Discharge lamp having fuse-switch guard against jacket failure

Details Discharge lamp having fuse-switch guard against jacket failure Discharge lamp having fuse-switch guard against jacket failure

1975-08-04

1977-03-22

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Electric switch inside evacuated or gas filled envelope

315 49, 315 74, 315 85, H05B 41231, H01J 744

Patent

active

040139190

ABSTRACT:
The inner arc tube of some jacketed discharge lamps transmits ultraviolet radiation which is normally absorbed without harm by the glass outer envelope but may be released should the outer envelope be broken off. This is prevented by a fuse heater and shunting thermal switch connected in series with the arc tube and located within the outer envelope. Should the outer envelope be broken, air cools the switch so that it opens. Current flow through the heater now raises its temperature and causes it to oxidize, thereby opening the circuit and disabling the lamp.

REFERENCES:
patent: 2020737 (1935-11-01), Pirani et al.
patent: 2899583 (1959-08-01), Macksoud

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