发明名称 |
DIFFRACTIVE OPTICAL ELEMENT AND MEASUREMENT DEVICE |
摘要 |
Disclosed are a diffractive optical element and a measurement device that are capable of reliably suppressing occurrence of a zero-order diffracted light beam and generating light spots in a wide range. The diffractive optical element has concave and convex portions and diffracts incident light in two dimensions to generate diffracted light. When a maximum diffraction angle with reference to an optical axis of the incident light is an angle range theta, the angle range theta is 7.5° or greater, and diffraction efficiency in a zero-order diffracted light beam is 5% or less. |
申请公布号 |
US2013182327(A1) |
申请公布日期 |
2013.07.18 |
申请号 |
US201313760831 |
申请日期 |
2013.02.06 |
申请人 |
ASAHI GLASS COMPANY, LIMITED;ASAHI GLASS COMPANY, LIMITED |
发明人 |
MIYASAKA KOJI;NOMURA TAKUJI |
分类号 |
G02B5/18 |
主分类号 |
G02B5/18 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|