US5024910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical information recording medium
Assignee: Panasonic Holdings Corp
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Filing: 1988-09-16
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Granted: 1991-06-18
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Expires: 2008-09-16
Abstract
Abstract This invention provides an optical information recording medium whose recording thin film is made of three components of GeTe, Sb 2 Te 3 and Sb derived from a GeTe alloy, an Sb 2 Te 3 alloy and excess Sb and which is capable of recording, reproduction and erasure. By this, optical disk files which have a stable cycle characteristic and are practically useful can be realized.
Inventors
- 👤 Takeo Ohta
- 👤 Masami Uchida
- 👤 Koichi Kotera
- 👤 Kunihiro Matsubara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:05
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B7/2433; G11B7/004; G11B7/0055; G11B7/00557; G11B2007/24302; G11B2007/24312; G11B2007/24314; G11B2007/24316; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/165
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
An erasable optical information recording medium characterized in that a recording thin film made of three components of a GeTe alloy, an Sb 2 Te 3 alloy and excess Sb is selected such that 10 mole %<excess Sb<30% mole %, is formed on a substrate, said recording thin film having the capability of being heated, melted by irradiation of a laser beam and being converted into amorphization by quenching and having the capability of crystallization by heating the thin film in the amorphous state by irradiation of a laser beam.
Claim 2
Dependent Claim
90 words
An erasable optical information recording medium characterized in that a recording thin film made of three components of a GeTe alloy, an Sb 2 Te 3 alloy and excess Sb is selected such that 10 mole %<excess Sb<30% mole %, is formed on a substrate, said recording thin film having the capability of being heated, melted by irradiation of a laser beam and being converted into amorphization by quenching and having the capability of crystallization by heating the thin film in the amorphous state by irradiation of a laser beam.
Claim 3
Dependent Claim
41 words
An optical information recording medium according to claim 1, characterized in that the amount of the excess Sb in the three components of GeTe, Sb 2 Te 3 and excess Sb is selected such that 10 mole %<excess Sb<30 mole %.
Claim 4
Dependent Claim
46 words
An optical information recording medium according to claim 2, characterized in that the ratio of the excess Sb and the Sb 2 Te 3 in the GeTe, Sb 2 Te 3 and excess Sb is selected such that 0.3<b<0.8 (wherein b=excess Sb/Sb 2 Te 3 ).
Claim 5
Dependent Claim
42 words
An optical information recording medium according to claim 2 characterized in that the ratio of GeTe and Sb 2 Te 3 in the GeTe, Sb 2 Te 3 and excess Sb is selected such that 0.5<g<2.0 (wherein g=GeTe/Sb 2 Te 3 ).
Claim 6
Dependent Claim
62 words
An optical information recording medium according to claim 1, characterized in that said medium comprises the substrate having a dielectric layer formed thereon, the recording thin film consisting of the GeTe, Sb 2 Te 3 and excess Sb and formed on the dielectric layer, a dielectric layer formed on the thin film, and a reflection layer formed on the second-mentioned dielectric layer.
Claim 7
Dependent Claim
42 words
An optical information recording medium according to claim 3, characterized in that the ratio of GeTe and Sb 2 Te 3 in the GeTe, Sb 2 Te 3 and excess Sb is selected such that 0.5<g<2.0 (wherein g=GeTe/Sb 2 Te 3 ).
References Cited (Backward Citations)
JPS53141040A
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US4499178A
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JPS6189889A
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US4670345A
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JPS62196181A
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JPS62209742A
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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) | 1994-06-17 | 1994-12-17 | 1995-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-17 | 1998-12-17 | 1999-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-17 | 2002-12-17 | 2003-06-18 | $7700.00 | Window Closed / Lapsed |