High-pressure mercury discharge lamp

Details High-pressure mercury discharge lamp High-pressure mercury discharge lamp

H - Electricity

01

J

313/135

H01J 61/36 (2006.01) H01J 5/46 (2006.01)

Patent

CA 1135781

1 PHN 9362 ABSTRACT: High-pressure mercury discharge lamps with metal halide addition often reach the end of life prematurely as a result of leakage of the pinch seal. According to the invention this is prevented by coating a metal foil which is incorporated as a current lead-through conductor in a pinch seal with a layer of a second metal which is Ti, Y, La, Sc and Hf. If a part of an external current conductor situated in the pinch seal is also formed, at least at its surface, from one of the said second metals, it prevents alkali metals escaping from the filling inside the discharge vessel.

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