Electrophotographic density control

Details Electrophotographic density control Electrophotographic density control

1979-07-20

1981-08-18

Moses, Richard L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14CH, G03G 1500

Patent

active

042843448

ABSTRACT:
A photoreceptor charge control arrangement to be employed for electrophotographic copying apparatuses wherein a specific circumferential portion on a uniformly charged photoreceptor is first exposed by a referenced exposure source to a specific amount of exposure and successively, the surface potential of the circumferential portion mentioned above is detected either at the relative position immediately before a position for an imagewise light exposing station or at the position juxtaposing the position of the station mentioned above, so that the successive comparison of the surface potential thus detected with a fixed reference is capable of effectively providing an appropriate control signal which can be employed to compensate the amount of exposure of the exposure source, irrespective of the surface condition of the photoreceptor.

REFERENCES:
patent: 3321307 (1967-05-01), Urbach
patent: 3525936 (1970-08-01), Vosteen
patent: 3743405 (1973-07-01), Morse et al.
patent: 3788739 (1974-01-01), Coriale
patent: 3887845 (1975-06-01), Michatek
patent: 3914049 (1975-10-01), Basu et al.
patent: 3944354 (1976-03-01), Benwood et al.
patent: 4063154 (1977-12-01), Andrus
patent: 4063155 (1977-12-01), Buchheit
patent: 4087171 (1978-05-01), Yano
patent: 4176943 (1979-12-01), Hasebe

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