Image forming apparatus

Details Image forming apparatus Image forming apparatus

2005-09-13

2005-09-13

Tran, Hoan (Department: 2852)

Electrophotography

Supplemental electrophotographic process

Exposure or charging

C399S149000, C399S150000

Reexamination Certificate

active

06944416

ABSTRACT:
A cleaner-less image forming apparatus serves to prevent excessive expellation of toner from a photosensitive drum at the time of application of a bias voltage. A developer charging member for charging residual toner on the photosensitive drum is disposed in contact with the photosensitive drum at a location downstream of a transfer device and upstream of a charging device in a direction in which the photosensitive drum is rotating. A DC voltage of a polarity opposite to a normal charging polarity of the developer is applied to the developer charging member and has a slope whose absolute value at the start of voltage application is selectable from a first value and a second value which is greater than the first value.

REFERENCES:
patent: 6215967 (2001-04-01), Takeda et al.
patent: 6345162 (2002-02-01), Ozawa et al.
patent: 6421512 (2002-07-01), Watanabe 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: 2003/0059231 (2003-03-01), Watanabe et al.
patent: 2003/0147659 (2003-08-01), Yoshikawa et al.

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