Object distance detecting apparatus

摘要

An object distance detecting apparatus having a light projecting device for projecting a pulse light toward an object to be photographed and a primary semiconductor position detecting device for receiving the reflected light from the object by this light projecting device and outputting a first current value and second current value corresponding to the object distance, comprising: a first integrating circuit for integrating a predetermined number of times the added value of the above-mentioned first current value and second current value, a second integrating circuit for integrating a predetermined number of times the ratio operating value of the above-mentioned both current values, a first calculating device for calculating the object distance on the basis of the square of the output of the above-mentioned first integrating circuit and a second calculating device for calculating the object distance on the basis of the output of the above-mentioned second integrating circuit so that, when the output of the first calculating means shows a distance nearer than a predetermined value, the output of the above mentioned second calculating device will be made a definite distance value but, when the output of the first calculating device shows a distance farther than the predetermined value, the output of the above-mentioned first calculating device will be made a definite distance value.