| 摘要 |
It is aimed at providing a metal halide lamp including sealed metal foils embedded within sealing portions, each metal foil having surfaces formed with height differences thereon, thereby restricting occurrence of crack leaks in the sealing portions. A metal halide lamp MHL comprises: a light-transmitting hermetic vessel 1 made of quartz glass, including: a surrounding portion 1a having a discharge space 1c formed therein; and at least one sealing portion 1b joined to the surrounding portion 1a; electrodes 2 sealed within the discharge space 1c of the light-transmitting hermetic vessel 1; a discharge medium filled within the discharge space 1c of the light-transmitting hermetic vessel 1, and containing at least a halide of light emitting metal and a rare gas; and at least one sealed metal foil 3 connected to proximal ends of the electrodes 2 and hermetically embedded within the or each sealing portion 1b of the light-transmitting hermetic vessel 1, the or each sealed metal foil being formed with height-differentiating portions on at least one of surfaces of the or each metal foil by means of laser process.
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