Patent ID: 7457555

Claim:
An image forming apparatus comprising: an image bearing member; a plurality of chargers for injection charging of said image bearing member; a latent image forming device, disposed downstream of said plurality of charging members with respect to a moving direction of a peripheral surface of said image bearing member, for forming a latent image on said image bearing member having been charged by said plurality of charging members; a potential detecting device for detecting a surface potential of said image bearing member after passing by said plurality of charging members, wherein said plurality of chargers include a first charger and a second charger disposed at a most downstream position with respect to the moving direction; and a control device for changing bias voltages applied to said first charger and to said second charger, wherein said control device is capable of changing a bias voltage applied to said first charger without changing a bias voltage applied to said second charger in accordance with a detection result of said potential detecting device.