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    • 8. 发明公开
    • Image reading apparatus and image reading system
    • Bildlesevorrichtung und -verfahren
    • EP0822706A2
    • 1998-02-04
    • EP97113358.2
    • 1997-08-01
    • CANON KABUSHIKI KAISHA
    • Tabata, MasamiKawai, Tatsundo
    • H04N1/48
    • H04N1/484
    • In an image sensor which has a photoelectric conversion element group, an illumination device having light sources of at least three emission colors R, G, and B, an imaging lens, and the like, moiré noise in a color output image is eliminated, the original reading time is shortened, and a cost reduction is attained. For this purpose, a sensor array (1) including a linear array of a plurality of photoelectric conversion elements, a lens array (2) for imaging an original image on the sensor array (1), an illumination device (3) using LEDs having emission colors R, G, and B, and a cover glass (4) are supported by and fixed to a frame (5). The conjugate length of the lens array (2) is set to fall within the range between the B and G emission wavelengths. An original pressed against the cover glass (4) is illuminated by the illumination device (3), and light reflected by the original is converted into electrical signals by the sensor array (1), thereby reading the original image.
    • 在具有光电转换元件组的图像传感器中,消除了具有至少三种发光颜色R,G和B的光源的照明装置,成像透镜等,消除了彩色输出图像中的莫尔噪声, 原始阅读时间缩短,降低成本。 为此,包括多个光电转换元件的线性阵列的传感器阵列(1),用于对传感器阵列(1)上的原始图像进行成像的透镜阵列(2),使用LED的照明装置(3) 发射颜色R,G和B以及盖玻璃(4)由框架(5)支撑并固定在框架(5)上。 透镜阵列(2)的共轭长度被设定在B和G发射波长之间的范围内。 按压在玻璃罩(4)上的原稿由照明装置(3)照亮,由原稿反射的光由传感器阵列(1)转换为电信号,从而读取原始图像。