| 摘要 |
PURPOSE:To have easy lighting/starting with low impression voltage by providing molybdenum foil in close contact with the outer wall of a light emitting tube, and by constituting so that the width of molybdenum foil is specifically related to the wall thickness of the light emitting tube. CONSTITUTION:By a molybdenum wire 21, molybdenum foil 20 is fixed to a lead 14 in close contact with the exterior surface of a quartz light emitting tube 11 and put in electrical contact with an electrode 18. Here the construction is such that d>=0.6a, where d is width of molybdenum foil, and a wall thickness of light emitting tube. Mercury, halide metal, and xenon gas for lighting/starting are encapsulated in the light emitting tube 11. At the time of lighting/starting, an electrode near the ground potential is impressed on the electrode 18 and a stretching voltage on another electrode 17, and now discharge destruction will occur in the space between the electrode 17 and foil 20. Because the width of foil 20 is sufficient, fine discharge generated around the electrode 17 propagates easily along the foil 20 to attain the electrode 18.
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