| 摘要 |
PURPOSE:To change the magnification without moving an optical element, by providing a plurality of lenses having different magnification between a reading position and a photodetection position in a reader of original and selecting the optical system of the lenses with a shutter. CONSTITUTION:The reflected light from the original illuminated with a lamp at the reading position R is refracted by 90 deg. on a reflection mirror 5, collected with a lens 6 or 7 and the image of the original is projected on the photodetection position. The lenses 6, 7 provided between the reading and the photodetecting positions are used for the equal magnification mode and the magnification mode, fixed with holders 9, 10, the optical axis of the lenses 6, 7 is made incident to different positions of a photodetector 11, and original guides 20a, 20b are provided to change the position of the original accordingly. The shutter 18 for the selection of the lenses is supported with a cord 18a and switched left and right by operating a changeover lever 19. |
