EP0142968A2
Expired / Lapsed
EP
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Optical recording medium and method of producing same
Assignee: Panasonic Holdings Corp
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Filing: 1984-11-09
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Granted: —
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Expires: 2004-11-09
Abstract
Abstract An optical recording medium which comprises a recording layer comprising oxygen, tellurium, and germanium and/or tin, in which the proportion of oxygen is from 20 to 60 atom % and the relative proportions of Te, Ge and Sn lie within the polygon ABCDEF shown in Figure 2 of the accompanying drawings.
Inventors
- 👤 Kunio Kimura
- 👤 Noboru Yamada
- 👤 Kenichi Nishiuchi
- 👤 Mutsuo Takenaga
- 👤 Eiji Ohno
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 19:17
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B7/2433; G11B7/26; G11B7/266; G11B2007/24302; G11B2007/24312; G11B2007/24316; G11B2007/24318; G11B2007/2432; G11B7/004; G11B7/0045; G11B7/00454; G11B7/252; G11B7/253; G11B7/2533; G11B7/257
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
51 words
An optical recording medium which comprises a recording layer comprising oxygen, tellurium, and germanium and/or tin, in which the proportion of oxygen is from 20 to 60 atom % and the relative proportions of Te, Ge and Sn lie within the polygon ABCDEF shown in Figure 2 of the accompanying drawings.
Claim 2
Dependent Claim
51 words
An optical recording medium which comprises a recording layer comprising oxygen, tellurium, and germanium and/or tin, in which the proportion of oxygen is from 20 to 60 atom % and the relative proportions of Te, Ge and Sn lie within the polygon ABCDEF shown in Figure 2 of the accompanying drawings.
Claim 3
Dependent Claim
31 words
An optical recording medium according to claim 1, in which the relative proportions of Te, Ge and Sn lie within the polygon GHIJKLMN shown in Figure 2 of the accompanying drawings.
Claim 4
Dependent Claim
23 words
An optical recording medium according to claim 1 or 2, in which the proportion of oxygen is from 30 to 50 atom %.
Claim 5
Dependent Claim
25 words
An optical recording medium according to any of claims 1 to 3, in which the thickness of recording layer is from 500 to 2,000 Å.
Claim 6
Dependent Claim
40 words
An optical recording medium according to any of claims 1 to 4, in which humidity resistant layers that are transparent to light having a wavelength of from 400 to 1,000 nm are provided on both surfaces of the recording layer.
Claim 7
Dependent Claim
20 words
An optical recording medium according to claim 5, in which the transparent humidity resistant layers are formed of silicon dioxide.
Claim 8
Independent Claim
77 words
A method of making an optical recording medium comprising a recording layer comprising oxygen, tellurium, germanium and tin, which method comprises sintering a mixture containing tellurium, germanium, and tin, at least one of which metals is present in the form of an oxide thereof, aluminium and, as a solid solution stabiliser, at least one of copper, zinc, iron and nickel, and the coating of a substrate by evaporative deposition using the sintered product as the deposition source.
Claim 9
Independent Claim
77 words
A method of making an optical recording medium comprising a recording layer comprising oxygen, tellurium, germanium and tin, which method comprises sintering a mixture containing tellurium, germanium, and tin, at least one of which metals is present in the form of an oxide thereof, aluminium and, as a solid solution stabiliser, at least one of copper, zinc, iron and nickel, and the coating of a substrate by evaporative deposition using the sintered product as the deposition source.
Claim 10
Dependent Claim
18 words
A method according to claim 7, in which the oxide is tellurium dioxide, germanium oxide, or tin oxide.
Claim 11
Dependent Claim
23 words
A method according to claim 7 or 8, in which the mixture contains 5 to 50% by weight of the solid solution stabiliser.
Claim 12
Dependent Claim
25 words
_A method according to any of claims 7 to 9, in which the mixture contains 10 to 40% by weight of the solid solution stabiliser.
Claim 13
Independent Claim
40 words
A method according to any of claims 7 to 10, in which the weight ratio of the sum of the germanium or oxide thereof and the tin or oxide thereof to aluminium, in the mixture, is from 3 to 20.
Claim 14
Independent Claim
44 words
A method according to any of claims 7 to 11, in which the weight ratio of the tellurium or oxide thereof to the sum of the germanium or oxide thereof and the tin or oxide thereof, in the mixture, is from 0.5 to 2.
Claim 15
Independent Claim
24 words
A method according to any of claims 7 to 12, in which the mixture is sintered at a temperature of from 600° to 720°C.
Claim 16
Independent Claim
28 words
A method according to any of claims 7 to 13, in which the evaporative deposition of the sintered product is effected by resistive heating or electron beam deposition.
References Cited (Backward Citations)
No citation records indexed.
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