Automatic focusing device

摘要: An automatic focusing device by which the intensity distribution of an image object to be photographed is detected a detecting section having accumulation mode sensor with charge time in dependence upon brightness and develop video signal corresponding distribution. A processing circuit processes determine whether optical system photographing apparatus associated focused or out focus when out-of-focus condition drive direction developed applied move lens proper toward position. The for only predetermined at each detection that low high without interruption until irrespective varying response being photographed.