| 摘要 |
PURPOSE:To execute exactly light shielding of a flare by forming at least one of a fixed light shielding plate and a movable light shielding plate with an elastically deformable plate material. CONSTITUTION:A variable power copying machine having an invariable conjugate length, in which a main lens 6 moves by a prescribed range in the optical axis direction, and with respect to each magnification, one prescribed piece of additional lenses 7, 8, 9 and 10 can go in and out of an optical path so that the main lens 6 and the optical axis coincide with each other is shown in the figure. An original moving on an original guide glass 1 is irradiated from a light source, and its reflected light is reflected by the first mirror 2 and the second mirror 3 which are fixed, focused by the main lens 6, and one of the additional lenses 7-10 brought onto the optical axis, reflected by the third mirror 4 and the fourth mirror 5 which are fixed, and an image is formed on a photosensitive body 12. |
