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MULTI-THREAD RE-ENTRANT MARKER WITH SIMULTANEOUS SMULTI-THREAD RE-ENTRANT MARKER WITH SIMULTANEOUS SWITCHING WITCHING
MULTI-THREAD RE-ENTRANT MARKER WITH SIMULTANEOUS SMULTI-THREAD RE-ENTRANT MARKER WITH SIMULTANEOUS SWITCHING WITCHING
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机译:同时切换的多线程重新进入标记器同时切换的多线程重新进入标记器
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摘要
A marker for a harmonic electronic article surveillance system includes three wires of magnetic material arranged in parallel. The material has a magnetic hysteresis loop with a large Barkhausen discontinuity such that, upon exposure of the marker to an external magnetic field whose field strength in the direction opposing the instantaneous magnetic polarization of the marker exceeds a predetermined threshold value, there results a regenerative reversal of the magnetic polarization in the material. The three wires are coupled at opposite ends thereof by magnetic charge spreading elements formed of a highly permeable material so that all three wires exhibit the regenerative reversal simultaneously on exposure to the abovedescribed magnetic field. The resulting harmonic marker can be formed with a substantially shorter over-all length than previously practical markers of the harmonic type while providing a signal of comparable amplitude.
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