Patent ID: 8558940

Claim:
An image sensor comprising: a plurality of image-capturing pixels that, upon each receiving a partial light flux within a predetermined wavelength range, which is part of a photographic light flux used to form an optical image, output image signals corresponding to the optical image, each of the plurality of image-capturing pixels having an image-capturing photoelectric conversion unit that converts the partial light flux received thereat to an image signal among the image signals, the plurality of image-capturing pixels having first image-capturing pixels and second image-capturing pixels, each of the first image-capturing pixels having a first color filter through which a light flux in a first wavelength range set as the predetermined wavelength range is transmitted, each of the second image-capturing pixels having a second color filter through which a light flux in a second wavelength range set as the predetermined wavelength range different from the first wavelength range is transmitted; a plurality of focus detection pixels that receive a pair of focus detection light fluxes in a wider wavelength range than the predetermined wavelength range and output a pair of focus detection signals, each of the plurality of focus detection pixels having a focus detection photoelectric conversion unit that converts a focus detection light flux received thereat in the focus detection light fluxes to a focus detection signal among the focus detection signals, the wider wavelength range of the focus detection light fluxes including the first wavelength range and the second wavelength range; and a reduction unit that adjusts a signal level of the focus detection signals output from the plurality of focus detection pixels so as to ensure that the signal level of the focus detection signals, each output from one of the plurality of focus detection pixels under a given light receiving condition, is equal to or less than a signal level of the image signals each output from one of the plurality of image-capturing pixels under the given light receiving condition, the reduction unit including a light reducing unit that reduces an amount of light in the focus detection light flux received at the focus detection photoelectric conversion unit, wherein: each of the plurality of focus detection pixels includes a micro-lens; the light reducing unit includes a light reducing filter disposed between the focus detection photoelectric conversion unit and the micro-lens; and the light reducing filter reduces an amount of light for a light flux in a substantially full visible light wavelength range.