Patent ID: 6693654
Filing Date: 2004-02-17
Classification: G03G

Abstract:
A color image formation apparatus comprising:an endless belt which is driven to rotate; a plurality of image processing sections arranged along a moving direction of the endless belt and which form images of different colors, respectively; a plurality of alignment sensors arranged in a direction orthogonal to the moving direction of the endless belt and each of which detects an alignment mark for each color formed by each of the image processing sections and transferred onto the endless belt; and a density adjustment sensor arranged at a position at which a detection area of the density adjustment sensor does not overlap with detection areas of the alignment sensors in the direction orthogonal to the moving direction of the endless belt, and which detects a density adjustment mark transferred onto the endless belt, wherein densities of the images formed by the image processing sections are adjusted corresponding to a detected result of the density adjustment sensor, and wherein a distance between an end of density marks and a beginning of alignment marks is less than a distance between a cleanina unit and the alignment and density adjustment sensors.