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:
Aug. 04, 2015
Filed:
Mar. 21, 2014
Stanley Electric Co., Ltd., Meguro-ku, Tokyo, JP;
Shogo Kirai, Kanagawa, JP;
Hironobu Sakamoto, Tokyo, JP;
STANLEY ELECTRIC CO., LTD., Tokyo, JP;
Abstract
The present invention is directed to reduction of angle dependence of chromaticity in a phosphor layer, without using a light scattering agent, the phosphor layer being made up of phosphor particles adhered tightly to one another via a binder according to the spray coating method. The phosphor layer contains phosphor particles laid along the top surface of the light emitting element and the binder embedded into a gap between the phosphor particles, and the phosphor layer does not contain the light scattering agent. The area of a region on the upper surface of the phosphor layer is between or equal to 3% and 10% with respect to the area of the top surface of the light emitting element, the region being positioned at the gap between the phosphor particles and allowing the light being outputted to pass through the binder and directly reach the upper surface of the phosphor layer. This configuration makes the asperities smaller on the surface of the phosphor layer and reduces the angular dependence of chromaticity.