| 摘要 |
PURPOSE:To prevent the occurrence of an abnormal image having the track of a paper feeding roller, scattering toner and a honey comb, etc., at secondary transfer by making the electrostatically charged toner quantity on an intermediate transfer body equal to or exceeding a specified value. CONSTITUTION:As to the image forming device using the intermediate transfer system, the electrostatically charged toner quantity on the intermediate transfer body 19 which is second-transferred onto the transfer material is mode >=12muC/gr by an electrifying control means. Thus, the optimum secondary transfer bias area which is judged as the area to be satisfactorily practicable is obtained, so that the occurrence of the abnormal image in the intermediate transfer system is suppressed. At this time, the surface resistivity of the intermediate transfer body is set to be the intermediate resistance value within 1X10<7>-1X10<12>OMEGAcm<2>, and it is made more effective. And also, by detecting an environmental absolute temperature in a set environment for the device main body, deciding and controlling a voltage, or a current to be supplied to a primary transfer electric field forming means 20, or a corona discharge means 49 based on the detected temperature, the electrostatically charged toner quantity is kept equal to or exceeding the prescribed value, and the occurrence of the abnormal image in the intermediate transfer system is prevented. |
