发明名称 |
Dual status thin-film EAS marker. |
摘要 |
<p>A dual status marker for use with a magnetic-type EAS system has a signal-producing layer including at least one magnetic thin-film of high permeability and low coercive force such as permalloy, and a signal-blocking layer including at least one remanently magnetizable thin-film such as an Fe-Cr alloy. The remanently magnetizable thin-film or thin-films should have a total thickness at least equal to, and preferably at least twice, the total thickness of the magnetic thin-film or thin-films of high permeability. By doing so, the marker is more reliably deactivated when the signal-blocking layer is magnetized. For even greater assurance of deactivation, the signal-blocking layer should include more than one remanently magnetizable thin-film, thus giving it a squarer B-H loop and greater assurance against false alarms. <IMAGE></p> |
申请公布号 |
EP0604293(A1) |
申请公布日期 |
1994.06.29 |
申请号 |
EP19930403099 |
申请日期 |
1993.12.20 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
TSAI, CHING-LONG, C/O MINNESOTA MINING AND |
分类号 |
G08B13/24;H01F10/00;H01F10/12;H01F10/13;(IPC1-7):G08B13/24 |
主分类号 |
G08B13/24 |
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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