Patent ID: 7673981
Filing Date: 2010-03-09
Classification: B41J

Abstract:
1. An image formation apparatus, comprising: an image formation unit that forms color-component images that correspond to a plurality of color components onto a plurality of corresponding image-carrying bodies respectively; a transfer medium onto which the respective color-component images that are formed on said image-carrying bodies are transferred, the transfer medium facing said respective image-carrying bodies and moving in the same direction as a movement direction of the respective image-carrying bodies; and a position detection unit that detects positions of the respective color-component images that are transferred onto said transfer medium, said image forming apparatus further adjusting an image formation timing based on the positions, detected by the position detection unit, of said respective color-component images, wherein said image-carrying bodies are photosensitive drums, said image formation unit comprises one polygon mirror and an irradiation unit that irradiates a plurality of light beams that correspond to said respective color-components onto the same reflection surface of the polygon mirror, said respective light beams reflected by said polygon mirror being irradiated onto said respective photosensitive drums, said image formation unit forms the color-component images each having a length in a movement direction of each of the photosensitive drums that corresponds to an integral multiple of the number of surfaces of the polygon mirror+1 when the image formation timing is adjusted, said detection unit detects an average position between a front end position and a rear end position in a length direction of each of said respective color-component images as a position of each of said color-component images, and said formation timing of each of said color-component images to be adjusted is adjusted so that an interval between the color-component image to be a reference having the position detected by said position detecting unit and the color-component image to be adjusted is a predetermined interval.