High-speed, reflex-controlled laser circuit for an electrophotog

Details High-speed, reflex-controlled laser circuit for an electrophotog High-speed, reflex-controlled laser circuit for an electrophotog

1996-03-27

1998-03-03

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347247, B41J 247

Patent

active

057240884

ABSTRACT:
A control system for the laser diode of a raster output scanner, such as used in a laser printer, uses reflex exposure control and a high-speed drive circuit. With the creation of each pixel on the photoreceptor, a sensor receiving some of the light flux from the diode accumulates charge on a capacitor, and when the charge on the capacitor exceeds a predetermined amount, a reflex circuit acts to shut the laser diode off. The laser diode is modulated via a high-speed trigger circuit wherein the diode is maintained just below its lasing voltage.

REFERENCES:
patent: 4685097 (1987-08-01), van der Put
patent: 4868675 (1989-09-01), Joosten et al.
patent: 5061949 (1991-10-01), Ogino et al.
patent: 5164745 (1992-11-01), Matsuoka
patent: 5497181 (1996-03-01), Paoli
patent: 5651017 (1997-07-01), Genovese

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