Charging device and image forming apparatus provided therewith

Electrophotography – Control of electrophotography process – Control of charging

Reexamination Certificate

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Details

C399S115000, C399S150000

Reexamination Certificate

active

07092649

ABSTRACT:
An image forming apparatus has a charging member opposed to an outer circumferential surface of a rotating object to be charged. The image forming apparatus has a voltage applying section for applying a pulsating voltage Vsp between the charging member and the object to be charged. The pulsating voltage Vsp is obtained by superimposing a voltage component of a direct current on a voltage component that periodically changes. The image forming apparatus is made to satisfy a relation of Vpp≦|Vth|, where Vpp is a peak-to-peak voltage value of the pulsating voltage Vsp and Vth is a charging start voltage value of the object to be charged. The relation prevents opposite charge from being imparted to residual toner on the object to be charged.

REFERENCES:
patent: 5479244 (1995-12-01), Kashihara et al.
patent: 5678142 (1997-10-01), Saegusa
patent: 6240269 (2001-05-01), Kaya et al.
patent: 6596452 (2003-07-01), Magome et al.
patent: 6922539 (2005-07-01), Uyama et al.
patent: 2005/0063728 (2005-03-01), Harada et al.
patent: 63-149668 (1988-06-01), None
patent: 8-190269 (1996-07-01), None
patent: 2001-188405 (2001-07-01), None

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