Patent EP0068801A2 successfully refreshed from Google Patents.
EP0068801A2
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Optical storage medium
Assignee: International Business Machines Corp
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Filing: 1982-06-22
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Granted: —
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Expires: 2002-06-22
Abstract
Abstract An optical recording medium includes a substrate (S3) carrying first and second adjacent thin layers (A. B) or different materials, which, upon marking with an energy beam, form a marked area having optical properties different from the optical properties of the unmarked area. The optical properties of the marked area has contrast sufficiently different from the opt- cal properties of the unmarked area so that the marked area can be reirably sensed The first thin layer comprises a metal and the second thin layer comprises a metal or a semiconductor selected from the group comprising germanium or sihcon.
Inventors
- 👤 King Ning Tu
- 👤 Kie Yeung Ahn
- 👤 Sigrid Renee Herd
- 👤 Michael Heino Lee
- 👤 Harold Wieder
- 👤 Aare Onton
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 14:15
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24308; G11B2007/2431; G11B2007/24312
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
54 words
An optical storage medium including first and second adjacent layers (A, B) of different materials which, upon marking with an energy beam, form a marked area having optical properties different from the optical properties of the unmarked areas, said first layer comprising a metal, and said second layer comprising a metal or a semiconductor.
Claim 2
Dependent Claim
54 words
An optical storage medium including first and second adjacent layers (A, B) of different materials which, upon marking with an energy beam, form a marked area having optical properties different from the optical properties of the unmarked areas, said first layer comprising a metal, and said second layer comprising a metal or a semiconductor.
Claim 3
Dependent Claim
12 words
A medium according to claim 1, in which the semiconductor is silicon.
Claim 4
Dependent Claim
18 words
A medium according to claim 2, in which the metal of the first layer is a transition metal.
Claim 5
Dependent Claim
37 words
A medium according to claim 2, in which the metal of the first layer is selected from the group consisting cf the group VB, VIB, VIIB and VII elements on the periodic chart, plus Mg and Au.
Claim 6
Dependent Claim
36 words
A medium according to claim 2, in which the metal of the first layer is selected from the group consisting of V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Rh, Ni, Pd, Pt and Au.
Claim 7
Dependent Claim
29 words
A medium according to claim 2, in which the metal of the first layer is selected from the group consisting of Pd, Pt, Cr, Ta, Rh, V and Co.
Claim 8
Dependent Claim
39 words
A medium according to claim 2, in which the metal of the first layer can be locally combined or reacted with silicon by local heating to produce a silicide which is an optically distinguishable mark and which is stable.
Claim 9
Dependent Claim
21 words
A medium according to claim 7, in which the material is not normally combinable or reactable with silicon without local heating.
Claim 10
Dependent Claim
17 words
A medium according to claim 7 or 8, in which the local heating is applicable by laser.
Claim 11
Dependent Claim
35 words
An optical storage medium according to claim 1, in which said metals are selected from the group comprising Al, Au, Pb and Sn and said semiconductors are selected from the group comprising Ge and Si.
Claim 12
Dependent Claim
32 words
An optical storage medium according to claim 1, in which said materials, upon marking with the energy beam, endothermically form the marked area which comprises an alloy or mixture of said materials.
Claim 13
Dependent Claim
46 words
An optical storage medium according to claim 1, in which the material of said first layer is selected from the group comprising Al, Au, Pb, Sn and the material of said second layer is selected from the group comprising Al, Au, Pb, Sn, Ge and Si.
Claim 14
Independent Claim
71 words
A method of recording data for subsequent optical readout, in which an energy beam is used to apply local heating to first and second adjacent layers, one of which layers is of metal and the other of which layers is of metal or semiconductor which can be locally combined or reacted with the metal of the first layer by local heating, to produce an optically distinguishable mark and which is stable.
Claim 15
Independent Claim
71 words
A method of recording data for subsequent optical readout, in which an energy beam is used to apply local heating to first and second adjacent layers, one of which layers is of metal and the other of which layers is of metal or semiconductor which can be locally combined or reacted with the metal of the first layer by local heating, to produce an optically distinguishable mark and which is stable.
Claim 16
Dependent Claim
35 words
A method according to claim 13, in which the metal of the first layer and the metal or semiccnductor of the second layer are endothermically reacted or combined together to form the optically distinguishable mark.
References Cited (Backward Citations)
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