Patent ID: 8290383
Filing Date: 2012-10-16
Classification: G03G

Abstract:
1. A tandem electrophotographic image forming apparatus comprising: a plurality of toner image forming units disposed in a conveyance direction of a printing medium, each of the toner image forming units including a photoreceptor on which a toner image is formed and an ion conductive transfer member to which a transfer voltage is applied to cause the toner image to be transferred from the photoreceptor onto the printing medium; a fixing unit disposed at a downstream side of the toner image forming units in the conveyance direction of the printing medium, the fixing unit heating and fixing the toner images that have been transferred onto the printing medium; and a detecting unit provided at an upstream ion conductive transfer member at an upstream side in the conveyance direction of the printing medium and detecting an electric current at the time of toner transfer; wherein the transfer voltages applied to the ion conductive transfer members are independently controlled such that: