Patent ID: 7782392

Claim:
An autofocus adjustment device, comprising: a distance-measuring device which measures a distance from an object; an image pickup device which converts an optical image of the object taken in through an image pickup lens to an image signal; a focus adjustment device of a contrast system which adjusts a focus position of the image pickup lens using a high frequency component of the image signal outputted from the image pickup device; an area setting device which sets an object area for adjusting the focus position of the image pickup lens in the contrast system according to image pickup conditions, wherein the image pickup lens is driven according to a measurement result of the distance-measuring device, and then the focus adjustment device adjusts the focus position according to the image signal outputted from the image pickup device within the object area set by the area setting device; and wherein a range for adjusting the focus position is determined according to the measured result from the distance-measuring device, a brightness of the object, and a focal length of the autofocus adjustment device and the focus position is within the range.