Holding Rod
The invention discloses a holding rod 20, 22 for a discharge lamp 2 , in particular a mercury vapor or xenon short-arc lamp, for holding an anode 24 or cathode 26 in an interior 6 of a discharge vessel 4 , the holding rod 20, 22 containing doped molybdenum or tungsten doped with at least one metal oxide compound. Furthermore, the invention discloses a discharge lamp having such a holding rod 20, 22.
1 . A holding rod for a discharge lamp ( 2 ), in particular a mercury vapor or xenon short-arc lamp, for holding an anode ( 24 ) or cathode ( 26 ) in an interior ( 6 ) of a discharge vessel ( 4 ), characterized in that the holding rod ( 20 , 22 ) contains doped molybdenum.
2 . The holding rod as claimed in claim 1 , the holding rod ( 20 , 22 ) containing potassium as the dopant.
3 . The holding rod as claimed in claim 2 , the volume content of potassium being approximately 100 ppm to approximately 400 ppm, preferably approximately 280 ppm.
4 . The holding rod as claimed in claim 1 , the holding rod ( 20 , 22 ) being annealed above 1800° C., preferably at 2400° C.
5 . A holding rod for a discharge lamp ( 2 ), in particular a mercury vapor or xenon short-arc lamp, for holding an anode ( 24 ) or cathode ( 26 ) in an interior ( 6 ), characterized in that the holding rod ( 20 , 22 ) contains tungsten doped with at least one metal oxide compound.
6 . The holding rod as claimed in claim 5 , the metal oxide compound being lanthanum oxide.
7 . The holding rod as claimed in claim 5 , the metal oxide compound being yttrium oxide.
8 . The holding rod as claimed in claim 5 , the metal oxide compound being rhenium oxide.
9 . A discharge lamp having at least one holding rod ( 20 , 22 ) as claimed in claim 1 .
10 . The holding rod as claimed in claim 2 , the holding rod ( 20 , 22 ) being annealed above 1800° C., preferably at 2400° C.
11 . The holding rod as claimed in claim 3 , the holding rod ( 20 , 22 ) being annealed above 1800° C., preferably at 2400° C.