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Patent US4981777A successfully refreshed from Google Patents.
US4981777A
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Process for preparation of optical recording medium
Assignee: Mitsui Chemicals Inc
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Filing: 1988-11-18
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Granted: 1991-01-01
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Expires: 2008-11-18
Abstract
Abstract A process for the preparation of an optical recording medium, which comprises forming a thin optical recording film comprising at least one low melting point metal, carbon and hydrogen on a substrate, and heat treating the so formed film on said substrate at a temperature of from 70° to 300° C. for a period of at least 5 seconds. The optical recording medium so prepared has an enhanced recording sensitivity and a prolonged service life.
Inventors
- 👤 Mitsuyuki Kuroiwa
- 👤 Koji Tsuzukiyama
- 👤 Hisaharu Toibana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:35
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24304; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
114 words
A process for the preparation of an optical recording medium comprising a substrate and an optical recording film supported on said substrate, said medium being capable of recording information by forming portions of changed physical configurations or optical characteristics in said film by irradiation of energy beams so that the arrangement of said changed portions may correspond to the information to be recorded, which process comprises forming a thin optical recording film comprising at least one low melting point metal element, carbon and hydrogen on said substrate, and heat treating the so formed film on said substrate at a temperature of from 70° to 300° C. for a period of at least 5 seconds.
Claim 2
Dependent Claim
114 words
A process for the preparation of an optical recording medium comprising a substrate and an optical recording film supported on said substrate, said medium being capable of recording information by forming portions of changed physical configurations or optical characteristics in said film by irradiation of energy beams so that the arrangement of said changed portions may correspond to the information to be recorded, which process comprises forming a thin optical recording film comprising at least one low melting point metal element, carbon and hydrogen on said substrate, and heat treating the so formed film on said substrate at a temperature of from 70° to 300° C. for a period of at least 5 seconds.
Claim 3
Dependent Claim
30 words
The process according to claim 1 wherein said low melting metal element is selected from tellurium, bismuth, zinc, cadmium, indium, lead, tin and alloys of at least two of them.
Claim 4
Dependent Claim
14 words
The process according to claim 2 wherein said low melting metal element is tellurium.
Claim 5
Dependent Claim
27 words
The process according to claim 1 wherein said optical recording film further comprises another metal in addition to said low melting point metal element, carbon and hydrogen.
Claim 6
Dependent Claim
12 words
The process according to claim 4 wherein said another metal is antimony.
Claim 7
Dependent Claim
12 words
The process according to claim 4 wherein said another metal is selenium.
Claim 8
Dependent Claim
20 words
The process according to claim 1 wherein the heat treatment is carried out in an atmosphere of a reducing gas.
Claim 9
Dependent Claim
20 words
The process according to claim 1 wherein the heat treatment is carried out in an atmosphere of a reducing gas.
Claim 10
Dependent Claim
28 words
The process according to claim 1 wherein the heat treating is carried out at a temperature of 90° to 300° C. for from 5 seconds to 1,000 minutes.
Claim 11
Dependent Claim
23 words
The process according to claim 9 wherein the heat treating is carried out for a period of from about 5 to 100 minutes.
Claim 12
Dependent Claim
36 words
The process according to claim 4 wherein the optical recording film contains Te, C and H in amounts of 40 to 90 atom percent, 5 to 40 atom percent, and 5 to 40 atom percent, respectively.
Claim 13
Dependent Claim
24 words
The process according to claim 5 wherein the amount of antimony in the optical recording film is from about 1 to 25 atom percent.
Claim 14
Dependent Claim
41 words
The process according to claim 6 wherein the content of Se is such that when the atomic proportion of Te and Se is represented by the formula Te x Se 1-x , x is greater than 0.4 and less than 0.99.
Claim 15
Dependent Claim
16 words
The process according to claim 7 wherein x is greater than 0.5 and less than 0.97.
References Cited (Backward Citations)
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JPH0235888A
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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) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |