Patent ID: 8791973

Claim:
An image forming apparatus comprising: a plurality of photosensitive members which are arranged in parallel and on which developer images are formable by supplying developer to electrostatic latent images, respectively; and an exposure device which is configured to illuminate light beams onto surfaces of the photosensitive members to form the electrostatic latent images, respectively, wherein the developer images on the respective photosensitive members are transferred to a transferred medium which is moved in a moving direction along an arrangement direction of the photosensitive members while contacting the respective photosensitive members, and wherein the exposure device is configured such that a beam diameter of a light beam exposing a surface of a most-upstream photosensitive member arranged at a most upstream side in the moving direction is larger than a beam diameter of a light beam exposing a surface of a most-downstream photosensitive member arranged at a most downstream side in the moving direction.