Laser diode driving apparatus in an optical information recordin

Details Laser diode driving apparatus in an optical information recordin Laser diode driving apparatus in an optical information recordin

1995-12-27

1998-02-24

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

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B41J 747

Patent

active

057215804

ABSTRACT:
Disclosed is a laser diode driving apparatus in a optical information recording and reproducing apparatus by which the bottom power of a laser beam for the information recording and reproducing may be maintained stably at a target value. A bottom power corrected value is obtained by multiplying the peak power of a laser beam for the information recording by a predetermined coefficient. Then, the bottom power corrected value is added with a target bottom power to set the summed value as a corrected target bottom power. The bottom level of an optical power detection signal is subtracted from the corrected target bottom power to provide the remaining value as an error signal. The bottom power of the laser beam is adjusted on the basis of the error signal.

REFERENCES:
patent: 4803497 (1989-02-01), Kennedy, Jr. et al.
patent: 5216443 (1993-06-01), Thornton et al.

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