Patent ID: 7813685

Claim:
An image forming apparatus, comprising: an image bearing member configured to bear an image on a surface thereof; and a transfer device configured to transfer the image from the surface of the image bearing member, to a recording medium, the transfer device including an endless moving member which conveys the recording medium, the endless moving member held in contact with the image bearing member, and a brush member configured to apply a transfer bias with respect to the endless moving member, the brush member including a fiber portion including a plurality of fibers arranged in a standing condition, the plurality of fibers including respective fiber tips which collectively form a whole brush surface, the fiber tips held in contact with an inner surface of the endless moving member, and a supporting member configured to support the fiber portion on a surface thereof, wherein the brush member is configured to have a whole brush current value per unit area of the whole brush surface equal to or smaller than 2.5 μA/cm 2 and a maximum sectional scanned current value per unit area of a portion of the whole brush surface equal to or smaller than 22.0 μA/cm 2 , the sectional scanned current values being values of sectional transfer current obtained by sequentially scanning the whole brush surface at a predetermined interval, and the maximum sectional scanned current value determined from the sectional scanned current values.