Photosensitive automatic headlight control system

Claim 1

IN A VEHICLE HEADLIGHTING SYSTEM ADAPTED TO BE INSTALLED IN A VEHICLE, A DIRECTION FINDER FOR SENSING THE APPROACH AND MEASURING THE RELATIVE BEARING OF A LIGHT SOURCE CARRIED BY AN ONCOMING VEHICLE COMPRISING IN COMBINATION: A SOLAR CELL LOCATED IN THE FIRST MENTIONED VEHICLE, A VANE DISPOSED BETWEEN SAID CELL AND SAID SOURCE AND ADAPTED TO BE POSITIONED IN AZIMUTH IN ACCORDANCE WITH SAID BEARING BY CONTROLLING ADMISSION OF LIGHT TO SAID CELL, ELECTROMECHANICAL MEANS FOR CONTINUOUSLY POSITIONING SAID VANE, ELECTRONIC CIRCUIT MEANS INTERCOUPLING SAID SOLAR CELL AND SAID ELECTROMECHANICAL MEANS FOR CONDITIONING THE OUTPUT OF SAID CELL TO DRIVE SAID ELECTROMECHANICAL MEANS DISCRIMINATOR MEANS DISPOSED BETWEEN SAID VANE AND SAID CELL PERIODICALLY INTERRUPTING THE PASSAGE OF LIGHT FROM SAID SOURCE TO SAID SOLAR CELL SO THAT THE OUTPUT SIGNALS OF SAID CELL ARE PULSATING CURRENTS, THE ELECTRONIC CIRCUIT MEANS COMPRISING A PLURALITY OF TRANSISTOR STAGES FOR AMPLIFYING SAID PULSATING CURRENTS, A RECTIFIER FOR CHANGING THE OUTPUT OF SAID STAGES TO DIRECT CURRENTS, AND TRANSISTOR DRIVING MEANS COUPLED TO SAID RECTIFIER FOR RESPONDING TO SAID DIRECT CURRENTS TO DRIVE SAID ELECTROMECHANICAL MEANS.