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Data card with inductive signal transfer device

  • US 4,818,853 A
  • Filed: 05/26/1987
  • Issued: 04/04/1989
  • Est. Priority Date: 05/26/1986
  • Status: Expired due to Term
First Claim
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1. A data card having a planar surface which can be resiliently flexed to a degree comprising:

  • a laminated structure member having at least a synthetic resin protective layer and a ferromagnetic material layer;

    an electric circuit device embedded in the laminated structure member;

    an electro-magentic transducer having a pair of coils including a first coil and a second coil which are formed on the laminated structure member, the pair of coils being coupled to the electric circuit device for generating magnetic fluxes of opposite directions with each other according to an information signal supplied from the electric circuit device; and

    the magnetic flux generated by the first coil flowing in one direction vertical to the surface of the card at the center of first coil and the magnetic flux generated by the second coil flowing in an opposite direction vertical to the surface of the card at the center of the second coil forming a loop of magnetic flux.

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