Image forming apparatus including first and second auxiliary...

Details Image forming apparatus including first and second auxiliary... Image forming apparatus including first and second auxiliary...

2005-11-08

2005-11-08

Tran, Hoan (Department: 2852)

Electrophotography

Supplemental electrophotographic process

Exposure or charging

C399S343000

Reexamination Certificate

active

06963707

ABSTRACT:
An image forming apparatus includes a photosensitive drum, a charge roller for charging the photosensitive drum, a developing device for developing an electrostatic latent image formed on the charged photosensitive drum with a developer, a first auxiliary charging brush which is located upstream from the charge roller in a movement direction of a surface of the photosensitive drum and applies a voltage of a polarity opposite to a normal polarity of a polarity opposite to a normal polarity of the developer, and a second auxiliary charging brush which is located downstream from the first auxiliary charging brush and upstream from the charge roller and applies a voltage of a polarity identical to the normal polarity of the developer. In the image forming apparatus, the first auxiliary charging brush is supplied with an AC voltage to be improved in recovery performance of a transfer residual developer, and contamination of charging means can be prevented.

REFERENCES:
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patent: 6421512 (2002-07-01), Watanabe et al.
patent: 2003/0077088 (2003-04-01), Adachi et al.
patent: 2004/0086297 (2004-05-01), Watanabe
patent: 63-149669 (1988-06-01), None
patent: 2000-215798 (2000-08-01), None

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