Automatic developing bias control device

Details Automatic developing bias control device Automatic developing bias control device

1984-02-23

1986-08-26

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3R, G03G 1509, G03G 2100

Patent

active

046079548

ABSTRACT:
An automatic developing bias control device for an electrophotographic copying machine in which a document image is led onto a photoreceptor through a lens to form an electrostatic latent image on the photoreceptor and the electrostatic latent image is visualized into a toner image by a developing device, the automatic developing bias control device operating on the principle of detecting the density of the document image by a detecting element disposed inside or outside the optical path, delaying the output detection signal for a predetermined time, and imposing a developing bias potential corresponding to the delayed output detection signal on the developing device to thereby provide copy image quality faithful to the original.

REFERENCES:
patent: 3877413 (1975-04-01), Rowell et al.
patent: 3918395 (1975-11-01), Fearnside
patent: 4153364 (1979-05-01), Suzuki et al.
patent: 4239374 (1980-12-01), Tatsumi et al.

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