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Flap-type portal reader

  • US 5,221,831 A
  • Filed: 11/29/1991
  • Issued: 06/22/1993
  • Est. Priority Date: 11/29/1991
  • Status: Expired due to Term
First Claim
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1. Apparatus for automatically reading a passive transponder type tag, which is responsive to receipt of a magnetic exciting field of a first predetermined frequency to produce at least one of a magnetic and an electrostatic field of a second different predetermined frequency modulated by a digitally coded identifying signal, while the tag is attached to a object moving along a given pathway;

  • said apparatus comprising;

    means for producing a magnetic exciting field of said first predetermined frequency along a portion of the length of the pathway;

    a curtain, formed of a plurality of flexible flaps of non-conductive material, suspended from above said portion of said pathway and extending across said pathway, with said plurality of flaps being positioned, and being of a length, such that at least one of said flaps will be contacted and deflected by an object having an attached transponder moving along said pathway;

    at least one of an electrostatic field receiving antenna and a magnetic field receiving antenna disposed in each of said flaps; and

    means connected to each of said receiving antennas for receiving and decoding a signal of the second predetermined frequency received by the respective said antennas.

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