Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1997-12-15
1998-11-10
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340551, 340572, 148108, G08B 1314
Patent
active
058350160
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 flux concentrating 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 flux concentrators have magnetic anisotropies oriented transversely relative to the length of the wires to aid in coupling the wires for simultaneous switching.
REFERENCES:
patent: 4660025 (1987-04-01), Humphrey
patent: 4710754 (1987-12-01), Montean
patent: 4980670 (1990-12-01), Humphrey et al.
patent: 5519379 (1996-05-01), Ho et al.
patent: 5650236 (1997-07-01), Hirano et al.
Ho Wing
Yamasaki Jiro
Hofsass Jeffery A.
La Anh
Sensormatic Electronics Corporation
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