Patent ID: 8416336

Claim:
An image sensor, comprising: a plurality of imaging pixels, each constituted with a first micro-lens and a first photoelectric conversion element that receives, via the first micro-lens, an image-capturing light flux transmitted through a photographic optical system and executes photoelectric conversion on the received image-capturing light flux at a photoelectric conversion area in the first photoelectric conversion element; and a plurality of focus detection pixels disposed within a two-dimensional array of the plurality of imaging pixels, and made up with a plurality of first focus detection pixels each of which receives one light flux in a pair of focus detection light fluxes transmitted through the photographic optical system and a plurality of second focus detection pixels each of which receives the other light flux in the pair of focus detection light fluxes, the plurality of focus detection pixels each being constituted with a second micro-lens and a second photoelectric conversion element, wherein: the second photoelectric conversion element in each of the plurality of first focus detection pixels includes a first light-receiving area where the one light flux is received; the second photoelectric conversion element in each of the plurality of second focus detection pixels includes a second light-receiving area where the other light flux is received; light-receiving area images corresponding to each of the plurality of focus detection pixels are each formed as the first and second light-receiving areas are projected via the second micro-lens onto a pupil plane of the photographic optical system; a positional relationship of the second micro-lens and the first and second light-receiving areas is determined in correspondence to an image height so that the light-receiving area images corresponding to all the first focus detection pixels are superimposed on one another and that the light-receiving area images corresponding to all the second focus detection pixels are superimposed on one another on the pupil plane; and the second micro-lens assumes a circular shape viewed from the front and the first micro-lens assumes a substantially rectangular shape viewed from the front.