Color television deflection yoke having reduced variation in beam trio distortion
阅读：905发布：2021-02-23
专利汇可以提供Color television deflection yoke having reduced variation in beam trio distortion专利检索，专利查询，专利分析的服务。并且A deflection yoke for a color television receiver utilizing a delta gun shadow mask color picture tube has its winding distribution selected for minimizing the variations of the beam trio distortion around the picture tube display face for permitting use of a shadow mask yielding a greater and more uniform brightness over the viewed area of the tube.，下面是Color television deflection yoke having reduced variation in beam trio distortion专利的具体信息内容。
1. A yoke for deflecting the beams of a delta gun shadow mask color kinescope with minimum beam landing pattern distortion variation as measured at points on the raster around the edges of a generally rectangular scanned area of the kinescope, comprising: a yoke including vertical and horizontal deflection coil winding portions adapted to be energized by suitable currents for deflecting said beams vertically and horizontally, the conductor distribution of said coil winding portions being selected for producing a magnetic deflection field for effecting deflection of said beams such that there is substantially zero yoke-induced beam trio distortion in the corners of said scanned area, the conductor distribution being further selected for producing said field for effecting deflection of said beams in all portions around the edge region of said scanned area except in said corner regions such that there is substantially equal beam trio distortion ratios observed around the entire edge region of said raster.
2. A toroidal deflection yoke for a delta gun shadow mask color kinescope, comprising: a generally cylindrical core having a portion thereof flared to conform substantially with a flared portion of said kinescope; and conductors wound in toroidal fashion on said core for forming vertical and horizontal coil portions which when suitably energized by scanning current deflect the three beams of said kinescope in vertical and horizontal directions for forming a scanned raster on the display face of said kinescope, the distribution of conductors in said coil portions being selected for producing a magnetic deflection field which produces some isotropic astigmatism but substantially no anisotropic astigmatism such that the beam landing pattern observed in the corners of said display face of said kinescope, exhibits no yoke induced beam trio distortion, said distribution being further selected for balancing and isotropic astigmatism between said vertical and horizontal coil portions while maintaining said anisotropic astigmatism at substantially zero for substantially equalizing the beam trio distortion ratio of the beam landing pattern observed around the edge region of said scanned raster.
3. A toroidal deflection yoke for deflecting an electron beam trio in a delta gun shadow mask color kinescope, comprising: a generally cylindrical flared core member substantially conforming to a portion of the outside contour of said kinescope; and horizontal and vertical coil winding portions toroidally wound around said core for producing when energized by suitable scanning currents a magnetic field for deflecting said beam trio emitted from said delta gun as three beams respectively located at the apices of an equilateral triangle horizontally and vertically over the display face of said kinesCope for forming a raster thereon; said coil winding portions being selected for producing said deflection field which imparts some isotropic astigmatism and substantially no anisotropic astigmatism to said beam trio such that no yoke-induced beam trio distortion is observed in the corners of said raster, said coil winding portions being further selected for producing said deflection field for substantially equalizing the beam trio distortion ratios observed in the edge region of said raster for minimizing the light output variations at different portions of the scanned portion of said kinescope display face.
4. In a color television receiver, including the combination of a beam deflection system, a beam convergence system and a delta gun shadow mask kinescope including an electron gun structure for emitting electron beams from each of three electron guns disposed at the apices of an equilateral triangle, a display screen comprising trios of red, green and blue phosphor dots, and an aperture mask in registry with said display screen for permitting said three electron beams to pass therethrough to land on respective ones of said phosphor dots, and wherein beam trio distortion ratios of the beam landing pattern observed on the generally rectangular raster scanned by said beams on said display face are caused by a combination of beam crowding due to aperture mask and phosphor dot placement and degrouping due to the convergence and deflection component, a toroidal deflection yoke comprising: a toroidal yoke core; conductors wound around said core for forming vertical and horizontal coil winding portions disposed around said kinescope between said electron gun assembly and said aperture mask for deflecting said beams horizontally and vertically to scan said raster on said display screen, the distribution of conductors comprising said vertical and horizontal coil winding portions being selected for effecting deflection of said beams in the corners of said raster with substantially no yoke-induced beam trio distortion ratio component, said conductor distribution being further selected for effecting deflection of said beams in all portions around the edge region of said raster except said corners with substantially equal beam trio distortion ratios such that the beam trio landing pattern observed around the edge portion of said raster including said corners exhibits substantially equal beam trio distortion ratios resulting in substantially equal light output around the entire edge region of said raster.
5. A toroidal deflection yoke for use with a shadow mask color television picture tube in which three electron beams are emitted from an electron gun structure including three electron guns disposed in an equilateral triangular pattern, comprising: a ferrite core; conductors toroidally wound around said core for forming horizontal and vertical coil winding portions for deflecting said electron beams to scan a raster on the display face of said picture tube when suitably energized by canning currents, the conductor distribution of said coils being selected for producing isotropic astigmatism such that on-axis dynamic convergence correction is required for converging said beams in vertical and horizontal directions; the conductor distribution being further selected for producing substantially no anisotropic astigmatism such that no dynamic corner convergence correction is required for converging said beams in the corners of said raster, and the conductor distribution being further selected for apportioning said isotropic astigmatism between said vertical and horizontal coil winding portions for producing substantially no variation in beam trio landing pattern distortion ratios around the edge region of said raster.
6. A yoke for deflecting the beams of a delta gun shadow mask color kinescope with minimum beam landing pattern distortion variation as measured at points on the raster around the edges of a generally rectangular scaNned area of the kinescope, comprising: a yoke including vertical and horizontal deflection coil winding portions adapted to be energized by suitable currents for deflecting said beams vertically and horizontally, the conductor distribution of said coil winding portions being selected for producing a magnetic deflection field for effecting deflection of said beams such that there is some yoke-induced beam trio distortion in the corners of said scanned area and some yoke-induced beam trio distortion at other points in said scanned raster, the conductor distribution being further selected for effecting deflection of said beams such that there is substantially equal beam trio distortion ratio observed around the edge region of said scanned area.
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