US4658388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium which includes a corrosion resistant film of a mixture of a carbide and a nitride
Assignee: Canon Inc
•
Filing: 1985-09-24
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Granted: 1987-04-14
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Expires: 2005-09-24
Abstract
Abstract An optical recording medium having a substrate, an optical recording layer formed on the substrate, and at least one film consisting of a carbide and a nitride and formed on the substrate.
Inventors
- 👤 Takahiko Ishiwatari
- 👤 Hiroyoshi Kishi
- 👤 Hisaaki Kawade
- 👤 Masaaki Matsushima
- 👤 Mitsuharu Sawamura
- 👤 Kazuoki Honguu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:12
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/254; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B11/10589; G11B11/10591; G11B7/2548; G11B7/257; G11B7/2578; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24306; G11B2007/25705; G11B2007/2571; G11B2007/25713; G11B2007/25715; G11B7/253; G11B7/2533; G11B7/2534; G11B7/258; G11B7/2585; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/162
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
59 words
An optical recording medium comprising: a substrate; an optical recording layer formed on said substrate for recording and reproducing information by irradiation with a light beam; and a corrosion resistant film formed on at least one side of said optical recording layer, said film consisting of a mixture of silicon carbide and one of silicon nitride and aluminum nitride.
Claim 2
Dependent Claim
59 words
An optical recording medium comprising: a substrate; an optical recording layer formed on said substrate for recording and reproducing information by irradiation with a light beam; and a corrosion resistant film formed on at least one side of said optical recording layer, said film consisting of a mixture of silicon carbide and one of silicon nitride and aluminum nitride.
Claim 3
Dependent Claim
30 words
An optical recording medium according to claim 1, wherein said film is formed on at least one side of said optical recording layer and in contact with said recording layer.
Claim 4
Dependent Claim
28 words
An optical recording medium according to claim 1, wherein said film is formed on at least one side of said optical recording layer with another layer interposed therebetween.
Claim 5
Dependent Claim
38 words
An optical recording medium according to claim 1, wherein said film is a film of a mixture of silicon carbide and silicon nitride containing 10-90 atom % of silicon carbide relative to the total amount of said film.
Claim 6
Dependent Claim
38 words
An optical recording medium according to claim 1, wherein said film is a film of a mixture of silicon carbide and aluminum nitride containing 5-90 atom % of silicon carbide relative to the total amount of said film.
Claim 7
Dependent Claim
17 words
An optical recording medium according to claim 1, wherein the thickness of said film is 50-10000 Å.
Claim 8
Dependent Claim
13 words
An optical recording medium according to claim 1, further comprising a reflecting layer.
Claim 9
Dependent Claim
13 words
An optical recording medium according to claim 1, further comprising an interference layer.
Claim 10
Dependent Claim
29 words
An optical recording medium according to claim 1, wherein said substrate consists of plastic, and said at least one film includes a film formed in contact with said substrate.
Claim 11
Dependent Claim
15 words
An optical recording medium according to claim 1, wherein said recording layer consists of GdTbFe.
Claim 12
Dependent Claim
15 words
An optical recording medium according to claim 1, wherein said recording layer consists of GdTbFeCo.
References Cited (Backward Citations)
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JPS5674843A
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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) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |