| 摘要 |
PROBLEM TO BE SOLVED: To obtain a proper both-surface image even on different conditions by executing the mirror-image rotation of an original image on a stage that the toner image of a back surface is formed when the effective image area of the original image and that of a transfer material are in identical directional relation. SOLUTION: When the effective image area of the original image is in the identical directional relation with respect to that of the transfer material at the back-surface image forming time, at the time of forming the toner image on the transfer material, the mirror-image rotation of the original image is executed on the stage that the toner image of the back surface is formed in a data selector (I) B17. The image data of the front surface accessed from a memory B14 is processed by an image processing part (II) B16 and rotated by 90 deg. by the selector (I) B17. Thereafter, it is inputted to a memory for outputting front-surface image data B18A. Next, the mirror-image rotation processing or the (mirror-image + 90 deg.) rotation processing of the image data of the back surface is executed according to the condition. Thereafter, it is inputted to a memory for outputting back-surface image data B18B. Then, the image data of the back surface is outputted to an exposure unit 12 and the back-surface image is formed on a photoreceptor drum 10. Next, the front-surface image is formed. |
