Image forming apparatus with constant current voltage control

Details Image forming apparatus with constant current voltage control Image forming apparatus with constant current voltage control

1998-09-21

2000-02-15

Pendegrass, Joan

Electrophotography

Control of electrophotography process

Control of transfer

399 88, G03G 1500, G03G 1516

Patent

active

060262575

ABSTRACT:
An image forming apparatus includes an image bearing member; a transfer member for transferring an image from the image bearing member onto a transfer material by a nip formed between the image bearing member and the transfer member; control means for effecting a constant current control for the transfer member with a predetermined current when a non-image area of the image bearing member is at the nip, and for effecting a constant voltage control for the transfer member during image transfer operation on the basis of a voltage applied to the transfer member during the constant current control; wherein a higher one of a constant voltage control signal for controlling the voltage in the constant voltage control and a constant current control signal for controlling the current in the constant current control, is selected as an output signal to the transfer member.

REFERENCES:
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patent: 5481336 (1996-01-01), Tachibana et al.
patent: 5682575 (1997-10-01), Komori
patent: 5713060 (1998-01-01), Sato et al.
patent: 5815782 (1998-09-01), Yokomori et al.
patent: 5819134 (1998-10-01), Sato et al.

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