Image forming apparatus having charging and discharging means

Details Image forming apparatus having charging and discharging means Image forming apparatus having charging and discharging means

1988-10-19

1990-09-25

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355274, G03G 1502, G03G 1516

Patent

active

049596888

ABSTRACT:
Prior to formation of a latent image on a movable image bearing member, the latent image bearing member is charged to a predetermined potential. Then, the image bearing member is contacted to discharging means, by which the image bearing member id discharged so that a substantially uniform charge potential is provided on the image bearing member. The voltage V2 (V) (0 when grounded) applied to the discharging means, the surface potential V1 (V) of the image bearing member before being discharged by the discharging means, and the charge starting voltage V.sub.TH (V) of the image bearing member satisfy .vertline.V1-V2.vertline..gtoreq..vertline.V.sub.TH .vertline. (V2=) when discharging grounded). By this, the charge moves from the image bearing member to the discharging means. The discharging means may be grounded or may be supplied with a voltage which is low enough not to charge alone the image bearing member. According to this invention, the absolute value of the surface potential of the image bearing member discharged by said discharging means is not dependent on the surface potential of the image bearing member before discharge, and can be made not less than .vertline.V.sub.TH .vertline.. The necessity of conventional uniform discharging means before the primary charge is eliminated so that the cost and the size of the image forming apparatus can be reduced.

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