Patent ID: 7970317

Claim:
An image forming apparatus comprising: a rotating member; a driving force transmission unit configured to transmit drive force to the rotating member; a drive unit configured to rotationally drive the rotating member via the driving force transmission unit; a detecting unit configured to detect a velocity of the rotating member and generate velocity data based on the detected velocity; and a control unit configured to control the drive unit based on the velocity data by inputting a drive velocity instruction value to the drive unit, wherein the control unit calculates velocity variation data by subtracting the drive velocity instruction value from the velocity data detected by the detecting unit, wherein the control unit obtains filter calculated data by filtering the velocity variation data, wherein the control unit calculates a correction value to be added to the drive velocity instruction value so as to cancel the filter calculated data during one rotation of the rotating member, wherein the control unit calculates modification data so that a sum of the correction value is 0, and wherein the control unit controls the drive unit based on a correction drive instruction value calculated by adding the drive velocity instruction value to the modification data.