Collector type article surveillance marker with continuous keeper
First Claim
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1. A marker for use in an electronic article surveillance system, comprising:
- a responder sheet of high permeability, low coercive force ferromagnetic responder material having a predetermined width and length, and having opposing portions along each lengthwise edge from which the responder material is removed, the responder material between the opposing portions forming a switching section, and the responder material extending away from the opposing portions toward each widthwise edge forming flux collecting sections, wherein the switching section produces alternate switching pulses when the magnetic state therein is reversed by an applied alternating magnetic field, and wherein the flux collecting sections collect and channel magnetic flux into the switching section, anda magnetizable sheet of remanently magnetizable material coextensive with the sheet of responder material, overlying and magnetically coupled to the sheet of responder material, which magnetizable sheet, when magnetized causes a shift in the alternate switching pulses from when the magnetizable sheet is not magnetized.
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Abstract
A dual-status marker for use in electronic article surveillance systems having an alternating magnetic field within an interrogation zone. The marker comprises a piece of a high permeability, low coercive force magnetic material substantially coextensive with a piece of remanently magnetizable material. The first piece is rectangular and exhibits lengthwise sections at which the material is removed, thus leaving narrow width regions forming switching sections, portions adjacent each end forming flux collectors. The marker is desensitized by uniformly magnetizing the piece of remanently magnetizable material.
24 Citations
10 Claims
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1. A marker for use in an electronic article surveillance system, comprising:
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a responder sheet of high permeability, low coercive force ferromagnetic responder material having a predetermined width and length, and having opposing portions along each lengthwise edge from which the responder material is removed, the responder material between the opposing portions forming a switching section, and the responder material extending away from the opposing portions toward each widthwise edge forming flux collecting sections, wherein the switching section produces alternate switching pulses when the magnetic state therein is reversed by an applied alternating magnetic field, and wherein the flux collecting sections collect and channel magnetic flux into the switching section, and a magnetizable sheet of remanently magnetizable material coextensive with the sheet of responder material, overlying and magnetically coupled to the sheet of responder material, which magnetizable sheet, when magnetized causes a shift in the alternate switching pulses from when the magnetizable sheet is not magnetized. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification