Patent ID: 8805219
Filing Date: 2014-08-12
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a plurality of photosensitive members; a plurality of charging members, provided for said photosensitive members, respectively, for electrically charging said photosensitive members by being supplied with charging voltages each comprising a component of a DC voltage and a component of an AC voltage; an AC voltage source for outputting an AC voltage commonly applied to at least two of said charging members; control means for controlling the AC voltages applied to said at least two charging members; variable resistors connected between said AC voltage source and said at least two charging members, respectively; use situation detecting means for detecting use situations of said photosensitive members, respectively; and adjusting means for adjusting electric resistances of said variable resistors, respectively, wherein said adjusting means adjusts the electric resistances of said variable resistors in accordance with detection results of said use situation detecting means such that discharge currents flowing between said at least two charging members and said photosensitive members charged by said at least two charging members are within predetermined ranges, respectively.