| 摘要 |
<p>PURPOSE:To detect the position of a moving light source by detecting the posi tion of the moving light source by a photodetection part and performing a simple arithmetic based upon the photodetection output. CONSTITUTION:A couple of detection parts Ai and A-i are provided on a plane H which extends along X axis, and equipped with a stop member 4 and a divided photodetection part 2 respectively. Respective photodetection elements generate photodetection outputs Ri and Li, and L-i and L-i and arithmetic of a number 1 is performed to find the coordinates (xo, z0) of the moving light source by the simple calculation.</p> |
