发明名称 |
Multi-thread re-entrant marker with transverse-anisotropy flux concentrators |
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 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. |
申请公布号 |
AU1386699(A) |
申请公布日期 |
1999.07.05 |
申请号 |
AU19990013866 |
申请日期 |
1998.11.09 |
申请人 |
SENSORMATIC ELECTRONICS CORPORATION |
发明人 |
WING HO;JIRO YAMASAKI |
分类号 |
C21D6/00;C21D1/04;G06K7/08;G08B13/24 |
主分类号 |
C21D6/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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