Lamp with light-source capsule support members having equal ther

Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope

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Details

313 40, 313 46, 313631, H01J 546, H01J 6134, H01J 6136, H01K 140

Patent

active

047587598

ABSTRACT:
A single-ended lamp having a double-ended light-source capsule mounted axially within an outer envelope on thermally conductive support members such that the amount of heat conducted to the base region of the lamp through each support member is approximately equal. In a preferred embodiment, a high-pressure sodium PAR lamp having a temperature-sensitive component in the lamp base employs two support wires for the arc tube; the support wire coupled with the arc tube end closer to the lamp base has a loop formed therein so that the lengths of both support wires are approximately equal and the thermal conductivity of both support wires are also approximately equal in the operating environment of the lamp; whereby the temperature-sensitive component operates within acceptable temperature limits. In alternate embodiments, each support member may employ one or more loops or other configurations in order to minimize the amount of heat transferred to the lamp base through conduction in the support members. The invention has particular application in lamps having temperature-sensitive components or materials in the base region of the lamp, or where the temperature of the lamp socket or its surroundings is particularly constrained.

REFERENCES:
patent: 4015158 (1977-03-01), Roller et al.
patent: 4253037 (1981-02-01), Driessen et al.

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