Erwin Sick, Klaus Hartmann, Heinz Henneberger: Photo electric light detection devices. Erwin Sick Gesellschaft mit beschrankter Haftung Optik Elektronik, December 25, 1979: US04180702 (22 worldwide citation)

A photo electric light detection device comprising an array of photodiodes is disposed at an end face of a light conducting rod in order to produce an output signal proportional to light incident on the surface of the rod and transmitted to the end face by total internal reflection. The array of pho ...