| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device with a fire spread prevention structure, capable of performing lighting control in accordance with brightness in the surroundings. <P>SOLUTION: The lighting device 10 is provided with a metal casing 15 with a daylighting hole 32 on an upper face side and an opening on a lower side. The daylighting hole 32 of the casing 15 is occluded with a translucent member 36. The opening on the lower side of the casing 15 is covered with a metal fitting plate 17 to form a housing space 16 between the casing 15 and the fitting plate 17. LED elements are arranged on the lower side of the fitting plate 17. In the housing space 16, there are arranged an illuminance sensor 60 for detecting external light incident through the translucent member 36 from the daylighting hole 32 as well as a lighting circuit 56 for putting on the LED elements based on detection by the illuminance sensor 60. <P>COPYRIGHT: (C)2013,JPO&INPIT |
