US5039558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium and method of manufacturing thereof
Assignee: Pioneer Video Corp
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Filing: 1990-02-08
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Granted: 1991-08-13
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Expires: 2010-02-08
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 22:03
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: 5
Claim 1
Independent Claim
65 words
A method of manufacturing an optical recording medium comprising the steps of: preparing a substrate carrying information signal bits formed as indentations on a surface thereof; and evaporating a metallic reflective film on said surface of said substrate over said information signal bits at a speed not higher than 1.5 nanometers per second to prevent the formation of readout disruptive blisters by said reflective film.
Claim 2
Independent Claim
65 words
A method of manufacturing an optical recording medium comprising the steps of: preparing a substrate carrying information signal bits formed as indentations on a surface thereof; and evaporating a metallic reflective film on said surface of said substrate over said information signal bits at a speed not higher than 1.5 nanometers per second to prevent the formation of readout disruptive blisters by said reflective film.
Claim 3
Dependent Claim
22 words
A method as recited in claim 1, wherein said reflective film is a material essentially consisting of aluminum or an aluminum alloy.
Claim 4
Dependent Claim
22 words
A method as recited in claim 1, wherein said evaporating step is carried out in a vacuum of approximately 10 -4 torr.
Claim 5
Dependent Claim
22 words
A method as recited in claim 1, further comprising a step of applying a protective film on said surface of said substrate.
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) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |