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Tamper detection sensor

  • US 5,541,578 A
  • Filed: 06/05/1995
  • Issued: 07/30/1996
  • Est. Priority Date: 12/08/1992
  • Status: Expired due to Fees
First Claim
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1. A tamper detection sensor comprising a substrate of an electrically insulating material to one side of which is applied an electrically conductive material, said electrically conductive material including elements electrically isolated from one another, an electrically conductive bridge member interconnecting said elements and being secured to said elements by an electrically conductive adhesive, and a layer of electrically non-conductive adhesive applied to said one side of the substrate to encase said elements and bridge member and by which the sensor can be secured to an item to be protected, the arrangement being such that, on relative movement between the substrate and the layer of non-conductive adhesive, the conductive adhesive is deformed whereby the electrical resistance thereof is altered, said alteration in resistance being utilized to provide an indication of said relative movement.

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