US4020278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data carrier for optical read-out
Assignee: Thomson-Brandt SA
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Filing: 1975-10-16
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Granted: 1977-04-26
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Expires: 1995-10-16
Abstract
Abstract The present invention relates to data carriers intended for optical read out. The data carrier in accordance with the invention comprises: a first transparent material at the surface of which the information is recorded in the form of an embossed pattern; a partially transparent metal layer covers said embossed pattern and a second, thick transparent material is deposited upon the metal layer for protection purposes.
Inventors
- 👤 Bernard Carre
- 👤 Claude Puech
- 👤 Erich Spitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:19
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/24018
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
81 words
A data carrier for optical read-out with a predetermined radiation, said data carrier comprising: a substrate transparent to said radiation, an embossed pattern representative of said data provided at the surface of said substrate, a thin metal layer deposited upon said embossed pattern and a protective layer transparent to said radiation overlaying said metal layer; the thickness of said thin metal layer being selected for partially reflecting said radiation; said thin metal layer being deposited over the whole of said surface.
Claim 2
Dependent Claim
81 words
A data carrier for optical read-out with a predetermined radiation, said data carrier comprising: a substrate transparent to said radiation, an embossed pattern representative of said data provided at the surface of said substrate, a thin metal layer deposited upon said embossed pattern and a protective layer transparent to said radiation overlaying said metal layer; the thickness of said thin metal layer being selected for partially reflecting said radiation; said thin metal layer being deposited over the whole of said surface.
Claim 3
Dependent Claim
24 words
A data carrier as claimed in claim 1, wherein said substrate and said protective layer are made of materials having the same refractive index.
Claim 4
Dependent Claim
21 words
A data carrier as claimed in claim 1, wherein said thickness is substantially smaller than the depth of said embossed pattern.
Claim 5
Dependent Claim
26 words
A data carrier as claimed in claim 1, wherein the amounts of said radiation respectively reflected and transmitted by said thin metal layer are substantially equal.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |