U.S. Philips Corporation

Henricus F Giller

Germain R T'Jampens

Bauke J Roelevink

Antonius J Van Hees

Jacobus A Heijboer

The electrical reflector lamp according to the invention has a blown lamp vessel (1) comprising a light-transmitting part (4) opposite to a neck-shaped part (3). The lamp vessel (1) has a first mirror-coated lamp vessel portion (5), which has a spherically curved part (14) and a paraboloidally curved part (15), and further a second mirror-coated lamp vessel portion (7), which is curved paraboloidally. A paraboloidally curved reflector (8) is arranged in the neck-shaped lamp vessel portion (3). The foci of the paraboloidal parts and the reflector and the center of the spherical part coincide (6). The light source is arranged in a plane (12) through the foci (6) and transversely to the axis of symmetry (2) of the lamp vessel (1). A very large part of the generated light is irradiated by the lamp in a concentrated beam.

Electrical reflector lamp

The electric reflector lamp according to the invention has a blown glass lamp envelope, of which a concave internally mirror-coated wall portion, a translucent wall portion and a tubular wall portion constitute a single blow moulding. Within the lamp envelope is arranged a metal reflector body, which has a concave spherically curved reflecting surface facing the mirror-coated wall portion. Its axis and its center of curvature coincide with the axis and the focus, respectively, of the mirror-coated wall portion. A light source surrounds the focus. The lamp does not or substantially does not, emit stray light and concentrates the generated light very effectively.

Electric reflector lamp

An electric reflector lamp according to the invention has a blown lamp envelope comprising a concave internally mirror-coated wall portion, a spherical internally mirror-coated wall portion opposite thereto, an annular translucent wall portion between the first two portions and a tubular wall portion at the apex of the concave wall portion. These wall portions constitute a single blow moulding. The axes of the mirror-coated wall portions coincide, just like their focus and center of curvature, around which a light source is arranged. The concave wall portion is parabolic or elliptic, the second focus lying outside the lamp envelope. The parts of the mirror-coated wall portions, which throw light rays after at most two reflections through the translucent wall portion to the exterior, surround the focus through a solid angle of more than 1.5 .pi.sr. The spherical wall portion constitutes a mask which prevents light rays from the light source from reaching the translucent wall portion other than after reflection. The lamp does not emit stray light and very effectively concentrates the radiated light.

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.

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.

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Eindhoven, Netherlands

Henricus F Giller