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Proximity warning system with silent zones

  • US 8,810,390 B2
  • Filed: 05/20/2013
  • Issued: 08/19/2014
  • Est. Priority Date: 10/25/2007
  • Status: Active Grant
First Claim
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1. A method for providing a proximity warning comprising:

  • generating a plurality of magnetic fields, wherein the plurality of magnetic fields define a warning zone in which a warning is to be issued and a silent zone in which a warning is not to be issued, wherein at least one of the warning zone and the silent zone have a shape that is different than a shape of the individual magnetic fields;

    determining a location of a detector device with respect to the warning zone and silent zone, wherein the location is determined by detecting at least one of the plurality of magnetic fields using the detector device;

    determining whether a warning is to be issued based on whether the detector device is located in the warning zone or the silent zone; and

    if it is determined to issue a warning, issuing the warning.

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