| 摘要 |
PROBLEM TO BE SOLVED: To improve reduction or the like in the lifetime characteristics of a mercury-free metal halide lamp. SOLUTION: The metal halide lamp includes a discharge vessel 1, having a discharge space 14 and sealing sections 12a, 12b. The discharge vessel 1 contains a halogenated metal and rare gases, and a discharge medium without containing any mercury is sealed. A pair of electrodes 3a2, 3b2 is arranged opposingly in the discharge space 14, and ends at the side of the base part of the electrodes 3a2, 3b2 are joined to pieces of metal foil 3a1, 3b1, respectively. Lead wires 3a3, 3b3 are joined to the other end sides of the pieces of metal foils 3a1, 3b1. In this state, the pieces of metal foil 3a1, 3b1 are sealed airtightly by the sealing sections 12a, 12b. Irregular sections 4a, 4b are formed at a region including an area near the junction of the metal foil 4 and an electrode shaft 3a. The irregular sections 4a, 4b suppress the reaction of free halogen and a metal halide, thus extending the lifetime of the lamp. COPYRIGHT: (C)2008,JPO&INPIT |
