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:
Mar. 31, 2015
Filed:
Oct. 31, 2011
Koji Miyasaka, Fukushima, JP;
Takuji Nomura, Fukushima, JP;
Koji Miyasaka, Fukushima, JP;
Takuji Nomura, Fukushima, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
A diffractive optical element includes: a first diffractive element in which a plurality of basic units are two-dimensionally arranged; and a second diffractive element in which a plurality of basic units are two-dimensionally arranged, wherein when a direction in which the basic units are arranged in the first diffractive element is a first direction, a direction in which the basic units are arranged in the second diffractive element is a second direction, an angle φ between the first direction and the second direction is such that −|φ|<φ<|φ|, and φ≠0, sin φ=−α/Δx where a closest distance of zero-order light generated when the diffracted light generated by the first diffractive element is further incident on the second diffractive element is Δx and a closest distance of the diffracted light and stray light generated by the second diffractive element is α.