Exposure control device for a photographic camera

Claim 1

IN A CAMERA, AN OBJECTIVE, AUTOMATIC EXPOSURE CONTROL MEANS INCLUDING A PRIMARY PHOTOELECTRIC CELL FOR ACTUATING THE CONTROL MEANS, MEANS FOR SHADING SAID PRIMARY PHOTOELECTRIC CELL TO FORM A PREDETERMINED ACCEPTANCE ANGLE OF THE CELL, A SECONDARY PHOTOELECTRIC CELL OF RELATIVELY SMALL AREA COMPARED TO THE PRIMARY PHOTOELECTRIC CELL AND ELECTRICALLY OPPOSING THE PRIMARY CELL TO REDUCE THE EFFECT OF SAID PRIMARY CELL ON THE CONTROL MEANS, SAID SECONDARY PHOTOELECTRIC CELL BEING DIRECTED IN SUBSTANTIALLY THE SAME DIRECTION AS THAT OF THE PRIMARY PHOTOELECTRIC CELL AND HAVING AN ACCEPTANCE ANGLE MUCH GREATER THAN THAT OF THE PRIMARY CELL SO THAT THE SECONDARY CELL RECEIVES A MUCH GREATER AMOUNT OF DIRECT SUNLIGHT OR OTHER ILLUMINANT THAN THAT RECEIVED BY THE PRIMARY PHOTOELECTRIC CELL AND ACCORDINGLY HAS A RELATIVELY GREAT EFFECT IN REDUCING THE EFFECT OF THE PRIMARY CELL ON THE CONTROL MEANS WHEN THE CAMERA IS DIRECTED IN THE QUADRANT OF THE SUN OR OTHER ILLUMINANT SO AS TO RECEIVE BACKLIGHTING ON THE SECONDARY CELL BUT NOT ON THE PRIMARY CELL, SAID SECONDARY CELL HAVING AN EFFECT ON THE CONTROL MEANS APPROACHING ZERO DUE TO ITS SMALL AREA RELATIVE TO THE PRIMARY CELL WHEN THE CAMERA IS DIRECTED SO THAT THE MAIN SOURCE OF LIGHT IS WITHIN THE FIELD OF THE ACCEPTANCE ANGLE OF THE PRIMARY CELL.