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    • 4. 发明授权
    • Copying apparatus
    • 复印机
    • US5227845A
    • 1993-07-13
    • US773798
    • 1991-10-09
    • Susumu HiranumaKoji FukushimaYoshihiro Maekawa
    • Susumu HiranumaKoji FukushimaYoshihiro Maekawa
    • G03G15/04G03B27/73G03G15/00G03G15/043
    • G03G15/5025G03G15/0435
    • An apparatus for performing a copying operation contains a photosensitive drum, a focusing optical system for directing reflected light from an original image onto the photosensitive drum, a lamp for lighting the original image, a light quantity sensor for detecting the quantity of reflected light from the original image and for controlling the quantity of light of the lamp on the basis of the detected value of the quantity of reflected light, a first filter provided in an optical path of the focusing optical system so as to cut-off light having a wavelength not longer than a predetermined value, and a second filter provided on a light-detection surface of the light quantity sensor. The second filter has a cut-off wavelength point shorter than the first filter.
    • 用于执行复印操作的装置包括感光鼓,用于将来自原始图像的反射光引导到感光鼓上的聚焦光学系统,用于点亮原始图像的灯,用于检测来自该图像的反射光量的光量传感器 基于反射光量的检测值控制灯的光量,设置在聚焦光学系统的光路中的第一滤光器,以便截止具有波长的波长的光 长于预定值,以及设置在光量传感器的光检测表面上的第二滤光器。 第二滤光器具有比第一滤光片短的截止波长点。