Protective metal halide film for high-pressure electrodeless dis

Details Protective metal halide film for high-pressure electrodeless dis Protective metal halide film for high-pressure electrodeless dis

1990-03-05

1991-07-16

Yusko, Donald J.

Electric lamp and discharge devices

With temperature modifier

For envelope wall

313 46, 313635, 313489, 315248, H01J 6100, H01J 6133

Patent

active

050327577

ABSTRACT:
An electrodeless high intensity discharge lamp having an excitation coil disposed about an arc tube includes thermal apparatus for ensuring that a metal halide condensate forms a protective film on the portion of the arc tube which is nearest the plasma arc discharge during lamp operation. For a short, cylindrical arc tube, the thermal apparatus comprises a heat shield situated on the top and/or bottom thereof. In one embodiment, the bottom of the arc tube is concave to ensure that the condensate does not collect on the bottom of the arc tube. The excitation coil may be situated sufficiently close to the arc tube to ensure that enough heat is removed from the side wall of the arc tube to a heat sink so that the protective metal halide film forms on the inner surface of the arc tube wall. An outer glass envelope is preferably situated between the arc tube and the excitation coil, which envelope also functions to remove heat from the arc tube side wall.

REFERENCES:
patent: 1897586 (1933-02-01), Pirani
patent: 4342937 (1982-08-01), Nagel
patent: 4803404 (1989-02-01), Anderson
patent: 4810938 (1989-03-01), Johnson et al.
patent: 4812702 (1989-03-01), Anderson
patent: 4910439 (1990-03-01), El-Hamamsy et al.
patent: 4972120 (1990-11-01), Witting
Waymouth, John F., "Electric Discharge Lamps", M.I.T. Press, 1971, pp. 266-277.

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