A plurality of photosensors are provided as light measuring elements at respectively different positions within a space between an optical unit and an image sensor so as to be outside the optical path of the direct light from a photographic subject entering through an optical unit. The plurality of photosensors...http://www.google.com.tw/patents/US7075578?utm_source=gb-gplus-share專利 US7075578 - Digital camera with flash emission control
