Permanent memory structure with thermo-optical writing and optic

Details Permanent memory structure with thermo-optical writing and optic Permanent memory structure with thermo-optical writing and optic

1981-01-27

1982-11-23

Hecker, Stuart N.

Static information storage and retrieval

Information masking

Transparency

3461351, 369100, 369284, 365126, G11C 1304, G11B 724

Patent

active

043608957

ABSTRACT:
The invention relates to a permanent memory structure supported by a moving substrate.
This substrate is formed by two metal layers (9, 10) vacuum-deposited on the relatively inexpansible substrate (1). One of the two metal layers is very expansible (9), while the other layer (10) is relatively inexpansible, but ductile. During inscription by the laser beam, the beam energy absorbed by the layers (9, 10) produces an elongation of the expansible layer (9), which deforms the ductile layer (10) by stretching it beyond the elastic limit. There is a permanent deformation of the two-layer assembly, without perforation.
Particular application to optical disks.

REFERENCES:
patent: 3560994 (1971-02-01), Wolff et al.
patent: 4004080 (1977-01-01), Vossen et al.
patent: 4264986 (1981-04-01), Willis
patent: 4285056 (1981-08-01), Bell
patent: 4300227 (1981-11-01), Bell
Cuomo et al., "Digital Recording by Thin Film Spalling", IBM Tech. Disc. Bul., vol. 21, No. 2, 7/78, pp. 859-860.
Chemical Abstracts, vol. 73, No. 22, 11/30/70.

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