Patent ID: 7450138
Filing Date: 2008-11-11
Classification: G03G,G06K,H04N

Abstract:
1. An image forming apparatus for forming a full color image by superimposing a plurality of color images including a first color image, a second color image, a third color image, and a fourth color image, the apparatus comprising: an image carrier configured to rotate in a first direction; an intermediate transfer body including at least one mark thereon, configured to rotate in a direction opposite to the first direction; a mark detector provided in a vicinity of the intermediate transfer body and configured to output an image forming start signal; a light detector provided in a vicinity of the image carrier and configured to output a synchronization signal at a timing determined by a periodic cycle value T; a timing controller configured to determine: wherein the initial value of each one of the first time value, the second time value, the third time value, and the fourth time value is determined based on a time period between a timing when the image forming start signal is output and the timing when the synchronization signal is output; and an optical writing device configured to scan an n number of light beams in a direction perpendicular to the first direction to form, on a surface of the image carrier, the first color image at a timing indicated by the first time value, the second color image at a timing indicated by the second time value, the third color image at a timing indicated by the third time value, and the fourth color image at a timing indicated by the fourth time value.