Method and device for preventing formation of background image i

Details Method and device for preventing formation of background image i Method and device for preventing formation of background image i

1998-05-07

1999-09-21

Moses, Richard

Electrophotography

Image formation

Development

399159, 430 35, G03G 1506, G03G 1500

Patent

active

059565500

ABSTRACT:
An electrophotographic image forming apparatus prevents the formation of a background image. The apparatus includes a photosensitive drum with a ground plate, and a power supply for applying a negative voltage to the ground plate in the case where the apparatus is powered on after a long time in the power-off state, or where the apparatus is powered on for many hours without forming an image. The applied negative voltage has a potential lower than a critical potential where the toner deposited on a developing roller can move to the photosensitive drum. Further, the negative voltage is applied to the ground plate, only while the charge location on the photosensitive drum rotates to reach a developing position.

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