Lighting failure detector for a luminaire
AssigneeKagatsu Kabushiki Kaisha
InventorsToshitaka Noriki, Kaoru Tanaka, Hiroki Shinzaki
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Abstract
A lighting failure detector for a luminaire which ascertains that a lamp is lit at night and indicates the result of detection includes a phase difference detector circuit for ascertaining the lighting of the lamp through voltage and current applied to the lamp, a timer operating in response to an output signal from the phase difference detector circuit, and an indicator operated in response to a time-up signal from the timer.
Claims2
A lighting failure detector for a luminaire, comprising a phase difference detector circuit for ascertaining the lighting of a lamp through voltage and current applied to the lamp, a timer operating in response to an output signal from the phase difference detector circuit, and an indicator operated in response to a time-up signal from by the timer.
Dependencies are inferred from the claim text.