EP0212336A1
Expired / Lapsed
EP
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A method of optical recording
Assignee: International Business Machines Corp
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Filing: 1986-07-25
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Granted: —
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Expires: 2006-07-25
Abstract
Abstract A method of optical recording uses a film of a material which has a crystallisation temperature between 100°C and 400°C and can be switched between the amorphous and the crystalline states. Both the amorphous and crystalline states are substantially a single phase where the stoichiometric ratio of the material remains unchanged. A spot on the film is heated with a laser beam with a controlled pulse duration and intensity to melt the material in the spot. When the laser irradiation is stopped, the material in that spot is quenched at a rate that produces the desired state, that is, either to the crystalline or the amorphous state.
Inventors
- 👤 Roger Westwood Barton
- 👤 Martin Yu-Wen Chen
- 👤 Charles Raymond Davis
- 👤 Grace Su Lim
- 👤 Vincent Nmn Marrello
- 👤 Kurt Allan Rubin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 16:44
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/0045; G11B7/00454; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B7/252; G11B7/253; G11B7/2533; G11B7/254; G11B7/2548; G11B7/257
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A method of optical recording comprising the steps of (1) depositing a film of a material which has a crystallisation temperature between 100°C and 400°C and which can be switched between the amorphous and the crystalline states where both states are substantially of a single phase with the same stoichiometric ratio, said amorphous state and said crystalline state having different optical properties, and (2) heating a spot in said film with a laser beam with controlled pulse duration and intensity to melt the material in said spot, whereby cessation of the laser radiation causes the material in said spot to quench at a suitable rate to produce the desired state.
Claim 2
Independent Claim
110 words
A method of optical recording comprising the steps of (1) depositing a film of a material which has a crystallisation temperature between 100°C and 400°C and which can be switched between the amorphous and the crystalline states where both states are substantially of a single phase with the same stoichiometric ratio, said amorphous state and said crystalline state having different optical properties, and (2) heating a spot in said film with a laser beam with controlled pulse duration and intensity to melt the material in said spot, whereby cessation of the laser radiation causes the material in said spot to quench at a suitable rate to produce the desired state.
Claim 3
Dependent Claim
12 words
A method as claimed in claim 1, wherein the material is (TeGe)₈₅Sn₁₅.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1, wherein the material is (TeGe) 1-x Sn x , where x is from 0.1 to 0.25.
Claim 5
Dependent Claim
12 words
A process as claimed in claim 1, wherein the material is GeTe.
Claim 6
Dependent Claim
12 words
A process as claimed in claim 1, wherein the material is Sb₂Se.
Claim 7
Dependent Claim
23 words
A process as claimed in claim 1 wherein the material is Sb 100-x Se x , where x is between 0 and 40.
Claim 8
Dependent Claim
23 words
A process as claimed in claim 1, wherein the material is (InSb) 100-x Ge x , where x is between 0 and 10.
Claim 9
Dependent Claim
23 words
A process as claimed in claim 1, wherein the material is (Ga 100-x In x )₅₀Sb₅₀, where x is between 0 and 100.
Claim 10
Dependent Claim
18 words
A process as claimed in any preceding claim, wherein the film is about 20 to 100 nm thick.
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