JPH0329192B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in deflection yokes used in cathode ray tubes.

As is well known, a color cathode ray tube uses a deflection yoke in which the horizontal and vertical deflection coils each include a pair of saddle-shaped coils, a trodal coil, or a combination of a saddle-shaped coil and a trodal coil. Among these, saddle-type deflection coils are produced by attaching two winding forms to a winding machine and slip-winding (winding) the wire into the saddle-shaped gap formed between these winding forms, as is conventionally known. Wrap it into a saddle shape,
It is usually created by applying electricity to the coil to generate heat after winding, melting the adhesive layer around the strands of wire, and fusing each strand of wire together to form a single piece. . In this case, the strands are 1→2→3→4→5 as shown by arrows in FIG.
(Corresponding to 1) → 2... It is slip-wound (rolled) into a winding die in the order of 2... and is formed into a predetermined saddle shape, but at each point 2, 3, 4 and 5 in the figure. The problem is that the distribution of the strands wound on the winding form becomes uneven due to differences in the direction change of the strands and differences in the sliding direction of the strands on the surface of the winding form, resulting in asymmetrical winding distribution on both sides. It was hot. For example, the winding distribution on one side is uniform, and the winding distribution on the other side has a dense portion. Therefore, when a pair of such saddle-shaped coils is used to form a horizontal or vertical deflection coil, as shown in the cross-sectional view in Fig. They are arranged symmetrically with respect to the Z-axis, which is perpendicular to the Y-axis. Therefore, the generated magnetic field and the resulting characteristics of the cathode ray tube screen are also Z-axis symmetrical.
In other words, it becomes point-symmetrically unbalanced. As is well known, it is extremely difficult to correct such distortions from the outside.

The present invention was made in order to eliminate the above-mentioned drawbacks, and a deflection coil is configured as a pair of one coil wound in one direction and one coil wound in the opposite direction, and the winding distribution is unbalanced. This provides a deflection yoke that is symmetrical about the X-axis or the Y-axis.

Hereinafter, one embodiment of the present invention will be described in detail.

In the present invention, one of a pair of horizontal or vertical coils is first moved 1→2→3→4→5 (corresponding to 1) as shown by arrows in FIG. 3A and FIG. 4A.
It is formed by slip-winding (winding) the strands of wire into the saddle-shaped gap of the winding mold in the following order: →2. That is, it is formed in the same manner as conventionally. Next, as shown by the arrows in Figures 3B and 4B, this time in the completely opposite direction to Figures 3A and 4A, 1'→2'→3'→4'→ 5′ (corresponds to 1′) → 2′
The other coil of the pair is formed by winding the winding wire into the saddle-shaped gap of the winding mold in the following order.

In this way, when one and the other of a pair of deflection coils are wound in opposite directions, for example, if there is a part with a dense winding distribution on the left side of one coil, the other coil will be wound in the opposite direction. Since the windings are wound in the same area on the right side, there will be a part with a dense winding distribution.In the present invention, in which these coils are combined to form a pair of deflection coils, the uneven winding distribution of both coils The dense parts, in this case the dense parts, are at positions 180° different from each other. That is, as shown in the cross-sectional view in FIG. 5, the portion La of one coil 10 with a dense winding distribution and the portion La of a dense winding distribution of the other coil 11 are located at symmetrical positions with respect to the X axis. become. Therefore, since the deflection magnetic field is perpendicular to the X-axis at any point, horizontal-vertical crosstalk is greatly reduced and alignment is simplified. Furthermore, since the correction of deflection errors on the cathode ray tube screen can be performed symmetrically with the X axis, it is simple and easy.
For example, correction of misconvergence, mislanding distortion, etc. is performed using magnetic pieces (composed of a magnetic field receiving part and a magnetic field forming part, such as a cross arm or magnet attached to the head side of the deflection yoke), convergence yoke, and pink tension correction. When correcting with a circuit or the like, it becomes possible to reduce the number of magnetic pieces and simplify the circuit. Furthermore, the adjustment of the winding form is simplified. That is, since the appearance of errors is two-dimensional, there are many excellent advantages such as analysis, adjustment, correction, etc., which can be easily and quickly performed during the design process and during manufacturing control.

In the present invention, since one of the coils is wound in the opposite direction, it goes without saying that the coil connection is completely opposite to that of the conventional method.

As described above, according to the present invention, it is possible to make the winding distribution error of a pair of deflection coils symmetrical about the X-axis or the Y-axis, so that the above-mentioned various errors can be made as compared to the conventional Z-axis symmetrical. The benefits are obtained and the effects are significant. In particular, there is a tendency for systems to add various external correction means for high definition and high resolution to increase in the future, and the present invention can exhibit even more excellent effects in such systems.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram illustrating the winding mode of a conventional saddle-shaped coil, Fig. 2 is a schematic sectional view showing an example of a deflection coil using a conventional saddle-shaped coil, and Fig. 3 A and B are diagrams illustrating the present invention. 4A and 4B are plan views of the winding manner of the saddle-shaped coil of the deflection yoke according to the present invention, and FIG. It is a schematic cross-sectional view to illustrate. 10, 11...Deflection coil, La
...Dense part of winding distribution.

Claims (1)

[Claims] 1. In a deflection yoke having at least one pair of deflection coils, one coil of the pair is wound in a saddle shape by slip winding in one direction, and the other coil of the pair is wound in a direction opposite to that of the one coil. A deflection yoke characterized by slip winding in a saddle shape.