Koninklijke Philips Corporation N.v.

Joseph F R Eijsermans

Dorothea Seebode

Angela J&ouml;rres

Marcus Kubon

Manfred Peterek

The high-pressure discharge lamp comprises a sealed lamp vessel ( ) having a quartz glass wall ( ) enclosing a discharge space ( ). Metal foils ( ) are embedded in the wall, connected to electrode rods ( ) projecting from the wall into the discharge space. The electrode rods ( ) have a first part ( ) and a second part ( ). The second part is made of tungsten with a diameter of 120 to 180 &mgr;m or molybdenum with a diameter of 120 to 350 &mgr;m, or tungsten-molybdenum mixtures with a diameter of 120 to 350 &mgr;m. The second part, which is positioned within the wall ( ), prevents premature failure of the lamp caused by leakage.

High pressure discharge lamp with tungsten electrode rods having first and second parts

The high-pressure discharge lamp comprises a sealed lamp vessel ( ) having a quartz glass wall ( ) enclosing a discharge space ( ). Metal foils ( ) are embedded in the wall, connected to electrode rods ( ) projecting from the wall into the discharge space. The electrode rods ( ) have a first part ( ) and a second part ( ) with a diameter of between 250 and 350 &mgr;m and at least an envelope ( ) made of rhenium. The second part, which is positioned within the wall ( ), prevents premature failure of the lamp caused by leakage.

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Eindhoven, Netherlands

Joseph F R Eijsermans