Voltage control apparatus for controlling a charger in an image

Details Voltage control apparatus for controlling a charger in an image Voltage control apparatus for controlling a charger in an image

1995-10-11

1997-08-19

Lee, S.

Electrophotography

Control of electrophotography process

Control of charging

G03G 1502

Patent

active

056598394

ABSTRACT:
An electrographic copying machine has a photoreceptor drum which moves so that a photosensitive layer on its surface is successively charged, exposed, developed and charge-removed. The photosensitive layer is made of an amorphous material. The drum surface is charged by a charger before a latent image is formed thereon through exposure. A voltage generator is provided which supplies the charger with a voltage to charge the drum surface. It takes time for the potential of the charged drum surface at the developing section to reach a predetermined potential from a potential higher than the predetermined potential due to a rise characteristic of the surface potential. A controller is provided which corrects an output voltage value of the voltage generator to a voltage value necessary for the drum surface to be charged at the predetermined potential in a predetermined number of charging operations performed until the surface potential reaches the predetermined potential.

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