Lamp circuit apparatus

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 f...

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Bibliographic Details
Main Author HERRING; ROBERT W
Format Patent
LanguageEnglish
Published 02.07.1985
Edition3
Subjects
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
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Summary: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.
Bibliography:Application Number: US19820402717