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:
Nov. 02, 2010
Filed:
Feb. 28, 2007
Suguru Takashima, Anan, JP;
Masato Aihara, Komatsushima, JP;
Tomohisa Kishimoto, Anan, JP;
Hitomi Miki, Tokushima, JP;
Kenichi Aoyagi, Anan, JP;
Takeshi Kihara, Tokushima, JP;
Suguru Takashima, Anan, JP;
Masato Aihara, Komatsushima, JP;
Tomohisa Kishimoto, Anan, JP;
Hitomi Miki, Tokushima, JP;
Kenichi Aoyagi, Anan, JP;
Takeshi Kihara, Tokushima, JP;
Nichia Corporation, Anan-shi, JP;
Abstract
An object of the present invention is to provide a light emitting device which emits light of deep yellowish color with high luminance. The light emitting device of the present invention comprises a light emitting element having a peak emission wavelength shorter than 490 nm, a fluorescent material for wavelength conversion which absorbs light from the light emitting element and emits light of a wavelength longer than that of the light from the light emitting element, and a filter which cuts off a part of a mixed light produced by mixing the light of the light emitting element and the light of the fluorescent material, wherein the light transmitted through the filter has a chromaticity coordinate on the chromaticity diagram according to CIE 1931 plotted in a region defined by a first point (x=0.450, y=0.450), a second point (x=0.250, y=0.650), a third point (x=0.350, y=0.750) and a fourth point (x=0.250, y=0.750) and in the region defined by a closed curve consisting of the monochromatic locus and the purple boundary.