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US4188433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Record carrier in disk form having cover layers
Assignee: US Philips Corp
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Filing: 1978-07-20
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Granted: 1980-02-12
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Expires: 1998-07-20
Abstract
Abstract The invention relates to a disk-shaped record carrier, for example a video plate, which is provided on one side or on both sides with a radiation-reflecting surface structure in the form of an information track consisting of blocks and pits on which a reflecting layer of metal is provided. The plate can be read optically. According to the invention the reflecting metal layer is provided with a cover layer which is formed by a transparent plate which is connected to the metal surface by means of a radiation-curable lacquer. The lacquer is preferably a U.V. curing lacquer and contains a protic mixture of acrylic acid esters. The transparent plate is also preferably manufactured from a transparent synthetic resin and has a thickness of 200 μm.
Inventors
- 👤 Rinse Dijkstra
- 👤 Arnoldus J. M. van den Broek
- 👤 Gerardus J. M. Lippits
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:05
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/254; G11B7/2542; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/306; B32B27/308; B32B7/00; B32B7/04; B32B7/12; G11B7/257; G11B7/2572; G11B7/2575; B32B2307/00; B32B2307/40; B32B2307/412; B32B2327/00; B32B2327/06; B32B2333/00; B32B2333/04; B32B2333/12; B32B2369/00; B32B2429/00; B32B2429/02; G11B7/258; G11B7/2585; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31645; Y10T428/31649; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
68 words
A disk shaped record carrier comprising a substrate, a radiation-reflecting layer of metal on said substrate containing at least one optically readable information path, a radiation-transparent cover plate of a thickness of 0.2-1 mm, formed of glass or a transparent synthetic resin material, covering said reflective metal layer and joined to said reflective metal layer by an ultraviolet curable lacquer composition layer of at most 30μ in thickness.
Claim 2
Dependent Claim
68 words
A disk shaped record carrier comprising a substrate, a radiation-reflecting layer of metal on said substrate containing at least one optically readable information path, a radiation-transparent cover plate of a thickness of 0.2-1 mm, formed of glass or a transparent synthetic resin material, covering said reflective metal layer and joined to said reflective metal layer by an ultraviolet curable lacquer composition layer of at most 30μ in thickness.
Claim 3
Dependent Claim
20 words
The record carrier of claim 1 wherein the ultraviolet curable lacquer composition contains a protic mixture of acrylic acid esters.
Claim 4
Dependent Claim
22 words
The record carrier of claim 2 wherein the protic mixture of acrylic acid esters comprises hydroxy alkyl acrylates or amino alkyl acrylates.
Claim 5
Dependent Claim
39 words
The record carrier of claim 3 wherein the cover plate has a thickness of from 0.2-1 mm and is a transparent synthetic resin selected from the group consisting of polyvinyl chloride, polyvinyl chloride-polyvinyl acetate copolymer, polycarbonate and polymethyl methacrylate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |