Lamp circuit apparatus

Details Lamp circuit apparatus Lamp circuit apparatus

1982-07-28

1985-07-02

Dixon, Harold

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Multiple filament load devices

315 68, 315 88, 315 89, H01J 744

Patent

active

045270953

ABSTRACT:
A lamp and lamp circuit apparatus are provided in which the lamp has a plurality of filaments operable one filament at a time and driven by a plurality of filament drivers. A filament failure detector circuit is operatively connected to one or more filament drivers for detecting the failure of the filament being driven. A circuit actuates a second filament in the multiple filament bulb when the filament failure detector detects failure of one filament, so that a lantern, and especially flashing lanterns, can have an extended lamp life.

REFERENCES:
patent: 3725728 (1973-04-01), King
patent: 3855587 (1974-12-01), Jacobs
patent: 3964040 (1976-06-01), Behl

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