| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-costed emergency lighting system improved in visibility. SOLUTION: The emergency lighting system A comprises: a LED block 1 formed of a plurality of light-emitting diodes arranged along the edge of a light guiding board arranged in the back surface of a display panel; a charge/discharge circuit 4 for charging a secondary battery 3 by receiving supply from a commercial power source AC; a lighting circuit 5 for supplying lighting power to the LED block 1 by receiving the power supply from the commercial power source AC in electrical continuity and for supplying lighting power to the LED block 1 by receiving power supply from the secondary battery 3 through the charge/discharge circuit 4 in interruption of service; and a control circuit 8 for controlling output of the lighting circuit 5 so as to turn on the LED block 1 with a constant optical output in normal operation where an abnormality informing signal, which reports the outbreak of a fire and an interruption of service, is not input and for controlling output of the lighting circuit 5 so as to periodically change optical output of the LED block 1 when the abnormality informing signal is input. COPYRIGHT: (C)2009,JPO&INPIT
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