High intensity discharge lamp containing iron and silver in the

Details High intensity discharge lamp containing iron and silver in the High intensity discharge lamp containing iron and silver in the

1988-11-10

1990-05-29

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

313642, 313565, H01J 6120

Patent

active

049298690

ABSTRACT:
In order to maintain an ultraviolet-ray intensity of a metal halide lamp for a long period, the present invention provides a high intensity discharge lamp comprising an arc tube having electrodes at its both ends, and a rare gas, mercury, iron, a halogen and silver enclosed in the tube, wherein a gram atom ratio of silver to iron is 0.05 to 0.2. The present invention also provides a high intensity discharge lamp comprising an arc tube having electrodes at its both ends, and a rare gas, mecury, iron, a halogen, tin and silver enclosed in the tube, wherein ([Fe]+[Sn])/[J]<0.5 and (2[Fe]+2[Sn]+[Ag])/[J]>1, where [Fe], [Sn], ]Ag] and [J] are, respectively, gram atoms of iron, tin, silver and the halogen.

REFERENCES:
patent: 3590307 (1971-06-01), Dobrusskin
patent: 3781586 (1973-12-01), Johnson

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