Electrophotography – Machine operation – Having power supply
Reexamination Certificate
2011-03-01
2011-03-01
Gray, David M (Department: 2852)
Electrophotography
Machine operation
Having power supply
C399S050000, C399S174000
Reexamination Certificate
active
07899352
ABSTRACT:
An aspect of the invention provides a charging control device of a color image forming apparatus, and the charging control device can properly control a charging potential of an image bearing body such that fog and uneven density are not generated even in a low-temperature environment. The image forming apparatus includes a high-voltage generation circuit91which applies an oscillating voltage to the charging member42disposed in contact with an image bearing body41, a direct-current voltage and an alternating-current voltage being superimposed to form the oscillating voltage; a current detection unit92which detects a direct current value passed from the charging member42to the image bearing body41; and a voltage control unit96which controls the alternating-current voltage such that the detected direct-current value is maintained in a target current range. The image forming apparatus also includes an aging control unit95to perform running-in. The aging control unit95rotates and drives the image bearing body41while retaining the alternating-current voltage and the direct-current voltage at previously-set predetermined voltages.
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Maruyama Yoshihiko
Miyaji Shinki
Tomiie Norio
Gray David M
Jordan and Hamburg LLP
Kyocera Mita Corporation
Wong Joseph S
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