High temperature lamps having UV absorbing quartz envelope

Details High temperature lamps having UV absorbing quartz envelope High temperature lamps having UV absorbing quartz envelope

1992-02-28

1993-03-23

DeMeo, Palmer C.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

313579, 313580, 313636, H01K 132, H01J 6130

Patent

active

051967596

ABSTRACT:
Fused quartz containing both titanium dioxide and cerium oxide as UV absorbing dopants has been found to be particularly effective for lamp envelopes for high temperature lamps such as halogen-incandescent lamps and metal halide arc discharge lamps which emit both UV and visible light radiation. The codoped quartz transmits visible radiation and absorbs a substantial portion of the emitted UV radiation. The UV absorption is far superior at temperatures above 500.degree. C. and the codoped quartz does not react with the fill within.

REFERENCES:
patent: 2774903 (1956-12-01), Burns
patent: 3253174 (1966-05-01), Elmer et al.
patent: 3531677 (1970-09-01), Loughridge
patent: 4935668 (1990-06-01), Hansler et al.

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