Patent ID: 6285849
Filing Date: 2001-09-04
Classification: G03G,H04N

Abstract:
A color image forming apparatus comprising:a plurality of image stations comprising photosensitive bodies, on which latent images are formed, and developing means for developing the latent images formed on said photosensitive bodies as toner images, for respective colors to be developed;a plurality of exposure means for irradiating light to said respective photosensitive bodies to form latent images;transfer means for successively superposing and transferring toner images of respective colors having been formed on said image stations to a transfer material to form a composite image on said transfer material;registering pattern generating means for generating registering patterns on said plurality of exposure means to form predetermined registering patterns on said image stations provided corresponding to said exposure means;pattern detecting means for detecting said predetermined registering patterns developed and transferred onto said transfer means, said pattern detecting means being composed of a semiconductor laser for irradiating laser beams on one of said predetermined registering patterns and a photosensor for detecting light reflected from said transfer means; andmisregistering correcting means for correcting misregistering on the basis of the results detected by said pattern detecting means, wherein said pattern detecting means is provided with comparison for outputting results of comparison between an output of said photosensor and a predetermined comparison value, and wherein said pattern detecting means is provided with comparison value varying means for making said predetermined comparison value for said output of said photosensor variable.