| 摘要 |
PROBLEM TO BE SOLVED: To provide a registration system which accurately registers a color image on an image supporting member of a color printer to another color image. SOLUTION: In color printing using a color registration system for registering a plurality of color images on a photoreceptor belt 12 of the color printer 10, a register mark is image-formed on an image supporting surface. The register mark corresponds to the color image and is detected by register mark sensors 20A, 20B. In an initial general registration mode, a first register mark of an extended angular target 36 shape is automatically image-formed at first. Even when initial general misregistration is present, the extended angular target 36 is largely extended in a processing direction in order to avoid overlapping of the marks. A second register mark (a standard angular target 34 or the like) by which higher registration accuracy can be obtained when allowable initial registration is attained and which is arranged at a narrower space and has denser distribution, is image-formed. The registration targets 34, 36 can be generated along both sides of an image region 30 in the processing direction. |
