Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope
Patent
1981-09-03
1984-08-21
Moore, David K.
Electric lamp and discharge devices
With temperature modifier
Double wall, jacket or casing for envelope
313113, 313635, H01J 6134, H01J 6138
Patent
active
044672381
ABSTRACT:
The efficacy of a high-pressure sodium lamp is increased significantly by enlarging the arc tube diameter and deploying a composite infrared-reflective film on the interior of the outer lamp envelope. The infrared-reflective film acts to maintain the wall temperature of the enlarged arc tube at the same optimum temperature as the arc tube wall in a conventional high-pressure sodium lamp. In one embodiment, the IR reflective film is a multi-layer composite film of In.sub.2 O.sub.3 :Sn or SnO.sub.2 :F overcoated with a TiO.sub.2 or SiO.sub.2 dielectric film. In another embodiment, a three-layer composite film is made up of TiO.sub.2, In.sub.2 O.sub.3 :Sn, or SnO.sub.2 :F, and SiO.sub.2 films sequentially overlaid on the outer envelope. The dielectric films improve lamp efficacy and enhance the high temperature chemical stability of In.sub.2 O.sub.3 :Sn and SnO.sub.2 :F. Such IR reflective films are substantially transparent to radiation in the visible region of the spectrum, but are highly reflective in the infrared portions of the spectrum.
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Liu, C. S., "Heat Conservation System for Arc Lamps", Jr. of IES, Jul. 1979, pp. 220-225.
Waymouth, J. F. et al., "Analysis of Factors Affecting Efficacy of High Pressure Sodium Lamps", Jr. of IES, Jul. 1981, pp. 237-244.
Prener Jerome S.
Silverstein Seth D.
Davis Jr. James C.
General Electric Company
Krauss Geoffrey H.
Moore David K.
Snyder Marvin
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