DISTANCE DETECTION DEVICE USING FOCUS DETECTION DEVICE

摘要

PURPOSE:To detect an object distance even if a focus is not brought into an object by obtaining the extension quantity of a photographic lens from the position of infinity to the position of an object based on the extension quantity of the photographic lens from the position of infinity to the current position and the defocusing quantity to the object. CONSTITUTION:The extension quantity N of the photographic lens 11 from the position of infinity to the current position is detected and also the focusing state of the photographic lens 11 is detected so as to calculate the defocusing quantity DF to the object. And the distance (x) is calculated based on the extension quantity N and the defocusing quantity DF calculated in a defocusing quantity calculation means 2. Thus, the object distance (x) can be obtained even if the focus of the photographing lens 11 is not brought into the object.