Optical disc write/read methods and apparatus with improved focu

Details Optical disc write/read methods and apparatus with improved focu Optical disc write/read methods and apparatus with improved focu

1982-06-30

1984-10-02

Hecker, Stuart N.

Static information storage and retrieval

Read/write circuit

Optical

369 45, 250570, G11C 1304

Patent

active

044751796

ABSTRACT:
Spot-focus of a write or read beam upon a flexible optical disc, which is rotated with its neutral plane highly stabilized in space, is maintained precisely by moving the write or read beam source (e.g. a laser diode) in response to focus error signals.

REFERENCES:
patent: 3673412 (1972-06-01), Olson
patent: 4037929 (1977-07-01), Bricot et al.
patent: 4051529 (1977-09-01), Miyaoka
patent: 4124273 (1978-11-01), Huignard et al.
patent: 4167029 (1979-09-01), Ragle et al.
patent: 4193091 (1980-03-01), Kleuters et al.
patent: 4337531 (1982-06-01), Willemsen
patent: 4345321 (1982-08-01), Arquie et al.
patent: 4385373 (1983-05-01), Howe

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