An electrodeless discharge lamp lighting device

PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp lighting device, capable of operating an electrodeless discharge lamp having frequency characteristics with a proper output frequency in combination with an exciting coil. SOLUTION: A control circuit 7a is provided for the electrodeless discharge lamp lighting device including the electrodeless discharge lamp 1, a DC power supply 2, a power converter 3 for converting a DC power from the DC power supply 2 into a high-frequency power according to a control signal, the exciting coil 4 for receiving the high-frequency power converted by the power converter 3 and having a high-frequency electromagnetic field act on the electrodeless discharge lamp 1, and an oscillator 6 for outputting an oscillation signal as the control signal. The control circuit 7a is composed of an output detector 71a for detecting an output of the power converter 3 and a frequency control circuit 73a for controlling frequencies of the oscillation signal of the oscillator 6 so that the detected output is set to a predetermined output. A limit part 731a for limiting the variable range of the frequencies controlled by the frequency control circuit 73a to a predetermined range is provided in the frequency control circuit 73a. COPYRIGHT: (C)2004,JPO