| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device capable of supervision and information notification at external power supply cutoff.SOLUTION: A lighting device 11 includes a light source 16, a battery 17 and a power supply 20. The power supply 20 includes a charging circuit 31, an emergency lighting circuit 32 and a radio signal transmission unit 36. The charging circuit 31 charges the battery 17. The emergency lighting circuit 32 lights the light source 16. The radio signal transmission unit 36 periodically transmits a radio signal. When the external power supply 18 is not cut off, the power supply 20 uses the external power supply 18 as a power supply for the charging circuit 31 and the radio signal transmit unit 36, whereas when the external power supply 18 is cut off, the power supply 20 uses the battery 17 as a power supply for the emergency lighting circuit 32 and the radio signal transmission unit 36.SELECTED DRAWING: Figure 1 |
