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    • 6. 发明授权
    • Apparatus and method for scanning a symbol using an intelligent laser
focus control
    • 使用智能激光聚焦控制扫描符号的装置和方法
    • US6095421A
    • 2000-08-01
    • US183523
    • 1998-10-30
    • Edward BarkanRaj BridgelallJean TuYuri GofmanJoseph GiordanoEdmond L. Fratianni
    • Edward BarkanRaj BridgelallJean TuYuri GofmanJoseph GiordanoEdmond L. Fratianni
    • G06K7/10
    • G06K7/10811G06K7/1092G06K2207/1011G06K2207/1018
    • A laser focus control system including a laser for generating a scanning light beam to visually illuminate an information encoded bar code symbol. A segmented photodiode detects light reflected from the symbol and generates a plurality of electrical signals, each signal based on the light energy incident on the segments of the photodiode, thereby representing the spatial intensity variations of the symbol. A scanning zone processor then filters, averages, and compares the electrical signals to a noise threshold, and assigns logic levels based on the comparisons. Thereafter, a scanning zone detector determines the corresponding scanning zone distance based on the combination of logic levels and determines whether the system has stabilized within the zone distance. The scanning zone distance is then furnished to the laser focus controller in order to adjust the laser focus of the scanning device. The system is incorporated in a shock-resistant hand-held device.
    • 一种激光对焦控制系统,包括用于产生扫描光束以在视觉上照亮信息编码的条形码符号的激光器。 分段光电二极管检测从符号反射的光并产生多个电信号,每个信号基于入射到光电二极管的光束上的光能,从而表示符号的空间强度变化。 扫描区域处理器然后对电信号进行滤波,平均和比较,并将噪声阈值进行比较,并根据比较分配逻辑电平。 此后,扫描区域检测器基于逻辑电平的组合来确定相应的扫描区域距离,并且确定系统是否在区域距离内稳定。 然后将扫描区距离提供给激光对焦控制器,以便调整扫描装置的激光焦点。 该系统结合在防震手持装置中。