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    • 10. 发明授权
    • Article identification apparatus and method using a ferromagnetic tag
    • 使用铁磁标签的物品识别装置和方法
    • US5241163A
    • 1993-08-31
    • US719847
    • 1991-06-24
    • George J. VachtsevanosKent Davey
    • George J. VachtsevanosKent Davey
    • G06K7/08
    • G06K7/084
    • Information is encoded on tags preferably in a form emulating conventional bar coding, in which ferromagnetic strips correspond to bars and nonferromagnetic spaces correspond to the absence of bars. The tags thus can be embedded within an article or otherwise concealed from visual scanning or inspection. The tags are read by scanning with a magnetic reader including an excitation coil and a pickup coil. Relative movement between the tags and the scanner induces a signal in the pickup coil only when a bar is scanned, so that the phase and timing of the induced signals contain information corresponding to the relative placement and width of the ferromagnetic bars and strips. Those signals are processed to provide an output signal emulating the output from a conventional optical bar code scanner.
    • 信息被编码在标签上,优选地以模拟常规条形码的形式编码,其中铁磁条对应于条,并且非铁磁空间对应于不存在条。 因此,标签可以嵌入在物品内或以其它方式隐藏在视觉扫描或检查中。 通过使用包括励磁线圈和拾取线圈的磁性读取器扫描来读取标签。 标签和扫描仪之间的相对运动仅在扫描条形时才引起拾取线圈中的信号,使得感应信号的相位和定时包含对应于铁磁条和条带的相对位置和宽度的信息。 处理这些信号以提供仿真来自常规光学条形码扫描器的输出的输出信号。