EP0179436A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical recording medium
Assignee: Panasonic Holdings Corp
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Filing: 1985-10-22
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Granted: —
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Expires: 2005-10-22
Abstract
Abstract An optical recording medium is prepared by the use of spiropyrane whose molecular structure contains an alkyl chain having at least 10 more carbon atoms, and by the use of an LB film method or a spin coating method. This recording medium is of a structure wherein when irradiated with the UV, the spiropyrane is photo-isomerized to photomerocyane and, thereafter, when subsequently heated at 35 to 40°C for 15 minutes, a J-aggregate of the photomerocyane is formed in very stabilized form. When the recording medium is irradiated with light of wavelength of visible spectrum, the color is bleached with the information consequently recorded. The optical recording medium herein disclosed is rewritable and can retain the recorded information for 5,000 hours or more.
Inventors
- 👤 Jinsei Miyazaki
- 👤 Eiji Ando
- 👤 Kimiaki Yoshino
- 👤 Kazuhisa Morimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 21:56
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/246; G11B7/247; G11B7/2475; G11B7/252; G11B7/253; G11B7/2531; Y; Y10; Y10S; Y10S430/00; Y10S430/163
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
23 words
An optical recording medium comprising a recording layer formed thereon, said recording layer containing an aggregate, or a preaggregate, of a photochromic dye.
Claim 2
Dependent Claim
23 words
An optical recording medium comprising a recording layer formed thereon, said recording layer containing an aggregate, or a preaggregate, of a photochromic dye.
Claim 3
Dependent Claim
22 words
The optical recording medium as claimed in Claim 1, wherein said aggregate or said preaggregate is a J-aggregate or its preaggregate, respectively.
Claim 4
Dependent Claim
15 words
The optical recording medium as claimed in Claim 1, wherein said photochromic dye is spiropyrane.
Claim 5
Dependent Claim
86 words
The optical recording medium as claimed in Claim 3, wherein said spiropyrane is of a type having a molecular structure expressed by the following formula: wherein each of R 1 and R 2 is an alkyl group having at least one carbon atom, R 3 is an alkyl group having at least 10 carbon atoms, X is a single bond or a group of one of the following formulas wherein n ≥ 0 and R 4 is an alkyl group having at least one carbon atom.
Claim 6
Dependent Claim
24 words
The optical recording medium as claimed in Claim 4, wherein R 1 is a substituent group of the following formula: wherein n ≥ 1.
Claim 7
Dependent Claim
61 words
The optical recording medium as claimed in Claim 5, wherein each of R l and R 2 is a substituent group of the formula: CH3; R 3 is a substituent group of the formula: C 18 H 37 ; R is a substituent group of the formula: C 21 H 43 ; and X is a substituent group of the formula:
Claim 10
Independent Claim
47 words
A method for making an optical recording medium having a recording layer containing an aggregate or a preaggregate of a photochromic dye, which method comprises the coating of the photochromic dye on a substrate by the use of an LB film method, thereby forming the recording layer.
Claim 11
Independent Claim
47 words
A method for making an optical recording medium having a recording layer containing an aggregate or a preaggregate of a photochromic dye, which method comprises the coating of the photochromic dye on a substrate by the use of an LB film method, thereby forming the recording layer.
Claim 12
Independent Claim
57 words
A method for making an optical recording medium having a recording layer containing an aggregate or a preaggregate of a photochromic dye, which method comprises the coating of the photochromic dye on a substrate by the use of a method wherein a horizontal force is applied to one surface of the substrate, thereby forming the recording layer.
Claim 13
Independent Claim
57 words
A method for making an optical recording medium having a recording layer containing an aggregate or a preaggregate of a photochromic dye, which method comprises the coating of the photochromic dye on a substrate by the use of a method wherein a horizontal force is applied to one surface of the substrate, thereby forming the recording layer.
Claim 14
Dependent Claim
21 words
The method as claimed in Claim 8, wherein said method wherein the horizontal force is applied is a spin coating method.
Claim 15
Dependent Claim
36 words
A recording method for an optical recording medium having a recording layer containing photochromic dye, which method includes a process of forming an aggregate of the photochromic dye within the recording layer during recording or erasure.
Claim 16
Dependent Claim
36 words
A recording method for an optical recording medium having a recording layer containing photochromic dye, which method includes a process of forming an aggregate of the photochromic dye within the recording layer during recording or erasure.
Claim 17
Dependent Claim
13 words
The method as claimed in Claim 10, wherein said aggregate is a J-aggregate.
Claim 18
Dependent Claim
45 words
The method as claimed in Claim 10, wherein said process is heating at such a temperature, and for such a time, as required to avoid the occurrence of any possible reversible change in the molecular structure of the photochromic dye contained in the recording layer.
References Cited (Backward Citations)
No citation records indexed.
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