Optical transducer for measuring distance

Claim 1

IN AN OPTICAL TRANSDUCER, A SINGLE LIGHT SOURCE, A DOUBLE CYLINDER REFLECTOR MOUNTED ON ONE SIDE OF SAID LIGHT SOURCE TO CENTRALLY LOCATE SAID LIGHT SOURCE IN SAID REFLECTOR TO THEREBY PRODUCE A PAIR OF COLUMNS OF LIGHT SPACED AT A PREDETERMINED DISTANCE; A SLIT PLATE MOUNTED ON THE OTHER SIDE OF SAID LIGHT SOURCE, SAID SLIT PLATE HAVING A PAIR OF OPEN ELONGATED SLITS FORMED THEREIN AND SPACED AT SAID PREDETERMINED DISTANCE TO THEREBY ACCEPT AND FURTHER DEFINE SAID COLUMNS OF LIGHT; A CODE PLATE MOVABLY MOUNTED WITH RESPECT TO SAID COLUMNS OF LIGHT AND MOUNTED IN THE CLOSE PROXIMITY TO SAD SLIT PLATE ON THE SIDE THEREOF OPPOSITE SAID LIGHT SOURCE, SAID CODE PLATE INCLUDING A PLURALITY OF ROWS OF CODED LIGHT TRANSMITTING SECTIONS THEREON TO BE ILLUMINATED BY SAID COLUMNS OF LIGHT; THE SECTIONS OF SAID CODE PLATE BEING REPEATABLE AND SAID PREDETERMINED DISTANCE BEING SOME MULTIPLE OF THE LENGTH OF A REPEATABLE SECTION PLUS AN ADDITIONAL LENGTH EQUAL TO ONE HALF OF THE LENGTH OF A LIGHT TRANSMITTING SECTION OF THE LOWEST ORDER INFORMATION; A PAIR OF COLUMNS OF PHOTOELECTRIC SENSORS MOUNTED ON THE SIDE OF SAID CODE PLATE WHICH IS OPPOSITE FROM SAID SLIT PLATE, SAID COLUMNS OF SENSORS BEING SPACED APART SAID PREDETERMINED DISTANCE IN ALIGNMENT WITH SAID COLUMNS OF LIGHT; AND ELECTRONIC MEANS CONNECTED TO BE CONTROLLED BY SAID SENSORS TO PROVIDE A CODED OUTPUT SIGNAL INDICATIVE OF RELATIVE MOVEMENT BETWEEN SAID CODE PLATE AND SAID COLUMNS OF LIGHT.