| 摘要 |
PURPOSE: To improve the igniting characteristic, and to lower the interfering current to be generated from a discharge lamp to a power source side by connecting an igniting antenna to a free end of a second coil and an end of a first coil. CONSTITUTION: A needle-like antenna 14 is installed in a free end 13 of a second coil 12 for arrangement. The antenna 14 is electrically insulated from both coils 6, 12, and stretched at a length corresponding to the length of both the coils. Furthermore, an antenna 15 is installed in an end 15 separated from a free end 13 of the coil 16. As this antenna 15, a needle-like antenna is used, and stretched over the length of the coil, and electrically insulated from both the coils. The antenna 15 is connected to the coil 16 for fixation at a position near a first turn. In this case, since an electrical potential difference between both the antennas 14, 15 becomes the maximum, a discharge lamp is easily lighted. Since the two coils are formed into the double-structure, the interfering current to be returned to a power source becomes the minimum. Furthermore, since both the antennas have opposite polarity to each other, the interfering current to be returned to the power source is remarkably reduced. |
