Injection charging device promoting uniform charging of an...

Details Injection charging device promoting uniform charging of an... Injection charging device promoting uniform charging of an...

2006-04-24

2008-11-25

Gray, David M (Department: 2852)

Electrophotography

Control of electrophotography process

Control of charging

C399S174000

Reexamination Certificate

active

07457555

ABSTRACT:
An image forming apparatus includes an image bearing member; a plurality of chargers for injection charging of the image bearing member; a latent image forming device, disposed downstream of the plurality of charging members with respect to a moving direction of a peripheral surface of the image bearing member, for forming a latent image on the image bearing member having been charged by the plurality of charging members; a potential detecting device for detecting a surface potential of the image bearing member after passing by the plurality of charging members, wherein the plurality of chargers include a first charger and a second charger disposed at a most downstream position with respect to the moving direction, and wherein the image forming apparatus is operable in a control mode in which a bias voltage applied to the first charger is changed with a bias voltage applied to the second charger unchanged.

REFERENCES:
patent: 6909859 (2005-06-01), Nakamura et al.
patent: 7103303 (2006-09-01), Suzuki et al.
patent: 2003/0228172 (2003-12-01), Nakamura et al.
patent: 2005/0008396 (2005-01-01), Nakamura et al.
patent: 2005/0135839 (2005-06-01), Inoue
patent: 2005/0271419 (2005-12-01), Nakamura et al.
patent: 2004-29361 (2004-01-01), None
Office Action, dated Jun. 27, 2008, issued in Chinese counterpart Patent Application No. 2006100774811 and English-language translation thereof.

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