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    • 5. 发明授权
    • Image scanning device
    • 图像扫描装置
    • US5859427A
    • 1999-01-12
    • US879142
    • 1997-06-19
    • Mikio HorieMinoru Suzuki
    • Mikio HorieMinoru Suzuki
    • G02B26/10H04N1/04H04N1/113H04N1/193H01J3/14
    • H04N1/02409H04N1/113H04N1/193H04N2201/0438
    • An image scanning device is provided for reading an image of an object. The image scanning device includes: a linear image sensor outputting an image signal corresponding to a received image; an imaging lens positioned between the object and the image sensor; a scanning system rotatable through a predetermined scanning range around a predetermined axis parallel to the line of image receiving elements to scan an image of the object onto the image sensor; a focusing system for adjusting a focusing condition of the image scanning device; and a controller which, based on an image signal from the image sensor, adjusts the focusing system to set an in-focus focusing condition for a portion of the object located at a substantially central portion of the scanning range. The image scanning system may be set to the center of the scanning range and the controller, using image signals from the image sensor, may monitor the contrast of the image while adjusting the position of the imaging lens until the contrast is maximum.
    • 提供用于读取对象的图像的图像扫描装置。 图像扫描装置包括:线性图像传感器,输出与接收图像对应的图像信号; 位于物体和图像传感器之间的成像透镜; 扫描系统,其绕预定轴线旋转,围绕与图像接收元件线平行的预定轴扫描,以将物体的图像扫描到图像传感器上; 用于调整图像扫描装置的聚焦状态的聚焦系统; 以及控制器,其基于来自图像传感器的图像信号调整聚焦系统以对位于扫描范围的大致中心部分的物体的一部分设置对焦聚焦条件。 图像扫描系统可以设置为扫描范围的中心,并且使用来自图像传感器的图像信号的控制器可以在调整成像透镜的位置直到对比度最大时监视图像的对比度。