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    • 75. 发明授权
    • Portable optical reader with motion sensing system and method
    • 便携式光学读取器,具有运动感应系统和方法
    • US5534684A
    • 1996-07-09
    • US311483
    • 1994-09-23
    • Arvin D. Danielson
    • Arvin D. Danielson
    • G06K7/10
    • G06K7/10881G06K7/10693G06K2207/1011
    • A portable terminal unit of tablet configuration contains an optical reader for scanning two-dimensional information on a target area. The terminal unit has an optical window near an underside thereof and contains an optical reader having a given depth of field and field of view at a given range from the window. The apparatus includes a ranger for operably determining the range of the target area from the terminal unit and a controller for operably controling activation of the reader. The controller may be configured to permit activation of the reader as: the target area is spaced within a certain tolerance range about an optimal focal length from the reader; the target area is spaced within the depth of field of the reader and motion of the terminal unit relative to the target area is halted; or the target area is spaced within the depth of field of the reader and motion of the terminal unit relative to the target area is reversed.
    • 平板电脑配置的便携终端单元包括用于扫描目标区域上的二维信息的光学读取器。 终端单元在其下侧附近具有光学窗口,并且包含具有从窗口的给定范围内的给定景深和视场的光学读取器。 该装置包括用于可操作地确定来自终端单元的目标区域的范围的巡程器和用于可操作地控制读取器的激活的控制器。 控制器可以被配置为允许读取器的激活,因为:目标区域在与读取器的最佳焦距之间在一定的公差范围内间隔开; 目标区域在读取器的景深内间隔开,终端单元相对于目标区域的运动被停止; 或者目标区域在读取器的景深内间隔开,并且终端单元相对于目标区域的运动被反转。