Patent ID: 9380203
Filing Date: 2016-06-28
CPC Classification: G02B,G03B,H04N

Claim Text:
1. A focusing device comprising: an imaging element which includes an imaging plane; an imaging lens which includes focus lens groups, which includes first and second focus lens groups, and forms an image of a subject on the imaging plane of the imaging element to enable focus adjustment; a focus evaluation value detecting section which detects a focus evaluation value based on an image signal acquired by imaging of the imaging element; and a control section which moves the focus lens groups based on the focus evaluation value, effects a wobbling operation of the first focus lens group to focus on the subject, and moves the second focus lens group while effecting the wobbling operation of the first lens group for one period alone so that image surface positions of the focus lens groups are moved by predetermined amounts, wherein the control section offsets a center position of an amplitude of the wobbling operation of the first focus lens group by a first amount in a moving direction of the second focus lens group and adds a second amount to the amplitude of the wobbling operation thereby increasing the amplitude of the wobbling operation in both a moving direction of the second focus lens group and against the moving direction of the second focus lens group while moving the second focus lens group.