US4737427A
Expired / Lapsed
US
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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: 1988-04-12
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Expires: 2006-03-05
Abstract
Abstract A 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
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:30
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: 24
Claim 1
Independent Claim
62 words
An optical recording medium comprising an optically transparent substrate and a recording layer formed on said substrate and comprising at least two J-aggregates of at least two photochromatic dyes, respectively, 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-aggregates.
Claim 2
Dependent Claim
62 words
An optical recording medium comprising an optically transparent substrate and a recording layer formed on said substrate and comprising at least two J-aggregates of at least two photochromatic dyes, respectively, 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-aggregates.
Claim 3
Dependent Claim
20 words
An optical recording medium according to claim 1, wherein said recording layer consists essentially of the J-aggregates of said dyes.
Claim 4
Dependent Claim
19 words
An optical recording medium according to claim 1, wherein said aggregates of said dyes are formed as separate sub-layers.
Claim 5
Dependent Claim
22 words
An optical recording medium according to claim 1, wherein the spiropyran dye is used in combination with a semi-solid or solid alkane.
Claim 6
Dependent Claim
114 words
An optical recording medium according to claim 1, wherein said spiropyran dye has the general formula ##STR4## in which R 1 and R 2 independently represent an alkyl group having from 1 to 5 carbon atoms or an aromatic group, R 3 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 H 2n COO--, --C n H 2n NHCO--, --C n H 2n CONH--, and --C n H 2n O--, wherein n≧0, R 4 represents an alkyl group having from 1 to 30 carbon atoms, and Y represents an oxygen or sulfur atom.
Claim 7
Dependent Claim
15 words
An optical recording medium according to claim 5, wherein X in the formula is --O--.
Claim 8
Dependent Claim
14 words
An optical recording medium according to claim 5, wherein X is --CH 2 OCO--.
Claim 9
Dependent Claim
14 words
An optical recording medium according to claim 1, wherein said dyes are cyanine dyes.
Claim 10
Dependent Claim
23 words
An optical recording medium according to claim 8, wherein said cyanine dyes are dissolved in a solvent to form corresponding J-aggregates and gelled.
Claim 11
Independent Claim
67 words
A method for making an optical recording medium which comprises dissolving, an inert solvent, at least two photochromatic dyes capable of forming at least two J-aggregates, respectively, 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 12
Independent Claim
67 words
A method for making an optical recording medium which comprises dissolving, an inert solvent, at least two photochromatic dyes capable of forming at least two J-aggregates, respectively, 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 13
Dependent Claim
25 words
A method according to claim 10, wherein said substrate is a glass disc and is treated on the surfaces thereof to render the surfaces hydrophobic.
Claim 14
Dependent Claim
27 words
A method according to claim 10, wherein said at least two dyes are dissolved in separate solvents and applied onto the substrate separately by the Langmuir-Blodgett method.
Claim 15
Dependent Claim
16 words
A method according to claim 10, wherein the heating temperature ranges from 30° to 45° C.
Claim 16
Independent Claim
80 words
A method for making an optical recording medium which comprises dissolving, in an inert solvent, at least two photochromatic dyes capable of forming at least two J-aggregates, respectively, 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 17
Independent Claim
80 words
A method for making an optical recording medium which comprises dissolving, in an inert solvent, at least two photochromatic dyes capable of forming at least two J-aggregates, respectively, 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 18
Dependent Claim
25 words
A method according to claim 14, wherein said substrate is a glass disc and is treated on the surfaces thereof to render the surfaces hydrophobic.
Claim 19
Dependent Claim
26 words
A method according to claim 14, wherein said at least two dyes are dissolved in separate solvents and applied onto the substrate separately by the method.
Claim 20
Dependent Claim
14 words
A method according to claim 14, wherein said method is a spin coating method.
Claim 21
Dependent Claim
59 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 photochromatic spiropyran 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 22
Dependent Claim
59 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 photochromatic spiropyran 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 23
Dependent Claim
70 words
An optical recording medium comprising an optically transparent substrate and comprising J-aggregates of at least two photochromatic 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, said dyes comprising a combination of at least two dyes selected from the group consisting of 6-nitro-1'-octadecyl-8-docosanoyloxy-3',3'-dimethylspiro[2H-1-benzopyran-2,2'-indoline], 6-hydroxy-1'-octadecyl-3',3'-dimethylspiro[2H-1-benzopyran-2,2'-indoline] and 6-nitro-1'-octadecyl-8-docosanoyloxy-3',3'-dimethylspiro[2H-1-benzothiopyran-2,2'-indoline].
Claim 24
Dependent Claim
70 words
An optical recording medium comprising an optically transparent substrate and comprising J-aggregates of at least two photochromatic 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, said dyes comprising a combination of at least two dyes selected from the group consisting of 6-nitro-1'-octadecyl-8-docosanoyloxy-3',3'-dimethylspiro[2H-1-benzopyran-2,2'-indoline], 6-hydroxy-1'-octadecyl-3',3'-dimethylspiro[2H-1-benzopyran-2,2'-indoline] and 6-nitro-1'-octadecyl-8-docosanoyloxy-3',3'-dimethylspiro[2H-1-benzothiopyran-2,2'-indoline].
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |