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Object detection system

  • US 20020027509A1
  • Filed: 03/29/2001
  • Published: 03/07/2002
  • Est. Priority Date: 09/01/2000
  • Status: Abandoned Application
First Claim
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1. An object detection system including a detection device for detecting objects present in unspecified places based on radio signals, said object detection system comprising:

  • a first transmitting and receiving section provided on said detection device for transmitting and receiving a radio signal; and

    a second transmitting and receiving section provided on each of said objects to be detected for transmitting and receiving a radio signal;

    wherein when said first transmitting and receiving section of said detection device transmits a radio signal for detecting said object, said second transmitting and receiving section of each of said objects receives said radio signal transmitted from said first transmitting and receiving section and sends a radio signal representative of response information to said detection device when an electric field level of said radio signal received by said second transmitting and receiving section is equal to or greater than a predetermined value; and

    said detection device detects the presence of said objects by judging from an electric field level of each of said radio signals received and the content of said response information received.

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