Automatic power controller for semiconductor laser

Details Automatic power controller for semiconductor laser Automatic power controller for semiconductor laser

1988-02-16

1989-11-07

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

372 29, G01J 132

Patent

active

048794597

ABSTRACT:
A controller for controlling the output intensity of a semiconductor laser used in a laser printer or the like in such a manner that the desired adjustment value is obtained, even in the presence of noise in a signal P.sub.D indicating the value of the detected intensity. An adjustment value is provided depending on the results of a comparison between the signal P.sub.D and a set value P.sub.S. The adjustment value is decreased when P.sub.S <P.sub.D and increased when P.sub.D <P.sub.S. The current through the semiconductor laser is adjusted in accordance with this set value.

REFERENCES:
patent: 4605848 (1986-08-01), Ogawa
patent: 4647981 (1987-03-01), Froelich
patent: 4677287 (1987-06-01), Ejima
patent: 4692606 (1987-09-01), Sakai et al.
patent: 4695714 (1987-09-01), Kimizuka et al.

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