Title:
LIGHTING DEVICE
Document Type and Number:
Japanese Patent JP2017174696
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a technique capable of suppressing variation in the color temperature of irradiation light for the current value in each circuit, even if the forward voltage drop of a light-emitting diode fluctuates.SOLUTION: A light control color matching circuit 14 has first light source arrays 41, 42 where multiple first LED light sources 31 are interconnected in series, second light source arrays 51, 52 where a constant current element 36 and multiple second LED light sources 32 are connected in series, and an input section 33. The input section 33 connects the first light source arrays 41, 42 and the second light source arrays 51, 52 in parallel, and feeds a supplied current to the first light source arrays 41, 42 and the second light source arrays 51, 52. The first LED light sources 31 are light sources of first color temperature. The second LED light sources 32 are white light sources of second color temperature different from the first color temperature.SELECTED DRAWING: Figure 3
Inventors:
NAKATO MINORU
Application Number:
JP2016061009A
Publication Date:
September 28, 2017
Filing Date:
March 25, 2016
Export Citation:
Assignee:
ENDO LIGHTING CORP
International Classes:
H05B37/02
Domestic Patent References:
| JPS51136079U | 1976-11-02 | |||
| JP2014063672A | 2014-04-10 | |||
| JP2015060684A | 2015-03-30 | |||
| JP2009135226A | 2009-06-18 | |||
| JP2011159495A | 2011-08-18 | |||
| JP2010272840A | 2010-12-02 |
Foreign References:
| WO2015141222A1 | 2015-09-24 |
Attorney, Agent or Firm:
Takami Nishida