Patent ID: 7991312

Claim:
An image forming apparatus comprising: a charging device configured to charge an image bearing member; an electrostatic image forming device configured to form an electrostatic image on the charged image bearing member; a development device including a developer bearing member configured to bear and convey a developer containing toner and carrier, and configured to apply a voltage to the developer bearing member to develop the electrostatic image to form a toner image; a transfer device configured to transfer the toner image on the image bearing member to a recording material; and a controller capable of performing a mode of controlling a potential of the image bearing member such that, during image formation to form an image on a recording material having a predetermined size, an absolute potential value (V 1 ) of a region on a surface of the image bearing member outside a region corresponding to a passage region for the recording material in a width direction orthogonal to a movement direction of the surface of the image bearing member, an absolute potential value (V 2 ) of a non-image portion in the region corresponding to the passage region for the recording material, and an absolute potential value (Vdc) of the developer bearing member satisfy the following condition: Vdc<V1<V2, wherein the controller is capable of changing the absolute potential value V 1 according to a length in a width direction orthogonal to a conveying direction of the recording material.