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    • 9. 发明专利
    • Led lighting equipment
    • JP5452877B2
    • 2014-03-26
    • JP2008064878
    • 2008-03-13
    • パナソニック株式会社
    • 健一郎 田中
    • H01L33/50F21S2/00F21S8/04F21V23/00F21Y101/02H01L33/48
    • PROBLEM TO BE SOLVED: To provide an LED lighting device capable of achieving improvement in accuracy of color temperature control. SOLUTION: In the LED lighting device, chromaticity points Wa, Wb, Wc of each light-emitting device 1a, 1b, 1c are so set to satisfy a relation that: a straight line connecting a chromaticity point Wc of a blue-color system light-emitting device 1c and a chromaticity point Wb of a green-color light-emitting device 1b in an xy chromaticity diagram of an XYZ color system passes a chromaticity point W 1 of a high-temperature end (7,000 K in an illustrated example) of a desired color temperature adjustment range regulated on a blackbody locus BL; a straight line connecting a chromaticity point Wa of a red-color system light-emitting device 1a and a chromaticity point Wb of the green-color system light-emitting device 1b passes a chromaticity point W 2 of a low-temperature end (2,500 K in an illustrated example) of the color temperature adjustment range; and a straight line connecting the chromaticity point Wc of the blue-color system light-emitting device 1c and the chromaticity point Wa of the red-color system light-emitting device 1a is at a side with a value of y smaller than a line connecting the chromaticity points W 1 , W 2 at either end of the color temperature adjustment range in a direction along a y-axis of the chromaticity coordinate. COPYRIGHT: (C)2010,JPO&INPIT