| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting fixture which can improve workability of a user and utilizes outdoor light in a simple structure. <P>SOLUTION: The lighting fixture 10 controls light output of an own lighting load 13 by a lighting fixture body 12 mounted on a ceiling 1, an illuminance sensor unit 18 which includes an illuminance sensor element and is arranged on an external peripheral edge of the lighting fixture body 12 and can be set at an arbitrary angle in the periphery direction against the center of the lighting fixture body 12, a lighting-up circuit unit section 11 for controlling the lighting load 13 on the basis of a signal of the illuminance sensor unit 18, and an output signal of the lighting-up circuit unit section 11. The illuminance sensor unit 18 respectively detects illuminance in a range directly under the lighting fixture and the illuminance in a range at an outer peripheral side from directly under the lighting fixture, and determines relative positions of the lighting load 13 and the illuminance sensor unit 18 to the outdoor light on the basis of differences of input obtained from respective ranges, and reports whether or not the illuminance sensor unit 18 is properly located on the basis of the relative positions. <P>COPYRIGHT: (C)2010,JPO&INPIT |
