Image forming apparatus

Electrophotography – Machine operation – Having power supply

Reexamination Certificate

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Details

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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patent: 2002/0041767 (2002-04-01), Saito et al.
patent: 2007/0098424 (2007-05-01), Okada
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patent: 2004-205583 (2004-07-01), None
patent: 2005-300745 (2005-10-01), None
patent: 2006-171282 (2006-06-01), None
patent: 2006-301437 (2006-11-01), None

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