US5034255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium and method of its production
Assignee: Mitsui Chemicals Inc
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Filing: 1989-10-20
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Granted: 1991-07-23
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Expires: 2009-10-20
Abstract
Abstract Disclosed in this invention are optical recording media comprising a substrate, a recording layer formed on the substrate and a protective layer formed on the recording layer, in which the recording layer is irradiated with a beam of energy, thereby causing the change of optical properties at the irradiated portions on the recording layer so as to record information, wherein said recording layer is a thin film containing Te and N, and further Pd, if necessary, and producing methods thereof.
Inventors
- 👤 Shigeto Shigematsu
- 👤 Koji Tsuzukiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:20
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B7/2433; G11B7/26; G11B2007/24302; G11B2007/24306; G11B2007/24316; G11B2007/24318; G11B2007/24322; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10S430/165; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
106 words
An optical recording medium comprising a substrate, a recording layer formed on the substrate and a protective layer formed on the recording layer, in which the recording layer is irradiated with a beam of energy, thereby causing the change of optical properties at the irradiated portions on the recording layer so as to record information, wherein said recording layer is a thin film containing Te and N, the thickness of the recording layer is from 100 Å to 1 μm and the content of N in the recording layer is from 0.1 to 60 atom % based on the total atoms contained in the recording layer.
Claim 2
Dependent Claim
106 words
An optical recording medium comprising a substrate, a recording layer formed on the substrate and a protective layer formed on the recording layer, in which the recording layer is irradiated with a beam of energy, thereby causing the change of optical properties at the irradiated portions on the recording layer so as to record information, wherein said recording layer is a thin film containing Te and N, the thickness of the recording layer is from 100 Å to 1 μm and the content of N in the recording layer is from 0.1 to 60 atom % based on the total atoms contained in the recording layer.
Claim 3
Dependent Claim
107 words
The optical recording medium comprising a substrate, a recording layer formed on the substrate and a protective layer formed on the recording layer, in which the recording layer is irradiated with a beam of energy, thereby causing the change of optical properties at the irradiated portions on the recording layer so as to record information, wherein said recording layer is a thin film containing Te, Pd and N, the thickness of the recording layer is from 100 Å to 1 μm, and the content of Pd in the recording layer is from 1 to 80 atom % based on the total atoms contained in the recording layer.
Claim 4
Dependent Claim
107 words
The optical recording medium comprising a substrate, a recording layer formed on the substrate and a protective layer formed on the recording layer, in which the recording layer is irradiated with a beam of energy, thereby causing the change of optical properties at the irradiated portions on the recording layer so as to record information, wherein said recording layer is a thin film containing Te, Pd and N, the thickness of the recording layer is from 100 Å to 1 μm, and the content of Pd in the recording layer is from 1 to 80 atom % based on the total atoms contained in the recording layer.
Claim 5
Dependent Claim
36 words
The optical recording medium as set forth in claim 1, wherein the content of N in the recording layer is from 0.1 to 60 atom % based on the total atoms contained in the recording layer.
Claim 6
Independent Claim
120 words
A method of producing optical recording media which comprise a substrate, a recording layer containing Te and N formed on the substrate, and the protective layer formed on the recording layer, in which the recording layer is irradiated with a beam of energy, thereby causing the change of optical properties at the irradiated portions on the recording layer so as to record information, wherein said recording layer is formed on the substrate by a reactive sputtering in an atomosphere of Ar and N 2 gas using a Te target, and the flow rate {N 2 /(Ar+N 2 )} of said N 2 to the total flow of Ar and N 2 is in a range of from 5 to 50%.
Claim 7
Independent Claim
120 words
A method of producing optical recording media which comprise a substrate, a recording layer containing Te and N formed on the substrate, and the protective layer formed on the recording layer, in which the recording layer is irradiated with a beam of energy, thereby causing the change of optical properties at the irradiated portions on the recording layer so as to record information, wherein said recording layer is formed on the substrate by a reactive sputtering in an atomosphere of Ar and N 2 gas using a Te target, and the flow rate {N 2 /(Ar+N 2 )} of said N 2 to the total flow of Ar and N 2 is in a range of from 5 to 50%.
Claim 8
Dependent Claim
25 words
The method as set forth in claim 4, wherein said rate {N 2 /(Ar+N 2 )} is in a range of from 10 to 30%.
Claim 9
Independent Claim
124 words
A method of producing optical recording media which comprise a substrate, a recording layer containing Te, Pd and N formed on the substrate, and a protective layer formed on the recording layer, in which the recording layer is irradiated with a beam of energy, thereby causing the change of optical properties at the irradiated portions on the recording layer so as to record information, wherein said recording layer is formed on the substrate by a reactive sputtering in an atmosphere of Ar and N 2 gas using a target comprising Te and Pd, and the flow rate {N 2 /(Ar+N 2 )} of said N 2 to the total flow of Ar and N 2 is in a range of from 1 to 80%.
Claim 10
Independent Claim
124 words
A method of producing optical recording media which comprise a substrate, a recording layer containing Te, Pd and N formed on the substrate, and a protective layer formed on the recording layer, in which the recording layer is irradiated with a beam of energy, thereby causing the change of optical properties at the irradiated portions on the recording layer so as to record information, wherein said recording layer is formed on the substrate by a reactive sputtering in an atmosphere of Ar and N 2 gas using a target comprising Te and Pd, and the flow rate {N 2 /(Ar+N 2 )} of said N 2 to the total flow of Ar and N 2 is in a range of from 1 to 80%.
Claim 11
Dependent Claim
25 words
The method as set forth in claim 6, wherein said rate {N 2 /(Ar+N 2 )} is in a range of from 10 to 40%.
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) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |