US Patent 7792420 Focus adjustment device, imaging device and focus adjustment method

A focus adjustment device includes an image sensor that includes imaging pixels for capturing an image formed via an imaging optical system and focus detection pixels for detecting a focus adjustment state at the imaging optical system, a focus detector that detects a focus adjustment state at the imaging optical system, and a focus adjustment controller that executes focus adjustment for the imaging optical system based upon the focus adjustment states detected with the image sensor and the focus detector.