Self-converging color television display system

Claim 2

A color television display system, comprising: a color television picture tube including a face-plate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements, said electron beam gun assembly being selected for producing said three beams along three generally convergent lines extending toward the center of said viewing screen; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmatism such that said beams are overconverged at the ends of the vertical axis of the raster and underconverged at the ends of the horizontal axis thereof; said electron beam gun assembly including beam forming members for producing a spacing not greater than 0.200 inches between adjacent ones of said beams meaured in a plan located halfway between the ends of said yoke when said beams are substantially at the center of said screen.

Claim 3

A color television display system according to claim 1 wherein said electron gun assembly includes at least one common beam forming electrode having three apertures for said beams.

Claim 4

A color television display system according to claim 2 wherein said electron gun assembly includes shield members disposed around the path of the two outside ones of said three beams for shielding said two beams from a portion of said deflection field.

Claim 5

A color television display system according to claim 3 wherein said electron gun beam forming members produce a spacing between adjacent beams in said deflection plane of substantially 0.158 inches when said beams are substantially at the center of said viewing screen.

Claim 6

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon repeating groups of three different color phosphor elements, said elements being in the form of parallel strips forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and normal to the direction of said phosphor strips and, an aperture mask including a plurality of elongated slit apertures extending collinearly with said phosphor strips and in registry with said groups of phosphor elements, said electron beam gun assembly being selected for producing said three beams along three generally convergent lines extending toward the center of said viewing screen; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmatism for overconverging the beams at the ends of the vertical deflection axis and underconverging the beams at the ends of the horizontal deflection axis; said electron beam gun assembly including beam forming members for producing a spaced not greater than 0.200 inches between adjacent ones of said beams measured in a plane located halfway between the ends of said yoke when said beams are substantially at the center of said viewing screen.

Claim 7

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon repeating groups of three different color phosphor elements, said elements being in the form of parallel strips forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and normal to the direction of said phosphor strips and, an aperture mask including a plurality of elongated slit apertures extending collinearly with said phosphor strips and in registry with said groups of phosphor elements, said electron beam gun assembly being selected for producing said three beams along three generally convergent lines extending toward the center of said viewing screen; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmatism for overconverging the beams at the ends of the vertical deflection axis and underconverging the beams at the ends of the horizontal deflection axis; said electron beam gun assembly including beam forming members for producing a spaced not greater than 0.200 inches between adjacent ones of said beams measured in a plane located halfway between the ends of said yoke when said beams are substantially at the center of said viewing screen.

Claim 8

A color television display system according to claim 5 wherein said electron gun assembly includes at least one common beam forming electrode having three apertures for said beams.

Claim 9

A color television display system according to claim 6 wherein said electron gun assembly includes shield members disposed around the path of the two outside ones of said three beams for shielding said two beams from a portion of said deflection field.

Claim 10

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements, said electron gun assembly being selected for producing said three beams along three generally convergent lines extending toward the center of said viewing screen; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmatism for overconverging the beams at the ends of the vertical deflection axis and for underconverging the beams at the ends of the horizontal deflection axis; said electron beam gun assembly including at least one common beam forming electrode having three apertures therein and including beam forming members for producing a spacing not greater than 0.200 inches between adjacent ones of said beams measured in a plane halfway between the ends of said yoke when said beans are substantially at the center of said viewing screen such that said beams are substantially converged at all points on said raster.

Claim 11

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements, said electron gun assembly being selected for producing said three beams along three generally convergent lines extending toward the center of said viewing screen; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmatism for overconverging the beams at the ends of the vertical deflection axis and for underconverging the beams at the ends of the horizontal deflection axis; said electron beam gun assembly including at least one common beam forming electrode having three apertures therein and including beam forming members for producing a spacing not greater than 0.200 inches between adjacent ones of said beams measured in a plane halfway between the ends of said yoke when said beans are substantially at the center of said viewing screen such that said beams are substantially converged at all points on said raster.

Claim 12

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements, said electron beam gun assembly being selected for producing said three beams along three generally convergent lines extending toward said viewing screen; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmatism for overconverging the beams at the ends of the vertical deflection axis and for underconverging the beams at the ends of the horizontal deflection axis; said electron gun including beam forming members for producing a spacing between adjacent oneS of said beams not greater than 0.200 inches measured in a plane located halfway between the ends of said yoke when said beams are substantially at the center of said viewing screen; said electron gun further including shield members disposed around the outside two of said three beams for shielding said two beams from a portion of said deflection field such that all three of said beams scan substantially equal size rasters, and whereby all of said beams are substantially converged at all points on said raster.

Claim 13

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements, said electron beam gun assembly being selected for producing said three beams along three generally convergent lines extending toward said viewing screen; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmatism for overconverging the beams at the ends of the vertical deflection axis and for underconverging the beams at the ends of the horizontal deflection axis; said electron gun including beam forming members for producing a spacing between adjacent oneS of said beams not greater than 0.200 inches measured in a plane located halfway between the ends of said yoke when said beams are substantially at the center of said viewing screen; said electron gun further including shield members disposed around the outside two of said three beams for shielding said two beams from a portion of said deflection field such that all three of said beams scan substantially equal size rasters, and whereby all of said beams are substantially converged at all points on said raster.

Claim 14

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for apportioning the astigmatism produced by the coils such that said beams are overconverged at the ends of the vertical axis of the raster ans substantially converged at all points of the raster, said electron beam gun assembly including beam forming members for producing a spacing not greater than 0.200 inches between adjacent ones of said beams measured in a plane located halfway between the ends of said yoke when the beams are substantially at the center of said viewing screen.

Claim 15

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for apportioning the astigmatism produced by the coils such that said beams are overconverged at the ends of the vertical axis of the raster ans substantially converged at all points of the raster, said electron beam gun assembly including beam forming members for producing a spacing not greater than 0.200 inches between adjacent ones of said beams measured in a plane located halfway between the ends of said yoke when the beams are substantially at the center of said viewing screen.

Claim 16

A color television display system according to claim 10 wherein said electron gun assembly includes at least one common beam forming electrode having three apertures for said beams.

Claim 17

A color television display system according to claim 11 wherein said electron gun assembly includes shield members disposed around the path of the two outside ones of said three beams for shielding said two beams from a portion of said deflection field.

Claim 18

A color television display system according to claim 12 wherein said electron gun beam forming members produce a spacing between adjacent beams in said deflection plane of substantially 0.158 inches when said beams are substantially at the center of viewing screen.

Claim 19

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon repeating groups of three different color phosphor elements, said elements being in the form of parallel strips forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and normal to the direction of said phosphor strips and, an aperture mask including a plurality of elongated slit apertures extending collinearly with said phosphor strips and in registry with said groups of phosphor elements; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmatism such that said beams are substantially converged at all points on said viewing screen; said electron beam gun assembly including beam forming members for producing a spacing not greater than 0.200 inches between adjacent ones of said beams measured in a plane located halfway between the ends of said yoke when said beams are substantially at the center of said screen.

Claim 20

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon repeating groups of three different color phosphor elements, said elements being in the form of parallel strips forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and normal to the direction of said phosphor strips and, an aperture mask including a plurality of elongated slit apertures extending collinearly with said phosphor strips and in registry with said groups of phosphor elements; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmatism such that said beams are substantially converged at all points on said viewing screen; said electron beam gun assembly including beam forming members for producing a spacing not greater than 0.200 inches between adjacent ones of said beams measured in a plane located halfway between the ends of said yoke when said beams are substantially at the center of said screen.

Claim 21

A color television display system according to claim 14 wherein said winding distribution of said coils is selecTed such that said horizontal negative isotropic astigmatism and said vertical positive isotropic astigmatism produces underconvergence of said beams at the ends of the horizontal deflection axis and substantial convergence of said beams at all points of the raster.

Claim 22

A color television display system according to claim 15 wherein said electron gun assembly includes at least one common beam forming electrode having three apertures for said beams.

Claim 23

A color television display system according to claim 16 wherein said electron gun assembly includes shield members disposed around the path of the two outside ones of said three beams for shielding said two beams from a portion of said deflection field.

Claim 24

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmatism; said electron beam gun assembly including at least one common beam forming electrode having three apertures therein and including beam forming members for producing a spacing not greater than 0.200 inches between adjacent ones of said beams measured in a plane halfway between the ends of said yoke when said beams are substantially at the center of said viewing screen such that said beams are substantially converged at all points on said raster.

Claim 25

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmatism; said electron beam gun assembly including at least one common beam forming electrode having three apertures therein and including beam forming members for producing a spacing not greater than 0.200 inches between adjacent ones of said beams measured in a plane halfway between the ends of said yoke when said beams are substantially at the center of said viewing screen such that said beams are substantially converged at all points on said raster.

Claim 26

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmastism; said electron gun including beam forming members for producing a spacing between adjacent ones of said beams not greater than 0.200 inches measured in a plane located halfway between the ends of said yoke when said beams are converged at the center of said viewing screen; said electron gun further including shield members disposed around the outside two of said three beams for shielding said two beams from a portion of said deflection field such that all three of said beams scan substantially equal size rasters, and whereby all of said beams are substantially converged at all points on said raster.

Claim 27

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements; and a deflection yoke comprising vertical and horizontal deflection coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for producing vertical positive isotropic astigmatism and negative horizontal isotropic astigmastism; said electron gun including beam forming members for producing a spacing between adjacent ones of said beams not greater than 0.200 inches measured in a plane located halfway between the ends of said yoke when said beams are converged at the center of said viewing screen; said electron gun further including shield members disposed around the outside two of said three beams for shielding said two beams from a portion of said deflection field such that all three of said beams scan substantially equal size rasters, and whereby all of said beams are substantially converged at all points on said raster.

Claim 28

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements; and a deflection yoke comprising vertical and horizontal deflectioN coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for apportioning the astigmatism produced by the coils such that said beams are underconverged at the ends of the horizontal axis of the raster and substantially converged at all points of the raster, said electron beam gun assembly including beam forming members for producing a spacing not greater than 0.200 inches between adjacent ones of said beams measured in a plane located halfway between the ends of said yoke when the beams are substantially at the center of said viewing screen.

Claim 29

A color television display system, comprising: a color television picture tube including a faceplate having deposited thereon groups of three different color phosphor elements forming a viewing screen, an electron beam gun assembly for producing three horizontal in-line electron beams lying in a plane substantially normal to said viewing screen and an aperture mask including a plurality of apertures in registry with said groups of phosphor elements; and a deflection yoke comprising vertical and horizontal deflectioN coils disposed around said picture tube between said mask and said gun assembly for deflecting said beams for forming a raster on said viewing screen, the winding distribution of said deflection coils being selected for apportioning the astigmatism produced by the coils such that said beams are underconverged at the ends of the horizontal axis of the raster and substantially converged at all points of the raster, said electron beam gun assembly including beam forming members for producing a spacing not greater than 0.200 inches between adjacent ones of said beams measured in a plane located halfway between the ends of said yoke when the beams are substantially at the center of said viewing screen.