Device for focus detection with weightings of the focus detecting signals of plural focus detectors

摘要

A focus detecting device arranged to evaluate the focused state of an object's image by using an image signal obtained from an image sensor comprises: a first detecting circuit which detects the maximum differential value of the image signal; a second detecting circuit which detects the width of an edge part of the object's image; and an evaluation circuit which is arranged to evaluate the focused state of said object's image by suitably combining, according to a focused degree detected, the detection values produced from the first and second detecting circuits.