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:
Feb. 13, 2018
Filed:
Jul. 20, 2016
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Akira Hashiya, Osaka, JP;
Taku Hirasawa, Kyoto, JP;
Yasuhisa Inada, Osaka, JP;
Yoshitaka Nakamura, Osaka, JP;
Mitsuru Nitta, Kyoto, JP;
Takeyuki Yamaki, Nara, JP;
Abstract
A light-emitting apparatus includes a light-emitting device and an excitation light source. The light-emitting device includes a photoluminescent layer, a light-transmissive layer. At least one of the photoluminescent layer and the light-transmissive layer has a submicron structure having at least projections or recesses. Light emitted from the photoluminescent layer includes first light having a wavelength λin air. The distance Dbetween adjacent projections or recesses and the refractive index nof the photoluminescent layer for the first light satisfy λ/n<D<λ. A thickness of the photoluminescent layer, the refractive index n, and the distance Dare set to limit a directional angle of the first light emitted from the light emitting surface. The excitation light source emits excitation light. The light-emitting device is integrally provided with the excitation light source.