Patent ID: 9665044
Date: 2017-05-30
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: a latent image bearing body on which a latent image is formed; a lubricant supplying unit configured to supply lubricant to the latent image bearing body; a developing unit configured to develop the latent image as a toner image by supplying the lubricant taken in from the latent image bearing body to the latent image bearing body together with charged toner; a transfer unit configured to transfer the toner image to an image bearing medium at a transfer position by applying a transfer voltage to the toner image developed by the developing unit; and a control unit configured to control application of the transfer voltage at the transfer position, wherein the lubricant is charged to a polarity opposite to a charging polarity of the charged toner at the transfer position, and based on an area ratio of a transferred image over an entire sheet and a number of transferred sheets at a certain timing, the control unit controls the transfer voltage to be applied at a time of transfer of the toner image after the certain timing.