Image-capturing device and image sensor

Abstract

An image-capturing device includes an image sensor. The image sensor includes an upper layer pixel group and a lower layer pixel group that receives the light fluxes from the subject that have passed through each pixel in the upper layer pixel group. The lower layer pixel group includes fourth, fifth and sixth pixels having fourth, fifth and sixth spectral sensitivities, respectively, that are complementary to first, second, and third spectral sensitivities, respectively, of the upper layer pixel group, being arranged in a two-dimensional pattern. Positions of first, second and third pixels in the upper layer pixel group and positions of the fourth, fifth and sixth pixels in the lower layer pixel group are determined such that the fourth, fifth and sixth pixels receive light fluxes that pass through the first, second and third pixels, respectively.

1 . An image-capturing device comprising:
 an image sensor that captures an image of a subject with light fluxes from the subject that have passed through an imaging optical system;   an image generation unit that generates an image signal based upon an output signal from the image sensor; and   a focus detection unit that detects a focusing condition of the imaging optical system according to a phase detection method based upon an output signal from the image sensor, wherein   the image sensor includes
 an upper layer pixel group and a lower layer pixel group that receives the light fluxes from the subject that have passed through each pixel in the upper layer pixel group, and 
 a microlens group arranged so as to guide the light fluxes from the subject to the upper layer pixel group, wherein 
 the upper layer pixel group includes first, second and third pixels having first, second and third spectral sensitivities, respectively, differing from each other, and being arranged in a two-dimensional pattern, with one of the first pixels, one of the second pixels and two of the third pixels being arranged in a two-by-two matrix behind each of microlenses in the microlens group, and the four pixels receive four light fluxes, respectively, that pass through four pupil areas, respectively, of an exit pupil of the imaging optical system, 
 the lower layer pixel group includes fourth, fifth and sixth pixels having fourth, fifth and sixth spectral sensitivities, respectively, that are complementary to the first, second, and third spectral sensitivities, respectively, of the upper layer pixel group, being arranged in a two-dimensional pattern, and 
 positions of the first, second and third pixels in the upper layer pixel group and positions of the fourth, fifth and sixth pixels in the lower layer pixel group are determined such that the fourth, fifth and sixth pixels receive light fluxes that pass through the first, second and third pixels, respectively, 
   the image generation unit generates the image signal based upon an output signal from one of the upper layer pixel group and the lower layer pixel group, and   the focus detection unit detects the focusing condition based upon an output signal from other of the upper layer pixel group and the lower layer pixel group.