发明授权
- 专利标题： Rotation detector having a plurality of magnetism detection elements, a plurality of magnetic resistors which are able to switch the resistance from great to small and vice-versa
- 专利标题（中）： 具有多个磁检测元件的旋转检测器，能够将电阻从大到小切换的多个磁性电阻器，反之亦然
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申请号： US09522243申请日： 2000-03-09
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公开(公告)号： US06496002B1公开(公告)日： 2002-12-17
- 发明人: Katsuya Kogiso , Yasushi Nishibe , Masahiro Taniguchi , Shinji Usui
- 申请人： Katsuya Kogiso , Yasushi Nishibe , Masahiro Taniguchi , Shinji Usui
- 优先权： JP11-065166 19990311; JP11-135838 19990517
- 主分类号： G01B714
- IPC分类号： G01B714
摘要：
A rotation detector includes a rotor having a shaft. Projections are located at predetermined intervals on the periphery of the rotor and extend in an axial direction. Magnets are located between the projections and the shaft. The flux of each magnet is detected by a corresponding magnetism detection element. Each magnetism detection element has magnetic resistors. Movement of the projections changes the direction of flux of the magnets. Each resistor is switched between a first state, in which its magnetic resistance is great, and a second state, in which its magnetic resistance is small, in accordance with the change of the flux direction. The resistors are divided into two groups. The groups are substantially symmetrical relative to a centerline of the groups such that, when the direction of the flux changes, the resistors in one group are in the opposite state from the resistors in the other group. The centerline of changes in the direction of the flux matches the centerline of the resistor groups.
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