| 摘要 |
PROBLEM TO BE SOLVED: To provide an illumination device providing a high circuit efficiency in either normal time or at emergency time. SOLUTION: The illumination device is equipped with a light source 1 formed by connecting a plurality of light-emitting diodes LED in series, a regularly used lighting circuit 2 in which an AC voltage from a commercial power supply AC is rectified and smoothed, and the rectified and smoothed DC voltage is supplied to the light source 1, a chargeable emergency power supply BT, an emergency lighting circuit 3 in which a DC voltage from an emergency power supply BT is boosted during power failure to be supplied to the light source 1, a step-down circuit 4 in which the AC voltage from the commercial power supply AC is stepped down and converted to the DC voltage, and a charging circuit 5 in which the emergency power supply BT is charged by an output voltage from the step-down circuit 4. In this illumination device, output ends of the regularly used lighting circuit 2 are connected to both ends of a first light-emitting part 10 formed by connecting all the light-emitting diodes LED, and the output ends of the emergency lighting circuit 3 are connected to both ends of a second light-emitting part 11 formed by connecting a prescribed number of the light-emitting diodes LED which is smaller than that of the light-emitting diodes LED of the first light-emitting part 10. COPYRIGHT: (C)2009,JPO&INPIT
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