Miniature projection lamp

H - Electricity – 05 – B

Patent

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Details

H05B 31/02 (2006.01) H01J 61/86 (2006.01)

Patent

CA 2239319

A high performance miniature projection lamp which includes a glass envelope having a pair of opposite neck portions each with a coaxial central opening having a reduced section and an hermetically sealed central chamber having a volume of about 130 mm3 which contains a fill. The fill includes an argon pressure at room temperature at a range of about 0.5 atmospheres to about 2.0 atmospheresand mercury in an amount in the range of about 5 mg to about 15 mg, and a mixture of metal halide material in an amount from about 50 up to 1000 micrograms. A pair of axially aligned electrodes are positioned at opposite neck portions and separated form each other by a predetermined distance. The electrodes each have a shank portion which each having a coil wrapped around its end.

Lampe de projection miniature haute performance à enveloppe de verre. Au niveau du col, celle-ci présente une paire de sections opposées comportant chacune une ouverture centrale coaxiale de section réduite et un compartiment central hermétique d'environ 130 mm3 qu'occupe un matériau de remplissage. Ce dernier comporte les éléments suivants : de l'argon sous pression, à environ 0,5 à 2,0 atmosphères à la température de la pièce; du mercure dans une proportion d'à peu près 5 à 15 mg; et un mélange de matériaux aux halogénures dans une proportion de 50 à 1000 microgrammes. Deux électrodes alignées dans le sens de l'axe et placées sur les sections opposées du col, sont séparées l'une de l'autre par une distance prédéterminée. Ces électrodes sont munies d'une tige à l'extrémité de laquelle est enrobé un filament.

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