| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of stably reproducing an output ratio among light sources even in a transient period during which the output is changed. <P>SOLUTION: A lighting device outputs mixed color light at a desired color temperature by individually controlling light outputs from a plurality of kinds of LEDs 7A to 7C which emit light having different wavelengths. The lighting device comprises: a dimmer 1 which outputs a setting signal for adjusting the output of the mixed color light; a first filter 3 which smooths the setting signal from the dimmer 1; light output adjustment means which adjusts, based on the setting signal thus smoothed by the first filter 3, the light outputs from the LEDs 7A to 7C; and a plurality of second filters 6A to 6C which respectively smooth signals outputted from the light output adjustment means to the LEDs 7A to 7C. In the lighting device, a time constant of each of the second filters 6A to 6C is set to a value lower than a time constant of the first filter 3. As a result, an output ratio among the LEDs 7A to 7C can be stably reproduced even in a transient period during which the output is changed. <P>COPYRIGHT: (C)2013,JPO&INPIT |
