Patent attributes
A focus adjustment apparatus includes an imaging device for capturing object images via a photographing lens; a lens driving device which moves a focusing lens group; a manual focus adjustment device which actuates the lens driving device to move the focusing lens group in response to a manual operation; a focus detection device for making the imaging device capture an object image to determine a contrast value thereof each time the focusing lens group moves by a predetermined amount of movement due to the manual operation, and for detecting an in-focus position of the focusing lens group in accordance with contrast values detected by the focus detection device at different lens positions; and a controller which moves the focusing lens group to the in-focus position via the lens driving device if a deviation exists between a stopped position and the in-focus position.
