| 摘要 |
PURPOSE:To stably supply a high frequency power and miniaturize a device by interposing a DC cut capacitor in the closed circuit of the second capacitor of a pi type impedance reversing circuit and a high frequency power feeding coil. CONSTITUTION:A tank circuit 5 resonated with a used frequency is formed of a resonance inductor L1 and a resonance capacitor C3, and an amplified high frequency voltage is applied to a type impedance reversing circuit 4. The circuit 4 is formed of the first capacitor C3, an inductor L2, and a second capacitor C5, and a high frequency voltage is applied to a high frequency power feeding coil 2 wound on the outer circumference of an electrodeless discharge lamp 1 through a DC cut capacitor C2. According to this constitution, since the capacitor C2 is not contained in the circuit elements of the circuits 4, 5, a bad effect on the resonance circuit by the shifting of the resonance frequency from the used frequency and the heating by the loss of the capacitor C2 can be prevented, and the number of circuit part items can be also reduced to minimize the device. |
