US4686169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium and production of the same
Assignee: Panasonic Holdings Corp
•
Filing: 1985-11-08
•
Granted: 1987-08-11
•
Expires: 2005-11-08
Abstract
Abstract An optical recording medium comprising a substrate and an information recording layer which consists of monolayer assemblies comprising a photochromic compound of which is based on cis-trans isomerization such as an amphipathic derivative of azobenzene, indigo or thioindigo having a long chain substituent, which monolayers are formed on the substrate by the Langmuir-Blodgett method and oriented in a two-dimensional plain. When the recording medium is irradiated by light, light absorption spectrum of the recording layer changes so that information is recorded. Since the photochromic compound is oriented in a monolayer, its photochromism lasts long.
Inventors
- 👤 Kimiaki Yoshino
- 👤 Eiji Ando
- 👤 Jinsei Miyazaki
- 👤 Kazuhisa Morimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:29
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; B; B82; B82Y; B82Y30/00; Y; Y10; Y10S; Y10S430/00; Y10S430/136; Y10S430/146; Y10S430/162; Y10S430/163
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
48 words
An optical recording medium comprising a substrate and an information recording layer which consists of monomolecular layer assemblies comprising a photochromic dye which exhibits photochromism based on cis-trans isomerization and is stable in both cis and trans forms, which monomolecular layer assemblies are oriented in a two-dimensional plane.
Claim 2
Dependent Claim
48 words
An optical recording medium comprising a substrate and an information recording layer which consists of monomolecular layer assemblies comprising a photochromic dye which exhibits photochromism based on cis-trans isomerization and is stable in both cis and trans forms, which monomolecular layer assemblies are oriented in a two-dimensional plane.
Claim 3
Dependent Claim
16 words
An optical recording medium according to claim 1, wherein the photochromic dye has an amphipathic property.
Claim 4
Dependent Claim
19 words
An optical recording medium according to claim 1, wherein the monomolecular assemblies further comprises an amphipathic monomolecular film-forming compound.
Claim 5
Dependent Claim
22 words
An optical recording medium according to claim 1, wherein the photochromic compound is an amphipathic azobenzene derivative having a nitrogen-nitrogen double bond.
Claim 6
Dependent Claim
59 words
An optical recording medium according to claim 4, wherein the azobenzene derivative has a hydrophobic substituent on its chromophore ring selected from an alkyl group having at least 10 carbon atoms, an alkoxy group having at least 10 carbon atoms, an alkylacyl group having at least 10 carbon atoms and an alkylamino group having at least 10 carbon atoms.
Claim 7
Dependent Claim
14 words
An optical recording medium according to claim 5, wherein the azobenzene derivative is 4-monostearoylazobenzene.
Claim 8
Dependent Claim
27 words
An optical recording medium according to claim 2, wherein the amphipathic dye is one selected from the group consisting of an indigo derivative and a thioindigo derivative.
Claim 9
Dependent Claim
61 words
An optical recording medium according to claim 7, wherein the indigo or thioindigo derivative has a hydrophobic substituent on its chromophore ring selected from an alkyl group having at least 10 carbon atoms, an alkoxy group having at least 10 carbon atoms, an alkylacyl group having at least 10 carbon atoms and an alkylamino group having at least 10 carbon atoms.
Claim 10
Dependent Claim
14 words
An optical recording medium according to claim 8, wherein the indigo derivative is N,N'-diacylindigo.
Claim 11
Dependent Claim
12 words
An optical recording medium according to claim 9, wherein N,N'-diacylindigo is N,N'-distearoylindigo.
Claim 12
Dependent Claim
14 words
An optical recording medium according to claim 8, wherein the thioindigo derivative is 5-octadecylthioindigo.
Claim 13
Dependent Claim
14 words
An optical recording medium according to claim 8, wherein the thioindigo derivative is 5-octadecyl-5'-t-butylthioindigo.
Claim 14
Dependent Claim
14 words
An optical recording medium according to claim 8, wherein the thioindigo derivative is 5-octadecyl-1,8-naphtylthioindigo.
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) | 1990-08-10 | 1991-02-09 | 1991-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-10 | 1995-02-09 | 1995-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-10 | 1999-02-09 | 1999-08-11 | $7700.00 | Window Closed / Lapsed |