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US4358780A
Expired / Lapsed
US
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Optical information record member
Assignee: Sony Corp
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Filing: 1981-07-10
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Granted: 1982-11-09
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Expires: 2001-07-10
Abstract
Abstract An optical information record member having a substrate and an optical information carrier layer formed on the substrate is disclosed. The layer is composed of 40 to 80 atomic % of In and 60 to 20 atomic % of one of Se and S. The layer will be changed into a material which is insoluble to alkaline etchant upon the exposure to a light beam which is modulated in response to information signals to be recorded.
Inventors
- 👤 Noboru Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:54
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G03; G03F; G03F7/00; G03F7/004; G03F7/0042; G03F7/0043; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
An optical information record member, comprising a substrate and an optical information carrier layer formed on said substrate, said layer being composed of 40 to 80 atomic % of In and 60 to 20 atomic % of one of Se and S, said layer being changed into a material which is insoluble to alkaline etchant upon exposure to a light beam modulated according to information signals.
Claim 2
Dependent Claim
66 words
An optical information record member, comprising a substrate and an optical information carrier layer formed on said substrate, said layer being composed of 40 to 80 atomic % of In and 60 to 20 atomic % of one of Se and S, said layer being changed into a material which is insoluble to alkaline etchant upon exposure to a light beam modulated according to information signals.
Claim 3
Dependent Claim
20 words
An optical information record member according to claim 1, wherein said layer has a thickness between 500 and 2000 A.
Claim 4
Dependent Claim
34 words
An optical information record member according to claim 1, wherein said layer is composed of 60 to 80 atomic % of In and 40 to 20 atomic % of one of Se and S.
Claim 5
Dependent Claim
27 words
An optical information record member according to claim 1, said carrier further comprises a layer of Cr interposed between said substrate and said optical information carrier layer.
Claim 6
Dependent Claim
20 words
An optical information record member according to claim 4, said layer of Cr has a thickness greater than 50 A.
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) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |