Classifications

• • 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
  • G11B7/242—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
  • G11B7/2433—Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
• • 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
  • G11B7/2403—Layers; Shape, structure or physical properties thereof
  • G11B7/24035—Recording layers
  • G11B7/24038—Multiple laminated recording layers
• • 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
• • 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
  • G11B7/242—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
  • G11B7/244—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 organic materials only
  • G11B7/246—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 organic materials only containing dyes
• • 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
  • G11B7/242—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)
• • 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
  • G11B7/242—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)
• • 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
  • G11B7/242—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)
• • 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
  • G11B7/242—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)
• • 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
  • G11B7/242—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)
• • 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
  • G11B7/242—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
  • G11B2007/24318—Non-metallic elements
  • G11B2007/2432—Oxygen
• • 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
  • G11B7/242—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
  • G11B2007/24318—Non-metallic elements
  • G11B2007/24322—Nitrogen
• • 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
  • 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)
• • 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
  • 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)
• • 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
  • 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)
• • 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
  • 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
• • 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
  • 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
  • G11B7/242—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
  • G11B7/244—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 organic materials only
  • G11B7/246—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 organic materials only containing dyes
  • G11B7/2463—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 organic materials only containing dyes azulene
• • 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
  • G11B7/242—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
  • G11B7/244—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 organic materials only
  • G11B7/246—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 organic materials only containing dyes
  • G11B7/2467—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 organic materials only containing dyes azo-dyes
• • 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
  • G11B7/242—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
  • G11B7/244—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 organic materials only
  • G11B7/246—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 organic materials only containing dyes
  • G11B7/247—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 organic materials only containing dyes methine or polymethine dyes
• • 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
  • G11B7/242—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
  • G11B7/244—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 organic materials only
  • G11B7/246—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 organic materials only containing dyes
  • G11B7/248—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 organic materials only containing dyes porphines; azaporphines, e.g. phthalocyanines
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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
  • G11B7/242—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
  • G11B7/244—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 organic materials only
  • G11B7/249—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 organic materials only containing organometallic compounds
  • G11B7/2492—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 organic materials only containing organometallic compounds neutral compounds
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  • G11—INFORMATION STORAGE
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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
  • G11B7/253—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
  • G11B7/2531—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 glass
• • 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
• • 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]
• • 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
  • G11B7/2572—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 organic materials
  • G11B7/2575—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 organic materials resins
• • 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
• • 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
  • G11B7/258—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 reflective layers
  • G11B7/259—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 reflective layers based on silver

Definitions

• CDs compact discs
• DVDs digital versatile discs
• the recording of binary signals and the detection of tracking signals are performed by utilizing the change in reflectivity caused by the interference of light from the bottom of the concave pit and the mirror surface.
• CD-R write-once compact discs
• CD-RW phase-change rewritable compact discs
• various types of rewritable DVDs and DVDs that can be added to DVDs have been proposed.
• Conventional optical recording media having an organic dye thin film as a recording layer include those using a phthalocyanine compound, a cyanine dye, or a phenalene dye or a naphthoquinone dye in the organic dye thin film. Has been.
• a write-once compact disc (CD-R) optical recording medium in which an organic dye, a metal reflective layer, and a UV resin protective layer are sequentially laminated on a substrate, requires a high reflectance to satisfy the CD standard, and therefore has a reproduction wavelength range. It was necessary to develop an organic dye having a high refractive index (770 to 830 nm) and high stability (DVD-R, which is a write-once DVD, has a reproduction wavelength of 630 to 680 nm).
• Patent Documents 5 and 6 also describe single-sided, dual-layer write-once optical discs. However, these technologies also optimized the optical characteristics of each layer and performed good recording / reproducing with stable tracking. No issues were considered and there was no mention of push-pull.
• rewritable CDs and DVDs of the phase change type detect a recorded information signal by utilizing a change in a reflectance and a change in a phase difference caused by a difference in a refractive index between an amorphous state and a crystalline state.
• An ordinary phase-change optical recording medium has a structure in which a lower protective layer, a phase-change recording layer, an upper protective layer, and a reflective layer are provided on a substrate (these are collectively referred to as an information layer).
• Patent Document 5 Japanese Patent Application Laid-Open No. 2000-082238
• Figure 9 is a diagram showing the relationship between PP i / PP 2 and jitter of the phase-change optical recording medium of single-sided two-layer type.
• the push-pull is larger than the above range, it is difficult to focus each layer stably due to a decrease in reflectance. If the push-pull is smaller than the above range, the tracking becomes unstable or the transmittance of the first information layer decreases.
• the DPD signal is preferably 0.3 or more in both the write-once type and the phase change type.
• a DPD method (Differential Phase Detection: phase difference detection method) is adopted. Therefore, if the DPD signal is smaller than 0.3, tracking in a read-only optical disc device becomes unstable, and tracking is likely to be lost. There is a tendency.
• a first information layer 100 is formed on a first substrate 101 having a guide groove.
• the first information layer 100 may be a single layer of the first recording layer 103, or may have a configuration in which the first reflective layer 105 is laminated on the first recording layer.
• a transparent first heat diffusion layer 106 may be provided on the first reflection layer.
• an undercoat layer or a protective layer (not shown) may be provided between the first recording layer 103 and the first substrate 101, and these may be laminated to improve the function. Good.
• the second information layer 200 is formed on a second substrate 201 having a guide groove.
• the second information layer 200 may be a single layer of the second recording layer 203, or may have a configuration in which the second reflective layer 205 and the second recording layer 203 are stacked. Further, an undercoat layer or a protective layer (not shown) may be provided between the second recording layer 203 and the intermediate layer 300, and may be laminated to improve the function.
• a guide groove may be formed in the intermediate layer 300, and the second information layer 200 may be formed thereon.
• a transparent resin such as polycarbonate, acrylic resin, or polyolefin, or transparent glass can be used. Above all, polycarbonate resin is the most preferred material because it has a track record of being used most widely in CDs and is inexpensive.
• the first substrate may be provided with a groove having a pitch for guiding recording / reproducing light as needed.
• the thickness of the first substrate is preferably about 0.6 mm ⁇ 0.1 mm.
• the same material as that of the first substrate may be used, but a material that is opaque to recording / reproducing light may be used. good.
• the thickness of the second substrate is not particularly limited, but it is preferable to select the thickness of the second substrate so that the total thickness with the first substrate is 1.2 mm. Further, a guide groove may be provided on the side on which the second information layer is formed.
• Items necessary for forming the recording layer of the optical recording medium include optical characteristics.
• the conditions required as the optical characteristics are that the recording / reproducing wavelength has a large absorption band on the short wavelength side and the recording / reproducing wavelength is near the long wavelength end of the absorption band. This means that it has a large refractive index and extinction coefficient at the recording / reproducing wavelength.
• the refractive index n of the recording layer at the recording / reproducing wavelength is 1.5 ⁇ n3.0
• the extinction coefficient k is in the range of 0.02 ⁇ k ⁇ 0.2. Is preferred. If this condition is satisfied, stable recording and playback with high sensitivity and high modulation will be possible.
• ⁇ is less than 1.5, it is difficult to obtain a sufficient optical change, so that the recording modulation degree becomes low, which is not preferable. If ⁇ exceeds 3.0, the wavelength dependence becomes too high, so that the recording / reproducing wavelength region However, it is not preferable because an error occurs. If k is less than 0.02, the recording sensitivity deteriorates, which is not preferable.If k is more than 0.2, it is difficult to obtain a reflectance of 18% or more, especially in the first information layer. It is not preferable because the transmittance becomes too low and the recording sensitivity of the second information layer deteriorates.
• the azo compound forming cuts on both sides of the azo bond are substituted / unsubstituted aromatic rings, pyridine residues, pyrimidine residues, pyrazine residues, pyrazine residues,
• a metal chelate compound of an azo compound composed of a combination of a triazine residue, an imidazole residue, a triazole residue, a virazole residue, a thiazole residue, an isothiazole residue, a benzothiazole residue and the like is particularly preferable.
• Z is a residue that forms a heterocyclic ring together with the carbon atom and the nitrogen atom to which it is bonded, and specifically, a pyridazine ring, a pyrimidine ring, a pyrazine ring, or a triazine ring
• these heterocycles may have a substituent such as an alkyl group, an alkoxy group, an alkylthio group, a substituted amino group, an aryl group, an aryloxy group, an anilino group, a keto group, etc.
• dipyrromethene metal chelate dye a chelate compound of a dipyrromethene compound represented by the following general formula and a divalent metal atom is preferable.
• 1 ⁇ to 19 each independently represent a hydrogen atom, a halogen atom, a substituted / unsubstituted alkyl group, an a / recoxy group, an anorecenyl group, an ash / re group, an azorecoxy carboxy group. Represents an aryl group, an aralkyl group, an aryl group, or a heteroaryl group.
• Examples of the metal forming a chelate compound with the azo compound, formazan compound, dipyrromethene compound include Ni, Co, Cu, Mn, V, Zn, Fe, Cr, A1, and the like. From the viewpoint of manufacturing and disc characteristics, Ni, Co, Cu, Mn, and V are particularly preferable.
• any dye having an absorption band at 530 to 600 nm can be used, and among them, trimethine cyanine dye is preferable.
• the counter anion includes halogen-one, C 1 O ⁇ BF 4 —, PF 6 —, SbF 6 — and other metal chelates represented by nickel dithiolate complexes. It may be on.
• the squarium dyes include substituted and unsubstituted indrenines, benzindolenins, pyrazonoles, canolebazolones, quinoxalines, isolysines at both ends of the squalene ring. Those comprising a combination of an indole, an aromatic ring, and a substituted amino group residue are preferred.
• azanulene dyes examples include phthalocyanine, naphthalocyanine, tetravirazinovorphyrazine, tetrapyridinoporphyrazine, tetraazaporphyrin, etc. each having a specific substituent. Among them, tetraazaporphyrin is particularly preferred. Then, tetrapyridinovorphyrazine, tetrapyrazinoporphyrazine, and phthalocyanine are preferred in that order.
• the above-mentioned dye may be used by mixing or laminating it with another organic dye, a metal or a metal compound for the purpose of improving optical characteristics, recording sensitivity, signal characteristics and the like.
• organic dyes examples include (poly) methine dyes, naphthalocyanine, phthalocyanine, squarylium, croconium, pyrylium, naphthoquinone, anthraquinone (indancethrene), xanthene, and triphenylene
• organic dyes include non-methane-based, azulene-based, tetrahydrocholine-based, phenanthrene-based, triphenothiazine-based dyes, and metal complex compounds.
• various materials such as ionomer resins, polyamide resins, bur resins, natural polymers, silicones, liquid rubbers, or silane coupling agents may be dispersed and mixed in the dye.
• a stabilizer eg, a transition metal complex
• a dispersant e.g, a flame retardant, a lubricant, an antistatic agent, a surfactant, a plasticizer, and the like may be used together.
• Ki de also be used such as S i 0, S i 0 2 , polymethyl Atari rate resin as an organic material, a polycarbonate resin, E Po carboxymethyl resins, polystyrene resins, polyester resins, Bulle resins, cellulose resins Thermo-softening and heat-melting resins such as aliphatic hydrocarbon resins, natural rubber, styrene butadiene resin, chloroprene rubber, wax, alkyd resin, drying oil and rosin can also be used. Most preferred among the above materials are inorganic materials, such as Z n S, S i 0 2 .
• FIG. 2 is a schematic cross-sectional view of a single-sided, two-layer type phase-change optical recording medium according to another embodiment of the present invention.
• the recording / reproducing optical recording medium shown in FIG. 2 has two information layers. Each information layer is formed using a material whose optical characteristics change between amorphous and crystalline (a so-called phase change recording material). As in the case of FIG. 1, information is recorded on each information layer by irradiating a laser beam from the first substrate and recording a pattern called a mark. More specifically, a first information layer 100 is formed on a first substrate 101 having a guide groove.
• the thickness of the second recording layer is preferably in the range of 3 to 100 nm. If the thickness is less than 3 nm, the same problem as in the first recording layer occurs. If it exceeds 100 nm, it will be difficult to obtain optical contrast, and cracks will easily occur.
• the irradiation effect of such a high-energy noble gas is referred to as the "atomic peening (atomic cpe eining) effect".
• Ar is mixed into the sputtered film by an atomic piezing effect.
• the atomic peening effect can be estimated from the amount of Ar in the mixed film. That is, if the amount of Ar is small, it means that the high-energy Ar irradiation effect is small, and a film having a low density is easily formed.
• the amount of Ar is large, the irradiation of high energy Ar is intense and the density becomes high, but the Ar taken into the film repeatedly becomes a void (Void) during overwriting (O / W).
• the first recording layer is sandwiched between the first upper protective layer and the first lower protective layer
• the second recording layer is sandwiched between the second upper protective layer and the second lower protective layer 2.
• the first and second lower protective layers are effective mainly for preventing deformation of the first and second recording layers due to high temperature during recording. In addition, it has a function of preventing mutual diffusion between the recording layer and the reflective layer, suppressing the deformation of the first and second recording layers, and efficiently releasing heat to the first and second reflective layers.
• phase change recording material By using the phase change recording material as described above, low jitter can be realized in high density recording with the shortest mark length of 0.5 ⁇ m or less.According to the study of the present inventors, high density recording is realized. Therefore, when using a short-wavelength laser diode (for example, a wavelength of 700 nm or less), it is necessary to pay more attention to the layer structure of the quenching structure. In particular, when examining the one-beam overwrite characteristics using a small focused light beam with a wavelength of 500 nm or less and a numerical aperture NA of 0.55 or more, it is possible to flatten the temperature distribution in the mark width direction. It has been found that it is important to obtain a high erase ratio and a wide erase power margin.
• the erasing ratio and the erasing power margin can be improved by forming the reflective layer formed thereon on a material having a particularly high thermal conductivity.
• the present inventors have designed the layer configuration of the optical recording medium appropriately and made the temperature distribution in the cross-track direction in the medium flat so that the medium can be recrystallized without melting and re-amorphization. We tried to widen the range that can be erased and widen the erasing rate and erasing power margin. On the other hand, by promoting heat radiation from the recording layer to the reflective layer with extremely high thermal conductivity through the very thin upper protective layer with low thermal conductivity, the temperature distribution in the recording layer becomes flat. Was. Even if the thermal conductivity of the upper protective layer is increased, the heat radiation effect is promoted. However, if the heat radiation is promoted too much, the irradiation power required for recording is increased, and the recording sensitivity is significantly reduced.
• a thin upper protective layer having low thermal conductivity In the range from several nsec to several 10 nsec at the start of recording power irradiation, heat transfer from the recording layer to the reflective layer can be delayed in time, and then heat radiation to the reflective layer can be promoted. As a result, the recording sensitivity is not unnecessarily reduced.
• S i 0 2, T a 2 ⁇ 5, A 1 2 0 3, A 1 N, protective layer material and principal component of S i N and the like high its own thermal conductivity It is not suitable for the first and second upper protective layers by itself.
• heat dissipation in the reflective layer can be achieved, for example, in the case of the second information layer by increasing the thickness of the second reflective layer, but if the thickness of the second reflective layer exceeds 300 nm, the second The heat conduction in the film thickness direction becomes more remarkable than in the film surface direction of the recording layer, and the effect of improving the temperature distribution in the film surface direction cannot be obtained.
• the heat capacity of the second reflective layer itself increases, so that it takes time to cool the second reflective layer, and eventually the second recording layer, thereby preventing the formation of amorphous marks.
• a thin second reflective layer having high thermal conductivity is provided to selectively promote heat radiation in the lateral direction.
• the quenching structure used conventionally focuses only on one-dimensional heat dissipation in the film thickness direction, and is intended only to quickly release heat from the second recording layer to the second reflective layer. Inadequate attention was paid to the flattening of the temperature distribution.
• Low thermal conductivity upper protective layer materials with favorable results include ZnS, Z n 0, T a S 2 , at least one 50 to 90 mol% saw including a of the rare earth sulfide, and a melting point or decomposition point is a composite dielectric comprising a refractory compound of more than 1000 ° C.
• it is a composite dielectric containing 60 to 90 mol% of rare earth sulfides such as La, Ce, Nd, and Y, or 70 to 90 mol% of ZnS and ZnO.
• the heat-resistant compound materials having a temperature of 1000 ° C or higher include Mg, Ca, Sr, Y, La, Ce, Ho, Er, Yb, Ti, Zr, Hf, V, N Examples include oxides, nitrides, and carbides such as b, Ta, Zn, A1, Si, Ge, and Pb, and fluorides such as Ca, Mg, and Li.
• the thickness of the first and second upper protective layers is 5 to 30 nm as described above. Preferably it is less than 25 nm. If it is thicker than 30 nm, a sufficient flattening effect of the temperature distribution in the mark width direction cannot be obtained. If it is less than 5 nm, the effect of delaying heat conduction in the upper protective layer is insufficient, and the recording sensitivity is significantly reduced, which is not preferable.
• the thickness of the first and second upper protective layers is preferably 15 to 25 nm when the wavelength of the recording laser beam is 600 to 700 nm, 5 to ⁇ 0 nm when the recording laser beam is 350 to 600 nm, and 5 to 15 nm. More preferred.
• the first information layer requires a high transmittance, it is preferable to use Ag or an Ag alloy having a low refractive index and a high thermal conductivity for the first reflective layer.
• the thickness is preferably about 3 to 2 O nm. If the thickness is less than 3 nm, it is difficult to form a uniform and dense film. If the thickness is greater than 2 O nm, the transmittance will decrease, and it will be difficult to read / write the second information layer 200.
• the film may float due to the energy of the laser beam during the initialization process
• spin coat a UV resin or the like on the first and second information layers before the initialization May be applied and cured to form an overcoat. Further, after the next adhesion step is performed first, the first and second information layers may be initialized from the first substrate side.
• This method includes a first film forming step, an intermediate layer forming step, a second film forming step, a substrate bonding step, and an initializing step, and each step is basically performed in this order.
• groups are formed on the first substrate and the intermediate layer.
• the groove width and groove depth of the first and second substrates in each example and comparative example are values obtained using the intensity of interference light of a HeNe laser.
• the groove width is a half value width of the groove.

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• Chemical & Material Sciences (AREA)
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• Optical Record Carriers And Manufacture Thereof (AREA)
• Optical Recording Or Reproduction (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)

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• 2004
  • 2004-02-04 JP JP2004028603A patent/JP2005004944A/ja active Pending
  • 2004-04-26 EP EP04729515A patent/EP1626396A4/en not_active Withdrawn
  • 2004-04-26 WO PCT/JP2004/005979 patent/WO2004102544A1/ja not_active Ceased
  • 2004-04-30 TW TW093112115A patent/TW200426818A/zh not_active IP Right Cessation
• 2005
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