发明授权
US5371633A Mechanism for detecting a rotation amount of a diaphragm for use in
optical systems
失效
用于检测在光学系统中使用的光圈的旋转量的机构
- 专利标题： Mechanism for detecting a rotation amount of a diaphragm for use in optical systems
- 专利标题（中）： 用于检测在光学系统中使用的光圈的旋转量的机构
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申请号： US770878申请日： 1991-10-04
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公开(公告)号： US5371633A公开(公告)日： 1994-12-06
- 发明人: Hiroshi Kawamura , Masato Tsujinaka
- 申请人： Hiroshi Kawamura , Masato Tsujinaka
- 申请人地址： JPX
- 专利权人： Sony Corporation
- 当前专利权人： Sony Corporation
- 当前专利权人地址： JPX
- 优先权： JPX2-276849 19901016
- 主分类号： G01B7/30
- IPC分类号： G01B7/30 ; G01B7/00 ; G01D5/18 ; G03B9/02 ; G03B9/06 ; G02B9/08 ; G02B9/02 ; G02B15/14
摘要：
A magnetic element is provided on the outer periphery of a ring member which is operatively connected with diaphragm blades. This magnetic element is either shaped or constructed so that it exhibits a magnetic gradient (viz., produces non-uniform magnetic leakage flux properties). A Hall sensor is mounted stationarily with respect to the ring member so as to respond to the change in magnetic leakage flux and indicate the amount of rotation of the ring.
公开/授权文献
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