Photodetector, photosensing position detector, coordinate input device, coordinate input/output apparatus, and photodetection method

摘要

A photodetector includes a photoreceiving unit which receives a light beam that blinks a plurality of times per detection period and coverts the received light beam into an output signal. A signal processing and control unit controls the photoreceiving unit so that the output signal increases in strength as a blinking cycle count increases in each detection period.