Patent ID: 7366446

Claim:
An image forming apparatus, comprising: a photosensitive drum on which an electrostatic latent image is formed; a developing roller that is disposed facing the photosensitive drum and supplies a developing agent to the electrostatic latent image formed on the photosensitive drum to develop the electrostatic latent image to a developing agent image; a photosensitive drum driving unit that rotatably drives the photosensitive drum; a developing roller driving unit that rotatably drives the developing roller; and a driving control unit that controls the photosensitive drum driving unit, and controls the developing roller driving unit so that a circumferential speed ratio of the developing roller with respect to the photosensitive drum varies according to a circumferential speed of the photosensitive drum when the developing roller supplies the developing agent to the electrostatic latent image formed on the photosensitive drum.