| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas discharge tube wherein a startup property is made better while realizing a high luminance. SOLUTION: In a gas discharge tube 1, a convergence electrode part 14 and an electricity discharge restriction part 30 are electrically insulated, and the discharge restriction part 30 has a discharge restriction opening 31 to oppose to a concave part 16 for arc ball molding, thereby formation of a discharge path from a negative electrode part 20 to the concave part 16 is made to be sure, and accompanied with this, it becomes possible to generate a startup discharge surely. Further, by the discharge restriction opening 31 made to be opposed to the concave part 16, an arc ball S can be continued to maintain an appropriate shape, and a stabilization of luminance and amount of light can be aimed at by enabling a stable molding of the arc ball S.
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