Patent ID: 9014584
Filing Date: 2015-04-21
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a first image bearing member for bearing a toner image; a second image bearing member for bearing a toner image; a movable belt; a first transfer unit for transferring the toner image from said first image bearing member onto said belt or a toner image receiving material conveyed by said belt; a second transfer unit for transferring the toner image from said second image bearing member onto said belt or the toner image receiving material; a first voltage applying unit for applying a voltage to said first transfer unit; a second voltage applying unit for applying a voltage to said second transfer unit; a detecting unit, connected to said first transfer unit, for detecting a value of a current passing through said first voltage applying unit; and a controller for controlling said first voltage applying unit and said second voltage applying unit, wherein said controller controls said first voltage applying unit so that a transfer voltage is applied from said first voltage applying unit to said first transfer unit during image formation on the basis of a first detection result of said detecting unit detected in a state in which the same voltage is applied from said first and second voltage applying units to said first and second transfer units, respectively, and on the basis of a second detection result of said detecting unit detected in a state in which a first voltage is applied from said first voltage applying unit to said first transfer unit and voltage application from said second voltage applying unit is stopped, and wherein the first voltage has the same polarity and the same absolute value as the same voltage.