| 摘要 |
<p>A pair of detecting stations Ai and A-i on a plane H extends along an axis X. Each of the detecting stations is provided with an iris member and a divided light receiving section. Received light outputs at each of the light receiving elements are defined as Ri, Li, R-i, and L-i, and the following equation is calculated to enable a coordinate (x0, z0) of the moving light source to be attained by a simple calculation: Si=(Ri-Li)/(Ri+Li)+(R-i-L-i)/(R-i+L-i); Ti=(Ri-Li)/(Ri+Li)-(R-i-L-i)/(R-i+L-i).</p> |
