Bilderzeugungsgerät

摘要

An image forming apparatus includes a movable image bearing member; a device for forming an image on the image bearing member, the image forming device including a developing device for forming a toner image on the image bearing member; a transfer device for transferring a toner image onto a transfer material, the transfer device including transfer material carrying member for carrying the transfer material to an image transfer station; a toner content detector for detecting toner content, the detector detecting toner content using the toner deposited on the image bearing member by the developing device; and a controller for controlling the toner content in the developing device in accordance with an output of the detector; wherein the toner for the detection is deposited on such a portion of the image bearing member as to be out of contact from the transfer material carrying member.