| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an illumination device, illumination fixture and illumination system which achieve a high functionality of a control device, and reduce the consumption power at abnormal times. <P>SOLUTION: A determination circuit 22 determines whether a lamp 3 can be lit corresponding to abnormal-load signals output by an abnormal-load signal output part 15 (the signals are 5 V at the normal lighting time, 3V when the lamp is unloaded, 2 V at the ending time of life of the lamp, and 0 V at the abnormal time of a lighting device). The determination circuit 22 determines the lighting to be a normal one when the abnormal-load signal is≥4 V and the lamp 3 to be abnormal when the abnormal-load signal is >0 V and <4 V, and the lighting device 1 to be faulty when an energizing signal from a power source circuit 21 is input and the abnormal-load signal is 0 V, and the power supply is interrupted from the power source circuit 21 to a control-signal output part 24 by switching off a switch 29 when the lamp is abnormal and the lighting device is faulty. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
