Distance measuring equipment and camera

Abstract

There is disclosed a distance measuring equipment capable of performing efficiently a greater accuracy of focusing without troubling an operator, and a camera incorporating thereinto such a distance measuring equipment. By the use of the first focusing algorithm switches and set up to the turn-off state, the turn-off state and the contact side, respectively, so that AF-dedicated photo detector circuit performs once a ratio arithmetic processing in accordance with photo-currents I and I from the PSD . In case of the short distance area, they are dealt with as the focusing data. In case of the middle distance area, the ratio arithmetic processing is performed by n times. In case of the long distance area, by the use of the second focusing algorithm switches and set up to the turn-off state, the turn-on state and the contact side, respectively, so that the ratio arithmetic processing is performed in accordance with the photo-current I and the constant current I from the constant current source . In case of the longest distance area, by the use of the third focusing algorithm switches and set up to the turn-on state, the turn-off state and the contact side, respectively, so that the light quantity arithmetic processing is performed in accordance with the additional values of the photo-currents I and I and the constant current I to determine focusing data.