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    • 10. 发明公开
    • Electrostatic copying apparatus
    • 静电复印设备
    • EP0296308A1
    • 1988-12-28
    • EP88102181.0
    • 1982-11-04
    • MITA INDUSTRIAL CO. LTD.
    • Yoshioka, MasahiroMurakami, MasahiroIrie, YoichiroNakanishi, TsugioTsutsui, Eiji Yamada Heights 202Iwao, NoriyukiHirobe, JunichiWakikaido, Takahiro
    • G03G15/052
    • G03G15/0415G03G15/041
    • The electrostatic copying apparatus according to the invention is adapted for copying at variable ratios and has an optical device for performing slit exposure scanning of an original document and for pro­jecting its image onto a photosensitive member. The distribution of the illuminance of a document illumi­nating lamp (70) in the widthwise direction is pre­scribed such that when a lens (78) is held at the equal scale position, the decaying characteristics of the lens in the widthwise direction are offset to render the illuminance distribution in the widthwise direction on the photosensitive member (10) sub­stantially uniform, and when the lens is held at the predetermined ratio position, an exposure adjusting plate (150) is positioned partly in a light path leading from the document to the photosensitive member (10), said exposure adjusting plate (150) being adapted for compensating variations in illuminance on the photosensitive member (10) which are ascribable to the displacement of the optical axis in the width­wise direction caused by the movement of the lens (78) from the equal scale position to the pre­determined ratio position and to variations in the degree of focusing on the photosensitive member (10) caused by the change of the projecting ratio and also to variations in the speed of slit exposure scanning.
    • 根据本发明的静电复印设备适合于以可变比例复印,并且具有用于对原始文件执行狭缝曝光扫描并将其图像投影到感光构件上的光学装置。 文件照明灯(70)在宽度方向上的照度的分布被规定为使得当透镜(78)被保持在等比例位置时,透镜在宽度方向上的衰减特性被抵消以致使 (10)上的宽度方向上的照度分布基本均匀,并且当透镜保持在预定比率位置时,曝光调节板(150)部分地定位在从文件到光敏元件的光路中 (10),所述曝光调节板(150)适于补偿由于所述透镜(78)的移动引起的所述光轴在所述宽度方向上的位移而导致的所述感光构件(10)上的照度变化, 等比例位置到预定比例位置以及由ch引起的感光构件(10)上的聚焦度的变化 投影比例的急剧变化以及狭缝曝光扫描速度的变化。