发明授权
- 专利标题: Position detecting apparatus using a magnetic sensor and a closed magnetic circuit with non-uniform magnetic flux distribution
- 专利标题(中): 位置检测装置使用磁传感器和具有不均匀磁通分布的封闭磁路
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申请号: US906027申请日: 1986-09-11
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公开(公告)号: US4810965A公开(公告)日: 1989-03-07
- 发明人: Yoshiro Fujiwara , Michiko Endo , Yuji Kojima , Noboru Wakatsuki , Akira Hirano , Kazunari Komenou
- 申请人: Yoshiro Fujiwara , Michiko Endo , Yuji Kojima , Noboru Wakatsuki , Akira Hirano , Kazunari Komenou
- 申请人地址: JPX Kawasaki
- 专利权人: Fujitsu Limited
- 当前专利权人: Fujitsu Limited
- 当前专利权人地址: JPX Kawasaki
- 优先权: JPX60-202832 19850913; JPX61-009566 19860120; JPX61-009569 19860120; JPX61-009570 19860120; JPX61-036351 19860220; JPX61-050541 19860310; JPX61-073223 19860331
- 主分类号: G01D5/20
- IPC分类号: G01D5/20 ; G01B7/14 ; G01R33/04 ; H01L43/08
摘要:
A position detector having a magnetic sensor for measuring linear or angular displacement, or detecting a position of a body without contact thereto. The detector has a closed circuit including magnets and yokes. The magnetic leakage flux which emanates from the inside surfaces of the yokes is utilized to detect the position of the body. The magnetic sensor is transferred along the inside surfaces of the yokes by a transferring circuit, which senses the magnetic field intensity of the leakage flux distributed thereon. This enables the detector to have a longer measuring range than that of a prior art detectors. An output signal is stable due to the shielding effect of the yokes. The magnetic closed circuit has many magnetic and mechanical configurations. For example, for the magnet, a permanent magnet and an electromagnet can be used. Further, improvements are proposed for enhancing the linearity of the output signal voltage with respect to the transferring distance of the sensing element and for compensating the offset drift of an amplifier or changing the coercive force of permanent magnets.
公开/授权文献
- US6045925A Encapsulated nanometer magnetic particles 公开/授权日:2000-04-04