Semiconductor laser driving circuit with control circuit power v

Details Semiconductor laser driving circuit with control circuit power v Semiconductor laser driving circuit with control circuit power v

1990-06-15

1992-12-08

Weinhardt, Robert

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

051703890

ABSTRACT:
The invention provides an improvement of the conventional laser driving circuit mainly including a control logic circuit, a reproducing power producing circuit, and a recording power producing circuit for preventing a recording film of a disk from being damaged by a laser in a reproducing mode. The improved respect is addition of a voltage monitoring circuit and a bypass transistor for an abnormal signal. The voltage monitoring circuit monitors a voltage drop caused in the control logic circuit and supplies a voltage abnormality indicating signal, thereby causing the bypass transistor to be conductive for allowing the abnormal signal to be flown therethrough.

REFERENCES:
patent: 4685097 (1987-08-01), van der Put
patent: 4692606 (1987-09-01), Sakai et al.
patent: 4785443 (1988-11-01), Minami et al.
Patent Abstracts of Japan vol. 7, No. 228 (P-228)(1373) Oct. 8, 1983 and JP-A-58 118 042 (Hitachi Seisakushi K.K.) Jul. 13, 1983.
Patent Abstracts of Japan vol. 8, No. 38 (P-255)(1475) Feb. 18, 1984 and JP-A-58 189 849 (Tokyo Shibaura Denki K.K.) Nov. 5, 1983.

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