the polycarbonate substrate was 1.58. (The appropriate thickness and composition range of each thin film constituting the optical disk 15 will be described later.)
- the track pitch is varied between 0.4 and 0.75 ⁇ m for each zone, so that the track pitch dependence of the cross laze can be measured. I am doing it.
- Information recording and reproduction were performed on the optical disk 15 (referred to as 10-1 for convenience in FIG. 10) by the information recording / reproducing apparatus shown in FIG. .
- the operation of the information recording / reproducing apparatus will be described below.
- As a motor control method for recording and playback the disk rotation speed is changed for each zone where recording and playback is performed, and a ZCLV (Zone Constant Linear Velocity) method is adopted.
- the disk linear velocity is about 8.3 m / s.
- Information from the outside of the recording device is transmitted to the 8-16 modulator using 8 bits as one unit.
- recording information on disk 1 recording was performed using a modulation method that converts 8 bits of information into 16 bits, a so-called 8-16 modulation method.
- this modulation method information of a mark length of 3T to 14T corresponding to 8-bit information is recorded on a medium.
- the 8-16 modulators 10-8 in the figure perform this modulation.
- T represents the clock cycle at the time of recording information, and here, it is set to 17.1 ns.
- the digital signal of 3 T to 14 T converted by the modulator 16 — 8 is transferred to the recording waveform generator circuit 10 — 6, and the pulse width of the high-power pulse is reduced by approximately ⁇ / 2, a low power level laser irradiation with a width of about ⁇ / 2 is performed between the high power level laser irradiation and A multi-pulse recording waveform is generated in which laser irradiation at an intermediate power level is performed between the series of high power pulses.
- the high power level for forming the recording mark is 11.0 mW
- the intermediate power level at which the recording mark can be erased is 4.0 mW
- the low power level is lower than the intermediate power level. 'The power level was 3.0 mW.
- the signals of 3T to 14T are made to correspond to “0” and “1” alternately in a time series, and if “0”, the level of the intermediate power level is changed.
- the laser beam is radiated, and in the case of “1”, a series of high power pulse trains including high power level pulses is radiated.
- the portion of the optical disk 1 irradiated with the intermediate power level laser beam becomes a crystal (space portion), and a series of high power pulse trains including high power level pulses is formed.
- the part irradiated with the laser beam changes to amorphous (marked part).
- the length of the space portion before and after the mark portion is within the recording waveform generating circuits 10-6. It has a multi-pulse waveform table that supports the method of changing the first pulse width and the last pulse width of the multi-pulse waveform (adaptive recording waveform control) in accordance with the pulse width.
- a multi-pulse recording waveform is generated that can minimize the effects of thermal interference between marks.
- the recording waveform generated by the recording waveform generation circuit 10-6 is transferred to the laser driving circuit 10-7, and the laser driving circuit 10-7 converts the recording waveform to light based on this recording waveform.
- the semiconductor laser in the head 10-3 is emitted.
- a semiconductor laser with a light wavelength of 6555 nm is used as an energy beam for information recording.
- this laser light is applied to the lens NA 0.6
- the information was recorded by narrowing down the recording layer of the optical disc 12 with an object lens and irradiating a laser beam having an energy corresponding to the recording waveform described above.
- the spot diameter of the laser beam is about 0.9 ⁇ E / ⁇ . Therefore, under the above conditions, the spot diameter of one laser beam is about 0.98 micron. At this time, the polarization of the laser beam was changed to circular polarization.
- this recording device is compatible with the method of recording information in both the group and the land (area between groups) (so-called land group recording method).
- tracking for the land and group can be arbitrarily selected by the L / G servo circuits 10-9.
- Reproduction of the recorded information was also performed using the optical heads 10-3.
- a reproduction signal is obtained by irradiating a laser beam onto the recorded mark and detecting reflected light from the mark and a portion other than the mark.
- the amplitude of the reproduced signal is increased by the preamplifier circuit 10-4 and transferred to the 8-16 demodulator 10-10.
- the 8-16 demodulator 10-10 converts the data into 8-bit information every 16 bits.
- the shortest mark, the 3 ⁇ mark has a mark length of about 0.42 m
- the longest mark, the 14 T mark has a mark length of about 1. 9 6 ⁇ m.
- the thickness of the thermal diffusion control layer is 15 nm
- An optical disk 16 having the same structure as the disk 15 was created, and the amount of jitter rise due to the cross-lease of the reproduced signal of the group was measured. The result is shown in FIG. At this time, the optical disk 16 required about 1.3 times as much recording power as the optical disk 15.
- the jitter at 0.7 ⁇ m of the track pitch of the optical disk 15 is 8.0% for the land, 8.2% for the group, and the jitter of the optical disk 16 for the track pitch is 0.7%. At 0.7 m in the pitch pitch, the jitter was 8.5% in the land and 8.7% in the group.
- the thickness of the thermal diffusion control layer is smaller than the groove depth for an optical disk 16, and the track pitch is 0.7 ⁇ m or less, jitter rise due to cross-lease will occur.
- the rise of the cross due to the cross lens is less than 0.55 / m. This occurred at the track pitch, and when the track pitch was 0.55 m or more, there was no increase in the zipper by the cross-rail. Therefore, it was clarified that the effect of the present invention was exhibited when the track pitch was between 0.55 m and 0.65 m.
- Track pitch 0.615 m information for both land and group Address information for recording information is provided at the beginning of each sector, and several types of lasers with a thickness of 0.6 mm and a groove depth varying between 50 and 80 nm are provided.
- Each thin film having the structure shown in FIG. 9 was sequentially formed on a substrate 1 made of polycarbonate for recording of head / group by a sputtering ring process. Further, an information recording member having a similar structure was bonded via an adhesive.
- the refractive index of the polycarbonate substrate was 1.58.
- the mark length of the shortest mark 3T mark is about 0.42 ⁇ m, and the mark length of the longest mark 14T mark is about 1.96 ⁇ m.
- Jitter increase due to crosstalk did not occur when the groove depth was between 59 nm and 67 nm, but when the groove depth was smaller than 59 nm or larger than 67 nm In some cases, cross-raise and cross-talk caused jitter rise. Thus, when the groove depth was 59 nm or more and 67 nm or less, it was clear that the effect of the present invention was exhibited.
- the effect of reducing crosstalk is determined by the relationship between the laser wavelength of a laser beam and the groove depth. If the laser wavelength of the laser beam is determined and the refractive index of the substrate at the wavelength is n, It is sufficient that the groove depth is not less than person / (7n) and not more than person / (6.2n).
- the thermal diffusion control layer in which the effects of the present invention are exhibited has a refractive index of 1.4 to 3.0 optically, and is a material that does not absorb light. It is desirable to contain carbides, nitrides, sulfides, and selenides. Further, a plurality of thermal diffusion control layers having different compositions may be combined. When Zn and S are contained in at least one of the thermal diffusion control layers, the effect of reducing cross-ray is particularly pronounced. But (ZnS) 8. (S i O 2.
- a heat diffusion control layer using a material having a different composition may be used. Further, layers of these mixed materials may be used. Further, as in the present embodiment, a thermal diffusion control layer composed of ZnS and an oxide and a layer of the other material described above may be stacked to form a multilayer thermal diffusion control layer. In this case, any of the oxides, nitrides, and fluorides is more preferable among the materials other than the above-mentioned material composed of ZnS and oxide.
- the recording sensitivity is not reduced, and This makes it possible to achieve a reduction in data loss, a high CNR, and an improvement in the durability against multiple rewrites.
- even when information is recorded in both the land and the group it can be obtained from the land and the group.
- An information recording medium that does not greatly differ in the quality of the reproduced signal to be reproduced is realized. More desirably, when the thickness of the thermal diffusion control layer is 100 nm or more and 150 nm or less, productivity is improved in addition to the above effects.
- the heat diffusion layer a metal or an alloy having high reflectivity and high thermal conductivity is preferable, and the total content of Al, Cu, Ag, Au, Pt, and Pd is 90%. % Is desirable.
- a thermal diffusion layer containing 95% or more of A1 it is possible to obtain an information recording medium which is inexpensive, has high CNR, high recording sensitivity, excellent durability against multiple rewrites, and has an extremely large cross laze reduction effect. This has come.
- the composition of the thermal diffusion layer contains 95% or more of A1
- an information recording medium having excellent corrosion resistance can be realized at low cost.
- Additive elements for A 1 include Co, Ti, Cr, Ni, Mg, Si, V, Ca, Fe, Zn, Zr, Nb, Mo, Rh, Sn, Sb, Te, Ta, W, Ir, Pb, B and C are excellent in terms of corrosion resistance, but the added elements are C0, Cr, Ti, Ni, F In the case of eCu, there is a great effect particularly on the improvement of corrosion resistance.
- the thickness of the thermal diffusion layer is preferably 30 nm or more and 300 nm or less. If the thickness of the heat diffusion layer is smaller than 30 nm, the heat generated in the recording layer becomes difficult to diffuse, so that the recording film is liable to be deteriorated, especially after rewriting about 100,000 times. In addition, a cross-lease may easily occur. In addition, since light is transmitted, it is difficult to use it as a reflection layer, and the reproduction signal amplitude may be reduced.
- the thickness of the heat diffusion layer is more than 300 nm, productivity is poor, and the substrate is warped due to internal stress of the heat diffusion layer, so that information can be recorded and reproduced accurately. May not be possible.
- the thickness of the heat diffusion layer is 70 nm or more and 150 nm or less, corrosion resistance and productivity are excellent, which is more desirable.
- phase-change recording layer whose main components are Ge, Sb, Te, In, Ag, etc. as optical discs.
- heat is generated by an energy beam, and the heat characteristics (reflectance, modulation degree) and thermal characteristics (temperature distribution, cooling rate distribution) of the optical disc on which recording marks are recorded are generated by this heat. Therefore, the present invention is not limited to a phase-change optical disk, but is applied to a magneto-optical recording layer mainly composed of Tb, Fe, Co, Dy, Gd, and the like. It is also effective in recording.
- the invention is not limited to rewritable information recording media.
- the change occurs only when a high-power laser beam is irradiated, and this change is irreversible.
- the basis of the present invention is that heat is generated by the energy beam, and the heat is used in addition to the optical characteristics (reflectance and modulation) of the optical disk for recording the recording mark. Since the characteristics (temperature distribution, cooling rate distribution) are controlled, it is particularly limited to rewritable optical disks. Instead, it can be applied to a write-once optical disk.
- Ri pay particular phase-change recording material is suitable, instead Ri of the recording film of A g 6 G ei 6 S b 22 T e 55 used in the above Examples It is a material, a g 5 G e 2. S b 20 T e 55, A i G e 2 i S b 23 T e, etc.Ag-G e-S b-T e system .
- the amount of Ag increases, the recording sensitivity improves, but the number of residuals increases. Also, when the amount of Ag is small, the erasing characteristics are improved, but the recording sensitivity is reduced.
- a g-G e-S b-T e system A g is 1 to 5 at%, G e is 17 to 23 at%, S b is 19 to 25 at%, and T e is 53 It has been found that compositions in the range of 559 at.% Do not particularly reduce the number of rewritable times. In addition, the composition in which Ag Sb Te 2 or a material close thereto is 20 % to 20% and Ge 2 Sb 2 Te 5 or a material close thereto is the balance of the crystalline state and the amorphous state It was found that the difference in reflectivity was large and the reproduction signal was large, which was preferable.
- such a recording film is a recording film to which a phase change component having Ge-Sb-Te as a main component and a high melting point component having a higher melting point are added.
- 95% or more of the total number of atoms of the phase change component is Ri Do Ri by a combination of a G e T e and S TD 2 T e 3
- the high melting point component is the total number of atoms of 95% or more on the C r - T e, C r-S b s C r — G e, C r-S b-T e, Cr-Sb-Ge, Cr-Ge-Te, Co-Te, Co-Sb, Co-Ge, Co-Sb-Te, Co-Sb -Ge, Co-Ge-Te, Cu-Te, Cu-Sb, Cu-Ge, Cu-Sb-Te, Cu-Sb-Ge, C u _ Ge-Te, Mn-Te
- the proportion of the high melting point component atoms in the total number of atoms of the recording film is 5 atomic% or more. , 20 at% or less has good rewriting characteristics. 5 atomic% or more and 15 atomic% or less have good erasing characteristics, so that rewriting characteristics are better.
- the reproduction signal output is slightly reduced, but has the advantage that the recording film flow during multiple rewriting is suppressed.
- the impurity element in the recording film that is, an element not described above, is 10 atomic% or less of the recording film component because the deterioration of the rewriting characteristics can be reduced little. More preferably, it is 5 atomic% or less.
- the effect of reducing cross-raz is large.
- a range of 5 nm or more and 20 nm or less is preferable because the degree of modulation is large and the flow is less likely to occur. If it is 15 nm or less, it is more preferable.
- the change in the atomic arrangement refers to a change in the atomic arrangement that hardly involves a change in the outer shape of the film such as a phase change.
- the thermal buffer layer preferably has a complex refractive index n, k in the range of 1.4 ⁇ n 4.5, -2.5 ⁇ k ⁇ -0.5, particularly 2 n ⁇ 3,-1.5 ⁇ Materials with k ⁇ -0.5 are desirable. Since the heat buffer layer absorbs light, a thermally stable material is preferred, and preferably has a melting point of 100 ° C. or more. In addition, when sulfide was added to the thermal diffusion control layer, a particularly large cross-lease reduction effect was obtained, but in the case of the thermal buffer layer, thermal diffusion control was performed even when the content of sulfide such as ZnS was small. It is desirable that the content of the above sulfide added to the layer be less. This is because adverse effects such as a decrease in melting point, a decrease in thermal conductivity, and a decrease in absorptivity may occur.
- the composition of the thermal buffer layer is desirably a mixture of a metal and a metal oxide, a metal sulfide, a metal nitride, or a metal carbide, and a mixture of Cr and Cr 203 is particularly preferable. A good effect of improving the overwrite characteristics was shown.
- the above metals include Al, Cu, Ag, Au, Pi: Pd, Co, Ti, Cr, Ni, Mg, Si, V, C a, Fes Zn, Zr, Nb, Mo, Rh, Sn, Sb, Te, Ta, W, Ir, Pb Mixtures are preferred, metal oxides, metals sulfides, metal nitrides, S i 0 2, S i ⁇ is a metal carbide, T i 02, a 1203, Y 20.3, C e ⁇ , L azOs.
- I nzOa G e 0, G e 02, P b 0, S n 0, S n 02, B i 203, T e 02, W 02, W 03, S c 203, T a 205, Z r 0 2 is preferred arbitrariness.
- S i-0- N-based materials S i - A l - 0- N based material, C r 2 03 C r- 0 based material, such as,, C o 2 ⁇ 3, C o O C, such as o— Oxide such as 0-based material, Si-N-based material such as TAN, A1N, Si3N4, and A1-Si-N-based material (for example, A1SiN2) , Ge-N based nitrides, ZnS, Sb2S3, Cds, In2S3, Ga2S3, GeS, SnS2, PbS , B i 2 S 3, etc., S n S e 3, S b 2 S 3, C d S e, Z n S e, In 2 S e 3, G a 2 S e 3, G e S e, G e S e 2 , S n S e, P b S e, Selector emission products, such as B i 2 S
- the thermal buffer layer has a property of absorbing light. Therefore, the thermal buffer layer absorbs light and generates heat, just like the recording layer absorbs light and generates heat. It is also important that the absorptivity in the thermal buffer layer be larger when the recording layer is in an amorphous state than when the recording layer is in a crystalline state. In this way, the optical design allows the absorption rate A a in the recording layer when the recording layer is in an amorphous state to be higher than the absorption rate A c in the recording layer when the recording layer is in a crystalline state. The effect of reducing the size appears. With this effect, the overwrite characteristics can be greatly improved.
- the thermal buffer layer In order to obtain the above characteristics, it is necessary to increase the absorptivity in the thermal buffer layer to about 30 to 40%. Further, the amount of heat generated in the thermal buffer layer differs depending on whether the recording layer is in a crystalline state or an amorphous state. As a result, the flow of heat from the recording layer to the heat spreading layer changes depending on the state of the recording layer, and this phenomenon suppresses an increase in jitter due to overwriting. I can do it.
- the above effects are exhibited by the effect of blocking the flow of heat from the recording layer to the thermal diffusion layer by increasing the temperature in the thermal buffer layer.
- the relationship between the thickness of the thermal diffusion control layer and the thickness of the thermal buffer layer is important.
- the inventors have conducted intensive studies and found that when the sum of the thicknesses of the thermal diffusion control layer is greater than the thickness of the thermal buffer layer, the track pitch can be narrowed without lowering the CNR and recording sensitivity.
- good overwrite characteristics can be realized even in high-density recording where the recording mark length is less than half the energy beam spot diameter. I did it.
- the shortest recording mark length is 40% or more of the energy beam spot diameter.
- the effect of the present invention was most remarkably exhibited.
- a phenomenon may occur in which the reflectance of the crystal is reduced when the rewriting is performed a large number of times, about 100,000 times. This is because when the recording layer was melted by a high power laser beam, the S element in the thermal diffusion control layer melted into the recording layer, and the refractive index of the recording layer changed. This is a phenomenon that occurs.
- Is a material of the interfacial layer S i 0 2, S i O, T i 02, A 1203, Y 203, C e O, L a 203, I n 203, G e O, G e 02, P bO, SnO, Sn02, Bi203, Te02, W02, W03, Sc203, Ta205, and Zr 2 are preferred.
- S i — 0—N material S i — Al — O—N material, Cr 2 O 3 , etc.
- oxides such as C o-0 based material, T a N, a 1 N , such as S i 3 N 4 S i - N -based material, a 1 - S i - N-based material (e.g., a 1 S i N 2 ), using nitrides such as G e- N-based materials, C e F 3, M g F 2, fluorides such as C a F 2, or the interfacial layer was used having a composition close to the above material Is also good. Further, a layer of these mixed materials may be used. In addition, when the interface layer is made of a mixed material of ZnS and the above oxide, nitride, or fluoride, it is excellent in that the recording sensitivity is improved.
- the thermal simulation was performed.
- the width of the land and glove is about 0.6 m each, and the mark width (the width of the fusion zone) is approximately
- the melting point of the recording film is about 600 ° C. Therefore, to achieve a mark width of 0.4 ⁇ m, it is necessary to heat a point 0.2 ⁇ m away from the track center 19 to 600 ° C. Also, in such a layout, the recording mark 17 of the adjacent information recording track is 0 to 0 from the track center 19 of the center track 18.
- the phenomenon in which the recording mark 17 of the adjacent information recording track is crystallized is a cross-lease.
- the condition that the cross-lease does not occur even after recording 100,000 times is that the recording mark 17 of the adjacent information recording drum when the center track 18 is irradiated with the laser beam 20 It is determined by a function of temperature and time at.
- the crystallization time of the Ge—Sb—Te phase change recording material used for high-density information recording media such as RAM is active between the amorphous state and the crystalline state. It is a function of temperature due to the presence of activation energy.
- the time required for a laser beam spot to pass through a point on the medium is about 100 ns under the 4.7 GBDVD-RAM condition (8.2 m / s).
- the crystallization temperature in this time period is estimated to be about 300 to 500 ° C.
- the integrated value of the irradiation time of the adjacent information recording track is about 10 seconds.
- the crystallization temperature when held for about 10 seconds is the temperature at which cross-lease occurs.
- the crystallization temperature at this time is about 200 ° C. Therefore, when the width of the part heated to 600 ° C or more is set to 0.4 m by thermal simulation, the recording mark 1 of the adjacent information recording track is used.
- the end of mark 7 crossing laze station 2 1
- crossing laze station 2 1 By calculating the time during which the temperature is maintained at 200 ° C or higher (cross-losing temperature holding time) from the temperature change, it is possible to determine whether or not cross-losing will occur. Wear.
- the thermal conductivity is achieved Ri by the dielectric film containing S elements such as (Z n S) so (S i 02) 2 Q, when the content of S element is less than 5% or more 50% Is equivalent to
- the relationship between the thickness of the thermal diffusion layer and the cross-laze temperature retention time at the adjacent information recording track observation point was calculated, and the results are shown in Fig. 15.
- the cross release temperature retention time is 100 nm or more, whereas the thickness of the thermal diffusion layer is 30 ns or more.
- the cross-lease temperature holding time is 10 ns or less.
- the thermal conductivity of the thermal diffusion layer should be set to 100 W / mK or more in order to reduce the time to 100 ns or less.
- Materials with high thermal conductivity are high-reflectivity metals such as Au, Al, Cu, Ag, Pd, and Pt, or high-hardness materials such as diamond.
- the metal when the content of the high-reflectance metal is set to 90% or more, the metal can be used as a heat diffusion layer having high reflectance and high thermal conductivity.
- the best is A1 or a metal obtained by adding a metal such as Ti or Cr to A1.
- a thermal diffusion layer containing 97% or more of A 1 is excellent in practicality.
- the information recording medium of the present invention even in high-density recording where the track pitch is 70% or less of the diameter of one laser beam spot, the CNR and the overshoot are reduced. It is possible to realize an information recording medium in which the write characteristics and the recording sensitivity are not reduced and the cross-lease does not occur.
- the CNR and the overwrite can be reduced. Narrow track pitch can be achieved without deteriorating characteristics and recording sensitivity, and a high-density information recording medium compatible with information recording / reproducing devices using inexpensive semiconductor lasers is realized. be able to.
- the CNR and the recording sensitivity can be improved. It is possible to achieve narrow track pitch without lowering the recording pitch, and it is particularly suitable for high-density recording where the recording mark length is less than half the energy beam spot diameter.
- the information recording medium of the present invention also reduces the track pitch. Even in high-density recording where the beam spot diameter is 70% or less of the beam spot diameter, narrow track pitch can be achieved without deteriorating CNR, overwrite characteristics, and recording sensitivity. In addition, it is possible to realize an information recording medium in which a reproduced signal does not deteriorate even after rewriting a large number of times of about 100,000 times.
- the CNR and the overwrite can be obtained.
- Narrow track pitch can be achieved without deteriorating characteristics and recording sensitivity, and there is a difference in recording sensitivity between recording information in the land and recording information in a group. It is possible to realize an information recording medium that does not need to be used.
- the present invention is useful as an information recording medium used for high-density recording such that a track pitch is 70% or less of a laser beam spot diameter.
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Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US09/807,116 US6636477B1 (en) | 1998-10-07 | 1999-10-04 | Information recording medium and information recording device |
US10/653,161 US6954941B2 (en) | 1998-10-07 | 2003-09-03 | Information recording medium and information recording device |
Applications Claiming Priority (2)
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JP10/285008 | 1998-10-07 | ||
JP28500898 | 1998-10-07 |
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US09/807,116 A-371-Of-International US6636477B1 (en) | 1998-10-07 | 1999-10-04 | Information recording medium and information recording device |
US10/653,161 Continuation US6954941B2 (en) | 1998-10-07 | 2003-09-03 | Information recording medium and information recording device |
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WO2000021081A1 true WO2000021081A1 (fr) | 2000-04-13 |
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PCT/JP1999/005444 WO2000021081A1 (fr) | 1998-10-07 | 1999-10-04 | Support d'enregistrement d'information et dispositif d'enregistrement d'information |
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US (2) | US6636477B1 (ja) |
KR (1) | KR100418011B1 (ja) |
CN (1) | CN1230815C (ja) |
WO (1) | WO2000021081A1 (ja) |
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JP2003151176A (ja) * | 2001-11-12 | 2003-05-23 | Matsushita Electric Ind Co Ltd | 光学情報記録媒体 |
US7001655B2 (en) | 2002-10-02 | 2006-02-21 | Mitsubishi Chemical Corporation | Optical recording medium |
WO2005015551A3 (en) * | 2003-08-12 | 2005-06-02 | Koninkl Philips Electronics Nv | A recorder, a disc and a method for recording information on a disc |
Also Published As
Publication number | Publication date |
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US6954941B2 (en) | 2005-10-11 |
KR20010080039A (ko) | 2001-08-22 |
KR100418011B1 (ko) | 2004-02-11 |
US6636477B1 (en) | 2003-10-21 |
CN1230815C (zh) | 2005-12-07 |
CN1326585A (zh) | 2001-12-12 |
US20040042381A1 (en) | 2004-03-04 |
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