| 摘要 |
PURPOSE:To obtain high efficiency and high luminance by applying between a pair of electrodes a pulse voltage which has a period of electricity transmission and a stopping period during one cycle and the electricity transmission period of which is in a specific rate and which is specific during one cycle. CONSTITUTION:A pulse voltage generating source for outputting a pulse voltage which has a period of electricity transmission and a stopping period during one cycle and the electricity transmission time of which is in the rate of 5 to 70% and less than 150musec during one cycle is connected between electrodes 3a, 3b provided at both ends of a fluorescent a lamp 10 having a rare gas sealed therein. Thereby the probability of exciting molecules of the rare gas at an energy level where the resonance ultraviolet rays of the rare gas contributing to light emission are much emitted is increased and also loss of the electrodes is restrained. Also, a control means 15 controls the continuity and discontinuity conditions of a switch means and so a desired pulse voltage is applied via a step-up transformer 12 between the pair of electrodes 3a, 3b of the fluorescent lamp 10 having the rare gas sealed therein, whereby excitation of the rare gas is accelerated. |
