Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope
Patent
1995-11-28
1996-11-19
Arana, Louis M.
Electric lamp and discharge devices
With temperature modifier
Double wall, jacket or casing for envelope
313 11, 313 17, 313634, H01J 102, H01J 724, H01J 6152, H01J 1716
Patent
active
055765920
ABSTRACT:
In a metal halide arc discharge lamp having a light emitting arc discharge tube surrounded by a heat absorbing, light transmissive shroud hermetically sealed within an outer lamp envelope, more nearly isothermal operation of the arc tube surface is achieved by using a shroud having a geometry (e.g., a hollow frustum of a cone) such that the shroud is closer to the cooler portions of the arc tube than to the hotter portions. At steady state lamp operation, the shroud absorbs heat emitted by the arc tube and radiates a portion of the absorbed heat back to the arc tube. By having a shroud geometry and spacing such that the inner surface of the shroud is closest to the coolest portions of the arc tube and furthest away from the hottest portions of the arc tube, the shroud radiates more heat back to the cooler portions, thereby providing more nearly isothermal operation of the surface of the arc tube than can be accomplished with a coaxial, cylindrical shroud or no shroud.
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Koenigsberg William D.
Shea Michael J.
Zaslavsky Gregory
Arana Louis M.
Haynes Mack
McNeill William H.
Osram Sylvania Inc.
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