| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a danger of short-circuiting on secondary side of a transformer, while the device is miniaturized. SOLUTION: This device is equipped with a discharge lamp La and a piezoelectric transformer 2 by which a high voltage is generated at a power generating part 4 by applying an alternate current voltage to a driving part 3 and electric power is transmitted to the discharge lamp La. In this case, while the piezoelectric transformer 2 is formed in a thin plate, the discharge lamp La is made of a direct tube type, and while the discharge lamp La is close mounted so that at least a part of it confronts to the power generating part 4 of the piezoelectric transformer 2, a cable of an outside connection line 6 is connected only to the driving part 3 of the piezoelectric transformer 2, a driving circuit 5 which oscillates in the neighborhood of a frequency close to a resonance frequency of the piezoelectric transformer 2 is connected to the driving part 3 of the piezoelectric transformer 2, so that lighting of the discharge lamp La is maintained by activating the piezoelectric transformer 2 in the neighborhood of a frequency close to the resonance frequency to transmit electric power from the power generating part 4 to the discharge lamp La. |
