Exposure control device for use in electrophotographic printing

Details Exposure control device for use in electrophotographic printing Exposure control device for use in electrophotographic printing

1992-02-26

1994-09-13

Fuller, Benjamin R.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358298, G01D 942

Patent

active

053472985

ABSTRACT:
An electrophotographic printing apparatus including a semiconductor laser for generating a laser beam, a laser optical system for guiding the laser beam from the semiconductor laser, to repeatedly scan a scanning range constituted by an exposure area and a non-exposure area external to the exposure area, a sensing unit for sensing the laser beam falling on a reference position of the non-exposure area which is adjacent to the end of the exposure area at which exposure starts, and a control unit for controlling the semiconductor laser by synchronizing the timing of a scanning start for the exposure area with a sense signal from the sensing unit. In the exposure control device, the control unit includes a laser control circuit for energizing the semiconductor laser to generate a laser beam which has a first laser power when the laser optical system guides the laser beam to the exposure area, and a second laser power when the laser optical system guides the laser beam to the reference position.

REFERENCES:
patent: 4201994 (1980-05-01), Hoshito et al.
patent: 4214154 (1980-07-01), Sato
patent: 4727382 (1988-02-01), Negishi et al.
patent: 4742363 (1988-05-01), Shiraishi
patent: 5043745 (1991-08-01), Inoue et al.
patent: 5130524 (1992-07-01), Egawa et al.
patent: 5151586 (1992-09-01), Sato et al.
patent: 5189441 (1993-02-01), Fukui et al.
patent: 5280306 (1994-01-01), Yamaguchi

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