Patent ID: 7657197
Filing Date: 2010-02-02
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a rotatable photosensitive member; a charging device for electrically charging said rotatable photosensitive member by being supplied with a charging bias in the form of a DC voltage biased with an AC voltage; an exposure device for exposing said rotatable photosensitive member electrically charged by said charging device to form an electrostatic latent image; a developing device for developing said electrostatic latent image in to a toner image; a transfer device for transferring said toner image onto an image receiving member; an adjusting device, disposed downstream of said transfer device and upstream of said charging device with respect to a rotational direction of said photosensitive member and disposed in contact with said photosensitive member, for adjusting an electric charge of residual toner remaining on said photosensitive member without being transferred onto said image receiving member; and a control device for controlling said charging bias so that a first AC bias is applied to said charging device during image formation and for controlling said charging bias so that a second AC bias is applied to said charging device during non-image formation; wherein a developing bias is applied so that an absolute value of a difference between a potential of an area, of said photosensitive member charged by application of said second AC bias, in which said residual toner is deposited, and a developing bias to be applied during non-image formation is larger than an absolute value of a difference between a potential of an area, of said photosensitive member charged by application of said second AC bias, in which the residual toner is not deposited, and a developing bias to be applied during non-image formation, thereby to collect said residual toner deposited on said photosensitive member.