WO1999059142A2 - Organic dye-in-polymer (dip) medium for write-once-read-many (worm) optical discs with fluorescent reading - Google Patents
Organic dye-in-polymer (dip) medium for write-once-read-many (worm) optical discs with fluorescent reading Download PDFInfo
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- WO1999059142A2 WO1999059142A2 PCT/IB1999/001266 IB9901266W WO9959142A2 WO 1999059142 A2 WO1999059142 A2 WO 1999059142A2 IB 9901266 W IB9901266 W IB 9901266W WO 9959142 A2 WO9959142 A2 WO 9959142A2
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- recording
- fluorescent dye
- recording layer
- layer
- fluorescent
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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
- G11B7/242—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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- 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
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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
- G11B7/242—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
- G11B7/245—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 a polymeric component
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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
- G11B7/242—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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- 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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- 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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
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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
- G11B7/242—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
- G11B2007/24624—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 fluorescent dyes
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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
- 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
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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
- 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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- 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]
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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
- 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
Definitions
- This invention is in the field of media for WORM optical discs with fluorescent reading, providing high capacity optical memory, including 3-dimensional optical memory systems.
- All WORM optical media of practical interest is based on photothermal principle of recording.
- the data on such media is recorded by scanning the recording layer with the focused laser beam.
- the laser power is absorbed by the active medium of the layer and transformed into thermal energy, causing its physical and chemical changes, which can be optically registered at reading.
- Photochemical effects can also be used, i.e. optically detected changes in the state of medium, caused by direct interaction of photons with this medium.
- the efforts are made to use photosensitive medium for photochemical recording on WORM discs.
- the reason can be the non-threshold nature of photochemical recording on the contrary to photothermal recording at the same laser for recording and reading (with different laser power). Therefore, the photochemical recording can not provide the necessary stability of medium characteristics at multiple reading.
- phase change which does not provide geometric changing of the active layer, otherwise changing its optical constants, that causes optical contrast, which is usually not high for these materials.
- WORM optical discs with thin (10-100 nm) layers of organic dyes with or without dye-in-polymer are of special interest. Layers of organic dyes provide a range of sufficient advantages in comparison to metal or half-metal layers, used in WORM discs with ablative recording. Advantages are the following:
- Dyes may have a stronger selective absorption on the recording laser wavelength.
- Dye layers are more sensitive to the laser radiation because of their small thermal conductivity and low temperature of melting or decomposition. It provides a higher recording capacity.
- Dye layers provide a higher stability at higher humidity.
- the existing WORM optical discs based on organic dyes has a capacity up to 3.5 GB.
- This optical memory capacity is the utmost at least for the diode laser with 780-830 nm wavelength.
- Fluorescent reading offers a range of sufficient advantages in comparison to reading, based on changing the reflection ratio, even in single-layer systems.
- One of the advantages is the reduced tolerance for the sizes of recorded pits in comparison to the existing WORM discs. I.e., changing the size on a 100 nm does not influence the reading from fluorescent disc, while it totally eliminates the signal from reflective discs.
- Another advantage is the reduced sensitivity of fluorescent discs to changing the slope up to 1 grad that is absolutely intolerable for reflective discs.
- the basic advantage of fluorescent reading is the enhanced capacity of three-dimensional optical memory carriers, realized as multilayer discs.
- the local heating of the medium at recording can reach 700°C.
- Increase of the dye layer thickness up to 200 nm and more using polymer dye at preserving the surface concentration of dye leads to lowering the local heating temperature and allows to prevent the layer deformation. It also provides the appearance and growth of the dye fluorescence due to lowering the concentration suppression effect.
- the layer sensitivity to laser radiation is dramatically lowering, that leads to drop of recording speed and density.
- the purpose of this Invention is the obtaining of a high-sensitive organic dye-in-polymer (DIP) medium for write-once-read-many (WORM) optical discs with fluorescent reading, providing high speed and density of photothermal recording.
- DIP high-sensitive organic dye-in-polymer
- WORM write-once-read-many
- the other purpose of the present Invention is the obtaining of a DIP environment with high sensitivity to the recording laser radiation in visual and infra-red range.
- the future purpose of the present Invention is the obtaining of a DIP environment for single- and multilayer mediums with high optical memory capacity and high signal-to- noise ratio.
- the above-stated DIP environment contains a fluorescent dye, capable to absorb the recording laser radiation and to transform the absorbed light power into heat, and a choice of substances, capable to generate free radicals at their decomposition under heating, received from the laser radiation absorption by the fluorescent dye.
- the above-stated DIP environment contains a fluorescent dye and a non- fluorescent dye, capable to absorb the recording laser radiation and to transform the absorbed light power into heat, and a choice of substances, capable to generate free radicals at their decomposition under heating, received from the laser radiation absorption by the non- fluorescent dye.
- the above-mentioned free radicals cause the discoloring or change of absorption spectrum range of the fluorescent and/or non- fluorescent dyes, thus making the recording.
- the layer is fluorescent before recording. After recording is made, the irradiated spots lose fluorescence, while the background remains fluorescent. If the discoloring or change of color of only the non-fluorescent dye makes the recording, than its abso ⁇ tion spectrum range shall overlap the abso ⁇ tion and/or fluorescence spectrum of the fluorescent dye. In this case, the layer is not fluorescent before recording. After recording is made, the irradiated spots become fluorescent, while the background is not fluorescent.
- the substrate - a transparent disc from glass, polymethylmethacrylate, polycarbonate or polyethylene terephthalate - is covered with a recording layer, consisting of at least a fluorescent dye, capable to absorb the recording laser radiation, a compound, capable to generate free radicals during decomposition under heating, received from the laser radiation abso ⁇ tion by the fluorescent dye, and a film-forming polymer with high transparency, low heat conductivity and capable to provide the necessary quantum output of the dye fluorescence.
- a fluorescent dye capable to absorb the recording laser radiation
- a compound capable to generate free radicals during decomposition under heating, received from the laser radiation abso ⁇ tion by the fluorescent dye
- a film-forming polymer with high transparency, low heat conductivity and capable to provide the necessary quantum output of the dye fluorescence.
- the recording layer can contain compounds, quickening or suppressing photothermal decoloration of the dye, plastifiers, surface-active substances, organic reducers, preventing free radicals oxygen deactivation, etc.
- the thickness of recording layer can be 100-1000 nm, preferably - 200-500 nm.
- Fluorescent dye with abso ⁇ tion maximum near the recording laser wavelength is chosen among the xanthene dyes of the eosin and rhodamine groups, acridine, Oxazine, azine, perylene, violanthrone, cyanine, phthelocyanine dyes, indigoide colors and po ⁇ hyries.
- the content of fluorescent dye in the layer is equal to 0,1-10%.
- the choice of compound, capable to generate free radicals during decomposition under heating, received from the laser radiation abso ⁇ tion by the fluorescent dye, shall consider the relevant temperatures and rate of its decomposition.
- the possible compounds, capable to generate free radicals are azo and diazo compounds such as azo- bisisobutyronitrile, p-bromobenzene diazohydroxide, triphenylmethylazibenzene and diazobenzoyl, nitrosoacetanilide and its derivatives; peroxides such as benzyl peroxide and its derivatives, tert-dibutyl peroxide, etc.
- the content of compound, capable to generate free radicals, in the recording layer is equal to 0,1-20%.
- the film-forming polymer can be selected from a wide range of resins, such as: cellulose esters, i.e. nitrocellulose, cellulose acetate, cellulose acetate butyrate; cellulose ethers, i.e. methyl cellulose, ethyl cellulose, butyl cellulose; vinyl resins, i.e. polyvinyl acetate, polyvinyl butyral, polyvinyl acetyl, polyvinyl alcohol and polyvinyl pyrrolidon; acrylic resins, i.e. polymethylmetacrylate, polybutyl acrylate, polymethacylic acid, polyacryl amid polyacrylonitrile.
- resins such as: cellulose esters, i.e. nitrocellulose, cellulose acetate, cellulose acetate butyrate; cellulose ethers, i.e. methyl cellulose, ethyl cellulose, butyl cellulose; vinyl resins, i.e. polyvinyl acetate, poly
- Film-forming properties of the used resins and the plasticity of the recording layer can be improved by adding to resins the proper plastifier, such as dibutyl phthalate, dioctyl phthalate or tricresyl phosphate.
- the proper plastifier such as dibutyl phthalate, dioctyl phthalate or tricresyl phosphate.
- Zinc, lead, or cadmium salts of the higher aliphatic acids and also urea and etanolamine can be used for lowering decomposition temperature of compounds, generating free radicals, and therefore quickening the decoloring process.
- Hydroquinone, aliphatic and heterocyclic amines, sulfur containing compounds such as thiols, sulfides, disulfides isothiocyanates can be used to slow down decomposition of the compounds, generating free radicals.
- Reducing amines can also be added to prevent free radicals oxygen deactivation. They can be n-butylamine, dimethylaminoethyl methacrylate, diethyl-n-butylphosphine, and isoamyl 4-dimethylaminobensoate.
- the above-mentioned ingredients are dissolved in organic solvent or introduced in it as microcapsules less than 0,2 mkm in size, prepared by known methods, with future covering the substrate with this compound by spin coating, roller coating or dip coating.
- the organic solvent is usually selected from alcohols, ketones, amides, sulfoxides, ethers, esters, halogenated aliphatic hydrocarbons or aromatic solvents.
- solvents include methanol, ethanol, iso-propanol, iso-butanol, tetrafluoro-ethanol, diacetone alcohol, methyl cellosolve, ethyl cellosolve, acetone, methylethylketone, cyclohexanone, N,N-dimethhyl-formamide, N,N-dimethylacetamide, dimethylsulfoxide, tetra-hydrofurane, dioxane, ethyl acetate, chloroform, methylene chloride, dichloroethane, toluene, xylene or their mixtures.
- the recording layer also contains a non-fluorescent dye with an abso ⁇ tion spectrum range just slightly overlapping the abso ⁇ tion and fluorescence spectrum range of the fluorescent dye and with the maximum abso ⁇ tion value being close to the recording laser wavelength.
- the layer is fluorescent in its initial state before recording. During recording the non- fluorescent dye absorbs the laser radiation and transforms the absorbed light power into heat, influencing the generation of free radicals, causing decoloration of the fluorescent dye.
- the non-fluorescent dye can also lose color, what does not effect the use features of the medium.) After recording the irradiated spots has no fluorescence, while the background remains fluorescent.
- the advantage of this variant in comparison to the previous one is that the non-fluorescent dye is more effective in transforming light power to heat, than the fluorescent one, hence in this case we are to use lasers with different wavelength for recording and reading.
- the recording layer also contains a non- fluorescent dye with an abso ⁇ tion spectrum range covering the abso ⁇ tion and/or fluorescence spectrum range of the fluorescent dye.
- Concentration of the fluorescent dye shall provide a non- fluorescent layer before recording. Absence of fluorescence in the case, when abso ⁇ tion spectrum range of the non-fluorescent dye overlaps the abso ⁇ tion spectrum range of the fluorescent dye is caused by the fact that abso ⁇ tion optical density of the 1 st dye is much higher than the 2 nd one.
- the fluorescent and non-fluorescent dyes absorb laser radiation and transform the absorbed light power into heat, which influences the generation of free radicals, causing decoloration of the non-fluorescent dye.
- the irradiated spots become fluorescent. It allows to use the same laser (but with different pulse power) for recording and reading.
- the single recording layer of the optical disc is either directly deposited on the substrate, or there is also an intermediate layer between the substrate and the recording layer, that improves adhesion and mechanical solidity and lowers heat losses, preventing heat distribution into the substrate.
- use of intermediate layer can allow adding into the recording layer the solvents, being aggressive to the substrate.
- the recording layer can consist of two polymer sub-layers, one containing dyes, and the other containing the compound, generating free radicals, with the latter positioned above or below the sub-layer with dyes.
- the recording layer can be covered with a protective layer or another substrate can be bonded on it to protect the recording layer against the external environment and to improve its safety.
- the present Invention proposes consecutive bonding of the described above single-layer discs one to another so that the active recording layers would alternate the inactive separating layers of substrate.
- the glues shall be used, providing good adhesion of the bonded surfaces and absence of contraction, not influencing negatively the properties of recording layers, not lowering signal-to-noise ratio, transparent for the laser wavelength and fluorescent light.
- examples of such glues include UV-hardened optical glues of 3-92, UV-71, UV-69, UV-74, J-91, VTC-2, SK-9 types ( «Catalog of Summers laboratories).). Consecutive scanning of every recording layer by a focused laser beam makes the data recording on a multilayer disc. The same way the reading is made.
- PMMA polymethylmethacrylate
- PMMA polymethylmethacrylate
- HIDC Iodide fluorescent dye - 0,01%
- the compound solvent was filtered, deposited on a glass disc and dried to form a recording layer with 500 nm thickness.
- the recording layer medium we prepared the methylene chloride solution, containing 1% polymethylmethacrylate (PMMA), as fluorescent dye - 0,009%
- HITC Iodide with ⁇ max. abc. — 751 nm and ⁇ max. fluor. 790 nm (Exciton, Inc.) and as a compound generating free radicals - 0,002% benzyl peroxide.
- the compound solvent was filtered, deposited on a glass disc and dried to form a recording layer with 500 nm thickness.
- the compound solvent was filtered, deposited on a glass disc and dried to form a recording layer with 500 nm thickness.
- the compound solvent was filtered, deposited on a glass disc and dried to form a recording layer with 500 nm thickness.
- the polyvynilacetate (1%), HITC Iodide (Exciton, Inc.) (0,009%), dioctyl phthalate (0,2%) and benzyl peroxide (0,002%) were dissolved in a mixture of ethanol, ethyl cellosolve, iso-propanol, and iso-butanol
- the compound solvent was filtered, deposited on a glass disc and dried to form a recording layer with 500 nm thickness.
- the recording layer had two sub-layers.
- the lower sub-layer of 250 nm thickness contained fluorescent dye, while the upper sub-layer of 250 nm thickness contained benzyl peroxide - as the substance generating free radicals at high temperature. All the other mentioned additives were equally distributed in the two sub-layers.
- the recording layer had two sub-layers.
- the lower sub-layer of 250 nm thickness contained benzyl peroxide - as the substance generating free radicals at high temperature, while the upper sub-layer of 250 nm thickness contained fluorescent dye. All the other mentioned additives were equally distributed in the two sub-layers.
- Every optical disc obtained according to examples 1-13 was placed on the rotating table, rotated with the speed of 1800 ⁇ m, and recorded by focused pulses of 1 MHz frequency, received from a semiconductor laser with 830 or 650 nm wavelength.
- the recording power was 30-60 mJ/cm 2 .
- An optical microscope was use to follow physical and chemical changes of the layer after recording.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/674,994 US7094517B1 (en) | 1998-05-13 | 1999-05-13 | Recording layer with organic dye-in-polymer (DIP) medium for write-once-read-many (WORM) optical discs with fluorescent reading |
JP2000548872A JP2002515353A (en) | 1998-05-13 | 1999-05-13 | Fluorescent read-out, once-write, multiple-read / non-rewritable (WORM) organic stained polymer (DIP) media for optical discs |
AU46398/99A AU4639899A (en) | 1998-05-13 | 1999-05-13 | Organic dye-in-polymer (dip) medium for write-once-read-many (worm) optical discs with fluorescent reading |
EP99929620A EP1103046A4 (en) | 1998-05-13 | 1999-05-13 | Organic dye-in-polymer (dip) medium for write-once-read-many (worm) optical discs with fluorescent reading |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US8533498P | 1998-05-13 | 1998-05-13 | |
US60/085,334 | 1998-05-13 |
Publications (3)
Publication Number | Publication Date |
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WO1999059142A2 true WO1999059142A2 (en) | 1999-11-18 |
WO1999059142A3 WO1999059142A3 (en) | 2000-06-29 |
WO1999059142A8 WO1999059142A8 (en) | 2000-07-27 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB1999/001266 WO1999059142A2 (en) | 1998-05-13 | 1999-05-13 | Organic dye-in-polymer (dip) medium for write-once-read-many (worm) optical discs with fluorescent reading |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1103046A4 (en) |
JP (1) | JP2002515353A (en) |
AU (1) | AU4639899A (en) |
WO (1) | WO1999059142A2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001006505A1 (en) * | 1999-07-15 | 2001-01-25 | Trid Store Ip, L.L.C. | Multilayer fluorescent optical disc with photosensitive fluorescent material |
EP1131202A1 (en) * | 1998-09-17 | 2001-09-12 | TriD Store IP, LLC | Organic recording medium for fluorescent worm disks |
WO2001093258A2 (en) * | 2000-06-02 | 2001-12-06 | Trid Store Ip Llc | Multilayer recordable optical medium with fluorescent reading |
SG96215A1 (en) * | 2001-05-08 | 2003-05-23 | Sony Electronics Singapore Pte | Recovering recorded information from an optical disk |
US9275671B2 (en) | 2011-06-09 | 2016-03-01 | Case Western Reserve University | Optical information storage medium |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US5185233A (en) * | 1986-04-11 | 1993-02-09 | Canon Kabushiki Kaisha | Method of optical recording employing free radicals |
US5506357A (en) * | 1983-01-12 | 1996-04-09 | Tdk Corporation | Cyanine dyes for use in optical recording medium |
Family Cites Families (3)
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JPS6398493A (en) * | 1986-10-15 | 1988-04-28 | Sony Corp | Optical recording medium |
US5318882A (en) * | 1989-05-16 | 1994-06-07 | Taiyo Yuden Co., Ltd. | Optical recording medium containing a light stabilizer comprised of aryl nitrogen compound |
US6071671A (en) * | 1996-12-05 | 2000-06-06 | Omd Devices Llc | Fluorescent optical memory |
-
1999
- 1999-05-13 WO PCT/IB1999/001266 patent/WO1999059142A2/en active Search and Examination
- 1999-05-13 AU AU46398/99A patent/AU4639899A/en not_active Abandoned
- 1999-05-13 EP EP99929620A patent/EP1103046A4/en not_active Withdrawn
- 1999-05-13 JP JP2000548872A patent/JP2002515353A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5506357A (en) * | 1983-01-12 | 1996-04-09 | Tdk Corporation | Cyanine dyes for use in optical recording medium |
US5185233A (en) * | 1986-04-11 | 1993-02-09 | Canon Kabushiki Kaisha | Method of optical recording employing free radicals |
Non-Patent Citations (1)
Title |
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See also references of EP1103046A2 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1131202A1 (en) * | 1998-09-17 | 2001-09-12 | TriD Store IP, LLC | Organic recording medium for fluorescent worm disks |
EP1131202A4 (en) * | 1998-09-17 | 2002-02-06 | Trid Store Ip Llc | Organic recording medium for fluorescent worm disks |
WO2001006505A1 (en) * | 1999-07-15 | 2001-01-25 | Trid Store Ip, L.L.C. | Multilayer fluorescent optical disc with photosensitive fluorescent material |
WO2001093258A2 (en) * | 2000-06-02 | 2001-12-06 | Trid Store Ip Llc | Multilayer recordable optical medium with fluorescent reading |
WO2001093258A3 (en) * | 2000-06-02 | 2002-03-14 | Trid Store Ip Llc | Multilayer recordable optical medium with fluorescent reading |
SG96215A1 (en) * | 2001-05-08 | 2003-05-23 | Sony Electronics Singapore Pte | Recovering recorded information from an optical disk |
US6816451B2 (en) | 2001-05-08 | 2004-11-09 | Sony Corporation | Recovering recorded information from an optical disk |
US9275671B2 (en) | 2011-06-09 | 2016-03-01 | Case Western Reserve University | Optical information storage medium |
Also Published As
Publication number | Publication date |
---|---|
WO1999059142A3 (en) | 2000-06-29 |
EP1103046A2 (en) | 2001-05-30 |
AU4639899A (en) | 1999-11-29 |
EP1103046A4 (en) | 2003-01-08 |
WO1999059142A8 (en) | 2000-07-27 |
JP2002515353A (en) | 2002-05-28 |
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