| 摘要 |
PURPOSE:To reduce a noise trouble to equipments inside or outside lighting apparatus by symmetrically arranging individual electrical discharge lamps with a lighting circuit as the center, and minimizing the total sum of momentary current with the direction of the momentary current flowing in individual electrical discharge lamps adjusted. CONSTITUTION:A lighting circuit 2 is installed in the middle, electrical discharge lamps 1a-1d are symmetrically arranged at the right and left of the circuit 2, and the momentary total sum of the current, flowing in individual electrical discharge lamps 1a and 1b or electrical discharge lamps 1c and 1d in one side, is minimized. Concurrently the momentary total sum of the current, flowing in the lamps 1a and 1b and 1c and 1d paired and arranged at the right and left, is also minimized. This enables a magnetic field to be reduced with the magnetic field by the current, flowing in the individual electrical discharge lamps symmetrically arranged to the lighting circuit, countervailed, and thereby the noise trouble to equipments inside or outside lighting apparatus can be reduced. |
