U.S. Philips Corporation

Adriaan J De Ridder

Gijsbert H Kuus

A halogen incandescent lamp having a light-pervious envelope containing a gas filling comprising a rare gas, hydrogen and bromine. The envelope also contains a tungsten filament and an oxygen getter. The oxygen getter consists of an intermetallic compound of at least one first metal from the group consisting of Ta, Ti, Zr, Hf and Nb and at least one second metal from the group consisting of Pd, Pt and Au, but which intermetallic compound is not a tantalum-gold or a niobium-gold compound. These intermetallic compounds are sufficiently stable that although they react with oxygen, they do not react with hydrogen bromide. Consequently the presence of such an intermetallic compound in such a halogen incandescent lamp does not interfere with the tungsten-bromine cycle, and thus the maximum quantity of the intermetallic compound which is present in such a lamp is not critical.

Halogen incandescent lamp

A high-pressure discharge lamp having a hydrogen getter in the lamp vessel disposed in a metal envelope which is hydrogen-permeable. The hydrogen-permeable metal of the envelope is covered with a porous halogen-resistant layer. The atoms of the metal halides dissociated in the discharge can recombine at the porous layer so that blackening of the discharge vessel is mitigated.

High-pressure discharge lamp

A high-pressure discharge lamp having a hydrogen getter in a metal envelope of which only a part consists of a hydrogen-permeable metal. The getter is arranged in the lamp in such manner that the hydrogen-permeable part of the envelope faces the discharge.

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Eindhoven, Netherlands

Adriaan J De Ridder