Dynamic information storage or retrieval – Storage medium structure – Layered
Patent
1988-02-05
1989-11-07
Stephan, Steven L.
Dynamic information storage or retrieval
Storage medium structure
Layered
3461351, 369275, 430945, G11B 724
Patent
active
048797090
ABSTRACT:
An improvement is disclosed relating to optical data storage media having two thermo-optically active layers which absorb light at distinct wavelengths and expansion layer in which data appear as bulges formed upon the absorption of light, and a retention layer which fixes such bulges inplace until it is selectively heated to a rubbery state permitting relaxation of the expansion layer and the consequent disappearance of the bulges. In accordance with the improvement, the retention layer is modified so that it absorbs a controlled amount of light at the wavelength which is absorbed by the expansion layer, with the result that it absorbs light at both wavelengths rather than just one. Direct heating of both layers by light absorption during recordation, and accordingly a faster recordation response, are thus achieved.
REFERENCES:
patent: 4430659 (1984-02-01), Maffitt et al.
patent: 4719615 (1988-01-01), Feyrer et al.
J. S. Hartman et al., Erasable Bilayer Dye-Polymer Optical Recording Medium, pp. 155-158.
S. Miyaoka, Digital Audio is Compact and Rugged, IEEE Spectrum, Mar. 1984, pp. 35-39.
Stephan Steven L.
Tandy Corporation
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