Patent ID: 8711270

Claim:
A focus detection device, in which a plurality of pixels are arranged, each pixel having a photoelectric conversion unit for converting an incident light flux into signal charges and a microlens having a focus position near the photoelectric conversion unit, comprising: signal lines which are used to read out signals converted from the signal charges, wherein the plurality of pixels include a plurality of imaging pixels for generating an image, and a plurality of focus-detecting pixels for generating an image signal for focus detection by a phase-difference focus detection method, wherein the signal lines comprise first signal lines and second signal lines, the first signal lines being arranged to limit incident light flux for the plurality of focus-detecting pixels in a first direction that is a predetermined pupil-divided direction, and the second signal lines being arranged to extend in a second direction that is perpendicular to the first direction, wherein a width of an opening, which is formed between the first signal lines, in the first direction is narrower than a width of an opening that limits incident light flux for an imaging pixel in the first direction, and wherein a distance between the first signal lines and the photoelectric conversion unit is shorter than a distance between the second signal lines and the photoelectric conversion unit.