Art of making color-phosphor mosaic screens

Claim 1

IN THE ART OF MANUFACTURING A CATHODE-RAY TUBE OF THE KIND THAT (I) CONTAINS A PHOSPHOR SCREEN OF THE MOSAIC VARIETY AND (II) UTILIZES AN ELECTRON-BEAM WHOSE EFFECTIVE CENTER OF DEFLECTION IS A FUNCTION OF DEFLECTION ANGLE; THE METHOD OF PLOTTING UPON THE SCREEN-PLATE OF SAID TUBE THE DESIRED RELATIVE LOCATION OF THE ELEMENTAL AREAS OF WHICH SAID PHOSPHOR MOSAIC IS TO CONSIST, AND METHOD COMPRISING: (A) PHOTOSENSITIZING SAIS SCREEN-PLATE, (B) PROJECTING LIGHT-RAYS TOWARD SAID PHOTOSENSITIZED SCREEN-PLATE FROM A POINT CORRESPONDING TO THE EFFECTIVE CENTER OF DEFLECTION OF SAID ELECTRON-BEAM AT AT PARTICULAR DEFLECTION ANGLE, (C) CONVERTING SAID LIGHT RAYS INTO A PLURALITY OF SPACED APART CONCENTRIC ZONES OF LIGHT WHEREIN THE SEPARATE LIGHT ZONES AND THE SPACES THEREBETWEEN CORRESPOND, RESPECTIVELY, TO ALTERNATE AND INTERMEDIATE ANNULAR AREAS OF SAID SCREEN-PLATE, (D) OPTICALLY CONTROLLING THE PATHS OF THE RAYS OF WHICH SAID SEPARATE LIGHT ZONES CONSIST TO CAUSE SAID RAYS TO APPROACH SAID ALTERNATE ANNULAR AREAS OF SAID PHOTOSENSITIZED SCREEN-PLATE ALONG PATHS CORRESPONDING SUBSTANTIALLY TO THE PATHS TRAVERSED BY SAID ELECTRONBEAM IN PASSING FROM SAID EFFECTIVE CENTER OF DEFLECTION TO SAID ALTERNATE ANNULAR AREAS OF SAID SCREENPLATE ALONG ALL OF THE VARIOUS DEFLECTION ANGLES OF SAID CATHODE-RAY TUBE, (E) IMPRESSING CORRESPONDING ALTERNATE ANNULAR PORTIONS OF THE DESIRED PATTERN OF SAID MOSAIC UPON SAID LIGHT RINGS WHEREBY PHOTOGRAPHICALLY TO RECORD SAID ALTERNATE ANNULAR PORTIONS OF SAID MOSAIC PATTERN UPON SAID ALTERNATE ANNULAR AREAS OF SAID PHOTOSENSITIZED SCREEN-PLATE, (F) THEN CONVERTING THE LIGHT RAYS FROM SAID POINT INTO A PLURALITY OF SPACED APART CONCENTRIC ZONES OF LIGHT WHEREIN THE SEPARATE LIGHT ZONES AND THE SPACES THEREBETWEEN CORRESPOND, RESPECTIVELY, TO SAID INTERMEDIATE AND SAID ALTERNATE ANNULAR AREAS OF SAID SCREENPLATE,