H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/45
H05B 35/00 (2006.01) H01J 61/96 (2006.01) H05B 41/04 (2006.01)
Patent
CA 1091760
COMBINATION DISCHARGE-INCANDESCENT LAMP WITH THERMAL SWITCH CONTROL ABSTRACT A combination lamp comprises a miniature arc tube, a standby filament and a thermal switch in a sealed vitreous envelope. The switch is connected in series with the filament, and the arc tube and the filament have separate inleads for ex- ternal connections. The switch is closed at room temperature, allowing the filament to light up immediately at a cold start and providing an instant-on feature. During normal operation, heat and light radiated by the arc tube cause the switch to open and turn off the filament. The small size of the arc tube favors a heat balance which allows the thermal switch to cool and re- close quickly in the event of a current interruption, thereby assuring lighting after an acceptably brief delay in the event of a hot restart.
314830
Company General Electric
Eckersley Raymond A.
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