Patent ID: 7702256

Claim:
An image forming apparatus comprising an electrophotographic photoreceptor, a charging unit, an exposure unit, a development unit, and a transfer unit, wherein: the image forming apparatus conducts charging, exposure, development, and transfer while moving a circumferential surface of the electrophotographic photoreceptor in a predetermined direction; the image forming apparatus further comprises a controlling unit which controls a moving velocity of the circumferential surface of the electrophotographic photoreceptor so that a time required for processes from charging to development is changeable; the electrophotographic photoreceptor includes an undercoat layer and a photosensitive layer; and the undercoat layer has a thickness of 15 to 50 μm and includes a metal oxide particle and an acceptor compound having a hydroxyl group, wherein the acceptor compound having the hydroxyl group is selected from the group consisting of monohydroxyanthraquinone, trihydroxyanthraquinone and aminohydroxyanthraquinone; wherein the acceptor compound is reacted with the metal oxide particle; and wherein the metal oxide particle was subjected to a surface treatment with a coupling agent.