| 摘要 |
PURPOSE:To increase the quantity of light of a lamp at its starting time while simplifying also a power supply without lowering the restarting property of the lamp by changing the lighting frequency of the lamp given at the starting time thereof until the stable lighting condition of the lamp is established immediately after the lamp is lit to be lower than the lighting frequency of the lamp given when the stable lighting condition thereof is established so that impedance in a coil may be lessened. CONSTITUTION:When a pulse is applied by an inverter 2, a filled rare-gas causes dielectric breakdown to initiate electric discharge so as to promptly initiate its radiation. Then the gas increases the lighting frequency of a lamp in accordance with a change in a lamp voltage while the lamp reaches its steady condition. Namely, because impedance in a coil 3 becomes low at the starting time of the lamp when the frequency of an output from the inverter 2 is low, a current flowing through the lamp 4 becomes large in volume to promptly cause dielectric breakdown of the rare gas filled under high pressure so as to effectively obtain an optical output resulting from the electric discharge of the rare gas. |
