| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress occurrence of flicker of a light source just after instantaneous power failure.SOLUTION: A controller 22 does not output trigger signals (TG3 and TG4 in Figure 1) immediately after a synchronization interval is determined to be converged within a reference range, but outputs trigger signals (TG5 and TG6 in Figure 1) corresponding to a next synchronization signal. When a trigger signal is output just after the synchronization interval is determined to be converted within the reference range, there is a probability that the synchronization signal is deviated depending on occurrence timing of the instantaneous power failure and thus flicker occurs in the light source. On the other hand, the controller 22 according to this embodiment does not output trigger signals TG3, TG4 immediately after the synchronization interval is determined to be converged within the reference range, but outputs the trigger signals TG5, TG6 corresponding to the next synchronization signal. As a result, this embodiment can suppress occurrence of flicker of a light source 10 immediately after instantaneous power failure as compared with a prior art described in Patent Document 1.</p> |
