Dye-polymer optical data storage media with improved recording s

Details Dye-polymer optical data storage media with improved recording s Dye-polymer optical data storage media with improved recording s

1989-08-25

1992-02-11

Levy, Stuart S.

Dynamic information storage or retrieval

Storage medium structure

Layered

369286, 369288, 3692754, 3461351, G11B 724

Patent

active

050880888

ABSTRACT:
An improvement is disclosed relating to optical data storage media having two thermo-optically active layers which absorb light at distinct wavelengths--an expansion layer in which data appear as bulges formed upon the absorption of light, and a retention layer which fixes such bulges in place 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.

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Watkinson, The Art of Digital Audio, Chapter 13, pp. 440-486, Focal Press, 1988.
Hartman et al., "Erasable Bilayer Dye-Polymer Optical Recording Medium", pp. 155-158.
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