| 摘要 |
PURPOSE:To reduce the driving force and enhance the operation reliability, by adopting the shaking system for a mirror device instead of conventional sliding systems. CONSTITUTION:The shape of a cam 22 is so set that the center of a cam follower 21 of a mirror holding member 30 describes a locus parallel with the locus of movement of the center of a shaft 16. That is, the cam 22 is so shaped that the center of the cam follower 21 is shaked around a point 32 which constitutes a parallelogram together with the center of a driving shaft 19, the center of the shaft 16, and the center of the cam follower 21. The inclined posture of a mirror holding member 30 is kept constant even when the member is moved from the unmagnification position indicated by a solid line to the variable power position indicated by a broken line, and the member 30 directs the optical image from a lens 5 toward a photoreceptor 8 through mirrors 6 and 7. |
