Patent ID: 8634017
Filing Date: 2014-01-21
Classification: H04N

Abstract:
1. A focus detection apparatus, comprising: a plurality of first-type pixels, each first-type pixel including a photoelectric converter, a first optical member, and a second optical member, the photoelectric converter being configured to receive light from an image-pickup optical system and perform photoelectric conversion, the first and second optical members being arranged on an optical path from the image-pickup optical system to the photoelectric converter and having different refractive indices, each first-type pixel outputting a first charge signal corresponding to an amount of light received by the photoelectric converter; a plurality of second-type pixels, each second-type pixel including a photoelectric converter, a first optical member, and a second optical member, the photoelectric converter being configured to receive light from the image-pickup optical system and perform photoelectric conversion, the first and second optical members having different refractive indices and being arranged on an optical path from the image-pickup optical system to the photoelectric converter such that a positional relationship between the first and second optical members and the photoelectric converter in each second-type pixel differs from a positional relationship between the first and second optical members and the photoelectric converter in each first-type pixel, each second-type pixel outputting a second charge signal corresponding to an amount of light received by the photoelectric converter; and an image-formation-state detector configured to detect an image formation state of the image-pickup optical system on the basis of the first charge signals and the second charge signals, wherein,