Patent ID: 8693920
Filing Date: 2014-04-08
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a first image forming unit configured to form a toner image on a first photosensitive member; a DC motor configured to drive the first photosensitive member for rotation; a detection unit configured to detect information on a rotational speed of the first photosensitive member; a second image forming unit configured to form a toner image on a second photosensitive member; a stepper motor configured to drive the second photosensitive member for rotation; a transfer unit configured to transfer toner images formed on the first and second photosensitive members to a sheet; a first control unit configured to generate a control value of the DC motor based on the detected information on the rotational speed of the first photosensitive member and a first speed command; and a second control unit configured to control a drive frequency of the stepper motor based on information on the rotational speed of the first photosensitive member.