| 发明名称 |
APPARATUS FOR THE RELATIVE POSITIONING OF TWO OBJECTS BY MEANS OF A BEAM OF RADIATION |
| 摘要 |
A displacement sensing device using superimposed dissimilar circular moire patterns. Groups of circles in one of the patterns alternately have a greater and a smaller pitch than those of the other pattern.
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| 申请公布号 |
US3689162(A) |
申请公布日期 |
1972.09.05 |
| 申请号 |
USD3689162 |
申请日期 |
1971.01.25 |
| 申请人 |
ERIC TAPLEY FERGUSON |
发明人 |
ERIC TAPLEY FERGUSON |
| 分类号 |
B63H25/46;G01D5/38;H01J29/81;(IPC1-7):G01G11/04 |
主分类号 |
B63H25/46 |
| 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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