Patent ID: 8633992
Filing Date: 2014-01-21
Classification: G02B,G03B,H04N

Abstract:
1. A focus detection device, comprising: a focus detection unit that includes a pair of light-receiving element arrays and lens systems via which a pair of focus detection light fluxes obtained by pupil-splitting transmitted light transmitted through a photographic optical system are each guided to one of the pair of light-receiving element arrays, and detects an image shift amount based upon output signals output from the pair of light-receiving element arrays by adopting a split-pupil phase method; an acquisition unit that obtains a plurality of sets of opening data pertaining to sizes and positions of a plurality of openings that restrict the transmitted light at the photographic optical system; a function value calculation unit that calculates, based upon the plurality of sets of opening data, a function value pertaining to a gravitational center distance between gravitational centers of a pair of overlapping areas where a pair of specific focus detection pupils determined in correspondence to the lens systems and the pair of light-receiving element arrays at the focus detection unit overlap an exit pupil of the photographic optical system; and a conversion unit that converts the image shift amount to a defocus amount based upon the function value calculated by the function value calculation unit.