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:
Jul. 15, 2014
Filed:
May. 23, 2012
Yuuya Yamamoto, Osaka, JP;
Yuuya Yamamoto, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A variable color light emitting device includes first, second and third light sources differing in chromaticity of emission light; and a driver for changing light outputs. The chromaticities of the second and third light sources are selected such that, on straight lines passing through reference chromaticities of the second and third light sources and a chromaticity of an arbitrary color temperature on the blackbody locus, a ratio of a distance between the chromaticity of the second light source and the chromaticity on the blackbody locus to a distance between the chromaticity of the third light source and the chromaticity on the blackbody locus becomes equal to a ratio of a distance between the reference chromaticity of the second light source and the chromaticity on the blackbody locus to a distance between the reference chromaticity of third light source and the chromaticity on the blackbody locus.