The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 2016
Filed:
Feb. 06, 2013
Applicant:
Asahi Glass Company, Limited, Chiyoda-ku, JP;
Inventors:
Koji Miyasaka, Fukushima, JP;
Takuji Nomura, Fukushima, JP;
Assignee:
ASAHI GLASS COMPANY, LIMITED, Chiyoda-ku, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 5/18 (2006.01); G01B 11/25 (2006.01); G03H 1/02 (2006.01);
U.S. Cl.
CPC ...
G02B 5/1861 (2013.01); G01B 11/25 (2013.01); G02B 5/18 (2013.01); G02B 5/1842 (2013.01); G03H 1/0244 (2013.01);
Abstract
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 θ, the angle range θ is 7.5° or greater, and diffraction efficiency in a zero-order diffracted light beam is 5% or less.