Metal-halide discharge lamp having a ceramic discharge...

H - Electricity – 01 – J

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Details

H01J 5/32 (2006.01) H01J 5/04 (2006.01) H01J 61/36 (2006.01)

Patent

CA 2241714

At least at one end of a discharge lamp, for example a metal-halide discharge lamp or a sodium high-pressure discharge lamp, which has a ceramic discharge vessel (4), a feed-through (9, 10; 30) is provided which includes a cermet. The cermet may be in pin or capillary tube form, and has a metal content which is so high that it can be welded like a metal. The cermet can be directly sintered into an end plug (26) or into an end portion (34a, 34b) of the vessel itself. The seal thus is effected by a sealing arrangement (11, 21, 34a, 34b, 31) devoid of glass melt, which would be degraded by attack of corrosive fills within the lamp, while additionally having the capability of withstanding higher operating temperatures.

Lampe à décharge, par exemple lampe aux halogénures ou lampe à sodium à haute pression, ayant un tube à décharge (4) en céramique dont au moins l'une des extrémités est munie d'une traversée (9, 10; 30) comportant un élément en cermet, lequel peut prendre la forme d'une tige ou d'un tube capillaire et présente une teneur en métal suffisamment élevée pour permettre de le souder. Cet élément en cermet peut être fritté directement dans une des fermetures (26) ou dans une des extrémités (34a, 34b) du tube à décharge. Le dispositif d'étanchéité (11, 21, 34a, 34b, 31) est ainsi exempt de verre fondu, susceptible d'attaque par le contenu corrosif de la lampe, et capable de résister à des températures de fonctionnement plus élevées.

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