| 摘要 |
PURPOSE:To favorably correct the deviation in a focusing point caused by the color astigmation characteristic of a lens by executing a color correction different from a usual magnification correction concerning a prescribed color filter, especially, whose deviation in the focusing position is large among plural color filters. CONSTITUTION:If the prescribed filter R is inserted into an optical path, an interlocking part 80a is pushed and an interlocking spring member 80 is rotated around an axis 81, and then a cam lever 37 is turned counterclockwise through an interlocking projection 82. Since a cam follower 40 abuts on a cam surface 41R for R, the lens L2 of a back group is moved on a moving locus this time. Then, the deviation in the focusing position by the respective color filters can be favorably corrected. Since color separation of the respective filters such as M, B, G and R is executed with one rotation of an endless belt the latent image by all the colors can be formed on a photosensitive drum and the developing of the image can be executed on a same substance to be transferred (paper). And if fixing is completed, a color copy where the deviation in the focusing position caused by the difference of color is removed can be obtained. |
