Compact high-pressure discharge lamp and method of manufacturing

摘要

A high-pressure discharge lamp has an outer envelope ( 1 ) in which a discharge vessel ( 11 ) is arranged enclosing a discharge space ( 13 ) with an ionizable filling. The discharge vessel has two mutually opposed neck-shaped portions ( 2,3 ) through which current supply conductors ( 4, 5 ) extend to a pair of electrodes ( 6, 7 ) in the discharge space. A lamp base ( 8 ) of electrically insulating material supports the discharge vessel. The lamp base also supports the outer envelope. The outer envelope with a volume equal to or less than 2 cc encloses the current supply conductors and is connected to the lamp base in a gas-tight manner. A getter ( 10 ) is provided in the outer envelope for pumping out residual nitrogen from the outer envelope after sealing off the discharge lamp prior to operation of the discharge lamp, the getter ( 10 ) comprising at least 2.5 mbar.ml nitrogen. Preferably, the getter comprises an alloy of zirconium and aluminum or of zirconium and cobalt.