JP2001155660A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke which removes miss-convergence. SOLUTION: Fig. 1 shows a separator of the deflection coil according to an embodiment of the present invention. In a circular shape separator 1 having a circular shape notch part 2 suitable to the cathode ray tube (not shown), a deflection coil of section winding is formed in that Y-Y is a middle axis dividing the separator 1 into right and left (or higher and lower) parts, the right and left parts are asymmetric by making the diameter of the separator 1 in one part small, and the wound part 4 between the rib 3, 3 is through the Litz wire. The Litz wire has different distance between inner diameter part of the deflection coil and funnel curve of the cathode ray tube since the line integrations of the strong twisted direction and the weak twisted direction is different from each other and can be a cause of the miss-convergence. Since the distances can be identical by using the asymmetric separator, the deflection yoke which is free from miss-convergence can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke, and more particularly, to a deflection yoke having a deflection coil in which a stranded wire (Litz wire) formed by bundling and twisting a plurality of conductive wires is section-wound.

[0002]

2. Description of the Related Art In a deflection coil used in a cathode ray tube display device requiring a high resolution, a plurality of small-diameter conductors are twisted to reduce eddy current loss of the deflection coil and loss due to a skin effect. It is widely known that a litz wire is used, and this is passed between partitions (ribs) of a separator to constitute a deflection coil. FIG.
FIG. 1 is a view of a separator normally used when forming a deflection coil, viewed from the funnel side (tube direction) of a cathode ray tube. In the figure, a separator 1 ′ is a panel having a substantially circular shape as a whole, At the center, there is a circular notch 2 for facilitating attachment of the deflection coil to the cathode ray tube, and furthermore, it projects at a predetermined height h on the near side of the drawing to separate the litz wire by a predetermined turn. Ribs 3 for winding,
3 ... has a winding part 4 configured therebetween. The rib 3 reaches the circular notch 2 via the winding portion 4 and terminates in the circular notch 2 while maintaining the height h.

FIG. 4 is a diagram schematically showing the winding direction of a deflection coil. A litz wire M is provided on the upper half of the separator 1 'shown in FIG. The wire passes through the winding portion 4 between the ribs 3 and 3 and returns to the rewinding side c via the other side b of the paper surface through the winding portion 4 between the ribs 3, and further d on the other side of the paper surface
And returns to the winding start side a. This is wound a predetermined number of times for each winding part 4, and the winding parts 4, 4,... Are sequentially filled to form a deflection coil, thereby generating a deflection magnetic field. Such a winding system is known as (single-axis type) section winding.
FIG. 5 is a view schematically showing a state in which the deflection coil is attached to the cathode ray tube. In the drawing, the deflection coil 6 is installed on the cathode ray tube 7 by ordinary attachment means (not shown). SS '
Indicates the central axis of the electron beam emitted from the electron gun,
d indicates the distance between the inner diameter side of the deflection coil 6 and the funnel curve of the cathode ray tube 7. Here, d 'is the distance between the inner diameter side of the deflection coil 6 and the central axis SS' of the electron beam.

As described above, in a section winding deflection coil using a litz wire, a left-right (or up-down) symmetric separator 1 'is used. In this case, since the twist of the litz wire is in a fixed direction, a direction in which the twist is strengthened and a direction in which the twist is weakened depending on the twist direction on the left and right (or up and down) of the winding. For this reason, the wire diameter increases in the direction in which the twist is strengthened as compared with the direction in which the twist is weakened, so that the wire product is increased. That is, in a deflection yoke having a section winding deflection coil using a litz wire, since the litz wire has a twisting direction, the winding is on the down side (winding from the funnel side of the cathode ray tube 7 to the neck side).
The winding state differs between the upstream side (winding from the neck side of the cathode ray tube 7 to the funnel side).

FIG. 6 is a partial cross-sectional view of the separator 1 'for showing a situation where the winding state of the deflection coil is different between the windings on the up side and the windings on the down side. In FIG. The distance d (FIG. 6A) between the inner diameter side of the deflection coil 6 and the funnel curve of the cathode ray tube 7 is d + α (FIG. 6B) in the direction of weakening the twist, and the upward winding of the deflection coil The distance between the inner diameter side of the deflection coil 6 and the funnel curve of the cathode ray tube 7 differs between the downstream winding and the downstream winding. Therefore, when using a symmetrical separator,
This was causing asymmetric misconvergence.

[0006]

Conventionally, in order to eliminate asymmetric misconvergence, techniques such as changing the distribution of correction circuits and deflection coils have been adopted. However, recently, the green color of the color cathode ray tube has been reduced. The problem of laterally asymmetric misconvergence has become a problem, and it has been difficult to eliminate such misconvergence with the above-described method.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the asymmetric misconvergence is reduced by keeping the distance between the inner diameter side of the deflection coil and the funnel curve of the cathode ray tube corresponding to the twist direction of the litz wire. A deflection yoke to be eliminated is provided.

[0008]

According to a first aspect of the present invention, there is provided a deflection yoke having a deflection coil in which a plurality of conductive wires are bundled and twisted in a section through a winding portion of a substantially circular winding means. By making the shape of the substantially circular winding means asymmetrical on both sides of the center axis, a change in the linear product of the stranded wire according to the winding direction of the deflection coil in the substantially circular winding means is absorbed. It is made possible.

According to a second aspect of the present invention, in the first aspect of the present invention, the shape of the winding means is such that the diameters of the winding portions are different from each other on both sides of the central axis.

According to a third aspect of the present invention, in the first aspect of the present invention, the shape of the winding means is such that a winding portion is thick on one side of the central axis.

[0011]

FIG. 1 is a schematic view of a deflection coil separator according to an embodiment of the present invention, as viewed from the funnel side (tube direction) of a cathode ray tube. A) An asymmetrical substantially circular separator. That is,
YY is a central axis orthogonal to the central axis SS ′ of the electron beam and dividing the separator into right and left (or up and down);
On both sides of the center axis, the diameter of the winding part 4 is made different from each other to form an asymmetric separator, and a litz wire is section-wound on this separator to obtain a required deflection coil. The same components as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

The litz wire has a large wire product between the ribs 3 and 3 in the direction in which the twisting is strengthened, so that the wire product becomes large, and reaches the top (height h) of the rib 3 when it is wound a predetermined number of times. On the other hand, in the direction of weakening the twist, the wire diameter becomes smaller and the wire product becomes smaller. Therefore, when the wire is wound the same number of times, the litz wire stays below the top (height h) between the ribs 3 and 3 as described above. By reducing the diameter of the winding portion 4 on one side of the center axis Y-Y of the separator 1, that is, the distance from the center axis of the electron beam, the winding position can be moved to be closer to the cathode ray tube 7 side. Therefore, the deflection coil 6 is provided on both the side where the twist of the litz wire is strengthened and the side where the twist is reduced.
Can be made equal to the distance d between the inner diameter side of the above and the funnel curve of the cathode ray tube 7.

FIG. 2 is a partial cross-sectional view of a separator of a deflection coil according to another embodiment of the present invention. When the twisting direction is weakened, the diameter of one side of the center axis YY of the separator 1 is reduced. In this case, instead of bringing the litz wire M closer to the cathode ray tube 7 side, a thick portion 5 is provided between the ribs 3 (FIG. 2).
(B)). Therefore, the litz wire M is lifted up to the top (height h) of the rib 3 and the distance d between the inner diameter side of the deflection coil 6 and the funnel curve of the cathode ray tube 7 is the same on both the side where the twist is strengthened and the side where the twist is weakened. Can be

In any of the above-mentioned methods, the space generated in the direction in which the twist is weakened can be filled, and the litz wire can be collected in a direction with a smaller diameter (a direction closer to the cathode ray tube). Since the deflecting magnetic field in the direction of smaller diameter becomes stronger, the left-right (up-down) magnetic field asymmetry is reduced, and the deflection efficiency is improved. Further, it is possible to obtain a cathode ray tube equipped with a deflection yoke composed of a deflection coil configured by the above method.

[0015]

According to the first aspect of the present invention, there is provided a deflection yoke having a deflection coil in which a plurality of conductive wires are bundled and twisted, and a stranded wire is section-wound through a winding portion of a substantially circular winding means. By making the shape of the circular winding means asymmetrical to each other on both sides of the center axis, it is possible to absorb a change in the linear product of the stranded wire according to the winding direction of the deflection coil in the substantially circular winding means. Therefore, the asymmetric misconvergence of the cathode ray tube can be eliminated.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the shape of the winding means can be easily changed because the diameters of the winding portions are different from each other on both sides of the central axis. The stranded wire can be brought closer to the cathode ray tube side so that the distance between the inner diameter side of the deflection coil and the funnel curve of the cathode ray tube becomes constant corresponding to the twisting direction of the stranded wire.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, the shape of the winding means is such that the thickness of the winding portion is increased on one side of the central axis, so that the shape is easy. The stranded wire can be brought closer to the cathode ray tube side so that the distance between the inner diameter side of the deflection coil and the funnel curve of the cathode ray tube becomes constant corresponding to the twisting direction of the stranded wire.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a separator according to one embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a separator according to another embodiment of the present invention.

FIG. 3 is a view of a commonly used separator viewed from a funnel side (tube direction) of a cathode ray tube.

FIG. 4 is a diagram schematically showing a winding direction of a deflection coil.

FIG. 5 is a view schematically showing an aspect in which a deflection yoke is attached to a cathode ray tube.

FIG. 6 is a partial cross-sectional view of a conventional separator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 '... Separator 2 ... Circular notch 3 ... Rib 4 ... Winding part 5 ... Thick part 6 ... Deflection coil 7 ... Cathode ray tube M ... Litz wire

Claims (3)

[Claims] 1. A deflection yoke having a deflection coil in which a plurality of conductive wires are bundled and twisted in a section through a winding portion of a substantially circular winding means, wherein the shape of the substantially circular winding means is: A deflection yoke characterized by being asymmetrical on both sides of the center axis to absorb a change in the linear product of the stranded wires according to the winding direction of the deflection coil in the substantially circular winding means. 2. The deflection yoke according to claim 1, wherein the shape of the winding means is such that the diameters of the winding portions are different from each other on both sides of the central axis. 3. The deflection yoke according to claim 1, wherein the shape of the winding means is such that a winding portion is thick on one side of the central axis.