Marker for coded electronic article identification system
AssigneeMetglas, Inc.
InventorRyusuke Hasegawa
Life of this patent
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Abstract
A coded marker in a magnetomechanical resonant electronic article identification system, includes a plurality of ductile magnetostrictive elements or strips based on an amorphous magnetic alloy ribbon with improved magnetomechanical resonance performance. The coded marker takes full advantage of the improved magnetomechanical properties, and an electronic article identification system utilizes the coded marker. The improved encodable and decodable marker/identification system is capable of identifying considerably larger number of articles than conventional systems.
Claims17
A coded marker of a magnetomechanical resonant electronic article identification system, adapted to resonate mechanically at preselected frequencies, comprising:
- a plurality of ductile magnetostrictive strips cut to predetermined lengths from amorphous ferromagnetic alloy ribbons that have curvatures along a ribbon length direction and exhibit magnetomechanical resonance under alternating magnetic field excitations with a static bias field, the strips having a magnetic anisotropy direction perpendicular to a ribbon axis, wherein at least two of the strips are adapted to be magnetically biased to resonate at a single, different one of the preselected frequencies.
An electronic article identification system having a capability of decoding coded information of a coded marker, the system comprising one of:
- a pair of coils emitting an AC excitation field with varying frequency aimed at the coded marker to form an interrogation zone;
- a pair of signal detection coils receiving coded information from the coded marker;
- an electronic signal processing device with an electronic computer with a software to decode information coded on the coded marker;
- or
- an electronic device identifying the coded marker,
- wherein the coded marker is adapted to resonate mechanically at preselected frequencies, wherein the coded marker comprises a plurality of ductile magnetostrictive strips cut to predetermined lengths from amorphous ferromagnetic alloy ribbons that have curvatures along a ribbon length direction and exhibit magnetomechanical resonance under alternating magnetic field excitations with a static bias field, the strips having a magnetic anisotropy direction perpendicular to a ribbon axis, and wherein at least two of the strips are adapted to be magnetically biased to resonate at a single, different one of the preselected frequencies.
Dependencies are inferred from the claim text.