| 主权项 |
1. An image forming apparatus comprising:
a movable image bearing member for bearing a toner image; a transfer member for forming a transfer portion for transferring the toner image from said image bearing member onto a recording material; a constant voltage source for applying, to said transfer member, a transfer voltage for transferring the toner image onto the recording material and a returning voltage, opposite in polarity to the transfer voltage, for returning the toner image from said transfer member to said image bearing member; an executing portion capable of executing continuous image formation in a continuous image forming period in which the transfer voltage is applied to said transfer member when an image region of said image bearing member where the toner image is to be transferred onto the recording material passes through the transfer portion and in which the returning voltage is applied to said transfer member at a part of a time when an inter-image region of said image bearing member between an image and a subsequent image passes through the transfer portion, said executing portion being capable of selectively executing an operation in a first mode in which image formation is executed at a first speed and an operation in a second mode in which the image formation is effected at a speed slower than the first speed; and a setting portion for setting a falling time from transfer voltage falling start timing toward the returning voltage until a current flowing through said transfer member is zero, wherein said setting portion sets the falling time in the operation in the second mode so as to be longer than the falling time in the operation in the first mode. |
