| 摘要 |
PURPOSE:To change the magnification of projection with a simple structure by moving a photosensitive body and a reflector at a fixed speed and moving only a projection lens system according to magnification in changing the magnification of projection. CONSTITUTION:The relation between the circumferential speed V of a photosensitive drum 11 and the moving speed V/2 of right angle mirrors 15 is constant irrespective of the magnification of projection of a lens 14, and the change of magnification of the lens can be made freely by keeping the speed of the right angle mirrors 15 constant. Exposure of the same projected image on the photosensitive drum 11 using a large-frame film 13 can be achieved by making the magnification as desired by changing the lens 14 to a lens 14' of longer focal length. |
