Optical type information reproducing device

Details Optical type information reproducing device Optical type information reproducing device

1985-05-15

1987-10-06

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369106, G11B 700

Patent

active

046987975

ABSTRACT:
An optical type information reproducing device for playing back a laser disc comprises a laser beam source for projecting laser beam on the laser disc, a pickup and signal processing circuit for receiving the laser beam reflected from or transmitted through the disc and performing photo-electric conversion and signal processings and outputting a reproduced signal, and a laser beam source control circuit responsive to the level of the laser beam received by the pickup and signal processing circuit for controlling the level of the laser beam. By detecting the level of the laser beam reflected from or transmitted through the disc and controlling the laser beam output in response to the detected value, the level of the reflected or transmitted laser beam is maintained at a constant value.

REFERENCES:
patent: 4114180 (1978-09-01), Kayanuma
patent: 4150402 (1979-04-01), Tietze et al.
patent: 4162398 (1979-07-01), Kamanuma
patent: 4334301 (1982-06-01), Kanamaru
patent: 4570251 (1986-02-01), Yokota et al.
Japanese Book Entitled, "Compact Disk Player for Beginners", pp. 42-45 (first published 7/20/83).

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