| 摘要 |
PURPOSE:To enable enlargement with a variable power range by providing a both-sided reflecting mirror which is moved off an optical path in unmagnification copying operation and inserted at a crossing position at an angle bisecting the angle of intersection of two optical path parts when a projection lens is displaced beyond the crossing position. CONSTITUTION:When a unmagnification copy is taken, reflected light from an original 10 is projected on a photosensitive body 7 through the path of mirrors 1 and 3, the projection lens L at a solid-line position, and mirrors 4 and 6. Here, the optical path part from the original 10 to the mirror 10 and the optical path from the mirror 3 to the projection lens L cross each other. When a copy with high enlargement magnification is taken, the projection lens is moved forth from the solid-line position 8 at the time of the unmagnification copying operation to a dotted-line position 8' beyond the crossing position of the optical path parts and the both-sided reflecting mirror 11 which is moved off the optical path at the time of the unmagnification copying operation is arranged behind the projection lens at the angle bisecting the angle of intersection at the crossing position after the projection lens is moved. Consequently, the variable power range is widened. |
