JPH03136304A - Core for deflecting yoke - Google Patents

Abstract

PURPOSE:To prevent the generation of cracks in a dividing trench forming part during baking, and facilitate the division from the dividing trench, by forming the dividing trench of a morning-glory type deflecting yoke, in a thick wall part whose thickness is larger than that of the peripheral part. CONSTITUTION:A core 1 for a deflecting yoke gradually increases its thickness from the peripheral part 12 toward a dividing trench 2 forms a thick wall part 11. Said thickness becomes equal to that of the peripheral part 12 at the dividing trench 2. When force is applied during baking, the force is dispersed in thick boundary parts 13, 14, and stress concentration to the dividing trench 2 is decreased. When stress is applied to the dividing trench 2, cracks are hard to be generated because the wall thickness is large as compared with conventional cores.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a core for a deflection yoke used in cathode ray tubes such as televisions, and particularly to a core for a deflection yoke having a morning glory shape divided along dividing grooves. It is.

[Conventional technology]

FIG. 3 is a partially cutaway front view showing a conventional core for a deflection yoke, FIG. 4 is a bottom view thereof, and FIG.

6 is a perspective view showing the dividing process, (1) is a morning glory-shaped deflection yoke core made of a sintered body of ferrite powder, (2) is a core ( ) are split grooves formed on the opposing surfaces of the outer and inner surfaces of the core (1), (3) and (4) are split cores that are split by the split groove (2), (5) and (6). ) is each divided core (
3) This is the clip groove formed in (4).

The above deflection yoke core (1) is divided into two divided cores (3) and (4) by the sintering machine dividing groove (2), and after one winding is applied, they are combined into one core, and the opposing clip grooves ( 5).

(6) is used by sandwiching it with □ clips and integrating it.

The manufacturing process for such a deflection yoke core (1) involves first press-molding ferrite powder in a mold in which convex portions corresponding to the dividing grooves (2) are formed in advance, and then molding the ferrite powder at a high temperature of 10-100 degrees Celsius. By sintering.

Obtain the core (1) for the deflection yoke □, and after sintering, the sixth
A chisel with a wedge-shaped tip (7) as shown
is applied to the dividing groove (2), and an impact is applied from above with a hammer (8) to divide it into two.

The reason why it is divided into two parts after firing is as follows.

In other words, core (1) ultimately becomes divided core (3),
Since (4) is used in combination, if the adhesion between the split surfaces is poor, the deflection characteristics will deteriorate. However, when the parts are fired in two parts, the divided surfaces are oxidized in the firing atmosphere, resulting in poor adhesion, and distortion during firing makes the dimensions inconsistent, making it impossible to fit them together. For this reason, a method of dividing the material after firing is used.

However, since the dividing groove forming part (9) is thinner than the peripheral part by the dividing groove (2) so that it is divided into two parts along the dividing groove forming part (9), stress concentration occurs during firing, and the dividing groove forming part ( 9) Cracks occur.

[Problem to be solved by the invention]

As described above, in the conventional core for a deflection yoke, since the thickness of the dividing groove forming portion is thin, cracks form from the dividing groove during firing, and as a result, the dividing surface is oxidized.

There was a problem that problems occurred in adhesion.

The present invention is intended to solve the above-mentioned problems, and provides a core for a deflection yoke that does not cause cracks in the dividing groove forming part during firing and can be easily divided from the dividing groove when dividing. With the goal.

[Means to solve the problem]

The core for a deflection yoke of the present invention is a morning glory-shaped deflection yoke core that is divided along one dividing groove.

The dividing groove is formed in a thick wall portion that is thicker than a peripheral portion.

[For production]

In the core for a deflection yoke of the present invention, after firing, the dividing groove is applied with a chisel or the like to divide it, and the divided core is wound.
be used in combination with the

In this case, by forming the dividing groove in the thick wall part that is thicker than the peripheral part, the thickness of the part where one dividing groove is formed does not have to be thinner than the other parts, so the external stress during firing can be reduced. It maintains enough strength to prevent cracks from forming, and can be easily divided using dividing grooves when dividing after firing.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.

FIG. 1 is a bottom view of FIG. 3 showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line A-A of FIG. 3, and the same reference numerals as in FIGS. or a significant portion. (11) is a thick wall portion that is thicker than the peripheral portion (12). The dividing groove (2) is formed in the thick part (11), and the thickness of the dividing groove forming part (9) is the same as that of the peripheral part (12). The other configurations are the same as those in FIGS. 3 to 6. Further, a dotted line B in the figure indicates the shape of the core (1) of the conventional example near the dividing groove.

The deflection yoke core (1) of this embodiment has a peripheral portion (12
) to the dividing groove (2) to form a thick walled part (11), and at the dividing groove (2), the thickness is the same as that of the peripheral part (12). When force is applied during firing, the force is dispersed to the thick boundary portions (13) and (14), and stress concentration on the dividing groove (2) is reduced. Even if stress is applied to the dividing groove (2), cracks are less likely to occur because the wall thickness is thicker than that of a conventional core.

In addition, when applying a chisel (7) to the dividing groove (2) to divide it into two parts as shown in Figure 6, due to the difference in wall thickness from the first circumference, the dividing groove is split at the thinnest dividing groove forming part (9). be done.

〔Effect of the invention〕

As described above, according to the present invention, since the dividing groove is provided in the thick wall portion that is thicker than the peripheral portion, it is possible to prevent cracks from forming from the dividing groove during firing.

It is possible to obtain a core for a deflection yoke that improves yield, can be easily divided from the dividing groove, and can be manufactured at a lower cost.

[Brief explanation of the drawing]

Fig. 1 is a bottom view of Fig. 3 showing the deflection yoke core of the embodiment, Fig. 2 is a sectional view taken along the line A-A in Fig. 3 showing the same embodiment, and Fig. 3 is the same as the core of the deflection yoke of the embodiment. 4' is a bottom view of the conventional example in FIG. 3, FIG. 5 is a sectional view taken along line AA in FIG. 3, and FIG. 6 is a core for a deflection yoke. FIG. 3 is a perspective view showing a dividing process. In each figure, the same reference numerals indicate the same or corresponding parts, (1)
is the core for the deflection yoke, (2) is the dividing groove, (3), (4
) is the split core, (9) is the split groove forming part, and (11) is the thick part.

Claims (1)

[Claims] (1) A core for a deflection yoke having a morning glory shape that is divided along a dividing groove, wherein the dividing groove is formed in a thick portion that is thicker than a peripheral portion.