Color picture tube with means for affecting magnetic deflection fields in electron gun area

In a color picture tube having an inline electron gun for generating and directing three electron beams comprising a center beam and two outer beams toward a screen of said tube, said tube including a deflection zone through which said electron beams pass, said deflection zone including means for deflecting said beams into essentially rectangular rasters on the screen, wherein without correction the deflecting means causes the center beam raster to have less vertical height but greater horizontal width than have the rasters of the two outer beams, the improvement comprising,

• first means on said gun within the deflection zone for reducing the vertical and horizontal dimensions of the outer beam rasters, said first means tending to distort the vertical dimension of the center beam raster, and
• second means for decreasing the horizontal dimension of the center beam raster more than said first means reduces the horizontal dimension of the outer beam rasters, said second means correcting for the tendency of said first means to distort the vertical dimension of the center beam raster, whereby the net effect on the vertical dimension of the center beam raster caused by the combination of the first and second means is negligible.

In a color picture tube including an evacuated envelope comprising a faceplate and a neck connected by a funnel, a mosaic color phosphor screen on the inner surface of said faceplate, a multiapertured color selection electrode spaced from said screen, an inline electron gun mounted in said neck for generating and directing three electron beams comprising a center beam and two outer beams along coplanar paths to said screen, and a deflection zone, located in the vicinity of the junction between said neck and said funnel, wherein said beams are subjected to vertical and horizontal magnetic deflection fields during operation of said tube for scanning said beams horizontally and vertically over said screen, the improvement comprising,

• means for decreasing the effect of the horizontal magnetic deflection field on said three electron beams, for decreasing the effect of the vertical magnetic deflection field on the two outer beams and for maintaining the effect of the vertical magnetic deflection field on said center beam.