| 摘要 |
PURPOSE:To realize the variable power of an image without requiring a wide space by a small number of parts, by providing an inclining means, a sliding means, and an optical path changing means. CONSTITUTION:An optical system 2 is constituted of a lamp 21, the first mirror 3, a lens 4, and the second mirror 5. Also, under the mirror 5, a photosensitive drum 6 is provided so as to be freely rotatably. On the other hand, the optical system 2 is provided on an optical system base 7. The lens 4 is attached to a lens base 8, and the base 8 is slid by a sliding means A. That is to say, one end side of the base 8 is screwed to a spiral shaft 9, and also the other end is supported by a rail 10 so as to be freely slidable. One end part of the shaft 9 is connected to a motor 11, and brought to forward and backward rotations by its operation. The base 8 is moved in the directions (c), (d) by the forward and backward rotations of the shift 9. Also, the base 7 is inclined B. That is to say, a shaft 12 is connected to the center part of the base 7, and it is supported so as to be freely turnable by a supporting means. |
