发明公开
- 专利标题： Thermomagnetically-patterned magnets and method of making same
- 专利标题（中）： 热电偶磁铁及其制造方法
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申请号： EP91202270.4申请日： 1991-09-05
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公开(公告)号： EP0480489A3公开(公告)日： 1992-10-07
- 发明人: Bradley, John Robert , Schroeder, Thaddeus , Perry, Thomas Arthur
- 申请人： GENERAL MOTORS CORPORATION
- 申请人地址： General Motors Building 3044 West Grand Boulevard Detroit Michigan 48202 US
- 专利权人： GENERAL MOTORS CORPORATION
- 当前专利权人： GENERAL MOTORS CORPORATION
- 当前专利权人地址： General Motors Building 3044 West Grand Boulevard Detroit Michigan 48202 US
- 代理机构： Denton, Michael John
- 优先权： US589352 19900928
- 主分类号： G06K1/12
- IPC分类号： G06K1/12 ; H01F41/02 ; H01F7/02
摘要：
A permanent magnet (10) is heated in a pattern by a laser beam (18) to a localized temperature above the Curie point therof or a temperature sufficient to reduce the magnet coercivity thereof sufficiently for the field of the magnet (16') or an external field to re-magnetize the pattern in the reverse direction. Magnets so produced can have very high pole densities, digital encoding and analog patterns having gradually varying local magnetic field strengths.
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