发明名称 |
MULTI-LAYER THIN-FILM EAS MARKER |
摘要 |
A marker for use in magnetic-type electronic article surveillance systems, comprising a substrate on which are deposited a plurality of high permeability, low coercive force magnetic thin-films, each being separated from an adjacent magnetic thin-film by a non-magnetic thin-film. Each of the magnetic films have substantially the same permeability and coercive force, and the non-magnetic films are of a thickness to allow magnetostatic coupling while inhibiting exchange coupling. Accordingly, all of the magnetic thin-films reverse as a single entity and produce a sharp, readily distinguishable response.
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申请公布号 |
CA2041581(C) |
申请公布日期 |
2000.02.29 |
申请号 |
CA19912041581 |
申请日期 |
1991.05.01 |
申请人 |
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发明人 |
PIOTROWSKI, CHESTER;BRUZZONE, CHARLES LOUIS;TSAI, CHING-LONG;MCALLISTER, JEROME WATT |
分类号 |
G08B13/24;(IPC1-7):G08B13/22 |
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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