Arc discharge lamp containing mechanism for extinguishing arc at

Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium

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313493, 313631, H01J 61067, H01J 6130, H01J 6142

Patent

active

052104613

ABSTRACT:
An arc discharge lamp having an end-of-life structure and including a light-transmissive envelope having a tubular-shaped main body and a press seal disposed at each end of the main body. An electrode filament having a pair of ends is located in each end of the envelope. Each electrode filament end is in a contiguous relationship with an inside surface of the lamp envelope. When one of the electrode filaments is depleted of electron-emissive material, increased heating of the electrode filament caused by an increase in cathode fall voltage, produces a localized hot spot on the internal surface of the envelope. This localized heating causes a puncture in the lamp envelope and evacuation of the lamp. The introduction of external atmosphere into the lamp extinguishes the arc discharge and renders the lamp inoperable.

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patent: 4752710 (1988-06-01), Devir et al.

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