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Detector and lock controller using same

  • US 20060250214A1
  • Filed: 07/13/2006
  • Published: 11/09/2006
  • Est. Priority Date: 01/20/2003
  • Status: Abandoned Application
First Claim
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1. A detector for detecting a target object approaching and retreating, said detector comprising:

  • an oscillator device for generating a transmission wave;

    a branching device for branching said transmission wave generated by said oscillator device;

    a transmission device for transmitting said transmission wave into space as electromagnetic waves;

    a reception device for receiving the transmission wave transmitted by said transmission device and reflected by said target object;

    a mixer for mixing a reception signal received by said reception device and a branched signal branched by said branching device to output a mixed signal;

    a judging device for switching on a detection output indicating said object approaching and retreating based on an increase and a decrease of said mixed signal outputted from said mixer;

    wherein a detection distance is set within ¼

    wavelength of frequency effective for the detection.

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