US5095479A
Expired / Lapsed
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Optical information recording medium
Assignee: Ricoh Co Ltd
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Filing: 1991-08-12
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Granted: 1992-03-10
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Expires: 2011-08-12
Abstract
Abstract An optical information recording medium is composed of a substrate and a recording layer, formed thereon, which recording layer causes the reversible phase change by the application of an electromagnetic wave thereto, and comprises a phase-changeable type alloy with the composition of (XYZ 2 ) 1-x M x , wherein X is an element of the group Ib, Y is an element of the group Va, Z is an element of the group VIa, M is an element selected from the group consisting of Sb, Bi, In, Al and Ga, and 0<x<1.
Inventors
- 👤 Makoto Harigaya
- 👤 Yukio Ide
- 👤 Yoshiyuki Kageyama
- 👤 Hiroko Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:39
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B7/004; G11B7/0055; G11B7/00557; G11B2007/24302; G11B2007/2431; G11B2007/24314; G11B7/252; G11B7/253; G11B7/2533; G11B7/2534; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
An optical information recording medium comprising a substrate and a recording layer formed on said substrate whose phase is reversibly changeable under application of electromagnetic waves thereto, said recording layer comprising a phase-changeable type alloy with the composition of (XYZ 2 ) 1-x M x , wherein X is one element selected from the elements of group Ib of the periodic table, Y is one element selected from the elements of group Va of the periodic table, Z is one element selected from the elements of group VIa of the periodic table, M is one element selected from the group consisting of Sb, Bi, In, Al and Ga, and 0<×<1.
Claim 2
Dependent Claim
110 words
An optical information recording medium comprising a substrate and a recording layer formed on said substrate whose phase is reversibly changeable under application of electromagnetic waves thereto, said recording layer comprising a phase-changeable type alloy with the composition of (XYZ 2 ) 1-x M x , wherein X is one element selected from the elements of group Ib of the periodic table, Y is one element selected from the elements of group Va of the periodic table, Z is one element selected from the elements of group VIa of the periodic table, M is one element selected from the group consisting of Sb, Bi, In, Al and Ga, and 0<×<1.
Claim 3
Dependent Claim
41 words
The optical information recording medium as claimed in claim 1, wherein said recording layer comprises a phase-changeable type alloy with the composition of (XYZ 2 ) 1-x M x , wherein M is an element of Sb or Bi, and 0.35≦×≦0.95.
Claim 4
Dependent Claim
22 words
The optical information recording medium as claimed in claim 2, wherein said composition of (XYZ 2 ) 1-x M x , 0.5≦×≦0.9.
Claim 5
Dependent Claim
123 words
The optical information recording medium as claimed in claim 2, wherein said phase-changeable type alloy with the composition of (XYZ 2 ) 1-x M x is selected from the group consisting of (AgSbTe 2 ) 1-x Sb x , (AgSbSe 2 ) 1-x Sb x , (CuSbTe 2 ) 1-x Sb x , (CuSbSe 2 ) 1-x Sb x , (AgBiTe 2 ) 1-x Sb x , (AgBiSe 2 ) 1-x Sb x , (CuBiTe 2 ) 1-x Sb x , (CuBiSe 2 ) 1-x Sb x , (AgSbTe 2 ) 1-x Bi x , (AgSbSe 2 ) 1-x Bi x , (CuSbTe 2 ) 1-x Bi x , (AgBiTe 2 ) 1-x Bi x and (CuBiTe 2 ) 1-x Bi x .
Claim 6
Dependent Claim
42 words
The optical information recording medium as claimed in claim 1, wherein said recording layer comprises a phase-changeable type alloy with the composition of (XYZ 2 ) 1-x M x , wherein M is an element of In, Al or Ga, and 0.1≦×≦0.8.
Claim 7
Dependent Claim
22 words
The optical information recording medium as claimed in claim 5, wherein said composition of (XYZ 2 ) 1-x M x , 0.15≦×≦0.65.
Claim 8
Dependent Claim
158 words
The optical information recording medium as claimed in claim 5, wherein said phase-changeable type allow with the composition of (XYZ 2 ) 1-x M x is selected from the group consisting of (AgSbTe 2 ) 1-x In x , (AgSbSe 2 ) 1-x In x , (AgSbTe 2 ) 1-x Ga x , (AgSbSe 2 ) 1-x Ga x , (AgSbTe 2 ) 1-x Al x , (AgSbSe 2 ) 1-x Al x , (AgBiTe 2 ) 1-x In x , (AgBiSe 1 ) 1-x In x , (AgBiTe 2 ) 1-x Ga x , (AgBiSe 2 ) 1-x Ga x , (AgBiTe 1 ) 1-x Al x , (AgBiSe 2 ) 1-x Al x , (CuSbTe 2 ) 1-x In x , (CuSbTe 2 ) 1-x Ga x , (CuSbTe 2 ) 1-x Al x , (CuBiTe 2 ) 1-x In x , (CuBiTe 2 ) 1-x Ga x and (CuBiTe 2 ) 1-x Al x .
Claim 9
Dependent Claim
25 words
The optical information recording medium as claimed in claim 1, wherein said recording layer has a ( thickness ranging from 100 Å to 2000 Å.
Claim 10
Dependent Claim
32 words
The optical information recording medium as claimed in claim 1, further comprising a protective layer interposed between said substrate and said recording layer, and a protective layer superposed on said recording layer.
Claim 11
Dependent Claim
24 words
The optical information recording medium as claimed in claim 9, wherein said protective layer has a thickness ranging from 300 Å to 3000 Å.
References Cited (Backward Citations)
US3530441A
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JPS61219692A
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JPS61270190A
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JPS6219490A
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JPS6273438A
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JPH01104766A
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JPH0264929A
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JPH0264930A
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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) | 1995-03-10 | 1995-09-09 | 1996-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-10 | 1999-09-09 | 2000-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-10 | 2003-09-09 | 2004-03-10 | $7700.00 | Window Closed / Lapsed |