| 摘要 |
PROBLEM TO BE SOLVED: To detect color slurring based on the positional deviation of each electrophotographic processing part by a single inexpensive detecting means. SOLUTION: By driving at least two electrophotographic processing parts 8, the same deviation detecting marks 21 of two or more colors including a line in a main scanning direction and a line inclined thereto are formed in order on a carrying belt 7 and detected by a single reflection type photosensor 204 (detecting means) consisting of a light source, a slit and a photodetector. Thus, the color slurring in the main scanning direction and a subscanning direction is easily detected by the single inexpensive photosensor 204. |
