Patent ID: 7609987
Filing Date: 2009-10-27
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a plurality of image forming units adapted to sequentially form images using different colors on an endless belt or on a printing material conveyed by the endless belt; a control unit adapted to form a misregistration detection pattern on the endless belt using said image forming units; and a detection unit adapted to detect the misregistration detection pattern formed on the endless belt, wherein said misregistration detection pattern includes: a first pattern array constructed with a plurality of serial first patterns, each formed with one of misregistration detection colors and a reference position color; and a second pattern array constructed with a plurality of serial second patterns, each formed with one of misregistration detection colors and a reference position color, wherein the first pattern and the second pattern have different shapes, and a color order of the plurality of first patterns constituting said first pattern array and a color order of the plurality of second patterns constituting said second pattern array are different; and wherein at least one of a length between patterns having an identical shape formed with an identical misregistration detection color and a length between patterns formed with an identical misregistration detection color extending across the first pattern array and the second pattern array correspond to a size of a member that causes driving unevenness.