A photosensor which is capable of detecting the direction of incidence as well as the intensity of optical radiation. The detector comprises an array of photodetector cells arranged under a diffuser dome. The direction of incidence of the optical radiation can be determined by a comparison of the...http://www.google.de/patents/US5670774?utm_source=gb-gplus-sharePatent US5670774 - Photosensor to detect the direction of incidence and intensity of optical radiation 
