Electric lamp and discharge devices – With gas or vapor – With particular gas or vapor
Patent
1991-07-18
1993-11-23
DeMeo, Palmer C.
Electric lamp and discharge devices
With gas or vapor
With particular gas or vapor
313640, H01J 6120
Patent
active
052647609
ABSTRACT:
To maintain a predetermined design color temperature throughout the lifet of a metal halide high-pressure discharge lamp, particularly suitable for illumination of theaters, film or television studios, the discharge vessel of the high-pressure lamp, typically made of quartz glass, contains a fill which, besides mercury, has a noble gas, cesium and dysprosium halide and a nickel halide. Optionally, gadolinium halide may be used. Per cubic centimeter of volume of the discharge vessel, 0.03 to 3 mg dysprosium, 0.002 to 0.5 mg nickel, and, optionally, 0.002 to 0.1 mg gadolinium are suitable. Suitable halogens for the halides are iodine and bromium, preferably in a mol relationship between 0.2 and 1.5. The metals, nickel and gadolinium limit the color temperature drop-off over the average lifetime of the lamp to at the most 1 K per operating hour of the lamp.
REFERENCES:
patent: 3566178 (1971-02-01), Mori
patent: 3654506 (1972-04-01), Kuhl et al.
patent: 4243906 (1981-01-01), Wilson
patent: 4647814 (1987-03-01), Dobrusskin et al.
patent: 4978884 (1990-12-01), Van Vliet et al.
Genz Andreas
Kiele Walter
DeMeo Palmer C.
Patent-Treuhand-Gesellschaft fur Elektrische Gluehlampen mbH
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