JPH0240855A - Deflection yoke device - Google Patents

Abstract

PURPOSE:To eliminate the change from the original value of a value of the lateral convergence (XH) on X-axis by forming a magnetic body with a ferrite magnetic material having a magnetization characteristic with a small residual magnetism. CONSTITUTION:A magnetic body 31 is formed by a ferrite magnetic material having magnetization characteristic with a small residual magnetism, so that no change of the value of convergence (XC) of the X-axial center is caused by the deflection of the center beam by the residual magnetism of the magnetic body 31. Thus, the processing for correcting the change of the value of XC by means of a purity convergence magnet is not required. Hence, the change from the original value of the value of XH can be eliminated.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention provides a balance between left and right convergence in the lateral direction on the The present invention relates to a deflection yoke device having a magnetic material for adjustment.

(Prior Art) In the deflection yoke device installed in an image display device using a CRT such as a television receiver, conventionally, due to dimensional variations and assembly variations of each individual component, and furthermore, variations in characteristics of the CRTs to be combined, There has been a problem in that various types of misconvergence occur.

In order to solve this problem, various methods have been considered in recent years. For example, the screen surface 1 as shown in FIG.
1 in the horizontal direction on the X axis (hereinafter referred to as
As shown in FIG.
There is a method of arranging a plate-shaped magnetic body 23 near the neck side bend portion of the picture tube No. 2. Note that FIG. 5 shows a state in which the magnetic body 23 is attached to the front surface of the rear enlarged portion 211 of the coil separator 21. As shown in FIG.

Here, the effect of adjusting the balance between the left and right X by this method will be explained with reference to FIGS. 6 to 8.

Figure 6 shows that the horizontal deflection magnetic field Hx is uniform and the left and right X
, shows a well-balanced convergence pattern. From this state, the magnetic material 23 is placed on the screen surface 1.
When placed on the left side of the saddle-shaped horizontal deflection coil 22 when viewed from the side 1, the horizontal deflection magnetic field Hx is strengthened overall, with the left side where the magnetic body 23 is provided being stronger, as shown in FIG. It will be done. In such a magnetic field distribution, when the electron beam is deflected to the right on the X axis, the blue beam x receives a stronger magnetic field than the red beam O, so the red beam O
(Hereinafter, the XH of such a convergence pattern will be referred to as the XH balance). On the other hand, if the electron beam is deflected to the left on the The convergence pattern X is written as XH minus). Therefore, the magnetic body 23
When is placed on the left side of the saddle-shaped horizontal deflection coil 21, the XH pattern on the right side can be corrected in the positive direction of the X-axis, and the XH pattern on the left side can be corrected in the negative direction. Similarly, if the magnetic body 11 is placed on the right side of the saddle-shaped horizontal deflection coil 22, correction in the opposite direction becomes possible.

From the above, in order to correct the misconvergence shown in FIG. 4 using the magnetic body 23, it is sufficient to provide the magnetic body 23 on the left side of the saddle-shaped horizontal deflection coil 22. As a result, the XH pattern on the right side is corrected in the positive direction, the X, 4 pattern on the left side is corrected in the negative direction, and the left and right X□ are balanced.
Misconvergence is resolved.

In this manner, by providing the magnetic body 23 near the picture tube neck side bend of the saddle-shaped horizontal deflection coil 21, the balance between the left and right XH can be adjusted.

Incidentally, conventionally, the magnetic body 23 has been formed of silicon steel having a large magnetization characteristic of residual magnetism.

However, in such a configuration, there is a problem in that when the left and right balance of XH is adjusted, the value of the convergence (hereinafter referred to as Xc) at the center on the X axis changes.

Below, we will explain how Xc changes due to this residual magnetism.
This will be explained in detail using FIGS. 12 to 12.

FIG. 9 is a diagram showing how the electron beam is scanned.

FIG. 10 is a diagram showing the relationship between electron beam scanning and hysteresis loop when the magnetic body 23 is placed on the left side of the picture tube neck side bend of the saddle-shaped horizontal deflection coil 23, and FIG. It is a figure showing the influence of B.

Figure 12 shows the residual magnetism B when the magnetic body 23 is placed on the right side of the bend on the picture tube neck side of the saddle-shaped horizontal deflection coil 23.
FIG.

Now, when the electron beam passes from the position ■ in Figure 9 to the position ■ and reaches the position ■, the horizontal deflection current IH in Figure 7 is 0.
Therefore, the horizontal deflection magnetic field Hx by the saddle-shaped horizontal deflection coil 21 is not generated. However, residual magnetism B1 is generated in the magnetic body 23. The magnetic field direction of this residual magnetism Bl is the 11th
Shown in Figure (a). As a result, the center blue beam X is shifted to the left, and the pattern of Xc begins to show a negative tendency.

Next, when the electron beam passes from the position ■ to the position ■ and reaches the position ■, residual magnetism B2 is generated.

The magnetic field direction of this residual magnetism B2 is shown in FIG. 11(b).

As a result, the center blue beam x is shifted to the right, and the pattern of Xc begins to show a positive tendency.

However, when the electron beam is located at the position (■), it is during the retrace period, so the effect of the change in the value of Xc does not appear on the screen. Therefore, as a change in the value of Xc, a negative trend change at the position of ■ becomes a problem.

On the other hand, if the magnetic material 23 is placed on the right side of the picture tube neck side bend of the saddle-shaped horizontal deflection coil 22, when the electron beam reaches the position (■), the residual magnetism in the direction of <1) in FIG. B1 occurs. As a result, the red beam O is shifted to the left, and Xc begins to exhibit a positive trend pattern. Furthermore, when the electron beam reaches the position (■), residual magnetism B2 in the direction shown in FIG. 12(b) is generated. As a result, red beam 0 is shifted to the right, and the pattern of Xc begins to show a negative trend. However, in this case as well, when the electron beam is located at the position (■), it is during the retrace period, so changes in the XC value have no effect on the screen. Therefore, the problem with the change in the value of Xc is the change in the positive tendency when the electron beam is located at the position (■).

Table 1 shows the measurement results of changes in the values of X and Xc when the magnetic body 23 is placed on the left side of the picture tube neck side bend of the saddle-shaped horizontal deflection coil 22 and the balance between the left and right X is adjusted. show. Similarly, Table 2 shows the measurement results of changes in the values of XH and Xc when the magnetic body 23 is placed on the right side of the picture tube neck side bend of the saddle-shaped horizontal deflection coil 22. Note that this measurement was performed using a magnetic material 23 with a length of 30 ruis and a thickness of 0.5 M.
This was done using.

Table 1 Table 2 By the way, Xc due to the residual magnetism of such a magnetic body 23
The change in the value of is the utility convergence magnet (
(hereinafter referred to as PCM).

However, when the change in the XC value is corrected by PCM,
There is a problem that the value of XH also changes at the same time. In this case, let α be the amount of change in the value of Xc when the left and right balance of XH is adjusted by the magnetic body 23, and let α′ be the amount of change in the value of XH caused by correcting this change with PCM. There is always a relationship α×α′ between and α′. Therefore, the change in the value of XH caused by correcting the change in the value of Xc by PCM increases as the change in the value of Xc increases.

(Problems to be Solved by the Invention) As described above, in the conventional deflection yoke device in which a magnetic body is provided near the bend on the picture tube neck side of the saddle type horizontal deflection coil to adjust the balance between the left and right XH, Since the above-mentioned magnetic body was made of silicon steel, which has a large magnetization characteristic of residual magnetism, adjusting the balance between the left and right XII will change the value of Xc, and by correcting this with PCM, the value of There was a problem in that the value also changed from its original value.

SUMMARY OF THE INVENTION An object of the present invention is to provide a deflection yoke device in which the value of XH does not change from its original value even if the balance between left and right XH is adjusted using a magnetic material.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the present invention is such that the magnetic body is formed of a ferrite-based magnetic material having a magnetization characteristic with small residual magnetism. .

(Function) According to the above configuration, since the residual magnetism of the magnetic material is small, the residual magnetism hardly affects the electron beam at the center. Therefore, there is no need for PCM processing to correct changes in the value of X due to residual magnetism of the magnetic material, and
It is possible to prevent the value of H from changing from its original value.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1(a) is a plan view of the magnetic body 31, and FIG. 1(b) is a plan view of the magnetic body 31.
is also a side view.

This magnetic body 31 is formed of a ferrite-based magnetic material, and is set to have magnetization characteristics with small residual magnetism. Moreover, this magnetic body 31 is formed into a plate shape, for example, and has a U-shape.

The magnetic body 31 formed in this manner is arranged near the bend portion of the saddle-shaped horizontal deflection coil 22 on the picture tube neck side, as in the conventional case.

Table 3 shows the measurement results of changes in the values of X, Xc when the magnetic body 31 is placed on the left side of the image receiving assistant neck side bend portion of the saddle-shaped horizontal deflection coil 22. Similarly, Table 4 shows the measurement results of changes in the values of X, , and Xc when the magnetic body 31 is placed on the right side of the image receiving neck side bend portion of the saddle-shaped horizontal deflection coil 22. In addition, this 1111j
The length of the magnetic body 31 used in the test was 30Jlj+, and the thickness was 2rut.

In addition, as a CRT, φ32.5JIIN, 110@
Use a 28vFS one, and 2gv as a deflection yoke.
I am using one for FS.

Table 3 Table 4 From Table 3.4, the left and right X
It can be seen that when adjusting the balance of H, the value of Xc hardly changes.

Table 5 compares and shows the 7#1 constant results of the ability to adjust the balance of left and right XH when the magnetic body 31 of this embodiment is used and when the conventional magnetic body 23 is used.

Table 5 From Table 5, if the magnetic body 31 of this example is used,
It can be seen that the balance between the left and right sides of H can be adjusted without changing the original value of H.

As described above, in this embodiment, the magnetic material is
1, the center beam is deflected by the residual magnetism of the magnetic body 31. This is to prevent the value from changing. Therefore, according to this embodiment, since it is possible to eliminate the process of correcting the change in the value of Xc by PCM, it is also possible to eliminate the problem that the value of XH changes from its original value due to this process. .

It goes without saying that the present invention can also be applied to the case where the magnetic body 31 is attached to the rear surface of the rear enlarged portion 211 of the coil separator 21, as shown in FIG. In addition to this, it goes without saying that the present invention can be applied to deflection yoke devices in general in which a magnetic body is disposed near a bend on the picture tube neck side of a saddle-type horizontal deflection coil.

[Effects of the Invention] As described above, according to the present invention, the left and right balance of X II can be adjusted without changing the original value of X of the saddle-shaped horizontal deflection coil, thereby reducing the number of operating man-hours. It is possible to provide a deflection yoke device that can contribute to the reduction and has a good total balance.

[Brief explanation of the drawing]

FIG. 1 is a plan view for explaining one embodiment of the present invention;
FIG. 2 is a side view, FIG. 3 is a perspective view for explaining another embodiment of this embodiment, FIG. 4 is a diagram showing a misconvergence pattern in the lateral direction on the X axis, and FIG. A perspective view for explaining the arrangement position of the magnetic material, FIG. 6 is a diagram showing a normal compassion pattern, FIGS. 7 and 8 are diagrams showing a convergence pattern when using a magnetic material,
Figure 9 is a diagram showing the movement pattern of the electron beam, Figure 10 is a characteristic diagram showing hysteresis characteristics, Figure 11 and Figure 1.
FIG. 2 is a diagram showing the influence of residual magnetism of a magnetic material on the center beam. 1... Coil separator, 2... Saddle type horizontal deflection coil, 1... Magnetic material.

Claims (1)

[Claims] Near the bend on the picture tube neck side of the saddle-type horizontal deflection coil,
A deflection yoke device having a magnetic body for adjusting the balance of left and right convergence in the lateral direction on the X-axis, characterized in that the magnetic body is formed of a ferrite-based magnetic material having magnetization characteristics with small residual magnetism. Deflection yoke device.