Corona charge system and apparatus for electrophotographic print

Details Corona charge system and apparatus for electrophotographic print Corona charge system and apparatus for electrophotographic print

1989-11-29

1991-05-21

Grimley, A. T.

Photocopying

Contact printing

Light boxes

G03G 1502

Patent

active

050179640

ABSTRACT:
In a high speed electrophotographic printing apparatus and method wherein a charge of desired polarity and potential is applied uniformly to a photoconductive surface of a rapidly rotating drum, an improvement is provided which comprises an electrometer located adjacent the drum surface for sensing and measuring the charge imparted to the surface. The electrometer is operatively connected through a programmable logic controller to a variable power output that drives the corona array to impart the charge to the drum surface. Irregularities in charge potential imparted to the surface are thereby measured by the electrometer with appropriate adjustment being made in the charge applied to the drum by the corona array.

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