Convergence yoke
AssigneesSanyo Electric Co., Ltd., Sanyo Electronic Components Co., Ltd.
InventorMasahiko Miyazaki
Life of this patent
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Abstract
A convergence yoke embodying the present invention produces two-pole magnetic field for deflecting the electron beam in a horizontal direction or a vertical direction, and comprises a ring core 1 having a horizontal coil 2 and a vertical coil 3 wound therearound. With the horizontal coil 2 and the vertical coil 3, winding density distribution wherein winding angle θ from each of a horizontal coil reference axis 20 and a vertical coil reference axis 30 is a variable is in proportion to cos2 θ, whereby magnetic field strength distribution becomes more uniform than conventionally.
Claims4
A convergence yoke comprising a ring core having a plurality of coils wound therearound and producing two-pole magnetic field for deflecting an electron beam in a horizontal direction or in a vertical direction, wherein winding density distribution of each of the coils winding angle θ from a reference axis of the ring core is a is in proportion to cos2 θ.
A convergence yoke comprising a ring core having a plurality of coils wound therearound and producing two-pole magnetic field for deflecting an electron beam in a horizontal direction or in a vertical direction, each of the plurality of coils comprising a plurality of coil portions, each of the coil portions being wound uniformly at a first winding density X1 within a predetermined angle range (θs to θe) wherein a winding center is in the range of 25° to 30° in winding angle θ from a reference axis on each of quadrants of orthogonal coordinates and being wound uniformly at a second winding density X2 within an angle range (0 to θs) from 0° to the predetermined angle range in winding angle θ, ratio of the second winding density X2 relative to the first winding density X1 being represented by an expression given below.
- X2/X1=((cos2 θs−cos2 θe)/2 cos2 θs)±0.1.
Dependencies are inferred from the claim text.