Camera focusing devices

Claim 1

IN A RANGE FINDER, IN COMBINATION, A PAIR OF OPTICAL MEANS RESPECTIVELY SITUATED ADJACENT THE JUNCTIONS BETWEEN THE BASE OF A PREDETERMINED TRIANGLE AND THE SIDE THEREOF, SAID SIDES OF SAID TRIANGLE INTERSECTING DISTANT FROM SAID BASE AT THE SUBJECT AND SAID SIDES OF SAID TRIANGLE RESPECTIVELY COINCIDING WITH THE OPTICAL AXES OF SAID PAIR OF OPTICAL MEANS; A PAIR OF PHOTOSENSITIVE TRANSDUCERS CONSPECTIVELY RECEIVING LIGHT FROM BEAMS WHICH EXTEND ALONG SAID OPTICAL AXES, SAID PHOTOSENSITIVE TRANSDUCERS CONSTRUCTED AND ARRANGED SO AS TO EFFECT THE PRODUCTION OF EQUAL SIGNALS ONLY IN RESPONSE TO IMPINGEMENT OF IDENTICAL LIGHT BEAMS OF EQUAL INTENSITY AND EQUAL CONFIGURATION IN IDENTICAL LOCATIONS ON SAID PHOTOSENSITIVE TRANSDUCERS WHILE IN THE EVENT OF IMPINGEMENT OF LIGHT BEAMS OF UNEQUAL INTENSITY AND EQUAL CONFIGURATION IN IDENTICAL LOCATIONS OR OF EQUAL INTENSITY AND EQUAL OR UNEQUAL CONFIGURATION IN DIFFERENT LOCATIONS ON SAID PHOTOSENSITIVE TRANSDUCERS THE PRODUCTION OF DIFFERENT SIGNALS WILL BE EFFECTED; AND MEANS FOR COMPARING THE THUS PRODUCED SIGNALS FOR DETERMINING THEIR RELATIVE CHARACTERISTICS.