Focus detection apparatus, image pickup device, and electronic camera
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United States of America Patent
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Jan 21, 2014
Grant Date -
Dec 2, 2010
app pub date -
May 4, 2010
filing date -
May 26, 2009
priority date (Note) -
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Abstract
A focus detection apparatus includes first-type and second-type pixels and an image-formation-state detector. Each first-type pixel includes a photoelectric converter that receives light from an image-pickup optical system and first and second optical members arranged on an optical path from the optical system to the photoelectric converter and having different refractive indices, and outputs a first charge signal corresponding to an amount of light received by the photoelectric converter. Each second-type pixel includes the photoelectric converter and the first and second optical members arranged such that a positional relationship relative to the photoelectric converter differs from that in each first-type pixel, and outputs a second charge signal corresponding to an amount of light received by the photoelectric converter. The detector detects an image formation state of the image-pickup optical system on the basis of the first and second charge signals.
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