Optical memory element

Radiation imagery chemistry: process – composition – or product th – Imaged product – Nonsilver image

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430321, 430323, 430325, 430272, 156643, 1566591, 156663, 428167, 428156, 501 66, 501 52, 501 61, 501 62, 3461351, 346134, 369279, G03C 516, G01D 900, G11B 370

Patent

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048186481

ABSTRACT:
An optical memory element comprising a substrate with grooves functioning as grooves for, for example, controlling the position of a laser beam, wherein said substrate is composed of a glass containing SiO.sub.2 in the range of 51 to 71% by weight, Na.sub.2 O in the range of 10 to 18% by weight, K.sub.2 O in the range of 0 to 8% by weight, Al.sub.2 O.sub.3 in the range of 12 to 22% by weight, and B.sub.2 O.sub.3 in the range of 0 to 9% by weight.

REFERENCES:
patent: 4015045 (1977-03-01), Rinehart
patent: 4544443 (1985-10-01), Ohta
patent: 4655876 (1987-04-01), Kawai et al.

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