http://egami.blog.so-net.ne.jp/2011-11-09(in Japanese, Google-translated English Page Here)The principle is to make the sensor reflective so that a portion of the light is reflective upward to the phase-detection AF module and then to the OVF (which is switchable to an EVF as desired). This patent is interesting enough and can overcome the two utmost shortcomings of the current ILDC design. But
