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. 28, 2025
Filed:
Oct. 31, 2022
Nichia Corporation, Anan, JP;
NICHIA CORPORATION, Anan, JP;
Abstract
A light-emitting device includes a substrate, a wiring, a light-emitting element configured to emit light having a main wavelength in a range from 500 nm to 560 nm, and a diffusion member. When chromaticity x and chromaticity y of an emission color of the light-emitting device are measured in each of first and second measurement planes in a range in which an angle at the center of the outer shape is in a range from ±60° with reference to a perpendicular line passing through the center of the diffusion member, an average value α of a difference between a maximum value and a minimum value of a chromaticity difference Δx of the chromaticity x measured in the first measurement plane and a difference between a maximum value and a minimum value of a chromaticity difference Δx of the chromaticity x measured in the second measurement plane is less than 0.0024.