Patent ID: 9134658
Filing Date: 2015-09-15
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a movable image bearing member; a charging member configured to charge said image bearing member at a charge portion; a detecting member configured to detect a current flowing through said charging member; a toner image forming unit configured to form a toner image on said image bearing member; a transfer member configured to transfer, at a transfer portion, a toner image formed on said image bearing member onto a transfer medium; a transferring voltage source configured to apply a voltage to said transfer member; and a controller configured to execute a setting mode for setting a voltage to be applied to said transfer member at the time when the toner image is transferred onto the transfer medium, so that a predetermined current flows through said charging member when such an area of said image bearing member as has carried the toner image transferred onto the transfer medium at the transfer portion then passes through the charge portion, the setting mode being executed on the basis of a current detected by said detecting member when such an area of said image bearing member as has been charged by said charging member and has been passed through the transfer portion in a state that a test voltage is applied to said transfer member then passes through the charge portion in a period in which no toner image passes through the transfer portion.