US 7,596,331 B2
Image forming apparatus
Jiro Kinokuni, Abiko (Japan)
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan)
Filed on Jun. 06, 2007, as Appl. No. 11/758,954.
Claims priority of application No. 2006-161002 (JP), filed on Jun. 09, 2006.
Prior Publication US 2007/0286643 A1, Dec. 13, 2007
Int. Cl. G03G 15/02 (2006.01)
U.S. Cl. 399—50  [399/354; 399/55; 399/66; 399/127] 12 Claims
OG exemplary drawing
 
1. An image forming apparatus, comprising:
a rotatable image bearing member;
a charging member for electrically charging said image bearing member in contact with said image bearing member;
an exposure device for exposing said image bearing member electrically charged by said charging member to light, thereby forming an electrostatic latent image;
developing means for collecting toner from said image bearing member and for developing the electrostatic latent image into a toner image on said image bearing member;
a belt member;
a transfer member for transferring the toner image toward said belt member at a transfer position;
removing means for removing toner on said belt member;
an auxiliary charging brush member for electrically charging toner remaining on said image bearing member after transferring the toner image, said auxiliary charging brush member contacting said image bearing member at a position downstream from the transfer position and upstream from said charging member with respect to a movement direction of said image bearing member,
wherein a contact area is a portion of said image bearing member in contact with said auxiliary charging brush member before rotation of said image bearing member begins; and
voltage control means for applying an identical polarity voltage, which is a voltage having a polarity identical to a normal charge polarity of the toner, to said transfer member for at least a period of time from when the contact area first reaches the transfer position to a time when the contact area passes through and departs from the transfer position.