Electric lamp and discharge devices – With gas or vapor – With particular gas or vapor
Patent
1998-06-04
2000-12-05
Patel, Ashok
Electric lamp and discharge devices
With gas or vapor
With particular gas or vapor
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.
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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.
Butler James E.
Giuliani, Jr. John L.
Shamamian Vasgen A.
Vestyck, Jr. Daniel J.
Edelberg Barry A.
Gerike Matthew J.
Karasek John J.
Patel Ashok
The United States of America as represented by the Secretary of
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