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Security tag for compact disc storage container

  • US 5,081,446 A
  • Filed: 09/24/1990
  • Issued: 01/14/1992
  • Est. Priority Date: 09/24/1990
  • Status: Expired due to Term
First Claim
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1. A security tag for a compact disc container holding a compact disc, the security tag for use with an electronic security system for a surveilled area, including transmitter means for transmitting into the surveilled area electromagnetic energy within a predetermined detection frequency range and receiver means for detecting within the surveilled area the presence of a security tag resonating at a frequency within the detection frequency range in response to the electromagnetic energy, the security tag comprising:

  • a generally flat, planar substrate positioned within the compact disc storage container such that a first portion of the substrate extends beyond the periphery of the compact disc and a second portion of the substrate overlaps at least part of the compact disc, the first and second substrate portions lying in a common plane; and

    circuitry means on the substrate for establishing a resonant circuit, at least part of the circuitry means being located on each of the first and second portions of the substrate, whereby the resonant frequency of the resonant circuit is established at least in part by interaction between the circuitry means and the compact disc.

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