Focus detecting apparatus jointly employing outputs of plural diverse detectors

摘要

In an automatic focusing apparatus, a focus detecting device having detecting means for detecting the width of the edge part of the image of an object to be photographed and discriminating means for discriminating a focused state on the basis of the size of the detected width is arranged to determine by the discriminating means the apparatus to be out of focus when the width of the edge part of the object image is wide and to be in focus when the width of the edge part is narrow, so that the focus detecting device can operate without being affected by difference in the kind and the contrast of the object to be photographed.