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    • 6. 发明授权
    • Parallelepiped-shaped optical scanning module
    • 平行六面体形光学扫描模块
    • US5589679A
    • 1996-12-31
    • US575662
    • 1995-12-19
    • Paul DvorkisHoward Shepard
    • Paul DvorkisHoward Shepard
    • G06K7/10
    • G06K7/10871G06K7/10564G06K7/10584G06K7/10633G06K7/10643G06K7/10653G06K7/10673G06K7/10693G06K7/10811G06K7/10851G06K7/10881G06K7/10891G06K7/109G06K7/1098G06K2207/1011G06K2207/1016G06K2207/1018
    • An optical scanning module has a metal base, a first circuit board mounted across one end of the metal base and a second circuit board mounted orthogonal to the first circuit board. The metal base supports a light emitter for producing a scanning beam and serves as a heat sink for the emitter. A flexible support attached to the metal base supports a mirror for oscillating motion. The module includes a drive mechanism, typically in the form of a permanent magnet and electromagnet, for producing reciprocal motion of the mirror. A detector included in the module senses light reflected from an indicia scanned by the beam. A flexible electrical cable connects the circuitry on the first and second circuit boards so that circuitry operates together to produce all signals necessary for operation of the scanner module and to process the electrical signals from the detector. Preferred embodiments include a flexible support consisting of a planar spring located between the mirror and one of the magnets. The components of the module are dimensioned so that the weight of the magnet balances that of the mirror. The invention also encompasses systems for scanning the beam simultaneously in two orthogonal directions at two different frequencies. This bi-directional scanning can produce a raster scan pattern for reading two-dimensional bar codes, or this scanning can produce a moving zig-zag pattern for reading truncated bar codes.
    • 光学扫描模块具有金属基座,安装在金属基底的一端的第一电路板和与第一电路板垂直安装的第二电路板。 金属底座支撑用于产生扫描光束的光发射器,并且用作发射器的散热器。 附接到金属基座的柔性支撑件支撑用于振动运动的反射镜。 模块包括通常为永磁体和电磁体形式的驱动机构,用于产生反射镜的往复运动。 包括在模块中的检测器感测由光束扫描的标记反射的光。 柔性电缆连接第一和第二电路板上的电路,使得电路一起工作以产生操作扫描器模块所需的所有信号并处理来自检测器的电信号。 优选实施例包括由位于反射镜和一个磁体之间的平面弹簧组成的柔性支撑件。 模块的组件的尺寸使得磁体的重量平衡了镜子的重量。 本发明还包括用于在两个不同频率的两个正交方向同时扫描光束的系统。 该双向扫描可以产生用于读取二维条形码的光栅扫描图案,或者该扫描可以产生用于读取截断的条形码的移动之字形图案。