Semiconductor laser driving circuit

Details Semiconductor laser driving circuit Semiconductor laser driving circuit

G - Physics

11

B

352/32.2

G11B 7/125 (2006.01) H01S 5/068 (2006.01)

Patent

CA 2019936

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.

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