| 摘要 |
PURPOSE:To correct projection illuminance by providing the variable power system of a copying system which uses auxiliary lenses with optical path specifying members integrally with the auxiliary lenses. CONSTITUTION:While a main lens is moved, the auxiliary lenses are inserted for the variable power of the copying machine; a lens 11 for enlargement as an auxiliary lens is fitted to the opening part 41 of a holding member and an optical path specifying member 81 makes the light transmission area smaller at the center part than at end parts. A lens 13 for reduction is fitted to a support frame 31 similarly and an optical path specifying member 82 makes the light transmission area smaller at end parts than at the center part, so when the auxiliary lenses 11 and 13 are put on the optical path, the optical path specifying members 81 and 82 makes corrections so that projection illuminance has no unevenness. |
