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    • 8. 发明授权
    • Image reader
    • 图像阅读器
    • US06559978B1
    • 2003-05-06
    • US09514148
    • 2000-02-28
    • Hidetaka Hama
    • Hidetaka Hama
    • H04N136
    • H04N1/00931H04N1/047H04N1/1013H04N1/193H04N2201/0081H04N2201/02439H04N2201/0471H04N2201/04748H04N2201/04755H04N2201/04767H04N2201/04794
    • An image reader provided with an image pick-up unit which reads an image in a fast scanning direction in accordance with a fast scanning synchronizing signal, a drive unit which causes the image pick-up unit to move in a slow scanning direction in accordance with a drive control signal asynchronous with the fast scanning synchronizing signal, an intermittent read instruction unit which generates a stop instruction and a restart instruction for allowing the image reading to be performed intermittently by the image pick-up unit, a phase holding unit which, upon issuance of a stop instruction, recognizes and holds a phase difference between the fast scanning synchronizing signal and the drive control signal, and a phase control unit which, upon issuance of a restart instruction, corrects a phase difference between the fast scanning synchronizing signal and the drive control signal on the basis of the phase difference recognized and held by the phase holding unit. According to this image reader, the occurrence of an image quality trouble such as an image displacement at an image joint portion is prevented in an intermittent image data reading operation.
    • 一种图像读取器,其具有:图像拾取单元,其根据快速扫描同步信号以快​​速扫描方向读取图像;驱动单元,其使得图像拾取单元按照扫描方向沿慢扫描方向移动; 与快速扫描同步信号异步的驱动控制信号,产生停止指令的间歇读取指令单元和用于允许由图像拾取单元间歇执行图像读取的重新启动指令;相位保持单元, 发出停止指令,识别并保持快速扫描同步信号和驱动控制信号之间的相位差;以及相位控制单元,其在发出重新启动指令时,校正快速扫描同步信号和驱动控制信号之间的相位差 基于由相位保持单元识别并保持的相位差的驱动控制信号。 根据该图像读取器,在间歇图像数据读取操作中,防止图像接合部处的图像质量故障的发生。