Patent ID: 8315541

Claim:
An image forming apparatus comprising: a rotatable photosensitive member; a charging device for electrically charging said photosensitive member with electric discharge by being supplied with a voltage; a developing device for developing with toner an electrostatic image formed on said photosensitive member electrically charged by said charging device; a transfer device for transferring a toner image from said photosensitive member onto an image-receiving member, wherein a voltage of an opposite polarity to that of the voltage supplied to said charging device is applied to said transfer device; and an auxiliary charging device for electrically charging untransferred toner on said photosensitive member to a normal charge polarity before said photosensitive member is electrically charged by said charging device, wherein effective widths W PM , W CD , W DD , W TD , and W ACD of said photosensitive member, said charging device, said developing device, said transfer device, and said auxiliary charging device, respectively, satisfy: W PM >W CD >W ACD ≧W TD >W DD .