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. 27, 2018
Filed:
Jul. 17, 2015
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Masaki Inoue, Tokyo, JP;
Seiji Kitamura, Tokyo, JP;
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
The fluorescence light source device of the present invention includes a fluorescence member formed from a phosphor composed of single crystal or polycrystal and excited by excitation light. A periodic structure layer made of a high refractive index material having a refractive index of not less than the refractive index of the fluorescence member is formed on the surface of the fluorescence member. The periodic structure layer has a surface with a periodic structure having a periodic array of conical or truncated projections and formed by an etching process. The aspect ratio which is a ratio of the height of the projections to the pitch in the periodic structure is within a range of 0.5 to 0.9.