| 摘要 |
PURPOSE:To prevent a shadow when forming a picture by setting a picture forming magnification of an original of the time of a both-side copying mode of an image forming device having the copying modes of both sides and one side, to <=1.02 times an original picture forming magnification of the time of one-side copying mode. CONSTITUTION:A motor 31 for lens is used for moving a position of a lens block 8 for executing a variable power, and this motor 31 is constituted so as to move the position of the lens block 8, for instance, so that the copying magnification becomes 1.02 times and 1.00 times in case when the first range and the second range on an original placing plate 2 are exposed continuously and successively, and in case when only the first range is exposed, respectively. Also, a motor 32 for mirror is used for changing a distance between a mirror 5 and mirrors 6, 7 for executing a variable power, that is to say, an optical path length, and a scanning motor 33 is used for moving the mirror 5 and the mirrors 6, 7 in order to scan an original. |
