Light regulator for telescopes and photographic or cinematographic lenses

Claim 1

A LIGHT REGULATOR FOR OPTICAL APPARATUS COMPRISING A BODY AND A LENS SYSTEM SUCH AS AN ASTRONOMIC TELESCOPE, A PHOTOGRAPHIC AND A CENEMATOGRAPHIC CAMERA, ADAPTED TO BE INTERPOSED BETWEEN THE BODY OF THE APPARATUS AND THE LENS SYSTEM, WHICH COMPRISES A ROTARY DISC, CONSISTING OF A PARALLEL FACED MIRRORR COATED WITH A VIGNETTED FILTERING LAYER TO HAVE A GRADUALLY INCREASING OPACITY FROM SAID END TO THE OPPOSITE END, SAID ROTARY DISC BEING SET WITH A 45* INCLINATION ACROSS THE LIGHT BEAM ISSUING FROM THE LENS SYSTEM AND HAVING A PARTIALLY REFLECTING BACK FACE TRANSMITTING LATERALLY ONE FRACTION OF SAID LIGHT BEAM ISSUING FROM THE LENS SYSTEM, A PHOTOCEL RECEIVING AN IMAGE FORMED BY SAID FRACTION OF SAID LIGHT BEAM ISSUING FROM THE LENS SYSTEM AND SIMILAR TO THAT FORMED BY THE LENS SYSTEM INSIDE THE APPARATUS, AN ELECTRICAL CIRCUIT COMPRISING ATL EAST ONE SOURCE OF DIRECT CURRENT, THE PHOTOELECTRIC CELL BEING SO MOUNTED IN SAID CIRCUIT AS TO DELIVER A MODULATED VOLTAGE OF A VALUE RESPONSIVE, TO THE CANDLEPOWER OF THE IMAGE FORMED ON SAID CELL, A MICROMOTOR MOUNTED IN SAID CIRCUIT FOR CONTROLLING THE POSITION OF SAID ROTARY DISC AND A MICRO-RELAY MOUNTED IN SAID CIRCUIT AND ADAPTED TO CO-OPERATE WITH SAID PHOTOELECTRIC CELL FOR CONTROLING THE ENERGIZATION OF SAID MOTOR, SAID MICRO-RELAY BEING SO ADJUSTED AS TO MAINTAIN THE ILLUMINATION OF SAID IMAGE AT A REFERENCE VALUE CORRESPONDING TO A REFERENCE VALUE OF SAID MODULATED VOLTAGE, SAID MICRO-RELAY BEING ADAPTED TO ENERGIZE SAID MOTOR WITH A DIRECT CURRENT SO DIRECTED AS TO INCREASE THE INTENSITY OF THE LIGHT BEAM TRANSMITTED THROUGH SAID ROTARY DISC WHEN SAID MODULATED VOLTAGE EMITTED FROM SAID CELL IS INFERIOR TO SAID REFERENCE VALUE, AND TO DECREASE THE INTENSITY OF THE LIGHT BEAM TRANSMITTED THROUGH SAID ROTARY DISC WHEN SAID MODULATED VOLTAGE EMITTED FROM SAID CELL IS SUPERIOR TO SAID REFERENCE VALUE.