| 摘要 |
PROBLEM TO BE SOLVED: To obtain satisfactory transfer to a recording material having a rugged surface even in a portion where the image area is small.SOLUTION: An image forming apparatus comprises: a transfer member 36 that is in contact with a surface 31a of an image carrier 31 carrying a toner image to form a transfer nip N; and transfer bias output means 39 that outputs a voltage to transfer the toner image on the image carrier to a recording material P inserted into the transfer nip, where when transferring the toner image on the image carrier to the recording material, the transfer bias output means applies a voltage that is switched alternately between a voltage in a transfer direction to transfer the toner image from the image carrier to the recording material and a voltage in a returning direction having a polarity reverse to that of the voltage in the transfer direction. When the average value of the voltage alternately applied during printing is Vdc, and when changing Vdc according to the image area ratio of the toner image to be printed, the image forming apparatus decreases Vdc as the image area ratio is larger and increases a target value Vdc1 of Vdc as the image area ratio is smaller.SELECTED DRAWING: Figure 6 |
