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Patent Searching and Data

Document Type and Number:
Japanese Patent JP2706262
Kind Code:
A laser driving device is disclosed. The laser driving device includes a semiconductor laser, a current source for supplying an electric current to the semiconductor laser, a photodetector for monitoring light emitted from the semiconductor laser, a plurality of setting circuits for outputting reference signals of different levels, a switching circuit for selecting one of the outputs of the setting circuits, a comparing circuit for comparing the output selected by the switching circuit with the output of the photodetector, and a control circuit for controlling the electric current supplied to the semiconductor laser on the basis of the output of the comparing circuit so that the two outputs become equal to each other. Also disclosed is an optical information recording apparatus using such a laser driving device.

Etsuo Yamada
Application Number:
Publication Date:
January 28, 1998
Filing Date:
July 12, 1988
Export Citation:
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Canon Inc
International Classes:
G11B7/125; H01S5/0683; H01S5/062; (IPC1-7): G11B7/125
Attorney, Agent or Firm: