Image forming apparatus and method for controlling charging pote

Details Image forming apparatus and method for controlling charging pote Image forming apparatus and method for controlling charging pote

1996-09-16

1998-09-22

Royer, William J.

Electrophotography

Control of electrophotography process

Control of charging

399169, G03G 1502

Patent

active

058129049

ABSTRACT:
A system for controlling a potential of a photosensitive drum for a laser beam printer having a photosensitive drum on which an electrostatic image is formed, a charger for applying voltages differentially to an image forming area where the photosensitive drum contacts a recording medium and to a non-image forming area where the photosensitive drum does not contact the recording medium to charge the outer surface of the photosensitive drum to a given polarity, a light scanner unit for forming an electrostatic latent image on the drum corresponding to image data, a developing unit for applying toner onto the photosensitive drum during the image forming area and a transfer charger for transferring a toner image formed on the drum to the recording medium. The system includes a potential controlling unit for applying a first charging potential to the photosensitive drum during the image forming area to charge the photosensitive drum to a given voltage for development, and for applying a second charging potential to the photosensitive drum during the non-image forming area.

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patent: 5450180 (1995-09-01), Ohzeki et al.
patent: 5534982 (1996-07-01), Sakaizawa et al.
patent: 5568232 (1996-10-01), Kashihara

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