Patent ID: 9264605
Filing Date: 2016-02-16
CPC Classification: G02B,H04N

Claim Text:
1. A focus adjustment unit, having a photographing lens that includes a focus lens, for carrying out a focus adjustment operation based on image data that is generated by receiving light of a pupil divided subject image by means of the photographing lens and subjecting the received light to photoelectric conversion, comprising: a phase difference detection section for detecting extreme values having a high degree of correlation, based on the image data, a periodicity-containing subject determination section for determining a periodicity-containing subject in the case where the phase difference detection section detects many extreme values having a high degree of correlation, and a control section for, when a periodicity-containing subject has been determined, determining whether or not a difference between a position of the focus lens shown by an extreme value corresponding to a position that is closest to a current focus lens position, among extreme values having a high degree of correlation, and the current focus lens position, is outside a specified range, and if it is determined that the difference is outside the specified range, carrying out a focus adjustment operation based on the extreme value corresponding to the position that is closest to the current position of the focus lens.