| 摘要 |
PROBLEM TO BE SOLVED: To suppress occurrence of insufficient image density due to a secondary transfer defect in a secondary transfer nip resulting from contact between an intermediate transfer belt 31 and a sheet conveyance belt 41.SOLUTION: In a structure that secondary transfer bias comprising overlapping voltage obtained by overlapping AC voltage to DC voltage is output from a secondary transfer power source 39, out of two peak values in peak-to-peak of the secondary transfer bias, an absolute value of a transfer peak value imparting stronger electrostatic force in a transfer direction from an intermediate transfer belt 31 side toward a recording sheet side held by a nip to toner in a secondary transfer nip is made larger than an absolute value of first transfer bias.SELECTED DRAWING: Figure 5 |
