Optical information recording and reproducing memory system

Details Optical information recording and reproducing memory system Optical information recording and reproducing memory system

1985-11-20

1988-05-03

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369106, 369120, 369121, 369116, G11B 700

Patent

active

047425059

ABSTRACT:
An optical information recording and reproducing system comprises a light source for emitting a working beam from a front end thereof and a monitoring beam from a rear end thereof, an optical system control circuit, a loop gain adjusting circuit and a photo detector. The monitoring beam emitted from the rear end of the light source is detected by the photo detector, and the loop gain of the servo loop control circuit for the focusing and/or tracking is automatically adjusted by means of the loop gain adjusting circuit according to the detected signal so that a desired closed loop control of the working beam can be performed according to the operation modes and the light beam power variation.

REFERENCES:
patent: 3996526 (1976-12-01), d'Auria et al.
patent: 4241423 (1980-12-01), Burke et al.
patent: 4516242 (1985-05-01), Yokota
patent: 4520469 (1985-05-01), Todokoro et al.
patent: 4585933 (1986-04-01), Ando
Karr et al; "Output Power Stability of GaAlAs Laser Transmitters using an Optical Tap for Feedback Control"; Applied Optics, vol. 18, No. 8, Apr. 79.
K. D. Broadbent, Journal of the Society of Motion Picture and Television Engineers, vol. 83, No. 7, Jul. 1974, pp. 553-559.

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