Patent ID: 7417651
Filing Date: 2008-08-26
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a transfer medium which moves in a predetermined moving direction; a plurality of image forming stations, arranged along the moving direction, which form toner images of mutually different colors as registration marks on a surface of the transfer medium such that the toner images are spaced apart from each other along the moving direction; an optical sensor which detects each of the plural registration marks and outputs a signal; and a controller which corrects a color misregistration between/among the plural colors based on the output signal from the optical sensor, wherein each of the plural registration marks is formed by a two-dimensional pattern and a linear pattern which extends along a main scanning direction which is approximately orthogonal to the moving direction, and wherein the linear pattern and the two-dimensional pattern are spaced apart from each other along the moving direction.