Patent US4950520A successfully refreshed from Google Patents.
US4950520A
Expired / Lapsed
US
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Optical recording medium and method manufacturing thereof
Assignee: Pioneer Video Corp
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Filing: 1986-12-29
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Granted: 1990-08-21
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Expires: 2006-12-29
Abstract
Abstract An optical disk and method of preparing it in which a macromolecular substrate has information bits mechanically formed on its surface and a reflective metallic reflective film is deposited thereover. The grain size of the metallic reflective film is kept to less than 50 nanometers by depositing at a rate of no more than 1.5 nanometers per second.
Inventors
- 👤 Kunio Imai
- 👤 Saburo Aso
- 👤 Hideo Kudo
- 👤 Masataka Uchidoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:35
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B7/241; G11B7/252; G11B7/258; G11B7/253; G11B7/2533; G11B7/254; G11B7/2542; G11B7/2585; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/31504; Y10T428/31511; Y10T428/31529
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
78 words
An optical recording medium, comprising: a substrate having a surface on which indent information bits are formed, said substrate being made of a macromolecular material compound comprising components having a polar group at their side chains, and a reflective film formed on said surface of said substrate over said information signal bits, said reflective film being made of a metallic material, a crystal grain size of said reflective film being selected to be not larger than 50 nanometers.
Claim 2
Dependent Claim
78 words
An optical recording medium, comprising: a substrate having a surface on which indent information bits are formed, said substrate being made of a macromolecular material compound comprising components having a polar group at their side chains, and a reflective film formed on said surface of said substrate over said information signal bits, said reflective film being made of a metallic material, a crystal grain size of said reflective film being selected to be not larger than 50 nanometers.
Claim 3
Dependent Claim
17 words
An optical recording medium as recited in claim 1, wherein said macromolecular compound is an acrylic resin.
Claim 4
Dependent Claim
19 words
An optical recording medium as recited in claim 1, wherein said metallic material is aluminum or an aluminum alloy.
Claim 5
Dependent Claim
21 words
An optical recording medium as recited in claim 1, further comprising a protective film formed on each of said reflective films.
Claim 6
Dependent Claim
116 words
An optical recording medium, comprising: two substrates, each said substrate having a surface on which indent information signal bits are formed, each said substrate being made of a macromolecular material compound comprising components having a polar group at their side chains, a reflective film formed on said surface of each of said substrates over said information signal bits, said reflective film being made of a metallic material, a crystal grain size of said reflective film being selected to be not larger than 50 nanometers, a protective film formed on said reflective film, and an adhesive applied on at least one surface of said protective film, wherein said two substrates are stacked together with the respective surfaces.
Claim 7
Dependent Claim
116 words
An optical recording medium, comprising: two substrates, each said substrate having a surface on which indent information signal bits are formed, each said substrate being made of a macromolecular material compound comprising components having a polar group at their side chains, a reflective film formed on said surface of each of said substrates over said information signal bits, said reflective film being made of a metallic material, a crystal grain size of said reflective film being selected to be not larger than 50 nanometers, a protective film formed on said reflective film, and an adhesive applied on at least one surface of said protective film, wherein said two substrates are stacked together with the respective surfaces.
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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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |