US4954841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium and method of manufacturing the same
Assignee: Toshiba Corp
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Filing: 1987-10-22
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Granted: 1990-09-04
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Expires: 2007-10-22
Abstract
Abstract An optical recording medium and methods of manufacturing the same are disclosed. The optical recording medium is provided with a transparent adhesive layer containing organic compounds such as hydrocarbon or the like that constitute resin materials, and metallic compounds whose thermal expansion coefficients are nearly equal to those of inorganic transparent materials that constitute a transparent protective layer, whereby peel-off phenomena to be caused by secular variation can be avoided.
Inventors
- 👤 Katsutarou Ichihara
- 👤 Norio Ozawa
- 👤 Nobuaki Yasuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:53
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/256; G11B7/2403; G11B7/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
65 words
An optical recording medium, comprising: a transparent resin substrate; a transparent protective layer; transparent adhesive layer means between the resin substrate and the protective layer, including a combination of inorganic and hydrocarbon compounds for bonding the protective layer to the resin substrate and for substantially preventing moisture from penetrating between the protective layer and the substrate; and optical recording layer on the transparent protective layer.
Claim 2
Dependent Claim
65 words
An optical recording medium, comprising: a transparent resin substrate; a transparent protective layer; transparent adhesive layer means between the resin substrate and the protective layer, including a combination of inorganic and hydrocarbon compounds for bonding the protective layer to the resin substrate and for substantially preventing moisture from penetrating between the protective layer and the substrate; and optical recording layer on the transparent protective layer.
Claim 3
Dependent Claim
60 words
The optical recording medium of claim 1 wherein the transparent adhesive layer means includes an adhesive layer having a substrate side and a protective side, the concentration of organic compounds on the substrate side being higher than the concentration of metallic compounds, and the concentration of metallic compounds on the protective side being higher than the concentration of organic compounds.
Claim 4
Dependent Claim
22 words
An optical recording layer according to claim 1, wherein said recording layer includes a rare earth-transition metallic amorphous ferrimagnetic alloy thin film.
Claim 5
Dependent Claim
16 words
An optical recording medium according to claim 1, wherein said inorganic compound includes an indium compound.
Claim 6
Dependent Claim
21 words
An optical recording medium according to claim 4, wherein said indium compound includes a mixture of indium oxide and indium nitride.
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) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |