High intensity discharge lamp including arc extinguishing means

Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Automatic shunt circuit closing or cut-out switch

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315 49, 315119, 315362, H01J 744

Patent

active

043762590

ABSTRACT:
A high intensity discharge lamp includes, within the outer envelope, a strip of niobium foil serially connected between a power source and one of the electrodes of the arc tube of the lamp. The foil is not a power consuming element but will oxidize and open the circuit, thus extinguishing the lamp, in the event the outer envelope is ruptured.

REFERENCES:
patent: 1987711 (1935-01-01), Robinson
patent: 2007927 (1935-07-01), Braselton
patent: 2745284 (1956-05-01), Fitzgerald
patent: 4013919 (1977-03-01), Corbley
patent: 4195251 (1980-03-01), Bamberg
patent: 4233542 (1980-11-01), Oostvogels et al.

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