Transparent heat conserving coating for metal halide arc tubes

Details Transparent heat conserving coating for metal halide arc tubes Transparent heat conserving coating for metal halide arc tubes

1994-10-31

1999-09-14

O'Shea, Sandra

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

H01J 6134

Patent

active

059527684

ABSTRACT:
A metal halide arc tube is provided having a light-transmitting envelope and electrodes for generating an arc discharge within a sealed chamber of the envelope. The envelope includes a transparent film at a cold region of the sealed chamber where metal halides migrate and condense. The transparent film transmits visible radiation and absorbs ultraviolet radiation emitted by the arc to impose an additional heat load on the cold region so that a high metal halide vapor pressure can be maintained. The temperature of a hot region of the envelope can be maintained at a lower level by reducing power input or increasing chamber surface area. Preferably, the transparent film reflects infrared radiation emitted by the light source back to the arc to increase efficiency and further increase the temperature of the cold region due to decreased thermal emittance. The transparent film is preferably a dichroic coating having alternating layers of high and low index of refraction refractory materials.

REFERENCES:
patent: 4047966 (1977-09-01), Bihuniak et al.
patent: 4307315 (1981-12-01), Meulemans
patent: 4368945 (1983-01-01), Fujimori et al.
patent: 4467238 (1984-08-01), Silverstein et al.
patent: 4639069 (1987-01-01), Yatabe et al.
patent: 4645290 (1987-02-01), Walsh
patent: 4949005 (1990-08-01), Parham
patent: 4987343 (1991-01-01), Kosmatka et al.
patent: 5017839 (1991-05-01), Arlt
patent: 5059865 (1991-10-01), Bergman
patent: 5196759 (1993-03-01), Parham et al.
patent: 5199785 (1993-04-01), Scholz
patent: 5221876 (1993-06-01), Bergman et al.
patent: 5239406 (1993-08-01), Lynam

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