Image forming apparatus and developing method

Details Image forming apparatus and developing method Image forming apparatus and developing method

2005-10-22

2009-06-30

Gray, David M (Department: 2852)

Electrophotography

Control of electrophotography process

Control of developing

C399S044000, C399S097000

Reexamination Certificate

active

07555232

ABSTRACT:
An image forming apparatus has a plurality of developing devices each including a developing member carrying and transferring developer toward a developing region and a charging member charging developer carried by the developing member, a development bias applying device applying an AC development bias voltage to the developing member, and a charge bias applying device applying to the charging member an AC charge bias voltage having a phase synchronized with the AC development bias voltage and representing a charge bias voltage value causing an offset potential difference with respect to the AC development bias voltage in a phase on one of positive and negative sides. The charge bias voltage applied by the charge bias applying device provided for each of the developing devices has the same voltage value as the charge bias voltages applied by the charge bias applying devices of the other charge bias applying devices.

REFERENCES:
patent: 7092662 (2006-08-01), Yamamura
patent: 2005/0158061 (2005-07-01), Do
patent: 2001-109243 (2001-04-01), None
patent: 2001-265110 (2001-09-01), None
patent: 2002-148894 (2002-05-01), None
patent: 2003-057945 (2003-02-01), None
patent: 2004-163502 (2004-06-01), None
Japanese Decision to Grant Patent for Application No. 2005-125564, dated Feb. 26, 2008 and its English translation.

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