US5395735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical information recording medium and method of manufacture
Assignee: Panasonic Holdings Corp
•
Filing: 1993-04-12
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Granted: 1995-03-07
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Expires: 2013-04-12
Abstract
Abstract By forming recording layer (3), or recording material particles (10), (13) dispersed in protection material (9) with the laser sputtering, the initialization of recording layer (3) become, unnecessary or easy, and optical storage medium having long repetition life of recording and erasing is obtained.
Inventors
- 👤 Kenichi Nagata
- 👤 Eiji Ohno
- 👤 Noboru Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:07
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/28; C23C14/06; C23C14/0623; G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A method of manufacturing an optical information recording medium which is provided on a substrate with a recording layer comprising a material capable of being changed from an amorphous to a crystalline state by irradiation with a light beam, and which records, erases or reproduces information by irradiation with a light beam, characterized in that the recording layer is formed in a crystalline state by irradiation pulse laser scanning upon a solid target confronting the substrate and without heat treatment initialization.
Claim 2
Independent Claim
81 words
A method of manufacturing an optical information recording medium which is provided on a substrate with a recording layer comprising a material capable of being changed from an amorphous to a crystalline state by irradiation with a light beam, and which records, erases or reproduces information by irradiation with a light beam, characterized in that the recording layer is formed in a crystalline state by irradiation pulse laser scanning upon a solid target confronting the substrate and without heat treatment initialization.
Claim 3
Dependent Claim
32 words
A method of manufacturing an optical information recording medium according to claim 1, characterized in that the recording layer comprises crystal particles having a most predominant diameter of less than 50 nm.
Claim 4
Dependent Claim
37 words
A method of manufacturing an optical information recording medium according to claim 1, characterized in that the recording layer is formed in the an atmosphere of a vacuum or of inert gas of less than 0.5 mTorr.
Claim 5
Dependent Claim
31 words
A method of manufacturing an optical information recording medium according to claim 1, characterized in that the recording layer is formed in an atmosphere of nitrogen of less than 0.3 mTorr.
Claim 6
Dependent Claim
43 words
A method of manufacturing an optical information recording medium according to claim 1, characterized in that there is formed a recording layer, which includes, as its main constituent, a member selected from the group consisting of a Te compound, In--Sb, In--Sb--Te, and In--Se.
Claim 7
Dependent Claim
53 words
A method of manufacturing an optical information recording medium according to claim 1, characterized in that a recording layer is formed, which includes Ge--Sb--Te as its main constituent, and wherein the ratio of the constituents is in a range represented by Ge x Sb y Te z , where 0.10≦x≦0.35, 0.10≦y, 0.45≦z≦0.65, x+y+z=1.
Claim 8
Independent Claim
110 words
A method of manufacturing an optical information recording medium which is provided on a substrate with a recording material capable of being able to be reversibly changed between an amorphous and a crystalline state by irradiation with a light beam, and a protection material having melting and softening temperatures higher than the melting temperature of the recording material, and which records, erases, or reproduces information by irradiation with a light beam, characterized in that the recording material and protection material are formed simultaneously, and the recording material is formed in a crystalline state by a scanning pulse laser upon a solid target confronting the substrate and without heat treatment initialization.
Claim 9
Independent Claim
110 words
A method of manufacturing an optical information recording medium which is provided on a substrate with a recording material capable of being able to be reversibly changed between an amorphous and a crystalline state by irradiation with a light beam, and a protection material having melting and softening temperatures higher than the melting temperature of the recording material, and which records, erases, or reproduces information by irradiation with a light beam, characterized in that the recording material and protection material are formed simultaneously, and the recording material is formed in a crystalline state by a scanning pulse laser upon a solid target confronting the substrate and without heat treatment initialization.
Claim 10
Dependent Claim
53 words
A method of manufacturing an optical information recording medium according to claim 7, characterized in that the recording material in the mixed recording layer of the recording and protection material, is formed, so as to be dispersed in the protection material as particles having a most predominant diameter of less than 50 nm.
Claim 11
Dependent Claim
42 words
A method of manufacturing an optical information recording medium according to claim 7, characterized in that there is formed a recording material including, as its main constituent, a member selected from the group consisting of a Te compound, In--Sb, In--Sb--Te, and In--Se.
Claim 12
Dependent Claim
53 words
A method of manufacturing an optical information recording medium according to claim 7, characterized in that there is formed a recording material, including Ge--Sb--Te as its main constituent, and wherein the ratio of the constituents is in the range represented by Ge x Sb y Te z , where 0.10≦x≦0.35, 0.10≦y, 0.45≦z≦0.65, x+y+z=1.
References Cited (Backward Citations)
SU646578A1
Cited
US4425570A
Cited
JPS57208648A
Cited
JPS5877042A
Cited
JPS60177446A
Cited
US4719594A
Cited
US5058061A
Cited
JPS6253886A
Cited
US4670345A
Cited
US4788561A
Cited
JPS6297885A
Cited
US4647944A
Cited
US4788097A
Cited
US4879205A
Cited
US4975355A
Cited
US5024910A
Cited
US5017277A
Cited
US5034255A
Cited
US5015492A
Cited
US5065697A
Cited
US5194363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-06 | 1998-09-05 | 1999-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-06 | 2002-09-05 | 2003-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-06 | 2006-09-05 | 2007-03-07 | $7700.00 | Window Closed / Lapsed |