Metal oxide discharge lamp

Electric lamp and discharge devices – With gas or vapor – With particular gas or vapor

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313607, H01J 1720, H01J 6118, H01J 1100

Patent

active

061571334

ABSTRACT:
A sealed, metal oxide, electrodeless discharge lamp having a high emission ntensity in the visible 400-700 nm range. Within the sealed container assembly of the lamp there is a source of metal atoms capable of forming a volatile oxide and a source of an oxygen containing gas. The lamp produces a plasma and volatilizes the metal into the plasma. Preferably the lamp is at a low pressure of about 20-40 torr and the metals are molybdenum or tungsten. Power is applied by inductively coupled electromagnetic radiation. A regenerative agent such as a halogen is added for recycling any deposited metal into the gas phase and to form a volatile compound with the source of metal atoms. The agent lowers the temperatures needed to volatilize the metal into the plasma. The lamp is operated by first providing energy at a low level to initiate the plasma and then supplying the metal atoms into the plasma.

REFERENCES:
patent: 4114064 (1978-09-01), Ernsthausen
patent: 4205392 (1980-05-01), Byrum, Jr. et al.
patent: 4451765 (1984-05-01), Gray
patent: 4890042 (1989-12-01), Witting
patent: 5086258 (1992-02-01), Mucklejohn et al.
patent: 5158709 (1992-10-01), Setti
patent: 5191460 (1993-03-01), Lapatovich
J. R. Coaton et al, "Tungsten-halogen lamps and regenerative mechanisms" by IEEE Proc., vol. 127, Pt., A, No. 3, Apr. 1980, pp. 142-148.

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