Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1987-08-28
1988-11-22
Cardillo, Raymond F.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369275, 369288, 369284, 365113, 430945, G11C 1302, G11B 724
Patent
active
047870770
ABSTRACT:
An optical storage system has an information containing film of a material which has a crystallization temperature between 100.degree. C. and 400.degree. 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. Spots on the film is heated with a circular laser beam with a controlled pulse duration and intensity to melt the material in the spots. The spots are quenched at one rate to produce the amorphous state, and in a second revolution of the disk, at a different rate to produce the crystalline state.
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Barton Roger W.
Chen Martin Y.
Davis Charles R.
Gorman Grace L.
Marrello Vincent
Cardillo Raymond F.
International Business Machines - Corporation
Nguyen Hoa T.
Walsh Joseph G.
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