US4554655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical data recording disc and system
Assignee: Pioneer Video Corp
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Filing: 1983-02-23
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Granted: 1985-11-19
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Expires: 2003-02-23
Abstract
Abstract An optical data recording disc has a protrusion forming layer which is formed on a gas generating metal layer, and the gas generating metal layer, in turn, is formed on an optically polished disc. An optical beam is modulated by data and impinges on the gas generating metal layer, which locally evaporates the metal layer to form a gas. The gas expands and produces protrusions in the protrusion forming layer, and these protrusions are representative of the data. Accordingly, because the protrusions are formed essentially simultaneously with the recording operation, it is possible to reproduce the data being recorded immediately after the data is recorded so that failures in a recording device or in the optical data recording disc can be detected immediately.
Inventors
- 👤 Osamu Kumasaka
- 👤 Teruo Touma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:05
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; B; B05; B05D; B05D7/00; B05D7/02; C; C03; C03C; C03C17/00; C03C17/34; C03C17/36; C03C17/38; G11B7/241; G11B7/242; G11B7/243; G11C; G11C13/00; G11C13/04; G11C17/00; G11C17/14; G11C17/143; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; G11B7/004; G11B7/0045; G11B7/00452
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
An optical data recording disc, comprising: an optically polished disc; a gas generated metal layer formed on said disc; and a protrusion forming layer formed on said gas generating metal layer, said gas generating metal layer being evaporated to produce a gas by an optical beam having an intensity modulated by data, said gas forming protrusions in said protrusion forming layer which are representative of said data, said metal layer acting as an adhesive between said optically polished disc and said protrusion forming layer.
Claim 2
Dependent Claim
84 words
An optical data recording disc, comprising: an optically polished disc; a gas generated metal layer formed on said disc; and a protrusion forming layer formed on said gas generating metal layer, said gas generating metal layer being evaporated to produce a gas by an optical beam having an intensity modulated by data, said gas forming protrusions in said protrusion forming layer which are representative of said data, said metal layer acting as an adhesive between said optically polished disc and said protrusion forming layer.
Claim 3
Dependent Claim
22 words
The optical data recording disc as claimed in claim 1, wherein said protrusion forming layer is made of a ductile, organic material.
Claim 4
Dependent Claim
30 words
The optical data recording disc as claimed in claim 2, wherein said protrusion forming layer is a photo-resist layer which can be treated to form a further disc for replication.
Claim 5
Dependent Claim
21 words
The optical data recording disc as claimed in claim 1, wherein said optically polished disc is made of glass or plastic.
Claim 6
Dependent Claim
20 words
The optical data recording disc as claimed in claim 4, wherein said plastic is polymethyl methacrylate, polycarbonate, or vinyl chloride.
Claim 7
Dependent Claim
41 words
The optical data recording disc as claimed in claim 1, wherein said protrusion forming layer has a thickness of λ/4n where λ is a wavelength of a reproducing light source and n is a refractive index of a reproducing disc material.
Claim 8
Dependent Claim
28 words
The optical data recording disc as claimed in claim 1, wherein said protrusion forming layer is a macromolecular material which is capable of being dissolved in a solvent.
Claim 9
Dependent Claim
25 words
The optical data recording disc as claimed in claim 1, wherein said gas generating metal layer has a thickness of no more than 200 Å.
Claim 10
Dependent Claim
38 words
The optical data recording disc as claimed in claim 1, further comprising means for reproducing said data from said optical data recording disc and feeding said reproduced data back to a recording device which generates said optical beam.
Claim 11
Dependent Claim
28 words
The optical data recording disc as claimed in claim 8, wherein said gas generating metal layer is Cr, Al, Te, Bi, Ag, Pb or Sn, or alloys thereof.
References Cited (Backward Citations)
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JPS55154196A
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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) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |