US4176277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosensitive data-carrier designed for the recording of information and a method of recording information on such a data-carrier
Assignee: Thomson-Brandt SA
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Filing: 1977-10-18
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Granted: 1979-11-27
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Expires: 1997-10-18
Abstract
Abstract The present invention relates to data-carrier intended for the high-density recording of information by the use of an etching radiation beam. The data-carrier comprises a substrate upon which there are deposited a very thin film which is absorbent at the wavelength of the etching beam, and a film which is thermodegradable at a temperature lower than the degradation temperature of the absorbent film, the heat developed in the absorbent film being selectively diffused towards the adjacent thermodegradable film.
Inventors
- 👤 Claude Bricot
- 👤 Jean-Claude Dubois
- 👤 Francois LeCarvennec
- 👤 Jean-Claude Lehureau
- 👤 Henriette Magna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:20
CPC Classifications
G; G11; G11B; G11B11/00; G11B7/00; G11B7/24; G11B7/241; G11B7/26; G11B7/242; G11B7/243; G11B7/2433; G11B7/252; G11B7/253; G11B7/2531; G11B7/2533; G11B7/2535; G11B7/257; G11B7/2572; G11B7/2575; Y; Y10; Y10S; Y10S430/00; Y10S430/165
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A thermo-sensitive data-carrier for the recording of information by etching with a concentrated recording radiation, comprising at least a thermo-sensitive film deposited upon a thermally insulating substrate, said thermo-sensitive film being formed by an absorbent film in contact with the substrate and a film thermodegradable at a temperature T 1 , affixed to the absorbent film, the etching radiation incident upon the thermodegradable film passing through said film and being absorbed to a small extent only, the major absorption of it taking place in the absorbent film which converts said radiation into heat and selectively diffuses said heat to said thermodegradable film.
Claim 2
Dependent Claim
102 words
A thermo-sensitive data-carrier for the recording of information by etching with a concentrated recording radiation, comprising at least a thermo-sensitive film deposited upon a thermally insulating substrate, said thermo-sensitive film being formed by an absorbent film in contact with the substrate and a film thermodegradable at a temperature T 1 , affixed to the absorbent film, the etching radiation incident upon the thermodegradable film passing through said film and being absorbed to a small extent only, the major absorption of it taking place in the absorbent film which converts said radiation into heat and selectively diffuses said heat to said thermodegradable film.
Claim 3
Dependent Claim
101 words
A thermo-sensitive data-carrier for the recording of information by etching with a concentrated recording radiation, comprising at least a thermosensitive film deposited upon a thermally insulating substrate, said thermosensitive film being formed by a film thermodegradable at a temperature T 1 in contact with the substrate and an absorbent film sticked to the thermodegradable film, the etching radiation being incident upon the absorbent film which diffuses the heat towards the underlying zones of the thermodegradable film and decomposes them, producing local variations in the structure of the absorbent film by mechanical attack, decomposition products of the thermodegradable film producing explosive mixtures.
Claim 4
Dependent Claim
101 words
A thermo-sensitive data-carrier for the recording of information by etching with a concentrated recording radiation, comprising at least a thermosensitive film deposited upon a thermally insulating substrate, said thermosensitive film being formed by a film thermodegradable at a temperature T 1 in contact with the substrate and an absorbent film sticked to the thermodegradable film, the etching radiation being incident upon the absorbent film which diffuses the heat towards the underlying zones of the thermodegradable film and decomposes them, producing local variations in the structure of the absorbent film by mechanical attack, decomposition products of the thermodegradable film producing explosive mixtures.
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) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |