EP1023724A1 - Memoire optique - Google Patents

Memoire optique

Info

Publication number
EP1023724A1
EP1023724A1 EP98952645A EP98952645A EP1023724A1 EP 1023724 A1 EP1023724 A1 EP 1023724A1 EP 98952645 A EP98952645 A EP 98952645A EP 98952645 A EP98952645 A EP 98952645A EP 1023724 A1 EP1023724 A1 EP 1023724A1
Authority
EP
European Patent Office
Prior art keywords
storage medium
optical storage
dye
medium according
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98952645A
Other languages
German (de)
English (en)
Inventor
Reiner Vesper
Hartmut LÖWER
Raimund Zimmermann
Wilfried Haese
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP1023724A1 publication Critical patent/EP1023724A1/fr
Withdrawn legal-status Critical Current

Links

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
    • G11B7/252—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
    • 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
    • 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
    • G11B2007/24618—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 two or more dyes in two or more different layers, e.g. one dye absorbing at 405 nm in layer one and a different dye absorbing at 650 nm in layer two
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2545—CDs
    • 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
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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
    • G11B7/244—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
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    • 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
    • G11B7/2472—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 cyanine
    • G—PHYSICS
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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
    • G11B7/244—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
    • G11B7/2475—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 merocyanine
    • 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
    • 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
    • G11B7/253—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
    • G11B7/2535—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 polyesters, e.g. PET, PETG or PEN
    • 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
    • G11B7/2538—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 polycycloolefins [PCO]
    • 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
    • G11B7/254—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 protective topcoat layers
    • G11B7/2542—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 protective topcoat layers consisting essentially of organic 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
    • G11B7/258—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
    • 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
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    • G11B7/2585—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 aluminium
    • 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
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    • 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
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • G11B7/2595—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 gold

Definitions

  • the invention relates to a writable, optical storage medium, in particular in the form of a single or multiple writable compact disk (CD) with a specific carrier layer.
  • a writable, optical storage medium in particular in the form of a single or multiple writable compact disk (CD) with a specific carrier layer.
  • Conventional writable optical storage media in particular CD-Rs, in which the data is recorded and read using laser light, are made up of a transparent support, a recording layer made of a metal such as e.g. Te, Bi or Mn or a dye such as e.g. a cyanine, merocyanine, phthalocyanine or azo dye, a metallic reflection layer and optionally a protective layer.
  • the data is recorded by irradiating laser light through the transparent support.
  • the recording layer is deformed, sublimed, evaporated or modified at the irradiated points, so that depressions are formed if necessary.
  • a free space is often also formed between the recording layer and the adjacent layer.
  • a reflective metal layer made of Au, Ag, Al or Cu and, in turn, a protective layer are usually applied to the writable layer.
  • the reading is carried out by irradiation with a laser light of lower energy, also through the transparent support.
  • the contrast between the light reflected by the depressions and the light reflected by the other parts of the storage medium is read as an electrical signal.
  • Usual non-writable CDs do not have any of the writable layers listed above, but only depressions corresponding to the data to be played back, which are already formed on the carrier, e.g. through press molding. Apart from that, the structure is relatively similar.
  • CD-Rs A problem with known CD-Rs is the relatively high sensitivity of the recording layer. Exposure to heat and radiation can lead to the recording layer changing and the CD-Rs being no longer writable and / or no longer readable. So some manufacturers give that Recommendation not to expose CD-Rs to direct sunlight. Device manufacturers advise not to play CD-Rs in DVD players, as it is feared that the shorter wavelength of the laser used in the DVD player could damage the CD-Rs. The stored information can then only be read incorrectly, which are measured with the aid of electronic test equipment and 'r-rate is specified as a block Erro among others.
  • the block error rate summarizes the total number of incorrect information blocks and should be as small as possible. If the block error rate exceeds 220, the data carrier does not meet specifications.
  • the block error rate is determined with a CD test player. For more information see W. Schild "Errors from the player, errors from the record", from Funkschau 23/1988. It is also possible that the CD-Rs have been changed so much that they can no longer be read or written to.
  • the present invention has for its object to provide writable optical storage media and in particular writable CDs, which have improved stability and thus durability.
  • a writable optical storage medium which comprises a protective layer, one or more writable layers, optionally a light-reflecting layer and at least one carrier layer, and which is characterized in that the carrier layer contains at least one dye so that it has a transmission of at least 70% for the wavelength of the laser used for writing and / or reading and for all other wavelengths of visible light which are at least 100 nm shorter than the wavelength of the laser light has an absorption of at least 70% .
  • the carrier layer preferably contains at least two dyes, particularly preferably three dyes, in order to obtain the desired absorption characteristic.
  • the dye (s) is preferably selected from the group of the anthraquinone and pyrazolone dyes.
  • Makrolexgelb 3G® pyrazolone dye, Color Index, Part 1: Solvent Yellow 93
  • Makrolexrot 5B® anthraquinone dye, Color Index, Part 1, Solvent Red 52, Part 2 No. 68210
  • Hytherm Blue E® anthraquinone dye, Color Index Part 1 Solvent Blue 101
  • the material for the backing layer is not critical, there are no specific restrictions.
  • the carrier layer consists of material usually used for optical storage media and in particular CD-Rs, in particular of the polymers transparent for the laser light used for writing and / or reading, such as poly (co) carbonates, polymethyl methacrylates, poly-4-methylpentene-1, amorphous cyclic polyolefins, polyesters, epoxy resins, polyacrylates, in particular poly (co) carbonate is used. It can have information signals in the form of depressions and / or control signals and / or guide grooves, i.e. it can be an optionally formatted carrier with or without information signals. If necessary, it can be surface-treated in the usual way.
  • the dye (s) are incorporated in the carrier material in the usual way, e.g. by compounding the dyes with or by applying the dyes to the carrier material granules.
  • the dye can preferably also be added as a masterbatch.
  • the concentration of the dye (s) in the carrier material is preferably 0.1 to 1.4% by weight, preferably 0.3-0.8% by weight.
  • the carrier is made from the dye-containing material in the usual way. shaped, e.g. by injection molding or embossing.
  • carrier layers they preferably consist of the same polymer material.
  • the dye (s) can be incorporated in a single or in several carrier layers.
  • the writable layer (s) that may be provided is / are preferably the customary, sensitive dye layer (s) (cf., for example, EP-A 353 392, 488 231 and 410 879). They consist of one or more organic dyes such as phthalocyanines, merocyanines, cyanines, indodicarbocyanines, azulenes and azo dyes. These are applied, for example, as a solution in a solvent in the customary manner, for example by spin coating. As a solvent, for example Diacetone alcohol, fluorinated alcohols such as. B. tetrafluoropropanol, butanol or mixtures thereof.
  • a solvent for example Diacetone alcohol, fluorinated alcohols such as. B. tetrafluoropropanol, butanol or mixtures thereof.
  • the dyes of the writable layer (s) are different from the dyes of the backing layer. Cyanine dyes are particularly preferred.
  • the reflective layer optionally provided preferably consists of a metal with a reflection of more than 80% at the laser light wavelength used, e.g. Au, Ag, AI, Cu or an alloy thereof. It can e.g. by deposition from the gas phase such as vacuum deposition, sputtering, ion-plating or similar techniques.
  • the protective layer consists of a resin with excellent impact resistance, usually an epoxy resin, polyacrylate resin, or silicone hard resin. The protective layer is usually formed by applying the resin by spin coating followed by UV radiation for curing. But it can also consist of a soft material such as a polyurethane resin.
  • the layer thicknesses of the individual layers are preferably 0.5-1.2 mm (carrier), up to 200 nm (writable layer), up to 200 nm (reflective layer) and 5-200 ⁇ m (protective layer).
  • the wavelength of the laser for writing and / or reading is preferably 760-800 nm, particularly preferably 775-785 nm or 620-660 nm, particularly preferably 635-650 nm.
  • the relative viscosity of the polycarbonate is measured using a 0.5% solution of the polycarbonate in methylene chloride at 25 ° C. Examples:
  • polycarbonate granulate 99.6224% by weight polycarbonate granulate, Makrolon CD 2005 from Bayer AG, a polycarbonate from bisphenol-A with tert-butylphenol end groups with an average solution viscosity of 1.20 (measured in
  • the dyes are thoroughly mixed with the granules in a closed vessel and the mixture is then compounded on a Werner Pfleiderer ZSK 53 twin-screw kneader at a melt temperature of approx. 240 ° C.
  • CD-R blanks are produced on a CD injection molding machine with CD-R stamper, which have a thickness of 1.2 mm and an outer diameter of 120 mm.
  • the CD-R production takes place at a melt temperature of 330 ° C, a mold temperature of 100 ° C and a cycle time of 10 seconds.
  • the CD-R stamper has a spirally arranged pre-groove with an average width of 75 nm, an average Depth of 180 nm with a track spacing of 1.6 ⁇ m
  • Fig. 1 shows that the material has a high absorption at wavelengths below 700 nm (measurement geometry: 0 ° / diffuse). Comparative example
  • Analog CD-R blanks are produced for comparison, although no dyes are added to the substrate material Makrolon CD 2005.
  • Fig. 2 shows that the material has high transmission in the entire range of visible light (measurement geometry: 0 ° / diffuse).
  • a layer of dye is then applied to the CD-R blanks.
  • the cyanine dye OM57 from Fuji is used as the dye in conjunction with the Quencher Kayasorb IRG-022 from NipponKayaku Co.
  • the ratio of dye to quencher is 20: 1.
  • the dye / quencher was applied from diacetone alcohol solution by means of spin coating, the conditions being chosen so that an average dye layer thickness of 150 nm results.
  • the CD-Rs obtained, those according to the invention or those from the comparative test, are subsequently written in a Hyundai CD-R 100 burner with 4 times the write / read speed.
  • the block error rate (BLER) of the CD-Rs is then measured using an ISEDD test player from the engineering office for environmental technology and measurement technology, Bielefeld, in which a Philips and a Sony player are integrated.
  • CD-R 60 59 according to the invention
  • the CD-Rs according to the invention and the comparison CD-Rs are then subjected to an exposure test in accordance with ISO 4892-2.
  • the exposure was carried out through the substrate material onto the CD-R dye layer under the following test conditions:
  • Atlas Xenon- WOM light source XENON lamp 6.5KW (from Atlas)
  • the comparison CD-R shows a significant increase in BLER after only about 10 hours of exposure. After about 20 hours of exposure, the BLER was at a value of about 500, i.e. H. far out of specification.
  • the CD-R according to the invention shows no increase in BLER up to practically 50 hours of exposure.

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

L'invention concerne une mémoire optique inscriptible, comprenant une couche de protection, au moins une couche inscriptible, éventuellement une couche réfléchissante et au moins une couche support. La couche support comprend au moins un colorant qui présente une transmission d'au moins 70 % à la longueur d'onde du laser, utilisée pour l'écriture et/ou la lecture, et qui présente une absorption d'au moins 70 % à toutes les autres longueurs d'onde de la lumière visible inférieures d'au moins 100 nm à la longueur d'onde de la lumière laser.
EP98952645A 1997-10-07 1998-09-24 Memoire optique Withdrawn EP1023724A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19744162 1997-10-07
DE19744162A DE19744162A1 (de) 1997-10-07 1997-10-07 Optisches Speichermedium
PCT/EP1998/006100 WO1999018571A1 (fr) 1997-10-07 1998-09-24 Memoire optique

Publications (1)

Publication Number Publication Date
EP1023724A1 true EP1023724A1 (fr) 2000-08-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98952645A Withdrawn EP1023724A1 (fr) 1997-10-07 1998-09-24 Memoire optique

Country Status (12)

Country Link
EP (1) EP1023724A1 (fr)
JP (1) JP2001519581A (fr)
KR (1) KR20010024430A (fr)
CN (1) CN1273666A (fr)
AU (1) AU1026699A (fr)
BR (1) BR9812868A (fr)
CA (1) CA2305147A1 (fr)
DE (1) DE19744162A1 (fr)
IL (1) IL134872A0 (fr)
NO (1) NO20001746D0 (fr)
TW (1) TW464855B (fr)
WO (1) WO1999018571A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU6508600A (en) * 1999-08-27 2001-03-26 Dow Chemical Company, The High data density optical media discs
US6944115B2 (en) 2000-09-29 2005-09-13 General Electric Company Colored data storage media
US7177261B2 (en) * 2001-06-05 2007-02-13 Flexplay Technologies, Inc. Limited play optical devices with interstitial reactive layer and methods of making same
DE10151847A1 (de) 2001-10-24 2003-05-08 Bayer Ag Laserabsorbierende russarme Formmassen
EP2063423A1 (fr) * 2007-11-15 2009-05-27 Deutsche Thomson OHG Stockage d'informations insensible au déplacement dans des systèmes de stockage de données optiques orientées sur page
US8343608B2 (en) * 2010-08-31 2013-01-01 General Electric Company Use of appended dyes in optical data storage media
CN112002782B (zh) * 2020-08-28 2022-03-01 河南师范大学 一种基于MnBi2Te4单层的纳米尺度光电传感器

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6439647A (en) * 1987-08-05 1989-02-09 Sanyo Electric Co Optical recording disk
JPH0341640A (ja) * 1989-07-10 1991-02-22 Sanyo Electric Co Ltd 光記録媒体
JPH0461640A (ja) * 1990-06-27 1992-02-27 Victor Co Of Japan Ltd 追記型光ディスク
JP3020745B2 (ja) * 1992-08-06 2000-03-15 帝人化成株式会社 光学的記録材料及び光学的記録基板
US5648197A (en) * 1995-01-31 1997-07-15 Victor Company Of Japan, Ltd. Optical disk
JPH0954980A (ja) * 1995-08-08 1997-02-25 Mitsui Toatsu Chem Inc 光記録媒体

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9918571A1 *

Also Published As

Publication number Publication date
DE19744162A1 (de) 1999-04-08
IL134872A0 (en) 2001-05-20
AU1026699A (en) 1999-04-27
CA2305147A1 (fr) 1999-04-15
CN1273666A (zh) 2000-11-15
KR20010024430A (ko) 2001-03-26
BR9812868A (pt) 2000-08-08
JP2001519581A (ja) 2001-10-23
TW464855B (en) 2001-11-21
NO20001746L (no) 2000-04-05
NO20001746D0 (no) 2000-04-05
WO1999018571A1 (fr) 1999-04-15

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