| 摘要 |
PURPOSE:To remarkably improve the safety with a simple structure by checking the detected signals of a current detecting means at every time of pulse generation of a generating means by a high voltage trigger and stopping the pulse generation after discharge lamp is lighted by a computer control means. CONSTITUTION:A computer control means 28 instructs high voltage trigger generating means 26, 27 to generate one high voltage trigger pulse. At every time of pulse generation, a current detection signal corresponding to the lamp current from a current detecting means 29 is checked to determine whether a discharge lamp 25 is lighted or not. In the case the lamp is not lighted, the control means 28 instructs to generate one more pulse and current detection signal is checked and in the case it is determined that lighting is done, pulse generation is immediately stopped. In this way, at every time a pulse is generated, whether lighting is done or not is determined, so that only the necessary minimum quantity of high voltage trigger is generated and safety is thus improved remarkably. |
