Image formation apparatus having charging means and...

Details Image formation apparatus having charging means and... Image formation apparatus having charging means and...

2006-02-07

2006-02-07

Tran, Hoan (Department: 2852)

Electrophotography

Supplemental electrophotographic process

Exposure or charging

C399S149000, C399S150000

Reexamination Certificate

active

06996355

ABSTRACT:
An image formation apparatus has developing agent charging device situated downstream in the direction of motion of a photosensitive drum from a transfer roller and upstream from a charging roller, for charging residual developing agent remaining on the photosensitive drum. Applying AC voltage to the charging roller is started before a portion on the face of the photosensitive drum where application of voltage to the developing agent charging device has started reaches a position of coming into contact with the charging roller, and applying AC voltage to the charging device is ended after the portion on the face of the photosensitive drum where application of voltage to the developing agent charging device has ended reaches a position of coming into contact with the charging roller. This configuration prevents adhesion of developing agent to the photosensitive drum and charging roller, avoids resultant substandard images, and provides high-quality images for prolonged periods.

REFERENCES:
patent: 6345162 (2002-02-01), Ozawa et al.
patent: 6421512 (2002-07-01), Watanabe et al.
patent: 6459872 (2002-10-01), Komiya et al.
patent: 6477342 (2002-11-01), Komiya et al.
patent: 6603941 (2003-08-01), Watanabe et al.
patent: 6611668 (2003-08-01), Watanabe et al.
patent: 6807384 (2004-10-01), Okubo et al.
patent: 2003/0077088 (2003-04-01), Adachi et al.

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