Charger, image forming apparatus, and charge control method

Details Charger, image forming apparatus, and charge control method Charger, image forming apparatus, and charge control method

2007-12-12

2010-11-16

Porta, David P (Department: 2884)

Electrophotography

Control of electrophotography process

Control of charging

C399S071000, C399S174000, C399S349000

Reexamination Certificate

active

07835655

ABSTRACT:
A charger includes: a first charging member that contacts an image carrier and a second charging member that contacts the image carrier downstream from the first charging member. At the time of image formation, a voltage higher than the discharge start voltage of the first charging member is applied to the first charging member and a voltage lower than the discharge start voltage of the second charging member and lower than the voltage applied to the first charging member is applied to the second charging member, and at the time when an image is not formed, a voltage lower than the discharge start voltage of the first charging member is applied to the first charging member and a voltage higher than the discharge start voltage of the second charging member and higher than the voltage applied to the first charging member is applied to the second charging member.

REFERENCES:
patent: 5751405 (1998-05-01), Aita et al.
patent: 5832336 (1998-11-01), Kawasaki et al.
patent: 6421512 (2002-07-01), Watanabe et al.
patent: 10-048916 (1998-02-01), None
patent: 2005-331846 (2005-12-01), None

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