Charging device, image forming apparatus using the same and...

Details Charging device, image forming apparatus using the same and... Charging device, image forming apparatus using the same and...

2007-01-25

2009-12-15

Tran, Hoan H (Department: 2852)

Electrophotography

Control of electrophotography process

Having temperature or humidity detection

C399S050000

Reexamination Certificate

active

07634206

ABSTRACT:
A charging device includes a charging member disposed so as to rotate in contact with a surface of an image carrier to charge the image carrier surface, a bias voltage applying unit that applies a bias voltage to the charging member, the bias voltage having an AC voltage superimposed on a DC voltage, a DC current detector that detects a DC current flowing between the image carrier and the charging member, a filter that extracts only a specific component from the DC current detected by the DC current detector, and a controller that controls at least one of an AC voltage and an AC current to be applied to the charging member in accordance with an amount of variation of the specific component extracted from the DC current by the filter.

REFERENCES:
patent: 5276483 (1994-01-01), Hasegawa et al.
patent: 5646717 (1997-07-01), Hiroshima et al.
patent: 5805954 (1998-09-01), Takahashi
patent: 7139501 (2006-11-01), Takami et al.
patent: A-07-239603 (1995-09-01), None
patent: A-2004-333789 (2004-11-01), None

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