Apparatus for controlling intensity of laser beam emitted from s

Details Apparatus for controlling intensity of laser beam emitted from s Apparatus for controlling intensity of laser beam emitted from s

1990-12-27

1992-07-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

346108, G01J 132, G01D 942

Patent

active

051305240

ABSTRACT:
In an apparatus for adjusting the intensity of a light beam, a driving current which is gradually increased is supplied to a semiconductor laser in a warming-up mode. The intensity of the light beam is detected by a monitor detector and compared with a predetermined value. The comparison result is latched in a first latch circuit and a preset drive data is determined in accordance with the latched comparison data and stored in a memory. The semiconductor laser is driven in a printing mode, in accordance with the preset drive data stored in the memory mode so that a printing condition can be established in a relatively short time. In the printing mode, the intensity of the light beam is adjusted in accordance with the comparison result obtained in the printing mode.

REFERENCES:
patent: 4443695 (1984-04-01), Kitamura
patent: 4710779 (1987-12-01), Funaki et al.
patent: 4727382 (1988-02-01), Negishi et al.
patent: 4831247 (1989-05-01), Ishizaka
patent: 4853934 (1989-08-01), Sakurai
patent: 4856011 (1989-08-01), Shimada et al.

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