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US 5,121,028 AGranted
Deflection winding with spaces or tabs intermediate its front and rear ends
AssigneeVideocolor
InventorMarc Milili
Life of this patent
Estimating the term…
Abstract
A self converging deflection yoke includes saddle coils having tabs mounted on or, alternatively, spaces formed in the windings. The tabs or spaces are located intermediate a gun end and a screen end of the deflection yoke. The tabs or spaces correct misconvergence at, the 2:30, 4:30, 8:30 and 10:30 hour points of a crosshatch pattern.
Claims14
A video display apparatus, comprising:
- a color cathode ray tube including an evacuated glass envelope and an array of color phosphor elements disposed at one end of said envelope forming a display screen and an electron gun assembly disposed at a second end of said envelope and generating a plurality of electron beams;
- a first deflection coil for producing a first deflection magnetic field that causes said electron beams to scan along a first axis of a raster on said display screen, said coil including a plurality of winding turns having a harmonic winding distribution that corrects for a first amount of electron beam landing error and a complete loop having corner sections that forms a winding window in said coil, said plurality including a first winding portion having conductor segments exclusive of conductor segments that form said corner sections and that delineate a winding space positioned away therefrom, said winding space modifying the harmonic winding distribution of said plurality of winding turns to correct for an electron beam landing misconvergence error at a half hour point of said raster;
- a second deflection coil for producing a second deflection magnetic field that causes said electron beam to scan said raster along a second axis of said display screen;
- and
- a magnetically permeable core for cooperating with said first and second deflection coils to form a deflection yoke.
2 more elements
A self converged color display system, comprising:
- a cathode ray tube comprising an evacuated glass envelope and including an array of different color representative phosphor elements disposed at one end of said envelope forming a display screen and an electron gun assembly disposed at a second end of said envelope, said electron gun assembly arranged to produce three horizontal in-line electron beams for energizing respective ones of said different color phosphor elements;
- a magnetically permeable core;
- horizontal and vertical deflection coils disposed in operating relationship relative to said core for producing when energized horizontal and vertical deflection fields for causing said beams to scan a raster on said display screen, the horizontal deflection field having a predominately pincushion-shaped field for establishing beam convergence along a horizontal axis at a vertical center of said display screen;
- and
- means for modifying the harmonic composition of said horizontal deflection field to cause said horizontal deflection field to exhibit a fifth harmonic component that has a significant positive value for correcting a misconvergence error at a half hour point of said raster.
2 more elements
A video display apparatus, comprising:
- a color cathode ray tube including an evacuated glass envelope and an array of color phosphor elements disposed at a first end of said envelope forming a display screen and an electron gun assembly disposed at a second end of said envelope and generating a plurality of electron beams;
- a first saddle-shaped coil including a plurality of winding turns for producing a first deflection magnetic field that causes said electron beams to scan along a first axis of said display screen, said winding turns including first and second end turns disposed at ends of said saddle-shaped coil that are adjacent said display screen and said electron gun assembly, respectively, and including winding corners that connect the two end turns to an intermediate turn portion to form a winding window in said coil having a perimeter defined by said end turns and said intermediate turn portion, said intermediate turn portion having formed therein a winding space that is not located in said winding corners to modify the harmonic winding distribution of said saddle-shaped coil for correcting a misconvergence error at a half hour point of said display screen;
- a second deflection coil for producing a second deflection magnetic field that causes said electron beams to scan along a second axis of said display screen;
- and
- a magnetically permeable core for cooperating with said first and second deflection coils to form a deflection yoke.
2 more elements
Dependencies are inferred from the claim text.