Invention Grant
- Patent Title: Light emitting device and LED light bulb
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Application No.: US15791932Application Date: 2017-10-24
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Publication No.: US10368409B2Publication Date: 2019-07-30
- Inventor: Hiroyasu Kondo , Masahiko Yamakawa , Yasuhiro Shirakawa , Ryoji Tsuda , Atsuji Nakagawa , Toshitaka Fujii , Tomohiko Inoue
- Applicant: Toshiba Materials Co., Ltd. , Phoenix Electric Co., Ltd.
- Applicant Address: JP Yokohama-Shi
- Assignee: Toshiba Materials Co., Ltd.
- Current Assignee: Toshiba Materials Co., Ltd.
- Current Assignee Address: JP Yokohama-Shi
- Priority: JP2014-057335 20140320
- Main IPC: H05B33/08
- IPC: H05B33/08 ; F21K9/232 ; F21K9/238 ; F21K9/235 ; C09K11/08 ; C09K11/66 ; C09K11/77 ; F21V3/02 ; F21V23/00 ; H01L33/50 ; H01L25/075 ; H01L25/16 ; F21Y103/10 ; F21Y115/10

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.
Public/Granted literature
- US20180049285A1 LIGHT EMITTING DEVICE AND LED LIGHT BULB Public/Granted day:2018-02-15
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