EP0050047A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Information recording member and method of fabricating the same
Assignee: Hitachi Ltd
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Filing: 1981-10-14
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Granted: —
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Expires: 2001-10-14
Abstract
Abstract An information recording member (1) comprising a substrate (6), and a thin film (5) formed on the substrate with or without an intermediate layer therebetween and irradiated with a recording beam (4) to make an aperture or recess in the thin film is disclosed in which the thin film is a crystalline film and has a composition expressed by a general formula Se x Te y M z , where x, y and z are given by formulae 0.02 ≤ x ≤ 0.35, 0.50 ≤ y ≤ 0.98 and 0 ≤ z ≤ 0.45, respectively, and M indicates at least one element selected from the group consisting of As, Sb, Bi, S, Si, Ge, Sn, Pb, AI, Ga, In, Tl, Zn, Cd, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W and Ta, and in which the thin film does not deteriorate to such an extent as seen in conventional recording films when a time has elapsed, since the thin film is crystalline.
Inventors
- 👤 Motoyasu Terao
- 👤 Shinkichi Horigome
- 👤 Munehisa Mitsuya
- 👤 Sakae Ota
- 👤 Kazuo Shigematsu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 21:45
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24304; G11B2007/24306; G11B2007/24308; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B7/252; G11B7/253; G11B7/2531; G11B7/2532; G11B7/2533; G11B7/257; G11B7/2578
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
139 words
An information recording member comprising: a substrate (6, 7, 24); and a thin film (5, 23, 25) formed on said substrate with or without an intermediate layer therebetween, said thin film being irradiated with a recording beam (4) to make an aperture or recess in said thin film, said thin film being a thin crystalline film, said thin crystalline film having a composition expressed by a general formula Se x Te y M z , where x, y and z are given by formulae 0.02 < x < 0.35, 0.50 < y < 0.98 and 0 < z < 0.45, respectively, and M indicates at least one element selected from the group consisting of As, Sb, Bi, S, Si, Ge, Sn, Pb, Al, Ga, In, Tl, Zn, Cd, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W, and Ta.
Claim 2
Dependent Claim
139 words
An information recording member comprising: a substrate (6, 7, 24); and a thin film (5, 23, 25) formed on said substrate with or without an intermediate layer therebetween, said thin film being irradiated with a recording beam (4) to make an aperture or recess in said thin film, said thin film being a thin crystalline film, said thin crystalline film having a composition expressed by a general formula Se x Te y M z , where x, y and z are given by formulae 0.02 < x < 0.35, 0.50 < y < 0.98 and 0 < z < 0.45, respectively, and M indicates at least one element selected from the group consisting of As, Sb, Bi, S, Si, Ge, Sn, Pb, Al, Ga, In, Tl, Zn, Cd, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W, and Ta.
Claim 3
Dependent Claim
21 words
An information recording member according to Claim 1, wherein said x is given by a formula 0.05 < x < 0.25.
Claim 4
Dependent Claim
15 words
An information recording member according to Claim 1, wherein said z is equal to zero.
Claim 5
Dependent Claim
31 words
An information recording member according to Claim 1, wherein said M appearing in said general formula indicates at least one element selected from the group consisting of In, Pb an Sn.
Claim 6
Dependent Claim
21 words
An information recording member according to Claim 4, wherein said z is given by a formula 0.01 < z < 0.30.
Claim 7
Dependent Claim
30 words
An information recording member according to Claim 1, wherein said M appearing in said general formula indicates at least one element selected from the group consisting of Sb and Bi.
Claim 8
Dependent Claim
21 words
An information recording member according to Claim 6, wherein said z is given by a formula 0.01 < z < 0.30.
Claim 9
Dependent Claim
18 words
An information recording member according to Claim 1, wherein said M appearing in said general formula indicates arsenic.
Claim 10
Dependent Claim
21 words
An information recording member according to Claim 8, wherein said z is given by a formula 0.001 < z < 0.35.
Claim 11
Dependent Claim
30 words
An information recording member according to Claim 1, wherein said M appearing in said general formula indicates at least one element selected from the group consisting of Si and Ge.
Claim 12
Dependent Claim
21 words
An information recording member according to Claim 10, wherein said z is given by a formula 0.01 < z < 0.05.
Claim 13
Dependent Claim
31 words
An information recording member according to Claim 1, wherein said M appearing in said general formula indicates at elast one element selected from the group consisting of Ga, Zn and Cd.
Claim 14
Dependent Claim
21 words
An information recording member according to Claim 12, wherein said z is given by a formula 0.01 < z < 0.30.
Claim 15
Dependent Claim
39 words
An information recording member according to Claim 1, wherein said M appearing in said general formula indicates at least one element selected from the group consisting of Al, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W and Ta.
Claim 16
Dependent Claim
21 words
An information recording member according to Claim 14, wherein said z is given by a formula 0.01 < z < 0.15.
Claim 17
Dependent Claim
18 words
An information recording member according to Claim 1, wherein said M appearing in said general formula indicates sulphur.
Claim 18
Dependent Claim
21 words
An information recording member according to Claim 16, wherein said z is given by a formula 0.01 < z < 0.15.
Claim 19
Dependent Claim
17 words
An information recording member according to Claim 1, wherein said M appearing in-said general formula indicates thallium.
Claim 20
Dependent Claim
21 words
An information recording member according to Claim 18, wherein said z is given by a formula 0.01 < z < 0.10.
Claim 21
Dependent Claim
25 words
An information recording member according to any one of Claims 1 to 19, wherein said thin film has a thickness of 30 to 600 A.
Claim 22
Dependent Claim
21 words
An information recording member according to Claim 20, wherein said thin film has a thickness of 250 o to 600 A.
Claim 23
Dependent Claim
23 words
An information recording member according to any one of Claims 1 to 19, wherein a protection film is formed on said thin film.
Claim 24
Dependent Claim
21 words
An information recording member according to Claim 22, wherein said thin film has a thickness of 30 0 to 250 A.
Claim 25
Dependent Claim
26 words
An information recording member according to any one of Claims 1 to 19, wherein an intermediate layer is provided between said thin film and said substrate.
Claim 26
Dependent Claim
19 words
An information recording member according to Claim 24, wherein said intermediate layer contains Bi as the main component thereof.
Claim 27
Dependent Claim
25 words
An information recording member according to Claim 25, wherein said intermediate layer contains Se or Sb, in addition to Bi acting as said main component.
Claim 28
Dependent Claim
31 words
An information recording member according to Claim 26, wherein the concentration of Se or Sb in said intermediate layer is increased toward an interface between said intermediate layer and said substrate.
Claim 29
Dependent Claim
30 words
An information recording member according to Claim 26, wherein an average concentration of Se or Sb in said intermediate layer lies in a range from 2 to 35 atomic percent.
Claim 30
Independent Claim
25 words
A method of fabricating an information recording member, comprising a step of heating an information recording member including a substrate (7) and a thin film
Claim 31
Independent Claim
25 words
A method of fabricating an information recording member, comprising a step of heating an information recording member including a substrate (7) and a thin film
Claim 32
Dependent Claim
122 words
(23) to crystallize said thin film, said thin film being formed on said substrate with or without an intermediate layer therebetween, said thin film being irradiated with a recording beam to make an aperture or recess in said thin film, said thin film having a composition expressed by a general formula Se x Te y M z , where x, v and z are given by formulae 0.02 < x < 0.35, 0.50 < y < 0.98 and 0 < z < 0.45, respectively, and M indicates at least one element selected from the group consisting of As, Sb, Bi, S, Si, Ge, Sn, Pb, Al, Ga, In, Tl, Zn, Cd, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W and Ta.
Claim 33
Dependent Claim
122 words
(23) to crystallize said thin film, said thin film being formed on said substrate with or without an intermediate layer therebetween, said thin film being irradiated with a recording beam to make an aperture or recess in said thin film, said thin film having a composition expressed by a general formula Se x Te y M z , where x, v and z are given by formulae 0.02 < x < 0.35, 0.50 < y < 0.98 and 0 < z < 0.45, respectively, and M indicates at least one element selected from the group consisting of As, Sb, Bi, S, Si, Ge, Sn, Pb, Al, Ga, In, Tl, Zn, Cd, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W and Ta.
Claim 34
Dependent Claim
23 words
A method of fabricating an information recording member according to Claim 29, wherein said thin film is formed by the vacuum evaporation method.
Claim 35
Dependent Claim
24 words
A method of fabricating an information recording member according to Claim 29, wherein said thin film has a thickness of 30 to 600 A.
Claim 36
Independent Claim
35 words
A method of fabricating an information recording member according to any one of Claims 29 to 31, wherein said information recording member is heated at a temperature of 40 to 70°C in said heating step.
References Cited (Backward Citations)
No citation records indexed.
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