Bias power source controller for an image forming apparatus

Details Bias power source controller for an image forming apparatus Bias power source controller for an image forming apparatus

1988-08-05

1990-09-25

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355246, G03G 2100

Patent

active

049596870

ABSTRACT:
A controller for controlling a bias power source associated with, for example, a developing unit of an electrophotographic copier such that a bias voltage to be applied to the developing unit for the adjustment of image density is variable in level. The controller includes a central processing unit in which a timer/event counter is built in for delivering a trigger pulse signal to trigger the power source. In order to produce a bias voltage associated with a desired density level, the trigger pulse signal is subjected to pulse width modulation control at a period which is far shorter than an output time consant of the power source.

REFERENCES:
patent: 4256401 (1981-03-01), Fujimura et al.
patent: 4624548 (1986-11-01), Takayanagi
patent: 4640603 (1987-02-01), Honma

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