发明名称 |
OPTICAL UNIT AND DISPLACEMENT MEASURING DEVICE |
摘要 |
An optical unit includes: a first diffraction grating where light from a light source enters; a second diffraction grating that generates interference light as a result of diffracted light rays emitted from the first diffraction grating entering the second diffraction grating; and an optical member including a pair of reflective surfaces that are parallel and opposite to each other, the optical member being configured such that the pair of reflective surfaces respectively reflect ±mth-order diffracted light rays that are diffracted light rays of a specific order among a plurality of orders of the diffracted light rays emitted from the first diffraction grating so as to guide the ±mth-order diffracted light rays to the second diffraction grating, where m is a natural number. |
申请公布号 |
US2016216101(A1) |
申请公布日期 |
2016.07.28 |
申请号 |
US201615003548 |
申请日期 |
2016.01.21 |
申请人 |
TAIYO YUDEN CO., LTD. |
发明人 |
OYAMA Katsuhiro;MIYAZAWA Fuyuki;HAGIWARA Yasuhito;HAMAMOTO Takaki;MATSUDA Isao |
分类号 |
G01B9/02;G01D5/26;G02B27/42 |
主分类号 |
G01B9/02 |
代理机构 |
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代理人 |
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主权项 |
1. An optical unit, comprising:
a first diffraction grating where light from a light source enters; a second diffraction grating that generates interference light as a result of diffracted light rays emitted from said first diffraction grating entering said second diffraction grating; and an optical member including a pair of reflective surfaces that are parallel and opposite to each other, said optical member being configured such that said pair of reflective surfaces respectively reflect ±mth-order diffracted light rays that are diffracted light rays of a specific order among a plurality of orders of the diffracted light rays emitted from said first diffraction grating so as to guide the ±mth-order diffracted light rays to said second diffraction grating, where m is a natural number. |
地址 |
Tokyo JP |