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Transponder reading transducer to control passages

  • US 6,567,002 B2
  • Filed: 06/26/2001
  • Issued: 05/20/2003
  • Est. Priority Date: 09/08/2000
  • Status: Expired due to Term
First Claim
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1. A card transponder reading transducer for controlling passages by reading the contents of an inductive card transponder assigned to the people or objects transiting through the passages, comprising:

  • an elongated three-dimensional column-shaped structure (1) with circular or elliptic cross section for supporting a plurality of electric coils;

    means (2) to anchor the elongated three-dimensional column-shaped structure to the floor, on the ceiling or on the wall near the passage to be controlled; and

    at least one transmitter (Tx) homopolar electric coil and at least on receiver (Rx) multipolar electric coils supported by the elongated three-dimensional column-shaped structure.

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