Method for manufacturing cathode ray tube screen

Claim 1

A METHOD FOR PRODUCING THE PHOSPHOR SCREEN OF A CATHODE RAY TUBE COMPRISING THE STEPS OF COATING THE SURFACE OF A FACE PLATE WITH A LIGHT SENSITIVE LAYER CONTAINING PHOSHOR MATERIAL, EXPOSING SAID LAYER TO LIGHT PASSING THROUGH APERTURES OF A MASK FROM A LIGHT SOURCE WHICCH, IN THE COURSE OF SAID EXPOSING OF SAID LAYER TO THE LIGHT THEREFROM, IS DISPOES AT LEAST TWO POSITIONS RELATIVE TO SAID FACE PLATE, WHICH TWO POSITIONS LIE ON, AND ARE SPACED FROM EACH OTHER ALONG A LINE PARALLELEL TO A LINE PERPENDICULAR TO SAID FACE PLATE AT THE CENTER OF THE LATTER SO THAT THE AREAS OF SAID LAYER EXPOSED TO LIGHT FROM SAID SOURCE THROUGH APERTURES OF SAID MASK ADJACENT THE PERIPHERY OF THE LATTER WILL BE LARGER RELATIVE TO THE PROSPECTIVE APERTURES THAN ARE THE AREAS OF SAID LAYER ECXOSED TO LIGHT FROM SAID SOURCE THROUGH APERTURES OF SAID MASK ADJACENT SAID CENTER OF THE LATTER, AND DEVEPOING DAIS LIGHT SENSITIVE LAYER SO THAT SIAD PHOSPHOR ,ATERIAL WILL REMAIN ONLY ON SELECTED AREAS OF SAID SURFACE CORRESPONDING TO SAID AREAS OF SAID LAYER EXPOSED TO LIGHT THROUGH SAID APERTURES.

Claim 2

A METHOD FOR PRODUCING THE PHOSPHOR SCREEN OF A CATHODE RAY TUBE COMPRISING THE STEPS OF COATING THE SURFACE OF A FACE PLATE WITH A LIGHT SENSITIVE LAYER CONTAINING PHOSHOR MATERIAL, EXPOSING SAID LAYER TO LIGHT PASSING THROUGH APERTURES OF A MASK FROM A LIGHT SOURCE WHICCH, IN THE COURSE OF SAID EXPOSING OF SAID LAYER TO THE LIGHT THEREFROM, IS DISPOES AT LEAST TWO POSITIONS RELATIVE TO SAID FACE PLATE, WHICH TWO POSITIONS LIE ON, AND ARE SPACED FROM EACH OTHER ALONG A LINE PARALLELEL TO A LINE PERPENDICULAR TO SAID FACE PLATE AT THE CENTER OF THE LATTER SO THAT THE AREAS OF SAID LAYER EXPOSED TO LIGHT FROM SAID SOURCE THROUGH APERTURES OF SAID MASK ADJACENT THE PERIPHERY OF THE LATTER WILL BE LARGER RELATIVE TO THE PROSPECTIVE APERTURES THAN ARE THE AREAS OF SAID LAYER ECXOSED TO LIGHT FROM SAID SOURCE THROUGH APERTURES OF SAID MASK ADJACENT SAID CENTER OF THE LATTER, AND DEVEPOING DAIS LIGHT SENSITIVE LAYER SO THAT SIAD PHOSPHOR ,ATERIAL WILL REMAIN ONLY ON SELECTED AREAS OF SAID SURFACE CORRESPONDING TO SAID AREAS OF SAID LAYER EXPOSED TO LIGHT THROUGH SAID APERTURES.

Claim 9

A method of producing the phosphor screen of a color picture tube comprising the steps of coating the surface of a faceplate with a first light sensitive layer containing phosphor material whiCh is cathodoluminescent to have emissions of a predetermined color, positioning a mask adjacent said surface of the faceplate with said mask having elongated apertures which are parallel to each other and with the widths of said apertures being at a maximum adjacent the center of the mask and decreasing progressively toward the edges of said mask in the direction transverse to the longitudinal axes of the apertures, exposing said layer to light passing through said apertures from an elongated light source extending parallel to said longitudinal axes of the apertures, in the course of said exposing of the layer to the light from said source, disposing said source at least at two positions relative to said face plate which two positions lie on, and are spaced from each other along a line parallel to a line perpendicular to said face plate at the center thereof so that the elongated areas of said layer exposed to light from said source through said apertures adjacent the edges of the mask have greater widths relative to the respective apertures than the elongated areas of said layer exposed to light from said source through the apertures adjacent said center of the mask, and developing said light sensitive layer so that said phosphor material remains permanently on first stripe-like areas of said surface corresponding to said elongated areas of said layer exposed to light through said elongated apertures; and repeating said steps at least once with a second light sensitive layer containing phosphor material which is cathodoluminescent to have emissions of another color, and with said at least two positions of the light source relative to the face plate for the exposing of said second layer to light therefrom being displaced, in said direction transverse to the longitudinal axes of the mask apertures, from said at least two positions of the light source for exposing said first layer so that, upon the developing of said second layer, the respective phosphor material remains permanently on second stripe-like areas of said surface which are in side-by-side relation to said first stripe-like areas.

Claim 10

A method of producing the phosphor screen of a color picture tube comprising the steps of coating the surface of a faceplate with a first light sensitive layer containing phosphor material whiCh is cathodoluminescent to have emissions of a predetermined color, positioning a mask adjacent said surface of the faceplate with said mask having elongated apertures which are parallel to each other and with the widths of said apertures being at a maximum adjacent the center of the mask and decreasing progressively toward the edges of said mask in the direction transverse to the longitudinal axes of the apertures, exposing said layer to light passing through said apertures from an elongated light source extending parallel to said longitudinal axes of the apertures, in the course of said exposing of the layer to the light from said source, disposing said source at least at two positions relative to said face plate which two positions lie on, and are spaced from each other along a line parallel to a line perpendicular to said face plate at the center thereof so that the elongated areas of said layer exposed to light from said source through said apertures adjacent the edges of the mask have greater widths relative to the respective apertures than the elongated areas of said layer exposed to light from said source through the apertures adjacent said center of the mask, and developing said light sensitive layer so that said phosphor material remains permanently on first stripe-like areas of said surface corresponding to said elongated areas of said layer exposed to light through said elongated apertures; and repeating said steps at least once with a second light sensitive layer containing phosphor material which is cathodoluminescent to have emissions of another color, and with said at least two positions of the light source relative to the face plate for the exposing of said second layer to light therefrom being displaced, in said direction transverse to the longitudinal axes of the mask apertures, from said at least two positions of the light source for exposing said first layer so that, upon the developing of said second layer, the respective phosphor material remains permanently on second stripe-like areas of said surface which are in side-by-side relation to said first stripe-like areas.