Image-forming apparatus including first and second charging...

Details Image-forming apparatus including first and second charging... Image-forming apparatus including first and second charging...

2005-09-20

2005-09-20

Grainger, Quana (Department: 2852)

Electrophotography

Image formation

Charging

C399S050000

Reexamination Certificate

active

06947688

ABSTRACT:
According to the present invention, in an image-forming apparatus having at least two chargers for charging a rotating image carrier, in accordance with change in bias applied to a second charger disposed on the downstream side in a rotational direction of the image carrier, the bias applied to a first charger disposed on the upstream side is changed. Thereby, the electric power required for the charging is reduced.

REFERENCES:
patent: 5805960 (1998-09-01), Suzuki et al.
patent: 5809379 (1998-09-01), Yano et al.
patent: 5895146 (1999-04-01), Waki et al.
patent: 2002/0076239 (2002-06-01), Inoue
patent: 6-3921 (1994-01-01), None
patent: 8-44153 (1996-02-01), None
patent: 09244355 (1997-09-01), None

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