| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a controller for LED lighting fixture which can move mixed-color light over a wide color temperature range near a black body radiation track and can be manufactured inexpensively. <P>SOLUTION: The controller for LED lighting fixture includes three kinds of light sources 3, 4 and 5 having a LED chip 2l, a LED chip 2w and a LED chip 2y, respectively, as light emission sources and emitting light source lights L, W and Y which are different in color temperature mutually. The controller controls driving currents of the LED chips 2l, 2w and 2y, respectively, simultaneously, continuously and linearly, by varying resistance values of double variable resistors 11, so that the mixed-color light LWY of light source light L, W and Y emitted from the three kinds of the light sources 3, 4 and 5 moves on a track close to the black body radiation track on the trichromatic coordinates. <P>COPYRIGHT: (C)2009,JPO&INPIT |
