Polarization type anti-dazzle device for motor vehicles

Claim 1

AN ANTI-DAZZLE DEVICE FOR MOTOR VEHICLES INCLUDING A WINDSHIELD, A VISOR AND A REAR VIEW MIRROR, CONSTITUTING FIRST ELEMENTS AND GOGGLES, ADAPTED TO BE WORN BY THE DRIVER, CONSTITUTING A SECOND ELEMENT, COMPRISING A FIRST POLARIZATION FILTER DISPOSED ON ONE OF SAID FIRST ELEMENTS AND SERVING AS A POLARIZER TO POLARIZE THE LIGHT PASSING THERETHROUGH IN ONE DIRECTION OF OSCILLATION, A SECOND POLARIZATION FILTER DISPOSED ON SAID SECOND ELEMENT AND SERVING AS AN ANALYSER FOR THE POLARIZED LIGHT INCIDENT ON SAID SECOND ELEMENT, SAID POLARIZATION FILTERS HAVING GREEN-YELLOW COLARS SUCH THAT WHEN THE DIRECTIONS OF POLARIZATION OF THE POLARIZER AND OF THE ANALYSER ARE THE SAME, THE WAVE LENGTHS OF THE LIGHT PASSED THROUGH THE EYES OF THE DRIVER LIE APPROXIMATELY BETWEEN 515 AND 600 MU, CORRESPONDING TO A RELATIVE SENSITIVITY OF MORE THAN APPROXIMATELY 85% OF THE MAXIMUM VALUE, AND WHEN THE DIRECTIONS OF POLARIZATION OF THE POLARIZER AND THE ANALYSER ARE AT RIGHT ANGLES TO EACH OTHER, THE WAVE LENGTHS OF THE LIGHT PASSED THROUGH THE EYES OF THE DRIVER LIE APPROXIMATELY BETWEEN 470 AND 480 MU CORRESPONDING TO A CONTRAST SENSITIVITY OF APPROXIMATELY 5 TO 10% OF THE MAXIMOUM VALUE, AND SAID GOGGLES COMPRISE A POLARIZING FILM EXTENDING OVER THE WHOLE OF SAID GOGGLES, AND A DOUBLY-REFRACTING COLORLESS FILM DISPOSED IN FRONT OF A PORTION OF THE POLARIZING FILM, SAID POLARIZING FILM BEING ADAPTED TO POLARIZE LIGHT IN A DIRECTION AT RIGHT ANGLES TO THE DIRECTION OF POLARIZATION OF SAID FIRST POLARIZATION FILTER, AND SAID DOUBLY-REFRACTING FOIL BEING DISPOSED WITH ITS OPTICAL AXIS INCLINED AT AN ANGLE OF 45* TO THE DIRECTION OF POLARIZATION OF THE POLARIZING FILM.