EP0193931A2
Expired / Lapsed
EP
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Optical high density recording mediums, method for making same and method for recording optical information in the medium
Assignee: Panasonic Holdings Corp
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Filing: 1986-03-05
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Granted: —
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Expires: 2006-03-05
Abstract
Abstract An optical recording medium which comprises a substrate and a recording layer of at least two J-aggregates of dyes formed on the substrate is described. The dyes may be photochromic dyes or other types of dyes capable of forming the aggregates which have narrower absorption spectral ranges than original dyes. A plurality of information bits can be written in the recording layer by irradiation of one laser beam spot. The recording layer is formed by an LB film method or a method capable of fluidizing a dye solution in a direction horizontal to the substrate surface. A recording method using the medium is also described.
Inventors
- 👤 Jinsei Miyazaki
- 👤 Eiji Ando
- 👤 Kimiaki Yoshino
- 👤 Kazuhisa Morimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 14:33
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B7/004; G11B7/0045; G11B7/00455; G11B7/241; G11B7/242; G11B7/244; G11B7/246; G11B7/247; G11B7/2472; G11B2007/0003; G11B2007/0009; G11B2007/0013; G11B7/2475; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/163
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
57 words
An optical recording medium comprising an optically transparent substrate and a recording layer formed on said substrate and comprising J-aggregates of at least two dyes having different absorption spectrum ranges optically distinguishable from each other and each capable of undergoing a color change on irradiation of a laser beam having a wavelength inherent to the respective J-aggregate.
Claim 2
Dependent Claim
57 words
An optical recording medium comprising an optically transparent substrate and a recording layer formed on said substrate and comprising J-aggregates of at least two dyes having different absorption spectrum ranges optically distinguishable from each other and each capable of undergoing a color change on irradiation of a laser beam having a wavelength inherent to the respective J-aggregate.
Claim 3
Dependent Claim
21 words
An optical recording medium according to Claim 1, wherein said aggregates of at least two dyes are formed as separate sub-layers.
Claim 4
Dependent Claim
18 words
An optical recording medium according to Claim 1, wherein said at least two dyes are photochromic spiropyran dyes.
Claim 5
Dependent Claim
22 words
An optical recording medium according to Claim 3, wherein the spiropyran dye is used in combination with a semi-solid or solid alkane.
Claim 6
Dependent Claim
113 words
An optical recording medium according to Claim 4, wherein said spiropyran dye has the general formula in which R, and R 2 independently represent an alkyl group having from 1 to 5 carbon atoms or an aromatic group, R j represents an alkyl group having at least 10 carbon atoms, X is a single bond or a group selected from the following formulas -C n H 2n OCO-, -C n Hz n COO-, -C n H 2n NHCO-, -C n H 2n CONH-, and -C n H 2n O-, wherein n ≧ 0, R4 represents an alkyl group having from 1 to 30 carbon atoms, and Y represents an oxygen or sulfur atom.
Claim 7
Dependent Claim
14 words
An optical recording medium according to Claim 1, wherein said dyes are cyanine dyes.
Claim 8
Dependent Claim
23 words
An optical recording medium according to Claim 11, wherein said cyanine dyes are dissolved in a solvent to from corresponding J-aggregates and gelled.
Claim 9
Independent Claim
64 words
A method for making an optical recording medium which comprises dissolving, in an inert solvent at least two photochromic dyes capable of forming aggregates, applying the resultant solution onto an optically transparent substrate by a Langmuir-Brodgett film method to form a recording layer on the substrate, and heating the recording layer to a temperature sufficient to allow the respective dyes to form aggregates thereof.
Claim 10
Independent Claim
64 words
A method for making an optical recording medium which comprises dissolving, in an inert solvent at least two photochromic dyes capable of forming aggregates, applying the resultant solution onto an optically transparent substrate by a Langmuir-Brodgett film method to form a recording layer on the substrate, and heating the recording layer to a temperature sufficient to allow the respective dyes to form aggregates thereof.
Claim 11
Independent Claim
76 words
A method for making an optical recording medium which comprises dissolving, in an inert solvent, at least two photochromic dyes capable of forming aggregates, applying the resultant solution onto a substrate while fluidizing the solution in a direction horizontal to the substrate surface on which the solution has been applied, thereby forming a recording layer on the substrate, and heating the recording layer to a temperature sufficient to allow the respective dyes to form aggregates thereof.
Claim 12
Independent Claim
76 words
A method for making an optical recording medium which comprises dissolving, in an inert solvent, at least two photochromic dyes capable of forming aggregates, applying the resultant solution onto a substrate while fluidizing the solution in a direction horizontal to the substrate surface on which the solution has been applied, thereby forming a recording layer on the substrate, and heating the recording layer to a temperature sufficient to allow the respective dyes to form aggregates thereof.
Claim 13
Independent Claim
76 words
A method for recording optical information which comprises providing an optical recording medium having an optically transparent substrate and a layer formed on said substrate and comprising at least two dyes capable of forming corresponding aggregates thereof, irradiating the layer with a UV ray to form photomerocyanines of the at least two dyes, heating the layer to a temperature sufficient to cause the respective photomerocyanines to form aggregates, and subjecting the resultant medium optical information recording.
Claim 14
Independent Claim
76 words
A method for recording optical information which comprises providing an optical recording medium having an optically transparent substrate and a layer formed on said substrate and comprising at least two dyes capable of forming corresponding aggregates thereof, irradiating the layer with a UV ray to form photomerocyanines of the at least two dyes, heating the layer to a temperature sufficient to cause the respective photomerocyanines to form aggregates, and subjecting the resultant medium optical information recording.
Claim 15
Dependent Claim
17 words
A method according to Claim 10, further comprising heating the recording medium to erase the optical information.
References Cited (Backward Citations)
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