Patent ID: 7778575
Filing Date: 2010-08-17
Classification: G03G

Abstract:
1. An imaging apparatus comprising: a plurality of image carriers on which a plurality of different-colored toner images are formed, the image carriers being driven and rotated to transfer the different-colored toner images onto one of an endless transfer member that is driven to rotate in contact with the image carriers or a transfer material that is carried by the endless transfer member; a pattern forming unit configured to form detection patterns on the endless transfer member, the detection patterns being formed with distances separating detection patterns; a phase calculating unit that extracts a periodic rotational variation component of each of the image carriers, based on the distances between the detection patterns on the endless transfer member, from a combination of periodic rotational variation components generated within said imaging apparatus and calculates a rotational phase of each of the image carriers based on the extracted periodic rotational variation component; and a rotational phase adjusting unit that adjusts a rotation stop phase of each of the image carriers based on the calculated rotational phase, wherein the phase calculating unit divides the combination of periodic rotational variation components generated within said imaging apparatus into an in-phase component and a quadrature component of a rotational period of each of the image carriers and calculates the rotational phase of each of the image carriers based on the in-phase component and the quadrature component of the rotational period.