| 摘要 |
PURPOSE:To enable optimum frequencies to be set when starting up an electrodeless discharge lamp and when keeping the lamp turned on so as to achieve high efficiency and miniaturization of a device by controlling the electrodeless discharge lamp from a started state to a lighted-up state by the switching of first and second power supply means from one to the other. CONSTITUTION:A power supply means 1b supplying sufficient power to a high- frequency power supply coil 2 to start up an electrodeless discharge lamp 3 and having high frequencies, and a power supply means 1c supplying sufficient rated power to the coil 2 to keep the discharge lamp 3 lighted-up and having low frequencies, are provided. A switching element SW1 is switched so that at the startup of the discharge lamp 3 the means 1b supplies power to the coil 2, and so that when the lamp is being lighted-up the means 1c supplies power to the coil 2. Therefore, optimum frequencies can be set when starting up the discharge lamp 3 and when keeping the lamp lighted-up resulting in the increased efficiency and miniaturization of a device. |
