| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming device capable of eliminating the problem accompanying the image quality or speeding-up in the conventional non- magnetic contact one component developing system, two component double developing system, two component-one component developing system or the like, and always obtaining the excellent image quality, and moreover dealing with speeding-up. SOLUTION: The two component developer consisting of toner and carriers is uses as the developer P, and two developing rollers Sa and Sb are placed opposite to a photoreceptor drum D. Moreover, the above developing roller Sa is set in the position held in contact with a magnetic brush of the above developing roller Sb, and developing bias potential on the above two developing rolls of the developing rollers Sa and Sb so that the only the toner among the above tow component developer P drawn up by the above developing roller Sb is shifted to the above developing roller Sa. In such a manner, since the one component development and the two component development is respectively performed by the two developing rollers, failures in the image quality specific to one component developing and two component developing are mutually interpolated, therefore the excellent image quality is always maintained. |
