| 摘要 |
PROBLEM TO BE SOLVED: To provide a rare gas discharge lamp capable of reducing a spatial part in end edge part of an external electrode and effectively suppressing dielectric breakdown between the external electrodes or to the earth by a simple structure. SOLUTION: This discharge lamp is equipped with a straight pipe-shaped enclosure 1 having a luminous layer 2 on its inner surface and a sheet structure 3 wherein a pair of strip-shaped external electrodes 5, 6 comprising metallic members are disposed so as to be spaced apart from each other on one surface of an insulating translucent sheet 4 having a length substantially of the same order as the total length of the enclosure 1 such that a first and a second opening part 7, 8 are formed. An opening angleθ1 of the first opening part 7 is set to be larger than an opening angleθ2 of the second opening part 8 while wall thicknesses of the external electrodes 5, 6 are set in the range of 10 to 40μm, and the sheet structure 3 is wound around an outer peripheral surface of the enclosure 1 such that the external electrodes 5, 6 are positioned between the enclosure 1 and the translucent sheet 4.
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