Patent ID: 9229401
Filing Date: 2016-01-05
CPC Classification: G03G,H02P

Claim Text:
1. An image forming apparatus comprising: a drive unit that drives a rotator that rotates to form an image; a speed detection unit that detects a rotation speed of the rotator; a fluctuation component calculation unit that calculates a speed fluctuation component with respect to a previously set target speed on the basis of the rotation speed detected by the speed detection unit; a first filter processing unit that extracts a component having a first frequency from the speed fluctuation component; a second filter processing unit that extracts a component having a second frequency different from the first frequency from the speed fluctuation component; a first correction unit that performs a gain correction and a phase correction on the component extracted by the first filter processing unit; a second correction unit that performs a gain correction and a phase correction on the component extracted by the second filter processing unit; a speed correction amount calculation unit that calculates a speed correction amount by adding output values of the first correction unit and the second correction unit to each other; a storage unit that stores the speed correction amount while being associated with information related to a rotation position of the rotator; and a control unit that reads out the speed correction amount in accordance with the rotation position of the rotator from the storage unit and controls the rotation speed of the rotator on the basis of information related to the target speed of the rotator and the speed correction amount read out from the storage unit.