Electrophotographic apparatus with corona discharge control

Details Electrophotographic apparatus with corona discharge control Electrophotographic apparatus with corona discharge control

1979-10-04

1981-05-19

Pellinen, A. D.

Photocopying

Including fiber optics

307 24, 361235, G03G 1502

Patent

active

042681618

ABSTRACT:
An electrophotographic apparatus includes a photosensitive member with a conductive layer, a photoconductive layer and an insulating layer; a variably controlled primary corona discharger for applying a charge of a predetermined potential onto the surface of the photosensitive member, a secondary corona discharger for applying a corona discharge containing a component of which polarity is opposite to that of the primary corona discharge; an imagewise exposure device for exposing the photosensitive member to an image light substantially simultaneously with the corona discharge by the secondary corona discharger, and high voltage source, for supplying predetermined high voltages to the primary and secondary corona discharger, having a high voltage transformer provided at least with a primary input coil, a secondary high voltage output coil and a tertially coil associated with a variable load impedance. An electrostatic latent image of a predetermined contrast is formed on the photosensitive member.

REFERENCES:
patent: 2892148 (1959-06-01), Large et al.
patent: 3103618 (1963-09-01), Slater
patent: 3182249 (1965-05-01), Pahlavan
patent: 3188554 (1965-06-01), Reid
patent: 3568042 (1971-03-01), Casa
patent: 3714531 (1973-01-01), Takahashi
patent: 3775104 (1973-11-01), Matsumoto et al.
patent: 4045217 (1977-08-01), Fujimura
patent: 4092582 (1978-05-01), Newbould
patent: 4136942 (1979-01-01), Nakahata et al.
patent: 4142791 (1979-03-01), Nishikawa et al.

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