Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-04-19
1996-05-21
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
340572, G08B 1324
Patent
active
055193790
ABSTRACT:
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 above-described 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.
REFERENCES:
patent: 4660025 (1987-04-01), Humphrey
patent: 4710754 (1987-12-01), Montean
patent: 4960651 (1990-10-01), Pettigrew et al.
Ho Wing
Yamasaki Jiro
Sensormatic Electronics Corporation
Swann Glen
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