| 摘要 |
PURPOSE:To simplify structure and to enhance precision as well as to reduce cost, by allowing the region of movement of a zoom lens system in size enlarging, and the region of movement of half-speed mirrors in same size copying and size reducing to overlap each other. CONSTITUTION:The optical system, for copying in variable magnification, such as enlarging or reducing size, to be used consists of full-speed mirror 6 for scanning a given copy size, the following half-speed mirrors 7, 8, and the following zoom lens system 9. In equal size copying, the interval between the scanning ends of mirrors 7, 8 and zoom lens system 9 is ensured at the minimum so as not to contact each other, and the movement region of system 9 in size enlarging is arranged to overlap the scanning region of mirrors 7, 8 in size unchanging and reducing, thus permitting enlarging the whole apparatus to be suppressed and magnification copying mechanism to be effectively simplfied. |
