US4670345A
Expired / Lapsed
US
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Information recording medium
Assignee: Asahi Kasei Microdevices Corp
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Filing: 1986-02-21
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Granted: 1987-06-02
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Expires: 2006-02-21
Abstract
Abstract An information recording medium comprising a substrate and superimposed thereon a recording layer composed of Sb, Te and Ge has been found to be advantageously employed, because of its high thermal stability as well as high sensitivity and high S/N ratio, in a system of recording information by exposing an energy beam to a recording medium to cause the exposed areas to be different in optical extinction coefficient from the non-exposed areas.
Inventors
- 👤 Isao Morimoto
- 👤 Kazuyoshi Itagaki
- 👤 Koichi Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:26
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/258; G11B7/242; G11B7/243; G11B7/257; G11B2007/24302; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/25705; G11B2007/2571; G11B2007/25713; G11B2007/25715; G11B7/004; G11B7/0045; G11B7/00454; G11B7/253; G11B7/2531; G11B7/2533; G11B7/2534; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/31504
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
76 words
An information recording medium, for use in a system of recording information by exposing a medium to an energy beam, said medium comprising a substance capable of changing in optical extinction coefficient upon being heated, causing the exposed areas to be different in optical extinction coefficient from the non exposed areas without ablation of the medium, wherein said information recording medium comprises a substrate and superimposed thereon a recording layer composed of Sb, Te and Ge.
Claim 2
Dependent Claim
76 words
An information recording medium, for use in a system of recording information by exposing a medium to an energy beam, said medium comprising a substance capable of changing in optical extinction coefficient upon being heated, causing the exposed areas to be different in optical extinction coefficient from the non exposed areas without ablation of the medium, wherein said information recording medium comprises a substrate and superimposed thereon a recording layer composed of Sb, Te and Ge.
Claim 3
Dependent Claim
39 words
An information recording medium according to claim 1, wherein Sb, Te and Ge are present in said recording layer in a composition in terms of number of atoms represented by the formula: (Sb.sub.X Te.sub.1-X).sub.Y Ge.sub.1-Y wherein 0.05≦x≦0.7 and 0.4≦Y≦0.8.
Claim 4
Dependent Claim
39 words
An information recording medium according to claim 1, wherein Sb, Te and Ge are present in said recording layer in a composition in terms of number of atoms represented by the formula: (Sb.sub.X Te.sub.1-X).sub.Y Ge.sub.1-Y wherein 0.1≦x≦0.6 and 0.4≦Y≦0.8.
Claim 5
Dependent Claim
39 words
An information recording medium according to claim 1, wherein Sb, Te and Ge are present in said recording layer in a composition in terms of number of atoms represented by the formula: (Sb.sub.X Te.sub.1-X).sub.Y Ge.sub.1-Y wherein 0.1≦x≦0.6 and 0.5≦Y≦0.7.
Claim 6
Dependent Claim
39 words
An information recording medium according to claim 1, wherein Sb, Te and Ge are present in said recording layer in a composition in terms of number of atoms represented by the formula: (Sb.sub.X Te.sub.1-X).sub.Y Ge.sub.1-Y wherein 0.15≦x≦0.4 and 0.5≦Y≦0.7.
Claim 7
Dependent Claim
39 words
An information recording medium according to claim 1, wherein Sb, Te and Ge are present in said recording layer in a composition in terms of number of atoms represented by the formula: (Sb.sub.X Te.sub.1-X).sub.Y Ge.sub.1-Y wherein 0.1≦x≦0.35 and 0.5≦Y≦0.7.
Claim 8
Dependent Claim
52 words
An information recording medium according to claim 1, which further comprises a reflective layer of a metal or an alloy composed of at least two metals provided on one of the upper and lower sides of said recording layer, 68 said recording layer and said reflective layer constituting an information supporting layer.
Claim 9
Dependent Claim
41 words
An information recording medium according to claim 7, wherein said reflective layer is a layer of a metal selected from group consisting of Al, Ti, Cr, Co, Ni, Se, Ge, Zr, Ag, In, Sn, Sb, Te, Pt, Au, Pb and Bi.
Claim 10
Dependent Claim
27 words
An information recording medium according to claim 7, said reflective layer is a layer of a metal selected from the group consisting of Sb, Te and Bi.
Claim 11
Dependent Claim
47 words
An information recording medium according to claim 7, wherein said reflective layer is a layer of an alloy containing at least one metal selected from the group consisting of Al, Ti, Cr, Co, Ni, Se, Ge, Zr, Ag, In, Sn, Sb, Te, Pt, Au, Pb and Bi.
Claim 12
Dependent Claim
30 words
An information recording medium according to claim 7, wherein said reflective layer is an alloy containing at least one metal selected from the group consisting of Sb, Te and Bi.
Claim 13
Dependent Claim
32 words
An information recording medium according to claim 1, which further comprises a layer of a metallic compound provided on at least one of the upper and lower sides of said recording layer.
Claim 14
Dependent Claim
33 words
An information recording medium according to claim 7, which further comprises a layer of a metallic compound provided on at least one of the upper and lower sides of said information supporting layer.
Claim 15
Dependent Claim
47 words
An information recording medium according to claim 12, wherein said metallic compound is at least one member selected from the group consisting of oxides and nitrides of a metal selected from Al, Cr, Si, Zr, Ti, Ge, Se, Te, V, Hf, La, Sm, Y, Ta and Mo.
Claim 16
Dependent Claim
28 words
An information recording medium according to claim 12, wherein said metallic compound is at least one member selected from the group consisting of oxides and nitrides of Si.
Claim 17
Dependent Claim
47 words
An information recording medium according to claim 13, wherein said metallic compound is at least one member selected from the group consisting of oxides and nitrides of a metal selected from Al, Cr, Si, Zr, Ti, Ge, Se, Te, V, Hf, La, Sm, Y, Ta and Mo.
Claim 18
Dependent Claim
28 words
An information recording medium according to claim 13, wherein said metallic compound is at least one member selected from the group consisting of oxides and nitrides of Si.
Claim 19
Dependent Claim
21 words
An information recording medium according to claim 1, wherein said recording layer has a thickness of 800 Å to 2,000 Å.
Claim 20
Dependent Claim
21 words
An information recording medium according to claim 7, wherein said recording layer has a thickness of 200 Å to 1,000 Å.
Claim 21
Dependent Claim
21 words
An information recording medium according to claim 7, wherein said reflective layer has a thickness of 100 Å to 1,000 Å.
Claim 22
Dependent Claim
18 words
An information recording medium according to claim 1, which has been subjected to heat treatment under humid condition.
Claim 23
Dependent Claim
31 words
An information recording medium according to claim 21, wherein said heat treatment is effected at 40° C. to 100° C. in an atmosphere with a relative humidity of 50% to 98%.
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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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |