U.S. Philips Corporation

Germain R T'Jampens

Henricus F Giller

Jan De Ridder

Friedrich Hermann Almer

Abraham Coomans

The headlight latern system comprises laterns with a rectangular pane having a height of less than 60 mm and a flattened concave reflector, in which a filament is arranged in a narrow tubular envelope. The filament has a very high color temperature and is surrounded by gas of very high pressure. The system produces a light beam which is superior to the beam of conventional headlight lanterns of considerably larger dimensions.

Headlight lantern system and electric lamp for this system

The invention relates to a high-pressure metal halide lamp in which the filling of the discharge vessel also comprises an alkali metal. The discharge vessel is surrounded by an outer envelope. One electrode of the discharge vessel is connected to a current supply conductor extending between the discharge vessel and the outer envelope. A plate-shaped element is mounted between the discharge vessel and the outer envelope in such manner that, viewed from the discharge vessel, the current supply conductor is present substantially entirely behind the plate-shaped element. According to the invention, the plate-shaped element comprises boron nitride. Increase of the arc voltage of the lamp and increase of the color temperature of the radiation emitted by the lamp is prevented in this manner.

High-pressure discharge lamp having shielding means comprised of boron

A tungsten/bromine cycle lamp having a metal getter containing compounds of the formula MeNH.sub. x Br.sub.x+1, TaBr.sub.5 C.sub.5 H.sub.5 N or the decompositions products thereof. These compounds can be accurately dosed. They present the advantage that getter and reactive gas can be introduced into the lamp in mutually matched quantities and in one operation.

Tungsten/bromine cycle lamp

A tungsten/bromine cycle lamp having a metal getter containing compounds of the formula Me NH.sub.x Br.sub.x+1, Ta Br.sub.5 C.sub.5 H.sub.5 N or the decompositions products thereof. These compounds can be accurately dosed. They present the advantage that getter and reactive gas can be introduced into the lamp in mutually matched quantities and in one operation.

Halogen incandescent lamp having a gas filling comprising dibromonethane (CH.sub.2 Br.sub.2) and carbontetrachloride (CCl.sub.4).

Halogen incandescent lamp whose filler gas comprises bromine, chlorine

Electric tungsten/bromine cycle lamps are provided according to the invention with 2,2-diamino-4,4,6,6-tetrabromo-2,2,4,4,6-hexahydrotriazaphosphine, 2-amino-2,4,4,6,6-pentabromo-2,2,4,4,6,6-hexahydrotriazaphosphine or mixtures thereof as a phosphorusbromine-hydrogen source. It has been found that these non-corrosive compounds present a very flexible possibility for dosaging the various types of lamps.

Electric tungsten/bromine cycle lamp and method of manufacturing said

In a two-pinch halogen lamp having an axial filament and an envelope diameter of less than 3.5 mm the envelope diameter is chosen as a function of the envelope and filament temperature, the coil diameter and the filling pressure.

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Eindhoven, Netherlands

Germain R T'Jampens