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Method of making electrical connections between opposing metal foils having a flexible, insulating layer sandwiched therebetween

  • US 4,541,559 A
  • Filed: 11/16/1983
  • Issued: 09/17/1985
  • Est. Priority Date: 11/16/1983
  • Status: Expired due to Term
First Claim
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1. A method of forming a marker for use in an electronic article surveillance system, wherein said marker comprises a circuit resonant at at least one radio frequency, wherein said method includes the steps of(a) providing a flexible insulating sheet,(b) forming a laminate by affixing to opposing surfaces of said sheet first and second metal foils configured as predetermined patterns, said opposing patterns and the insulating sheet sandwiched therebetween forming at least one capacitive element, and at least one of said first and second patterns forming at least one multi-turn inductive element which in combination with said capacitive element results in an inductive-capactive circuit resonant at at least one radio frequency, and(c) forming an electrical contact between at least one selected point on the opposing patterns, wherein said forming step comprisesextruding a localized area of said laminate into a die cavity and in so doing, shearing the insulative sheet at the periphery of the die cavity to cause metal to metal contact between the opposing metal foils at said periphery, andforcing the extruded area back into a substantially planar relationship with the remainder of the laminate to cause the extruded area to form a plug therein and a permanent electrical contact between the opposing foils at the periphery.

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