US4308545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protected optical disc
Assignee: Thales SA
•
Filing: 1979-09-25
•
Granted: 1981-12-29
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Expires: 1999-09-25
Abstract
Abstract This disc has a layer of an inscribable and optically legible recording material deposited on a transparent plate traversed by the recording or reading beam and protected from the outside by a cover formed for example by a metal sheet, whose two surfaces are fixed to the layer so as to form a space in front of the latter.
Inventors
- 👤 Jean-Claude Lehureau
- 👤 Henriette Magna
- 👤 Michel Thirouard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:51
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/24015; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/162
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
A protected optical disc for the recording of information comprising a transparent supporting plate and a further support said further support having central and edge ring shaped contact surfaces and therebetween a recess for forming with said supporting plate a chamber insulated from the outside, and supported by said supporting plate within said chamber facing said further support a metal layer inscribable and optically legible by reflection using a radiation beam traversing said supporting plate; the inner face of said further support being provided with an antioxidant deposit extending in said chamber for preventing oxidation of said metal layer.
Claim 2
Dependent Claim
99 words
A protected optical disc for the recording of information comprising a transparent supporting plate and a further support said further support having central and edge ring shaped contact surfaces and therebetween a recess for forming with said supporting plate a chamber insulated from the outside, and supported by said supporting plate within said chamber facing said further support a metal layer inscribable and optically legible by reflection using a radiation beam traversing said supporting plate; the inner face of said further support being provided with an antioxidant deposit extending in said chamber for preventing oxidation of said metal layer.
Claim 3
Dependent Claim
21 words
A disc according to claim 1, wherein said deposit is a metal; said metal being more electropositive than said metal layer.
Claim 4
Dependent Claim
19 words
A disc according to claim 1, wherein said deposit is a layer of organic material containing an antioxidant material.
Claim 5
Dependent Claim
17 words
A disc according to claim 3, wherein said antioxidant material is in the form of metal particles.
Claim 6
Dependent Claim
15 words
A disc according to claim 3, wherein said antioxidant material is an unsaturated metal oxide.
Claim 7
Dependent Claim
48 words
A disc according to claim 1, wherein said metal layer has a ring shaped inscription region bounded by coaxial outer and inner rings; said recess being an annular chamber overhanging said inscription region; said further support resting on said supporting plate along said coaxial outer and inner rings.
Claim 8
Dependent Claim
34 words
A disc according to claim 1, wherein said further support is a body of organic material having an annular depression, a central hole and two ring shaped coaxial bearing areas bounding said annular depression.
Claim 9
Dependent Claim
92 words
A protected optical disc for the recording of information comprising: a transparent supporting plate; a stamped sheet of metal forming a further support and having an annular depression, a central hole and two ring shaped coaxial bearing areas bounding said annular depression, said depression facing said supporting plate and forming a chamber insulated from the outside; a structure on said plate and extending in said chamber, inscribable and optically legible by reflection using a radiation beam traversing said supporting plate; and an anti-oxidant deposit on said further support and within said chamber.
Claim 10
Dependent Claim
92 words
A protected optical disc for the recording of information comprising: a transparent supporting plate; a stamped sheet of metal forming a further support and having an annular depression, a central hole and two ring shaped coaxial bearing areas bounding said annular depression, said depression facing said supporting plate and forming a chamber insulated from the outside; a structure on said plate and extending in said chamber, inscribable and optically legible by reflection using a radiation beam traversing said supporting plate; and an anti-oxidant deposit on said further support and within said chamber.
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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |