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. 30, 2019
Filed:
Oct. 24, 2017
Toshiba Materials Co., Ltd., Yokohama-Shi, JP;
Phoenix Electric Co., Ltd., Himeji-Shi, JP;
Hiroyasu Kondo, Yokohama, JP;
Masahiko Yamakawa, Yokohama, JP;
Yasuhiro Shirakawa, Yokohama, JP;
Ryoji Tsuda, Yokohama, JP;
Atsuji Nakagawa, Himeji, JP;
Toshitaka Fujii, Himeji, JP;
Tomohiko Inoue, Himeji, JP;
Toshiba Materials Co., Ltd., Yokohama-Shi, JP;
Abstract
A light emitting device includes: a first white light source which includes N pieces of first white light emitting diodes and emits a first white light; and a second white light source which includes M pieces of second white light emitting diodes and a first resistance element electrically connected in series to the second white light emitting diodes and having a first resistance value, is electrically connected in parallel to the first white light source, and emits a second white light, the light emitting device emitting a mixed white light of the first white light and the second white light. The drive voltage of the first white light source is higher than a drive voltage of the second white light source, and a color temperature of the mixed white light is higher as a total luminous flux of the mixed white light is higher.