Automatic density control method for a photocopying machine

Details Automatic density control method for a photocopying machine Automatic density control method for a photocopying machine

1982-08-03

1985-08-06

Grimley, A. T.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14R, 355 14E, 118665, G03G 1500

Patent

active

045332347

ABSTRACT:
A density controlling method for controlling the density of toner applied to the surface of a photosensitive drum of a photocopying machine is disclosed herein. A small area of the drum is irridated with light, and toner is applied thereon. A photo-transistor sensor senses the density of the toner, and a signal produced by the sensor is compared to a reference signal indicative of optimal toner density. The difference signal is then applied through a CPU to control both the bias voltage of the developing system and the speed of the toner motor.

REFERENCES:
patent: 2956487 (1960-10-01), Giaimo, Jr.
patent: 4082445 (1978-04-01), Steiner
patent: 4341461 (1982-07-01), Fantozzi
patent: 4372672 (1983-02-01), Pries
IBM Technical Disclosure Bulletin, vol. 19, No. 11, Apr. 1977, Smith, G. L., "Toner Concentration Control."

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