| 摘要 |
PURPOSE: To improve a condition related to lighting instability such as lighting start dispersion and discharge lamp flicker by arranging a power supply approximately at the intermediate section of a lighting system, and laying a plurality of inverters in such a state as divided around the power supply. CONSTITUTION: A power supply 3 is provided approximately at the intermediate section of a printed circuit board 1. Furthermore, two-circuit inverters 57 are laid at the side where quick-coupling terminals 12 and 14 are provided. Also, a three-circuit inverter 58 is provided at the side where quick-coupling terminals 11, 13 and 15 are laid. In this case, the arrangement of each component of the circuits 57 and 58 is such that major inverter formation parts are laid approximately symmetrical right and left, with a control section 9, a switching element 8, an oscillation choke 5, a resonance choke 6, a quick-coupling terminal and the like laid around the power supply 3. Similarly, the pattern wiring of the board 1 forms approximately symmetrical arrangement right and left. Thus, high-frequency power from each inverter circuit can be fed to each discharge lamp without redundant pattern wiring. Also, a plurality of inverter circuits are formed on the board 1 in such a state as divided. |
