Circuit with two photocells and chopping means having openings related to photocell spacing

Claim 1

A PHOTOCONDUCTIVE CELL CIRCUIT FOR USE IN A MODULATED LIGHT FIELD, COMPRISING IN COMBINATION: A FIRST PHOTOCONDUCTIVE CELL, D.C. VOLTAGE SOURCE MEANS CONNECTED ELECTRICALLY IN SERIES WITH SAID FIRST PHOTOCONDUCTIVE CELL, A SECOND PHOTOCONDUCTIVE CELL CONNECTED ELECTRICALLY IN SERIES WITH SAID FIRST PHOTOCONDUCTIVE CELL AND SAID D.C. VOLTAGE SOURCE MEAND AND ARRANGED PHYSICALLY IN THE SAME PLANE AND IN SIDE-BY-SIDE RELATIONSHIP WITH SAID FIRST PHOTOCONDUCTIVE CELL, LIGHT SOURCE MEANS, LIGHT CHOPPER MEANS INTERPOSED BETWEEN SAID LIGHT SOURCE MEANS AND SAID FIRST AND SECOND PHOTOCONDUCTIVE CELLS FOR CONTINUOUSLY SWEEPING INDIVIDUAL BEAMS OF LIGHT OVER SAID FIRST AND SECOND PHOTOCONDUCTIVE CELLS, SAID CHOPPER MEANS HAVING OPENINGS EQUAL TO THE DISTANCE BETEEN SAID CELLS MULTIPLIED BY THE RATIO OF THE LIGHT-TO-CHOPPER DISTANCE TO THE LIGHT-TO-CELLS DISTANCE SUCH THAT EACH OF SAID BEAMS RISES ON ONE OF SAID PHOTOCONDUCTIVE CELLS AS IT FALLS ON THE OTHER OF SAID PHOTOCONDUCTIVE CELL MEANS, AND MEANS FOR MEASURING AND AMPLIFYING THE VOLTAGE ACROSS ONE OF SAID CELLS.