EP1023724A1 - Optisches speichermedium - Google Patents
Optisches speichermediumInfo
- 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- Withdrawn
Links
Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—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
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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
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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
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- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—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
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- 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
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- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—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
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- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—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
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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
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- 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
- G11B7/2472—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
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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
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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
- G11B7/2475—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
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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
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- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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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
- G11B7/248—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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- 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
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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
- G11B7/2533—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]
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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
- G11B7/2533—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
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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
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- 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]
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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
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- 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
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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
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- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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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
Beschreibbares, optisches Speichermedium, umfassend eine Schutzschicht, eine oder mehrere einschreibbare Schichten, gegebenenfalls eine lichtreflektierende Schicht und mindestens eine Trägerschicht, wobei die Trägerschicht mindestens einen Farbstoff enthält, der bei der zum Beschreiben und/oder Ablesen verwendeten Wellenlänge des Lasers eine Transmission von mindestens 70 % aufweist und bei allen anderen Wellenlängen des sichtbaren Lichts, die mindestens 100 nm kürzer als die Wellenlänge des Laserlichts sind, eine Absorption von mindestens 70 % aufweist.
Description
Optisches Speichermedium
Die Erfindung betrifft ein beschreibbares, optisches Speichermedium, insbesondere in Form einer ein- oder mehrfach beschreibbaren Compact Disk (CD) mit einer spezifischen Trägerschicht.
Übliche beschreibbare, optische Speichermedien, insbesondere CD-Rs, bei denen die Datenaufzeichnung und Ablesung mit Hilfe von Laserlicht erfolgt, sind aufgebaut aus einem transparenten Träger, einer Aufzeichnungsschicht aus einem Metall wie z.B. Te, Bi oder Mn oder einem Farbstoff wie z.B. einem Cyanin-, Merocyanin-, Phthalocyanin-, oder Azo-Farbstoff, einer metallischen Reflexionsschicht sowie gegebenenfalls einer Schutzschicht. Die Datenaufzeichnung erfolgt durch Bestrahlen mit Laserlicht durch den transparenten Träger. Dadurch wird die Aufzeichnungschicht an den bestrahlten Punkten deformiert, sublimiert, verdampft oder modifiziert, so daß sich gegebenenfalls Vertiefungen bilden. Häufig bildet sich auch ein freier Raum zwischen der Aufzeichnungsschicht und der benachbarten Schicht. Auf der beschreibbaren Schicht ist üblicherweise eine reflektierende Metallschicht aus Au, Ag, AI oder Cu und wiederum darauf eine Schutzschicht aufgebracht. Die Ablesung erfolgt durch Bestrahlen mit einem Laserlicht geringerer Energie ebenfalls durch den transparenten Träger. Der Kontrast zwischen dem von den Vertiefungen reflektierten Licht und dem von den übrigen Partien des Speichermediums reflektierten Licht wird als elektrisches Signal abgelesen.
Übliche nicht beschreibbare CDs (ROM-Typ, read-only-memory) weisen keine, vorstehend aufgeführte beschreibbare Schicht auf, sondern nur den wiederzugebenden Daten entsprechende Vertiefungen, die bereits auf dem Träger ausgebildet sind, z.B. durch Pressformen. Davon abgesehen ist der Aufbau relativ ähnlich.
Für eine genauere Erläuterung s. A. B. Marchant, Optical Recording (1990).
Ein Problem bei bekannten CD-Rs stellt die relativ hohe Empfindlichkeit der Aufzeichnungsschicht dar. Wärmeeinwirkung und Einwirkung von Strahlung können dazu führen, daß sich die Aufzeichnungsschicht verändert und die CD-Rs nicht mehr beschreibbar und/oder nicht mehr lesbar sind. So geben einige Hersteller die
Empfehlung, CD-Rs nicht dem direkten Sonnenlicht auszusetzen. Gerätehersteller raten, CD-Rs nicht in DVD-Spielern abzuspielen, da befürchtet wird, daß die kürzere Wellenlänge des im DVD-Spieler verwendeten Lasers die CD-Rs schädigen könnte. Die gespeicherten Informationen sind dann nur noch fehlerhaft ablesbar, was mit Hilfe von elektronischen Testgeräten gemessen werden und u. a. als Block-Erro'r-Rate angegeben wird.
Die Block-Error-Rate gibt summarisch die Gesamtzahl fehlerhafter Informationsblöcke an und soll möglichst klein sein. Überschreitet die Block-Error-Rate den Wert 220, ist der Datenträger nicht spezifikationsgerecht. Die Block-Error-Rate wird mit einem CD- Testspieler ermittelt. Für nähere Angaben s. W. Schild "Fehler vom Player, Fehler von der Platte", aus Funkschau 23/1988. Es ist auch möglich, daß die CD-R so stark verändert sind, daß sie überhaupt nicht mehr gelesen oder beschrieben werden können.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, beschreibbare optische Speichermedien und insbesondere beschreibbare CDs bereitzustellen, die eine verbesserte Stabilität und damit Lebensdauer besitzen.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein beschreibbares optisches Speichermedium zur Verfügung gestellt wird, das eine Schutzschicht, eine oder mehrere beschreibbare Schichten, gegebenenfalls eine lichtreflektierende Schicht und mindestens eine Trägerschicht umfaßt, und das dadurch gekennzeichnet ist, daß die Trägerschicht mindestens einen Farbstoff enthält, so daß sie bei der zum Beschreiben und/oder Ablesen verwendeten Wellenlänge des Lasers eine Transmission von mindestens 70 % aufweist und bei allen anderen Wellenlängen des sichtbaren Lichts, die mindestens 100 nm kürzer sind als die Wellenlänge des Laserlichts eine Absorption von mindestens 70 % aufweist. Bevorzugt enthält die Trägerschicht mindestens zwei Farbstoffe, besonders bevorzugt drei Farbstoffe, um die gewünschte Absorptionscharakteristik zu erhalten.
Bevorzugt wird der/die Farbstoffe ausgewählt aus der Gruppe der Anthrachinon- und Pyrazolonfarbstoffe. Besonders bevorzugt sind Makrolexgelb 3G® (Pyrazolonfarbstoff, Colour Index, Teil 1 : Solvent Yellow 93), Makrolexrot 5B® (Anthrachinonfarbstoff,
Colour Index, Teil 1, Solvent Red 52, Teil 2 Nr. 68210) und Hytherm Blue E® (Anthrachinonfarbstoff, Colour Index Teil 1 Solvent Blue 101).
Das Material für die Trägerschicht ist nicht kritisch, es gibt keine spezifischen Einschränkungen. Die Trägerschicht besteht aus üblicherweise für optische Speichermedien und insbesondere CD-Rs verwendetem Material, insbesondere aus dem für das zum Beschreiben und/oder Ablesen verwendete Laserlicht transparenten Polymeren, wie Poly(co)carbonaten, Polymethylmethacrylaten, Poly-4-methylpenten-l, amorphe cyclische Polyolefine, Polyester, Epoxiharzen, Polyacrylaten, insbesondere wird Poly(co)carbonat verwendet. Sie kann Informationssignale in Form von Vertiefungen und/oder Kontrollsignale und/oder Führungsrillen aufweisen, d.h. sie kann ein gegebenenfalls formatierter Träger mit oder ohne Informationssignale sein. Gegebenenfalls kann sie auf übliche Weise oberflächenbehandelt sein.
Der/die Farbstoffe werden auf übliche Art und Weise in das Trägermaterial eingearbeitet, z.B. durch Compoundieren der Farbstoffe mit oder durch Aufbringen der Farbstoffe auf das Trägermaterial-Granulat. Vorzugsweise kann die Farbstoffzugabe auch als Masterbatch erfolgen.
Die Konzentration des/der Farbstoffe im Trägermaterial beträgt bevorzugt 0,1 bis 1,4 Gew-%, vorzugsweise 0,3 - 0,8 Gew-%. Der Träger wird aus dem farbstoffhaltigen Material auf übliche Weise. geformt, z.B. durch Spritzguß oder Prägen.
Falls mehrere Trägerschichten vorgesehen werden, so bestehen sie bevorzugt aus demselben Polymer-Material. Der/die Farbstoffe können in diesem Fall in einer einzigen oder in mehreren Trägerschichten eingearbeitet sein.
Die gegebenenfalls vorgesehene(n) beschreibbare(n) Schicht(en) ist/sind bevorzugt die üblichen, sensitiven Farbstoffschicht(en) (vgl. z. B. EP-A 353 392, 488 231 und 410 879). Sie bestehen aus einem oder mehreren organischen Farbstoffen wie Phthalocyaninen, Merocyaninen, Cyaninen, Indodicarbocyaninen, Azulenen und Azo- Farbstoffen. Diese werden z.B. als Lösung in einem Lösungsmittel in üblicher Weise wie z.B. durch spin-coating aufgetragen. Als Lösemittel werden beispielsweise
Diacetonalkohol, fluorierte Alkohole wie z. B. Tetrafluorpropanol, Butanol oder auch Gemiche daraus verwandt.
Die Farbstoffe der einschreibbaren Schicht(en) sind von den Farbstoffen der Trägerschicht verschieden. Besonders bevorzugt sind Cyaninfarbstoffe. Die gegebenenfalls vorgesehene reflektierende Schicht besteht bevorzugt aus einem Metall mit einer Reflexion von mehr als 80% bei der verwendeten Laserlichtwellenlänge wie z.B. Au, Ag, AI, Cu oder einer Legierung daraus. Sie kann z.B. durch Ablagerung aus der Gasphase wie Vakuumablagerung, Sputtering, ion- plating oder ähnliche Techniken aufgebracht werden. Die Schutzschicht besteht aus einem Harz mit hervorragender Schlagfestigkeit, üblicherweise einem Epoxiharz, Polyacrylatharz, oder Silikon-Hartharz. Die Schutzschicht wird üblicherweise durch Auftragen des Harzes durch Spin-Coating gefolgt von UV-Bestrahlung zum Härten gebildet. Sie kann aber auch aus einem weichen Material wie beispielsweise einem Polyurethanharz bestehen.
Die Schichtdicken der einzelnen Schichten betragen bevorzugt 0,5 - 1,2 mm (Träger), bis zu 200 nm (beschreibbare Schicht), bis 200 nm (reflektierende Schicht) und 5 - 200 μm (Schutzschicht).
Die Wellenlänge des Lasers zum Beschreiben und/oder Ablesen beträgt bevorzugt 760- 800 nm, besonders bevorzugt 775-785 nm bzw. 620-660 nm, besonders bevorzugt 635- 650 nm.
Die folgenden Beispiele verdeutlichen die Erfindung weiter.
Die relative Viskosität des Polycarbonats wird mit Hilfe einer 0,5 % Lösung des Polycarbonats in Methylenchlorid bei 25°C gemessen.
Beispiele:
Erfindungsgemäßes Beispiel:
Als Trägermaterial wird folgende Mischung hergestellt:
99,6224 Gew. % Polycarbonatgranulat, Makrolon CD 2005 der Bayer AG, ein Polycarbonat aus Bisphenol-A mit tert.-Butylphenol-Endgruppen einer mittleren Lösungsviskosität von 1.20 (gemessen in
Methylenchlorid bei 25°C und einer Konzentration von 0,5g in
100ml Methylenchlorid) 0,06513 Gew.-% Pyrazolonfarbstoff Macrolexgelb 3G (geführt im Colour Index, Teil 1 , als Solvent Yellow 93), Bayer AG
0, 19746 Gew.-% Anthrachinonfarbstoff Macrolexrot 5B (geführt im Colour Index,
Teil 1, als Solvent Red 52), Bayer AG 0, 11501 Gew.-% Anthrachinonfarbstoff Hythermblue E (geführt im Colour Index als Solvent Blue 101),
Die Farbstoffe werden mit dem Granulat in einem geschlossenen Gefäß intensiv durchmischt und die Mischung danach auf einem Zwei-Schnecken-Kneter des Typs Werner Pfleiderer ZSK 53 bei einer Massetemperatur von ca. 240°C compoundiert.
Anschließend werden auf einer CD-Spritzgießmaschine mit CD-R-Stamper CD-R- Rohlinge hergestellt, die eine Dicke von 1,2 mm und einen Außendurchmesser von 120 mm aufweisen. Die CD-R-Herstellung erfolgt dabei bei einer Massetemperatur von 330°C, einer Werkzeugtemperatur von 100°C und einer Zykluszeit von 10 sec. Der CD- R-Stamper weist ein spiralförmig angeordnetes Pregroove mit einer mittleren Breite von 75 nm, einer mittleren Tiefe von 180 nm mit einem Spurabstand von 1,6 μm auf
An den CD-R-Rohlingen wird die Transmission gemessen. Fig. 1 zeigt, daß das Material bei Wellenlängen unterhalb von 700 nm eine hohe Absorption aufweist (Meßgeometrie: 0°/diffus).
Vergleichsbeispiel
Zum Vergleich werden analoge CD-R-Rohlinge hergestellt, wobei allerdings dem Substratmaterial Makrolon CD 2005 keine Farbstoffe zugesetzt werden. Fig. 2 zeigt, daß das Material im gesamten Bereich des sichtbaren Lichtes hohe Transmission aufweist (Meßgeometrie: 0°/diffus).
Anschließend wird auf den CD-R-Rohlingen eine Farbstoffschicht aufgebracht. Als Farbstoff wird der Cyaninfarbstoff OM57 von Fuji in Verbindung mit dem Quencher Kayasorb IRG-022 von NipponKayaku Co. verwandt. Das Verhältnis von Farbstoff zu Quencher beträgt 20:1. Der Farbstoff/Quencherauftrag erfolgte aus Diacetonalkohol- lösung mittels Spincoating, wobei die Bedingungen so gewählt werden, daß eine mittlere Farbstoffschichtdicke von 150 nm resultiert.
Anschließend wird auf die Farbschicht eine 60 bis 80 nm dicke Goldschicht aufgedampft, welche wiederum mit einem ca. 10 μm dicken Schutzlack versehen wird.
Die erhaltenen CD-Rs, die erfindungsgemäßen bzw. die aus dem Vergleichsversuch, werden anschließend in einem Yamaha CD-R 100 Brenner mit 4-facher Schreib- /Lesegeschwindigkeit beschrieben. Anschließend wird die Block-Error-Rate (BLER) der CD-Rs mithilfe eines ISEDD-Testspielers des Ingenieurbüros für Umwelttechnologie und Meßtechnik, Bielefeld, in dem ein Philips- und ein Sony-Player integriert sind, gemessen.
Die Qualität der CD-Rs liegt auf vergleichbarem Niveau, wie nachfolgende Tabelle zeigt:
Tabelle 1
erfindungsgemäße CD-R 60 59
CD-R ohne Farbstoff im
Substratmaterial 62 64
Die erfindungsgemäßen CD-Rs sowie die Vergleich-CD-Rs werden anschließend einem Belichtungstest nach ISO 4892-2 unterzogen. Die Belichtung erfolgte durch das Substratmaterial hindurch auf die CD-R-Farbstoffschicht unter folgenden Testbedingungen:
Gerät: Atlas Xenon- WOM Leuchtquelle: XENON-Lampe 6.5KW (v. Atlas)
Bestrahlungsstärke: 0,35W/(m2*nm), gemessen bei 340nm
Filterung: Pyrex / Pyrex
Schwarzstandardtemperatur: 65°C
Probenraumtemperatur: 42°C Rel. Luftfeuchte: 65%
Beregnungszyklus : 102/ 18min
Danach werden wiederum die Block-Error-Raten mit dem ISEED-Testspieler gemessen.
Die Vergleichs-CD-R zeigt bereits nach ca. 10 Stunden Belichtungsdauer eine signifikante Zunahme im BLER. Nach ca. 20h Belichtungsdauer lag die BLER auf einem Wert von ca. 500, d. h. weit außerhalb der Spezifikation.
Die erfindungsgemäße CD-R zeigt bis praktisch 50 Stunden Belichtungsdauer keine Zunahme im BLER.
Claims
1. Beschreibbares, optisches Speichermedium, umfassend eine Schutzschicht, eine oder mehrere einschreibbare Schichten, gegebenenfalls eine lichtreflektierende Schicht und mindestens eine Trägerschicht, dadurch gekennzeichnet, daß die
Trägerschicht mindestens einen Farbstoff enthält, und bei der zum Beschreiben und/oder Ablesen verwendeten Wellenlänge des Lasers eine Transmission von mindestens 70 % aufweist und bei allen anderen Wellenlängen des sichtbaren Lichts, die mindestens 100 nm kürzer sind als die Wellenlänge des Laserlichts eine Absorption von mindestens 70 % aufweist.
2. Optisches Speichermedium nach Anspruch 1, dadurch gekennzeichnet, daß die Trägerschicht mindestens zwei Farbstoffe enthält.
3. Optisches Speichermedium nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Transmission mindestens 80 %, vorzugsweise 85 % und die Absorption mindestens 90 %, vorzugsweise 95 % beträgt.
4. Optisches Speichermedium nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Wellenlänge des Lasers zum Beschreiben und/oder zum
Ablesen 760-800 nm, vorzugsweise 775-785 nm beträgt.
5. Optisches Speichermedium nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Wellenlänge des Lasers zum Beschreiben und/oder zum Ablesen 620-660 nm, vorzugsweise 635-650 nm beträgt.
6. Optisches Speichermedium nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der oder die Farbstoffe ausgewählt werden aus der Gruppe der Anthrachinon- oder Pyrazolonfarbstoffe.
7. Optisches Speichermedium nach einem der Ansprüche 1 bis 6, dadurch
gekennzeichnet, daß der oder die Farbstoffe ausgewählt werden aus Makrolexgelb 3G®, Makrolexrot 5B® oder Hytherm Blue E®.
8. Optisches Speichermedium nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Trägerschicht 0,1-1 Gew.% Farbstoff enthält.
9. Optisches Speichermedium nach einem der Ansprüche 1 bis 8 in Form einer ein- oder mehrfach beschreibbaren Compact Disk.
10. Optisches Speichermedium nach Anspruch 9, dadurch gekennzeichnet, daß die beschreibbare Schicht aus einem sensitiven Farbstoff besteht, der von dem oder den Farbstoffen unterschiedlich ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19744162A DE19744162A1 (de) | 1997-10-07 | 1997-10-07 | Optisches Speichermedium |
DE19744162 | 1997-10-07 | ||
PCT/EP1998/006100 WO1999018571A1 (de) | 1997-10-07 | 1998-09-24 | Optisches speichermedium |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1023724A1 true EP1023724A1 (de) | 2000-08-02 |
Family
ID=7844777
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98952645A Withdrawn EP1023724A1 (de) | 1997-10-07 | 1998-09-24 | Optisches speichermedium |
Country Status (12)
Country | Link |
---|---|
EP (1) | EP1023724A1 (de) |
JP (1) | JP2001519581A (de) |
KR (1) | KR20010024430A (de) |
CN (1) | CN1273666A (de) |
AU (1) | AU1026699A (de) |
BR (1) | BR9812868A (de) |
CA (1) | CA2305147A1 (de) |
DE (1) | DE19744162A1 (de) |
IL (1) | IL134872A0 (de) |
NO (1) | NO20001746D0 (de) |
TW (1) | TW464855B (de) |
WO (1) | WO1999018571A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2001016950A1 (en) * | 1999-08-27 | 2001-03-08 | The Dow Chemical Company | High data density optical media discs |
US6944115B2 (en) | 2000-09-29 | 2005-09-13 | General Electric Company | Colored data storage media |
US20030112737A1 (en) * | 2001-06-05 | 2003-06-19 | Thompson Robert F. | 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 (de) * | 2007-11-15 | 2009-05-27 | Deutsche Thomson OHG | Verschiebungs-unempfindliche Speicherung von Informationen auf seitenorientierten optischen Datenspeichersystemen |
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)
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 |
-
1997
- 1997-10-07 DE DE19744162A patent/DE19744162A1/de not_active Withdrawn
-
1998
- 1998-09-24 WO PCT/EP1998/006100 patent/WO1999018571A1/de not_active Application Discontinuation
- 1998-09-24 JP JP2000515272A patent/JP2001519581A/ja active Pending
- 1998-09-24 KR KR1020007003682A patent/KR20010024430A/ko not_active Application Discontinuation
- 1998-09-24 EP EP98952645A patent/EP1023724A1/de not_active Withdrawn
- 1998-09-24 BR BR9812868-0A patent/BR9812868A/pt not_active IP Right Cessation
- 1998-09-24 AU AU10266/99A patent/AU1026699A/en not_active Abandoned
- 1998-09-24 CN CN98809900A patent/CN1273666A/zh active Pending
- 1998-09-24 IL IL13487298A patent/IL134872A0/xx unknown
- 1998-09-24 CA CA002305147A patent/CA2305147A1/en not_active Abandoned
- 1998-09-25 TW TW087115932A patent/TW464855B/zh not_active IP Right Cessation
-
2000
- 2000-04-05 NO NO20001746A patent/NO20001746D0/no unknown
Non-Patent Citations (1)
Title |
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See references of WO9918571A1 * |
Also Published As
Publication number | Publication date |
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TW464855B (en) | 2001-11-21 |
KR20010024430A (ko) | 2001-03-26 |
CA2305147A1 (en) | 1999-04-15 |
BR9812868A (pt) | 2000-08-08 |
NO20001746L (no) | 2000-04-05 |
NO20001746D0 (no) | 2000-04-05 |
DE19744162A1 (de) | 1999-04-08 |
WO1999018571A1 (de) | 1999-04-15 |
AU1026699A (en) | 1999-04-27 |
CN1273666A (zh) | 2000-11-15 |
JP2001519581A (ja) | 2001-10-23 |
IL134872A0 (en) | 2001-05-20 |
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