Electron beam and deflection yoke alignment for producing convergence of plural in-line beams

Claim 1

A method of mounting a beam deflection yoke relative to a color picture tube comprising an envelope containing a color phosphor screen, an electron gun assembly for projecting a plurality of electron beams toward said screen and a deflection region for said beams, said method comprising: supporting said tube in a predetermined position; temporarily supporting said deflection yoke loosely assembled around said picture tube adjacent said deflection region; operating said tube and yoke to project said beams toward said screen and to scan said beams in separate rasters on said screen, and simultaneously adjusting the transverse position of said yoke relative to said picture tube while maintaining substantial parallelism of the longitudinal axes of said yoke and picture tube to achieve substantial convergence of said beams and coincidence of said rasters on said screen; and fixedly attaching said yoke to said picture tube in said adjusted position.

Claim 2

A method of mounting a beam deflection yoke relative to a color picture tube comprising an envelope containing a color phosphor screen, an electron gun assembly for projecting a plurality of electron beams toward said screen and a deflection region for said beams, said method comprising: supporting said tube in a predetermined position; temporarily supporting said deflection yoke loosely assembled around said picture tube adjacent said deflection region; operating said tube and yoke to project said beams toward said screen and to scan said beams in separate rasters on said screen, and simultaneously adjusting the transverse position of said yoke relative to said picture tube while maintaining substantial parallelism of the longitudinal axes of said yoke and picture tube to achieve substantial convergence of said beams and coincidence of said rasters on said screen; and fixedly attaching said yoke to said picture tube in said adjusted position.

Claim 8

A system for converging a plurality of beams in a color television display system, comprising: a color picture tube comprising an envelope containing a color phosphor element screen at one end thereof and an electron gun assembly for producing three horizontal coplanar in-line beams disposed within a neck portion of said envelope remote from said screen; a deflection yoke having the conductor winding distribution of horizontal and vertical deflection coils thereof selected for producing negative horizontal isotropic astigmatism and positive vertical isotropic astigmatism, said coils being spaced circumferentially around a core and forming a smallest inside diameter of said yoke larger than the outside diameter of said neck portion of said tube envelope; and means for mounting said yoke around said picture tube and including means for allowing movement of said entire yoke in directions substantially normal to the central longitudinal axis of said picture tube and for fixedly retaining said yoke in a position providing substantial convergence of said beams.

Claim 9

A system for converging a plurality of beams in a color television display system, comprising: a color picture tube comprising an envelope containing a color phosphor element screen at one end thereof and an electron gun assembly for producing three horizontal coplanar in-line beams disposed within a neck portion of said envelope remote from said screen; a deflection yoke having the conductor winding distribution of horizontal and vertical deflection coils thereof selected for producing negative horizontal isotropic astigmatism and positive vertical isotropic astigmatism, said coils being spaced circumferentially around a core and forming a smallest inside diameter of said yoke larger than the outside diameter of said neck portion of said tube envelope; and means for mounting said yoke around said picture tube and including means for allowing movement of said entire yoke in directions substantially normal to the central longitudinal axis of said picture tube and for fixedly retaining said yoke in a position providing substantial convergence of said beams.