Title: Discharge lamp having fuse-switch guard against jacket failure

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.

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Inventors: Corbley, Eugene K. (Cleveland Heights, OH, US)

Application Number: 601858
Filing Date: 1975-08-04
Publication_date: 1977-03-22
Assignee: General Electric Company (Schenectady, NY)
Primary Class(es): 315/73 315/49, 315/74, 315/85
Other Classes:
US Patent Ref:

2020737	Nov, 1935	Pirani et al.	315/49.
2899583	Aug, 1959	Macksoud	313/485.

Other Refs: 1,051,948267,753

Dec, 1966	UK.
Apr, 1970	SU.

Primary Examiner: LaRoche, Eugene R.
Assistant Examiner:
Attorney: Legree; Ernest W., Kempton; Lawrence R., Neuhauser; Frank L.