Developing unit for electrophotography

Details Developing unit for electrophotography Developing unit for electrophotography

1975-12-15

1977-02-08

Jaudon, Henry S.

Coating apparatus

With means to apply electrical and/or radiant energy to work...

With means to orient coating particles

118DIG23, 427 15, G03G 1310

Patent

active

040067092

ABSTRACT:
The unit comprises a plurality of detection electrodes disposed adjacent developing electrodes for sensing respective instantaneous potentials of portions of an electrostatic latent image carried on a rotating photosensitive drum so as to produce respective output signals. A potential source responsive to the signals applies a potential slightly higher than the lowermost one of the sensed potentials to the developing electrodes. A protective electrode plate has a plurality of apertures for disposition of respective detection electrodes therein, and has applied thereto a potential near those appearing on the detection electrodes, thereby cutting off the influence of external electrical fields upon the detection electrodes.

REFERENCES:
patent: 3719169 (1973-03-01), Cade et al.
patent: 3784397 (1974-01-01), Sato et al.
patent: 3831556 (1974-08-01), Sato et al.
patent: 3857549 (1974-12-01), Snelling

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