发明名称 |
Rod axial position detector including plural scales wherein nonmagnetized portions have differing spacing and differing depths and means for calculating the absolute position are provided |
摘要 |
A magnetic scale is formed by a plurality of non-magnetic parts arranged at equidistant intervals in all axial direction on a magnetic rod which displaces in the axial direction. The non-magnetic parts consist of first non-magnetic parts having a constant depth, and second non-magnetic parts having a different depth. A magnetic sensor which outputs a signal according to the depth and positional change of the non-magnetic parts is installed at a fixed position opposite the magnetic scale. Further provided are a mechanism for identifying a second non-magnetic part which has passed the magnetic sensor based on the output of the sensor, a memory for individually storing the absolute positions of the second non-magnetic parts, and a mechanism for calculating the displacement of the rod from the identified second non-magnetic part to its current position based oil the sensor output. The absolute position of the rod is detected, in terms of a small displacement from its stationary position, by computing it from the absolute position of the identified second non-magnetic part stored in the memory and the displacement of the rod from this second non-magnetic part. This assembly comprises only a single magnetic scale having several types of non-magnetic parts, and is therefore more economical to manufacture than the conventional assembly having a plurality of magnetic scales.
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申请公布号 |
US5461311(A) |
申请公布日期 |
1995.10.24 |
申请号 |
US19930168728 |
申请日期 |
1993.12.16 |
申请人 |
KAYABA KOGYO KABUSHIKI KAISHA |
发明人 |
NAKAZATO, MASAKAZU;SHIMOURA, YOUICHI;SUGIHARA, MASAMICHI |
分类号 |
G01B7/00;G01D5/14;G01D5/16;G01D5/245;(IPC1-7):G01P3/52 |
主分类号 |
G01B7/00 |
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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