High intensity discharge lamp including arc extinguishing means

Details High intensity discharge lamp including arc extinguishing means High intensity discharge lamp including arc extinguishing means

1981-04-27

1982-12-07

Dixon, Harold A.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Electric switch inside evacuated or gas filled envelope

315119, 337413, H01J 744

Patent

active

043629695

ABSTRACT:
An arc extinguishing means for a high intensity discharge lamp comprises a meltable fuse wire a portion of which is surrounded by a refractory hollow sleeve of larger diameter than the fuse wire. The remaining volume of the sleeve is substantially filled with a pyrophoric material which, at an operating temperature available within the lamp, will spontaneously ignite in the presence of oxygen and generate sufficient heat to melt the fuse wire and thus open the circuit, extinguishing the lamp.

REFERENCES:
patent: 3211950 (1965-10-01), Cardwell
patent: 4013919 (1977-03-01), Corbley
patent: 4195251 (1980-03-01), Bamberg
patent: 4233542 (1980-11-01), Oostvogels et al.

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