Apparatus for controlling optical output from semiconductor lase

Details Apparatus for controlling optical output from semiconductor lase Apparatus for controlling optical output from semiconductor lase

1988-04-07

1989-01-31

Sikes, William L.

Coherent light generators

Particular component circuitry

Optical pumping

372 31, H01S 300

Patent

active

048021792

ABSTRACT:
An apparatus for controlling an optical output from a semiconductor laser for use in a laser printer, designed to complete the emission intensity control in a short time and to prevent deterioration and thermorunaway even when a noise occurs, while enabling confirmation of whether or not the emission intensity control is completed without any abnormality. The intensity of emission from the semiconductor laser is compared with a reference value, and a current supplied to the semiconductor laser is changed in certain regular cycles is response to the result of comparison. Strobe signals are supplied in, for instance, the same cycles and the results of comparison are successively stored in a storage device of more than two bits by the timing corresponding to the strobe signals. An APC completion signal is output when the stored results of comparison exhibit successive inversions and when the current detection value is lower than the reference value. The current changing operation is terminated before a new strobe signal is supplied.

REFERENCES:
patent: 4611352 (1986-09-01), Fujito et al.
patent: 4663760 (1987-05-01), Shimata et al.
patent: 4734914 (1988-03-01), Yoshikawa
patent: 4745609 (1988-05-01), Yoshikawa

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