US 6,069,546 AGranted

Saddle shaped deflection winding having a winding space

AssigneeThomson Tubes & Displays, S.A.

InventorsNacerdine Azzi, Olivier Masson

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Abstract

A deflection yoke for a color cathode ray tube includes a saddle shaped vertical deflection coil and a saddle shaped horizontal deflection coil. The horizontal deflection coil includes winding turns forming a pair of side portions having a winding window therebetween extending free of conductor wires. The side portion has a winding space for correcting corresponding portions of coma and convergence errors. A corner portion of the winding space is disposed in a Z-axis coordinate selected in a range between a Z-axis coordinate, defining the end of the window that is close to the electron gun of the tube, and a third Z-axis coordinate, closer to the screen of the tube. The length of the range may be approximately 10% of a length of the window. Correction of convergence error, horizontal coma error or coma parabola error may be obtained without using field shapers such as shunts or magnets.

Claims15

Dependent claims

A video display deflection apparatus, comprising:

a saddle shaped, first deflection coil for producing a deflection field to scan an electron beam along a first axis of a display screen of a cathode ray tube, said first deflection coil including a plurality of winding turns forming a pair of side portions, a front end turn portion, close to said screen, and a rear end turn portion, close to an electron gun of said tube, said side portions forming a winding window free of conductor wires therebetween having a length dimension defined by a distance between said front end turn portion and said rear end turn portion, at least one of said side portions having a first winding space for correcting a beam landing error, said first winding space having a first corner portion at a location selected from a range of longitudinal coordinates between a longitudinal coordinate of a first end of said window, close to said rear end turn portion, and a longitudinal coordinate closer to said screen by a distance that is 10% of said length dimension of said window;
a second deflection coil for scanning said electron beam along a second axis of said screen to form a raster;
and
a magnetically permeable core for cooperating with said first and second deflection coils to form a deflection yoke.

1 more element

A video display deflection apparatus, comprising:

a saddle shaped, first deflection coil for producing a deflection field to scan an electron beam along a first axis of a display screen of a cathode ray tube, said first deflection coil including a plurality of winding turns forming a pair of side portions, a front end portion, close to said screen, and a rear end portion, close to an electron gun of said tube, said side portions forming a winding window free of conductor wires therebetween having a length dimension extending between said front end turn portion and said rear end turn portion, at least one of said side portions having a pair of first and second winding spaces having first and second corner portions, respectively, said corner portions being disposed between said front end turn portion and said rear end turn portion for affecting coma parabola error in opposite directions that compensate each other;
a second deflection coil for scanning said electron beam along a second axis of said screen to form a raster;
and
a magnetically permeable core for cooperating with said first and second deflection coils to form a deflection yoke.

1 more element

Dependencies are inferred from the claim text.