| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect light of light-emitting elements with light-receiving elements through reduction of adverse effects of outside light. <P>SOLUTION: For a plane illumination device 1 provided with a reflector for a plane illumination device 14 with a plurality of concave reflecting faces 16 connected each having an LED 10 arranged at bottom parts of the concave reflecting faces 16, the reflector for a plane illumination device 14 is structured to be provided with concave parts 32 each communicated with at least one or the other concave reflecting face 16 at a rear-face side of a connection point P to which the concave reflecting face 16 is connected at a surface side, and a light-receiving element 30 is arranged at the concave part 32 for detecting light H of the LED 10 arranged at the concave reflecting face 16 communicated with the concave part 32 in question. <P>COPYRIGHT: (C)2013,JPO&INPIT |
