| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an illuminating device by which there is no rapid change in luminance of a light-emitting diode at the transition of an illumination scene in a transition time period that is set for each illumination scene. <P>SOLUTION: An illuminating device 1 has: a plurality of grouped illuminating fixtures 2 in each of which light-emitting diodes 7 are arranged and provided; a main control device 3 outputting a control signal 11 corresponding to an illumination scene; and a dimmer 4 having a controller 12 receiving the control signal 11 from the main control device 3, and a driving circuit 13 supplying a current corresponding to a degree of dimming of the light-emitting diodes 7 depending on a PWM signal outputted from the controller 12. The controller 12 calculates a transition rate per unit time of the degree of dimming for each illuminating fixture 2 of a group. When the transition rate is more than a reference transition rate, the control is performed so that the degree of dimming of the light-emitting diodes 7 makes a transition gradually in the transition time period by which a transition rate equal to or less than the reference transition rate can be obtained based on the difference. <P>COPYRIGHT: (C)2013,JPO&INPIT |
