Light measuring apparatus

Claim 1

A LIGHT MEASURING APPARATUS COMPRISING A LIGHT SOURCE, AN OPTICAL SYSTEM WHICH CONSISTS OF AT LEAST ONE LENS AND INCLUDING A DEFINED PLANE OF UNIFORM LUMINOUS FLUX DISTRIBUTION ILLUMINATING A SLIT BY THE LIGHT EMITTED FROM SAID LIGHT SOURCE, A ROTATING SECTOR MIRROR TO DIRECT A LIGHT BEAM WHICH HAS PASSED THROUGH SAID SLIT ALTERNATELY TO A REFERENCE LIGHT PATH AND TO A SAMPLE LIGHT PATH ARRANGED ALONG SIDE SAID REFERENCE LIGHT PATH, A PHOTOMETRIC COMB DISPOSED IN SAID REFERENCE LIGHT PATH AND MOVABLE AT RIGHT ANGLES THERETO; A FIRST LENS SYSTEM LOCATED IN FRONT OF SAID COMB AND INCLUDING A SPHERICAL LENS AND A CYLINDRICAL LENS, SAID SPHERICAL LENS BEING ARRANGED TO FORM A LINE IMAGE OF SAID DEFINED PLANE ON SAID PHOTOMETRIC COMB, SAID CYLINDRICAL LENS BEING ARRANGED IN COMBINATION WITH SAID SPHERICAL LENS TO FOCUS THE IMAGE OF SAID SLIT ON SAID PHOTOMETRIC COMB ALONG A DIRECTION OF MOVEMENT OF SAID PHOTOMETRIC COMB SO THAT THE CROSS SECTION OF SAID REFERENCE LIGHT PATH ON SAID PHOTOMETRIC COMB HAS A THIN RECTILINEAR SHAPE WITH UNIFORM DISTRIBUTION OF LUMINOUS FLUX INDEPENDENT OF NON-UNIFORMITY OF ILLUMINATION OF SAID SLIT; A SECOND LENS SYSTEM LOCATED BEHIND SAID COMB AND INCLUDING A CYLINDRICAL LENS WHICH PASSES THE LIGHT RECEIVED FROM SAID COMB CONVERTED INTO PARALLEL RAYS, AND SPHERICAL LENS MEANS TO CONCENTRATE THE IMAGE RECEIVED FROM SAID CYLINDRICAL LENS ON A REFERENCE SPACE,