Light intensity control circuit for an optical scanning unit

Details Light intensity control circuit for an optical scanning unit Light intensity control circuit for an optical scanning unit

1994-08-26

1995-12-05

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250235, 358494, G01J 132

Patent

active

054731534

ABSTRACT:
A light intensity control circuit for an optical scanning device in which an intensity of a beam emitted by a laser diode, is modulated in accordance with an image signal. The image signal includes information about gradation levels of an image to be formed by the scanning device on a photoconductive surface. A first control circuit sets a first intensity value of the beam corresponding to a minimum gradation level of the image to be formed, and a second circuit sets a second intensity value of the beam corresponding to a maximum gradation level of the image to be formed. A driving circuit drives the laser diode such that the intensity of the beam is determined in accordance with the image signal and a difference between the first intensity value and the second intensity value.

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