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:
May. 11, 2021
Filed:
Apr. 24, 2018
Nichia Corporation, Anan, JP;
Yukitoshi Marutani, Anan, JP;
NICHIA CORPORATION, Anan, JP;
Abstract
A transmission grating includes: first light-transmissive regions having a refractive index of n; and second light-transmissive regions having a refractive index of nthat is smaller than n. Light-reflecting interfaces on which light transmitted through the first light-transmissive regions is incident are in parallel with one another and are inclined such that a line normal to each of light-reflecting interfaces is at an inclination angle θ with respect to the flat light-incident surface and to the flat light-emitting surface, wherein 0°<θ<90°. When a thickness of the first light-transmissive regions in a direction perpendicular to the light-reflecting surfaces is tand a thickness of the second light-transmissive regions in a direction perpendicular to the light-reflecting surfaces is t, the thickness t, in μm, is in a range of 0.1/π(n−n)to t.