发明名称 |
Optical encoder using off-axis imaging through a lens |
摘要 |
A miniaturized optical encoder capable of obtaining a sufficient amount of light in the light receiving element is provided. An optical encoder 1 includes a scale 2 having a scale track 2' and a readhead 3 having a light source 31 that emits light to the scale track 2', a scale-side lens 32 that transmits the light emitted from the light source 31 to the scale track 2', and a light receiving element 33 that receives the light reflected by the scale track 2' through the scale-side lens 32. The light source 31 is arranged between the scale-side lens 32 and the light receiving element 33. An optical axis Lsrc of the light source 31 is matched with an optical axis Ls of the scale-side lens 32 in a reading direction of the scale 2 and is separated from an optical axis Ls of the scale-side lens 32 by a predetermined distance D in a direction perpendicular to the reading direction of the scale 2. |
申请公布号 |
US8637805(B2) |
申请公布日期 |
2014.01.28 |
申请号 |
US20100956992 |
申请日期 |
2010.11.30 |
申请人 |
ALTENDORF ERIC HERBERT;NAGAHAMA TATSUYA;MIZUTANI MIYAKO;YAKU TORU;MITUTOYO CORPORATION |
发明人 |
ALTENDORF ERIC HERBERT;NAGAHAMA TATSUYA;MIZUTANI MIYAKO;YAKU TORU |
分类号 |
G01D5/34 |
主分类号 |
G01D5/34 |
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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