发明名称 |
Permanent magnet assembly with MR element for detection/authentication of magnetic documents |
摘要 |
A magnetic assembly for detection and authentication of magnetic documents. The magnetic assembly includes a permanent magnet (PM), first and second magnetically soft high permeability pole pieces shaped to form a tapered, variable gap size magnetic circuit with the permanent magnet. The PM is located at a first gap between the first and second pole pieces. A magnetoresistive (MR) sensing element is located at or near the center of a second gap between said first and second pole pieces. The second gap and MR sensing element are proximate a magnetic document to be sensed.
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申请公布号 |
US5552589(A) |
申请公布日期 |
1996.09.03 |
申请号 |
US19940330887 |
申请日期 |
1994.10.28 |
申请人 |
EASTMAN KODAK COMPANY |
发明人 |
SMITH, NEIL;JEFFERS, FREDERICK J.;GANDOLA, KENT R.;KOEPPE, PETER V. |
分类号 |
G01R33/09;G01R33/12;G01V3/08;G06K7/01;G06K7/08;G07D7/00;G07D7/04;G07D7/20;G07F7/08;G11B5/02;G11B5/39;H01L43/08;(IPC1-7):G06K7/08 |
主分类号 |
G01R33/09 |
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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