Koninklijke Philips Corporation N.v.

Hendrik Dreuning

Peter Arend Seinen

Mark Bolech

Elisabeth Onnekes-Van Der Voort

Franciscus H Van Lierop

Martin F C Willemsen

The electric lamp has a ceramic lamp vessel ( ) having a filling of rare gas and metal halide. Current conductors ( ) which support electrodes ( ) inside the discharge vessel ( ) enter the discharge vessel ( ) in a gastight manner through a ceramic sealing compound ( ). At least one of the current conductors ( ) has inside the lamp vessel ( ) a first, halogen-resistant part ( ) which is selected from tungsten silicide, molybdenum aluminide, molybdenum boride, pentamolybdenum trisilicide and combinations of at least two of these intermetallic compounds. These compounds have a coefficient of thermal expansion which corresponds to that of the discharge vessel ( ). It is thereby prevented that the discharge vessel starts leaking if the ceramic sealing compound ( ) extends beyond the first part ( ). As a result of their coefficient of thermal expansion, the intermetallic compounds may constitute the second part ( ) of the current conductors ( ) as well, which part ( ) is surrounded by the ceramic sealing compound ( ) in a gastight manner.

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Eindhoven, Netherlands

Hendrik Dreuning