Patent ID: 8730373
Filing Date: 2014-05-20
Classification: G02B,G03B,H04N

Abstract:
1. An image forming apparatus comprising: an image sensor comprising a plurality of pixels at least part of which form a plurality of focus detection pixel pairs, each receiving light rays passing through different pupil areas of an image forming optical system; a detection unit configured to detect a defocus amount, based on a phase difference between signals output from the plurality of focus detection pixel pairs in a focusing area; a judging unit configured to determine if a subject corresponds to a predetermined pattern; and a focus control unit configured to drive the image forming optical system to be in an in-focus state, based on the defocus amount detected by the detection unit, wherein the judging unit determines if the subject corresponds to the predetermined pattern, based on the signals output from the pixels other than the focus detection pixel pairs around the plurality of focus detection pixel pairs in the focusing area, and changes focus control, performed by the focus control unit, based on the determination result.