BELT DRIVE CONTROL METHOD, ITS DEVICE, BELT DEVICE, IMAGE FORMING DEVICE, PROCESS CARTRIDGE, PROGRAM AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a belt drive control method and its device in which a belt is driven at a constant moving speed without being affected by the fluctuation in the thickness of the belt while increase in the cost is suppressed, to provide a belt device, a process cartridge, an image forming device, a program and a recording medium.

SOLUTION: Detection is made for rotational angular displacement or rotational angular velocity of a follower roller 502, alternating components in the rotational angular velocity having the frequency corresponding to the periodic thickness fluctuation along the peripheral direction of a belt 500 are extracted based on the detection results and rotation of a driving roller 501 is controlled based on the amplitude and the phase of the alternating components.

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