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:
Apr. 26, 2016
Filed:
Apr. 02, 2012
Kenichi Yoshimura, Osaka, JP;
Kohsei Takahashi, Osaka, JP;
Hiroshi Fukunaga, Osaka, JP;
Masatsugu Masuda, Osaka, JP;
Kenichi Yoshimura, Osaka, JP;
Kohsei Takahashi, Osaka, JP;
Hiroshi Fukunaga, Osaka, JP;
Masatsugu Masuda, Osaka, JP;
SHARP KABUSHIKI KAISHA, Osaka-shi, Osaka, JP;
Abstract
Provided is a light emitting device with effectively improved color rendering properties. A light emitting deviceincludes: a light sourcethat emits light having the maximum intensity at a predetermined wavelength; a first phosphor (yellow phosphor)that absorbs the light emitted by the light sourceand outputs fluorescent light having the maximum intensity at a first wavelength which is longer than the predetermined wavelength; and a second phosphor (red phosphor)that absorbs the light emitted by the light sourceand outputs fluorescent light having the maximum intensity at a second wavelength which is longer than the first wavelength. An absolute value of wavelength dependency of an optical absorption rate of the second phosphorat the first wavelength is set to not more than 0.6%/nm. Accordingly, the color rendering properties of the light emitted by the light emitting devicecan be effectively improved.