Patent ID: 7570907
Filing Date: 2009-08-04
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a rotating body rotating integrally with a plurality of marks provided at intervals with one another; a sensor that outputs pulses whenever each mark is detected; an actual interval measuring unit that measures an actual interval that is an output interval of the pulses from the sensor; a selecting unit that, if a current actual interval measured by the actual interval measuring unit is within a predetermined normal range, selects the current actual interval as a feedback amount, and that, if a current actual interval measured by the actual interval measuring unit is above or below the predetermined normal range, selects a target interval that is a target value of the output interval of the pulses from the sensor, instead of the current actual interval, as a feedback amount; and a control unit that compares the target interval with the feedback amount selected by the selecting unit to control rotation of the rotating body in a feedback manner so that a deviation between the target interval and the feedback amount becomes zero.