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    Portable laser scanning arrangement for and method of evaluating and validating bar code symbols
    9.
    发明授权
    Portable laser scanning arrangement for and method of evaluating and validating bar code symbols 失效
    便携式激光扫描装置以及评估和验证条码符号的方法

    公开(公告)号：US4251798A

    公开(公告)日：1981-02-17

    申请号：US911171

    申请日：1978-05-31

    申请人： Jerome Swartz ,  Shelley A. Harrison ,  Edward Barkan ,  Frank Delfine ,  George Brown

    发明人： Jerome Swartz ,  Shelley A. Harrison ,  Edward Barkan ,  Frank Delfine ,  George Brown

    IPC分类号： G06K7/10 ,  G06K9/24

    CPC分类号： G06K7/10871 ,  G06K7/10881

    摘要： Laser light reflected from a bar code symbol pattern is detected by a photodetector mounted in a portable scanning head of a laser scanning system. By selecting appropriate threshold values on the analog signal generated by the photodetector, the analog signal is converted to a series of pulses, each pulse width accurately corresponding to the width of a bar from the scanned pattern. A plurality of functions can be determined from the series of pulses, each function being independently selected by keyboard entry from the head, displayed on the head, and/or recorded by a printer remote from the head. Single line or multiple line scans in two orthogonal directions relative to the pattern may be selected. A bimorph or speaker-type oscillatory element may be utilized as a miniature scanning element. Circuitry for synchronizing scanning along both axes, and for generating a signal to drive the bimorph in a uniform, constant velocity manner is also disclosed.

    摘要翻译： 由条形码符号图案反射的激光由安装在激光扫描系统的便携式扫描头中的光检测器检测。 通过对由光电检测器产生的模拟信号选择适当的阈值，将模拟信号转换成一系列脉冲，每个脉冲宽度与扫描图案的条宽度精确对应。 可以从一系列脉冲确定多个功能，每个功能通过从头部的键盘输入独立地选择，显示在头部上，和/或由远离头部的打印机记录。 可以选择相对于图案的两个正交方向的单行或多行扫描。 双压电晶片或扬声器型振荡元件可以用作微型扫描元件。 还公开了用于沿着两个轴同步扫描并且用于产生以均匀的恒定速度方式驱动双压电晶片的信号的电路。