Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Electric switch inside evacuated or gas filled envelope
Patent
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.
Collister, Jr. Richard L.
Corbley Eugene K.
General Electric Company
Kempton Lawrence R.
La Roche Eugene
Legree Ernest W.
Neuhauser Frank L.
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