Security tag and manufacturing method
First Claim
1. A security tag for use with an electronic security system having means for detecting the presence of a security tag within a surveilled area utilizing electromagnetic energy at a frequency within a predetermined detection frequency range, the security tag comprising:
- a dielectric substrate having a first principal surface, a second, opposite principal surface, and a peripheral outer edge;
at least one resonant circuit comprising a first conductive pattern disposed on the substrate first surface and a second conductive pattern disposed on the substrate second surface, the resonant circuit capable of resonating at a frequency within the predetermined detection frequency range; and
an electrically discontinuous conductive member extending along at least a portion of the peripheral outer edge of the substrate and surrounding at least a portion of the resonant circuit, the conductive member being effectively electrically.
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Accused Products
Abstract
A security tag used with an electronic article surveillance system for detecting the presence of the tag within a surveilled area utilizing electromagnetic energy at a frequency within a predetermined detection frequency range includes a dielectric substrate having first and second opposing principle surfaces, a peripheral outer edge, and a resonant circuit capable of resonating at a frequency within the predetermined detection frequency range. The security tag also includes a guard member, in one embodiment a discontinuous conductive member, effectively electrically isolated from the resonant circuit, extending along at least a portion of the peripheral outer edge of the substrate for surrounding at least a portion of the resonant circuit. The guard member electrically isolates the resonant circuit to facilitate testing of the resonant circuit during an early stage of the manufacturing process when the resonant circuit is in web form.
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Citations
15 Claims
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1. A security tag for use with an electronic security system having means for detecting the presence of a security tag within a surveilled area utilizing electromagnetic energy at a frequency within a predetermined detection frequency range, the security tag comprising:
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a dielectric substrate having a first principal surface, a second, opposite principal surface, and a peripheral outer edge; at least one resonant circuit comprising a first conductive pattern disposed on the substrate first surface and a second conductive pattern disposed on the substrate second surface, the resonant circuit capable of resonating at a frequency within the predetermined detection frequency range; and an electrically discontinuous conductive member extending along at least a portion of the peripheral outer edge of the substrate and surrounding at least a portion of the resonant circuit, the conductive member being effectively electrically. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A security tag for use with an electronic security system having means for detecting the presence of a security tag within a surveilled area utilizing electromagnetic energy at a frequency within a predetermined detection frequency range, the security tag comprising:
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a dielectric substrate having a first side, a second, opposite side, and a peripheral outer edge; at least one resonant circuit comprising a first conductive pattern disposed on the substrate first side and a second conductive pattern disposed on the substrate second side, the resonant circuit capable of resonating at a frequency within the predetermined detection frequency range; and a guard member disposed along at least a portion of the peripheral edge of the substrate and surrounding at least a portion of the resonant circuit to electrically isolate the resonant circuit, wherein the guard member comprises a conductive material. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification