US4313188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recording an ablative optical recording medium
Assignee: RCA Corp
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Filing: 1979-10-22
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Granted: 1982-01-26
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Expires: 1999-10-22
Abstract
Abstract An ablative optical recording medium comprises a substrate coated with a light reflecting coating of passivated aluminum which in turn is coated with a light absorbing ablative layer. During recording, portions of the light absorbing layer are ablated, or vaporized, by a modulated focussed light beam, thereby exposing portions of the reflective layer. Information is recorded in the form of a reflective-antireflective pattern.
Inventors
- 👤 Robert A. Bartolini
- 👤 William J. Burke
- 👤 Allen Bloom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:49
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G01; G01D; G01D15/00; G01D15/10; G01D15/14; G11B7/252; G11B7/258; G11B7/2585; G11B7/26; G11B7/242; G11B7/244; G11B7/246; G11B2007/24624; G11B7/253; G11B7/2531
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
A method of preparing an information record employing a laser of a given frequency which comprises the steps of: evaporating a layer of aluminum from about 250 to about 500 angstroms thick onto a substrate under vacuum which is reflective at the laser output frequency, oxidizing said aluminum layer to a depth of from about 25 to 30 angstroms, coating said oxidized aluminum layer with an ablative light absorbing layer which is absorptive at the laser output frequency, and recording an information track comprising a light reflective-light absorptive pattern.
Claim 2
Independent Claim
89 words
A method of preparing an information record employing a laser of a given frequency which comprises the steps of: evaporating a layer of aluminum from about 250 to about 500 angstroms thick onto a substrate under vacuum which is reflective at the laser output frequency, oxidizing said aluminum layer to a depth of from about 25 to 30 angstroms, coating said oxidized aluminum layer with an ablative light absorbing layer which is absorptive at the laser output frequency, and recording an information track comprising a light reflective-light absorptive pattern.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein said light absorbing layer is applied by evaporation under vacuum.
Claim 4
Dependent Claim
13 words
A method according to claim 2 wherein said light absorbing layer is fluorescein.
Claim 5
Dependent Claim
13 words
A method according to claim 2 wherein said light absorbing layer is 4-phenylazo-1-naphthylamine.
Claim 6
Dependent Claim
14 words
The method according to claim 1 wherein said information track corresponds to video information.
Claim 7
Dependent Claim
11 words
The method according to claim 1 wherein said substrate is glass.
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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) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |