Patent ID: 7711279
Filing Date: 2010-05-04
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a rotatable image bearing member on which an electrostatic latent image is formed; a charging member for being supplied with a charging voltage which is a DC voltage not having an AC voltage component and for contacting said image bearing member to electrically charge a surface of said image bearing member using an electric discharge; and a transfer member for transferring onto a transfer material a toner image formed on the surface of said image bearing member by developing the electrostatic latent image, at a transfer position, wherein a charging potential of said charging member is different between a time when said charging member provides a first region with a first potential and a time when said charging member provides a second region with a second potential, thus providing a predetermined potential difference between said first region and said second region, wherein said transfer member is not supplied with a voltage when said second region after being charged by said charging member is at the transfer position, and wherein said first region is a region on said image bearing member which has been charged by said charging member and which is to be an image forming region, and said second region is a region of said image bearing member which is a non-image-forming region and a region which precedes said first region for one full rotation of the image bearing member in a rotational direction of said image bearing member.