| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve safety by avoiding an overload state. <P>SOLUTION: A detection part 5 detects an overload state of a power supply circuit part 3 based on an output voltage VDC. If the overload state is detected, a control part 6 controls the power supply circuit part 3 so that the output voltage VDC becomes less than drive voltages of light source parts 1A, 1B. Thus, both of the light source parts 1A, 1B are turned off because a lighting state cannot be maintained, thereby capable of improving safety by avoiding an overload state. <P>COPYRIGHT: (C)2013,JPO&INPIT |
