Discharge lamp having thermal switch starter

Details Discharge lamp having thermal switch starter Discharge lamp having thermal switch starter

1975-09-02

1977-01-04

La Roche, Eugene

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Electric switch inside evacuated or gas filled envelope

315 47, 315 74, 315103, 315104, H01J 6156

Patent

active

040016340

ABSTRACT:
A high pressure sodium vapor lamp utilizing an alumina ceramic arc tube within an outer glass envelope is provided with a bi-metal switch which short circuits the arc tube at starting. Current flow through the switch causes it to heat up and open the short circuit, producing a voltage pulse which starts the lamp. The bi-metal is fastened to a pin conductor extending from the metal exhaust tube of the arc tube to the frame. The pin conductor, which receives heat by conduction from the exhaust tube and is also heated by lamp current flow, transmits sufficient heat to the bi-metal to maintain it deflected during normal operation.

REFERENCES:
patent: 2286789 (1942-06-01), Dench
patent: 3226597 (1965-12-01), Green
patent: 3746914 (1973-07-01), Olson et al.

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