| 摘要 |
PURPOSE:To perform stepless magnification variation through one fixed-focus lens by making a fine adjustment of the overall length of the optical path from an original to a photosensitive body as interlocked with variation in the ratio of the optical path length from the original to the lens and the optical path length from the lens to the photosensitive body. CONSTITUTION:When the 1st block 10 is displaced in a direction (d), the ratio of the length of the optical path extending from the original 1 to the lens 7 through the 1st mirror 2 and the 2nd mirror 3 to the length of the optical path from the lens 7 to the photosensitive body 6 through the 3rd mirror 4 and the 5th mirror 5 varies. A cam follower 11 moves along a cam 12 associatively to move the 2nd block 8 which mounts the 2nd mirror 3, lens 7, and the 3rd mirror 4 along a rail 9 in a direction (c), and then the overall length of the optical path from the original 1 to the photosensitive body 6 is adjusted finely to form an original image on the photosensitive surface correctly. |
