| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a color image forming device of a tandem system which lessens the deterioration in a photoreceptor surface by active gas in repetitive use, is excellent in cleanability, does not give rise to image defects, such as fogging, image unsharpness, and black dots, and makes it possible to obtain high-density and bright color images with the lessened variation of deterioration in the fatigue between photoreceptors. SOLUTION: This color image forming device is <=16% in the coefficient of fluctuation of the shape coefficients of the respective toners used for developing means of plural image forming units and is <=27% in the coefficient of fluctuation in the number thereof and contains a hindered amine compound in the photosensitive layer or front surface layer of the electrophotographic photoreceptor.</p> |
