Patent ID: 7558510
Filing Date: 2009-07-07
Classification: G03G

Abstract:
1. An image forming apparatus comprising, a plurality of image carriers; a driving unit that rotationally drives each of the plurality of image carriers in an individual manner; and a phase adjusting unit that adjusts, based on a reference rotation position on one of the image carriers, phase of rotational fluctuation of the other image carrier per one rotation, the phase adjusting unit including, a rotation plate that is arranged coaxially with each of the image carriers, and rotates integrally with the image carrier, a plurality of to-be-detected portions that are arranged on the rotation plate at predetermined intervals in a circle with respect to a rotation axis of the rotation plate, a plurality of detectors that detect the to-be-detected portions, and output a signal, a controller that obtains a rotational fluctuation component caused by one rotation of the image carrier based on the signal output from the detector, a clock generator that generates a reference clock to offset the rotational fluctuation component, and a drive controller that controls the driving unit to rotationally drive the image carrier based on the reference clock, and the reference rotation position is set at one of the to-be-detected portions.