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    • 20. 发明授权
    • Document reading apparatus having a white platen roller
    • 具有白色压纸辊的文件读取装置
    • US06295140B1
    • 2001-09-25
    • US09104809
    • 1998-06-25
    • Kenji Kameyama
    • Kenji Kameyama
    • H04N140
    • H04N1/401
    • A document reading apparatus that includes a white platen roller and image sensor positioned at an image reading portion of the apparatus. The white platen roller is used to provide white reference data used for shading correction when reading an original document. The image sensor selectively reads the white platen roller and outputs signal characteristic data after reading the white platen roller. The apparatus also includes a controller configured to control the reading of the white platen roller so that the image sensor reads the white platen roller a predetermined number of times. The controller also controls movement of the white platen roller so that a motor used to move the white platen roller is de-energized when the image sensor reads the white platen roller. The controller receives the output signal characteristic data from the image sensor and compares the read output signal characteristic data to pre-existing signal characteristic data to determine if an abnormality exists in the read output signal characteristic data. When an abnormality is determined, the read output signal characteristic data is not used as white reference data but when no abnormality is determined the controller stores in memory the output signal characteristic data as white reference data.
    • 一种文件读取装置,包括位于设备的图像读取部分的白色压纸辊和图像传感器。 白色压纸辊用于提供读取原始文档时用于阴影校正的白色参考数据。 图像传感器选择性地读取白色压纸辊并在读取白色压纸辊之后输出信号特征数据。 该装置还包括控制器,其被配置为控制白色压纸辊的读取,使得图像传感器将白色压纸辊读取预定次数。 控制器还控制白色压纸辊的移动,以便当图像传感器读取白色压纸辊时,用于移动白色压纸辊的电机断电。 控制器从图像传感器接收输出信号特性数据,并将读出的输出信号特性数据与预先存在的信号特性数据进行比较,以确定读出的输出信号特性数据中是否存在异常。 当确定异常时,读取的输出信号特性数据不用作白色参考数据,但是当没有确定异常时,控制器将输出信号特征数据作为白色参考数据存储在存储器中。