Electrophotographic apparatus

Details Electrophotographic apparatus Electrophotographic apparatus

1980-09-26

1983-09-06

Braun, Fred L.

Photocopying

Including fiber optics

355 3CH, 355 14TR, G03G 1514, G03G 1516

Patent

active

044025912

ABSTRACT:
An electrophotographic apparatus in which a pre-transfer corona discharger is provided between a developing device and a transfer charger, an AC is applied to the discharge electrode of the discharger, a grid is provided in the opening portion of the discharger, a potential between the dark portion potential and the light portion potential on a photosensitive member is applied as a bias potential, corona discharge of the same polarity as the charge polarity of toner is imparted to toner adhering the dark portion having a potential greater than the grid bias potential to increase the transfer efficiency, and corona discharge of the opposite polarity to the polarity of toner is imparted to toner in the light portion to change the charge polarity of toner and thereby prevent fog.

REFERENCES:
patent: 3457405 (1969-07-01), Del Vecchio et al.
patent: 3496351 (1970-02-01), Cunningham
patent: 3788739 (1974-01-01), Coriale
patent: 4039257 (1977-08-01), Connolly
patent: 4077709 (1978-03-01), Borostyan et al.
patent: 4110031 (1978-08-01), Ebi et al.
patent: 4141648 (1979-02-01), Gaitten et al.
patent: 4166690 (1979-09-01), Bacon et al.
patent: 4190348 (1980-02-01), Friday

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