Patent ID: 9549116
Date: 2017-01-17
CPC Classifications: G02B,G03B,H04N

Claim:
1. A focus adjustment device, having an image sensor for forming a subject image using light flux that has been received through a photographing lens and generating image signals, executes focus adjustment based on the image signals, and comprises: a focus detection region setting section for setting a plurality of focus detection regions of differing sizes, within a region in which an image is formed by the image sensor; a determination section, for detecting contrast of image signals within focus detection regions respectively relating to the plurality of focus detection regions, and determining change of a subject based on amount of change of the contrast and temporal change in amount of change of the contrast; and a control section for, in a case where the determination section has determined that there is subject change when a focus adjustment operation is stopped, starting the focus adjustment operation, wherein the determination section measures a first time, being a state where the change amount of the contrast value exceeds a first determination value, and determines change of a subject image when the first time exceeds a second determination value, and wherein the determination section sets second determination values that are different to respectively different first determination regions, for a plurality of focus detection regions of differing size.