US Patent 7783185 Image sensor, imaging device and imaging method

An image sensor includes imaging pixels that convert an image formed via an optical system to image signals and a first focus detection pixel group and a second focus detection pixel group respectively made up with an array of first focus detection pixels and an array of second focus detection pixels, with the first focus detection pixels and the second focus detection pixels used to receive an image light flux via the optical system to detect a focus adjustment state at the optical system through a pupil division-type method. An image detection pitch of the first focus detection pixel group and an image detection pitch of the second focus detection pixel group are different from each other.