| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a LED lighting device having a simple configuration in which color change is prevented during life in light consisting of lights with different wavelengths outputted from plural LEDs. <P>SOLUTION: Drivers 2r, 2g and 2b which are supplied with electric power from a DC power source 1 supply driving currents Ir, Ig and Ib by which life time is equal in all of a red LED 3r, a green LED 3g, and a blue LED 3b. Consequently, ratio among light quantity of the red LED 3r, light quantity of the green LED 3g, and light quantity of the blue LED 3b becomes constant without being affected by changes of outputs of the respective LEDs during the life, color mixing ratio among red, green and blue does not change during the life, and generated white light does not change, either. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
