| 摘要 |
PURPOSE:To make it possible to safely perform fixing to and taking down from a lighting equipment with no danger of damage even when large force is applied to the side of a discharge tube by more widening a gap between the fellow discharge tubes combined near the base said end part of plural pairs of discharge tubes than the tip part side of the end side provided with the base. CONSTITUTION:Discharge tubes 1 and 2 are located on both ends of a discharge path while both are not directly combined. The discharge tubes 1 and 4 are combined at a coupling part 7 provided near the tip part and the discharge tubes 2 and 3 are also similarly coupled through a coupling part 8 near the tip part to be connected through. The discharge tubes 3 and 4 are coupled by a coupling part 9 provided near the stem side end part to be connected through. Further, a gap on the side of a fixing part of the base 11 of the discharge tubes 3 and 4 is made wider than the gap on the tip part side. Thereby, danger of damage of the coupling part 9 is extremely scarce even when load is applied to the tip parts of the discharge tubes 3 and 4 in the direction to make them to near each other.
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