FOCUS DETECTION DEVICE, FOCUS ADJUSTMENT DEVICE AND IMAGING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a focus detection device that enables focus detection of the same accuracy as with a conventional contrast detection method to be performed without wobbling.SOLUTION: The focus detection device comprises: a first light reception element array upon which one of a pair of fluxes of light transmitting a pair of areas respectively on an exit pupil of an image formation optical system is incident; a second light reception element array upon which other of the pair of the fluxes of light is incident; a composition part that composes an image of a scheduled focus plane and images of two imaging planes parallel with the scheduled focal plane, respectively on the basis of light reception signals to be outputted respectively from the first light reception element array and the second light reception element array; and a first detection part that detects a focus adjustment status of the image formation optical system on the basis of three images composed by the composition part.