JP2000077013A - Deflection yoke coil former - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a center portion of a flange on a screen side of a saddle type deflection coil in a concave shape by concaving it to an electron gun side even in a conventional winding method. SOLUTION: This deflection yoke coil former includes a male die 1 having a curved surface 3 of a shape that a horn is divided along its axis, a female die 2 having a curved surface 4 which can form a predetermined space with the curved surface 3 corresponding to the curved surface 3 of the male die 1, and engaging means 5 for engaging the male and female dies 1 and 2 while restraining relative positions thereof. The engaging means 5 is protruded on the curved surface 3 of the male die 1 and is formed in an approximately trapezoid shape. Bottom surfaces of the protruded approximate trapezoid, or long sides 8a and 8b are recessed to the electron gun side to form a recessed shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke former for manufacturing a deflection yoke to be inserted into a cathode ray tube such as a picture tube or a display tube of a television.

[0002]

2. Description of the Related Art Generally, a cathode ray tube such as a television picture tube or a display tube of a television has a deflection yoke for deflecting an electron beam emitted from an electron gun from a neck portion to a large diameter portion in the outer shape of a funnel-shaped funnel. Have been.
This deflection yoke applies a magnetic field for horizontally deflecting the electron beam to 0.1 mm. It has a horizontal deflection coil to generate, a vertical deflection coil to generate a magnetic field to deflect in the vertical direction, and a magnetic core, and at least one of the horizontal and vertical deflection coils is provided as shown in FIGS. 7 and 8. Are formed in a saddle-shaped configuration including a parallel line portion 51 wound in a direction along the tube axis and flange portions 52a and 52b provided at both ends thereof.

Conventionally, as a method of manufacturing such a saddle-type deflection coil, a saddle-shaped male mold having a curved surface 54 in which a wrapper is divided along its axis as shown in FIGS. A curved surface 5 capable of forming a predetermined gap between the curved surface 54 of the male mold 55 and the curved surface 54 corresponding to the curved surface 54 of the male mold 55
A method of forming a saddle-shaped coil by arranging both female dies 57 having the same 6 while opposing each other while regulating the relative position by the engaging means 58, thereby winding an electric wire into a gap formed between them. Has been taken.

In this case, the engaging means 58 makes a substantially trapezoidal projection 60 project on the curved surface 54 of the male mold 55, while the tip of the projection 60 fits on the curved surface 56 of the female mold 57. The projection 60 is formed in a substantially trapezoidal shape, as shown in FIG. 11, in which a substantially trapezoidal projection 60 is formed. The bottom side, that is, the large side 63 is linear.

When a deflection coil is manufactured using this deflection yoke winding form, first, as shown in the cross section of FIG. 12, the tip of a projection 60 projecting on a curved surface 54 of a male mold 55 is formed into a female mold 57. The positions of the male mold 55 and the female mold 57 are regulated and combined by fitting into the formed recess 61, and a predetermined gap is formed between the curved surfaces 54, 56 of the male and female molds 55, 57. Next, the self-fusing electric wire 62 is wound into the gap, and when the winding is completed, an electric current is caused to flow through the electric wire 62 to generate heat. With this heat, a thermoplastic resin (polyamide resin, Dissolve epoxy resin). Thereafter, a coil having a predetermined shape is completed by press-molding with the pressing means 59. On the other hand, regarding the performance of the deflection yoke, in recent television receivers and cathode ray tube display devices, since high-quality images are required not only in the central part of the screen surface but also in the peripheral part, the image quality is influenced by the quality. There is a demand for a deflection yoke that realizes a high-quality image that does not generate raster distortion, which is an important characteristic, and high-order raster distortion represented by gull wing.

In this regard, Japanese Patent Laid-Open Publication No. 8-6976 discloses a horizontal deflection coil which is mounted on a funnel-shaped funnel 66 of a cathode ray tube and generates a magnetic field for deflecting an electron beam in a horizontal direction, as shown in FIGS. 67, a vertical deflection coil 68 for generating a magnetic field deflected in the vertical direction, and a magnetic core 69, the center of the screen side B flange portion 67 of the saddle type deflection coil is positioned on the electron gun side A. A technique has been disclosed in which a high-order raster distortion is reduced by forming a concave shape having a concave shape.

[0007]

However, when a saddle-type deflection coil is wound by a conventional winding form, FIG.
As shown in FIG. 16, the screen-side flange 52a of the saddle type deflection coil is provided with a projection 60 serving as a winding engaging means.
The position of the electric wire is regulated by the
In the case of using a conventional winding die having a straight line, the electric wire of the screen side flange portion 62a of the saddle type deflection coil is wound along the surface of the large side 63, so that it is orthogonal to the tube axis. Therefore, it becomes difficult to form the center of the screen-side flange portion 52a of the saddle-type deflection coil in the saddle type deflection coil as disclosed in the above-mentioned publication into a shape that is concave toward the electron gun. Therefore, there is a problem that a deflection yoke in which high-order raster distortion is reduced cannot be realized.

Accordingly, the present invention has been made in view of the above problems, and has a concave shape in which the center of the screen side flange portion 52a of the saddle type deflection coil is recessed toward the electron gun side even with the conventional winding method. It is an object of the present invention to provide a winding form for a deflection yoke that can be formed at a time.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a male type having a curved surface in which a wrapper is divided along its axis, and a male type having a curved surface. And a female yoke having a curved surface capable of forming a predetermined gap with the curved surface, and an engaging means for engaging while regulating the relative position of the two. It is formed in a substantially trapezoidal shape and projected on a male curved surface, and is formed in a concave shape in which the protruding substantially trapezoidal bottom surface, that is, the large side is recessed toward the electron gun. .

In the present invention, the substantially trapezoidal large side of the engaging means for engaging the male and female molds of the winding form for the deflection yoke is recessed toward the electron gun to form a concave shape. By doing so, it is possible to form the coil in a shape in which the center of the screen-side flange portion is depressed toward the electron gun side even with the conventional winding method.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 relate to an embodiment of the present invention. FIG. 1 is a perspective view showing a female mold of a deflection yoke, FIG. 2 is a perspective view showing a male mold of a deflection yoke, and FIG.
Is a diagram showing the shape of the engaging means, FIGS. 4 and 5 are side views showing the relationship between the shape of the engaging means and the windings, and FIG. 6 shows the action of the concave shape formed on the large side of the engaging means. FIG.

As shown in FIG. 1, a winding yoke for a deflection yoke according to the present invention has a saddle-shaped male mold 1 having a curved surface 3 in which a wrapper is divided along its axis, A female mold 2 having a curved surface 4 corresponding to the curved surface 3 and capable of forming a predetermined gap between the curved surface 3 and the curved surfaces 3, 4 of the male mold 1 and the female mold 2;
And an engaging means 5 for engaging the two while regulating the relative position between the two. In addition to this, a pressing means (not shown) for press-forming the electric wire wound around the winding forms 1 and 2 is provided. Means are provided.

In this case, the engaging means 5 has a substantially trapezoidal cross section, and the engaging means provided on the male mold 1 is projected on the curved surface 3 as a projection 6, and the engaging means on the female mold 2 is provided. Is formed on the curved surface 4 with a concave hole 7 into which the tip of the projection 6 is fitted.

In the present invention, as shown in FIGS. 1 to 3, a surface corresponding to the bottom of the substantially trapezoidal shape, that is, the large side 8 (male side 8a, female The side 8b) is formed in a concave shape recessed toward the electron gun.

Next, the operation of the formers 1 and 2 having this configuration will be described. First, at the time of forming a coil, the curved surfaces 3 and 4 of the male mold 1 and the female mold 2 are opposed to each other, and the two are engaged with each other while regulating the relative position via the engaging means 5 to thereby form the curved surfaces 3 and 4. A predetermined gap is formed. An electric wire is wound around this gap, and when the winding is completed, an electric current is applied to the electric wire to generate heat, and the heat dissolves the thermoplastic resin (polyamide resin, epoxy resin, etc.) constituting the outermost layer of the electric wire. . Thereafter, the resin is pressed and molded by a pressing means (not shown) to solidify the resin and complete a coil having a predetermined shape. In this case, the surface on the large side 8 of the engaging means 5 formed in a substantially trapezoidal shape has a concave shape recessed on the electron gun side A, and the curved surface 3 of the male mold 1 divides the trumpet in the axial direction. 6, the line segment 12 <the line segment 11 as shown in FIG. 6, and the tensioned electric wire extends in the direction in which the length of the electric wire is shortened along the curved surface 3, that is, the line segment 1
It moves to two sides and is wound. Thereby, FIG. 4 and FIG.
As shown in (1), the screen side B flange portion 9 of the saddle type deflection coil has a concave shape with respect to the electron gun side A.

The curvature of the concave shape formed on the large side 8 of the engaging means 5 in the winding forms 1 and 2 is not specified.

[0017]

According to the present invention, the male-type and female-type engaging means have a concave shape which is recessed toward the electron gun with respect to the substantially trapezoidal large-side surface. The electric wire to be wound is wound along the concave shape of the engagement means, and it is possible to obtain a deflection coil having a flange portion recessed toward the electron gun. This makes it possible for a picture tube using this deflection coil to obtain high-quality images not only at the center but also at the periphery.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a female mold of a winding form for a deflection yoke according to the present invention.

FIG. 2 is a perspective view showing a male mold of a winding form for a deflection yoke according to the present invention.

FIG. 3 is a view showing a shape of an engagement means according to the present invention.

FIG. 4 is a side view showing the relationship between the shape of the engagement means and the windings according to the present invention.

FIG. 5 is a top view showing the relationship between the shape of the engagement means and windings according to the present invention.

FIG. 6 is a view showing the action of a concave shape formed on the large side of the engagement means according to the present invention.

FIG. 7 is a perspective view showing a conventional deflection coil.

FIG. 8 is a perspective view showing a conventional deflection coil.

FIG. 9 is a perspective view showing a female type of a conventional winding yoke for a deflection yoke.

FIG. 10 is a perspective view showing a male type of a conventional winding form for a deflection yoke.

FIG. 11 is a view showing the shape of a conventional engaging means.

FIG. 12 is a partially broken view of a conventional deflection yoke winding form.

FIG. 13 is a front view showing an example of a deflection coil in which a screen-side flange is formed in a concave shape.

FIG. 14 is a side view showing an example of a deflection coil in which a screen-side flange is formed in a concave shape.

FIG. 15 is a side view showing a deflection coil formed by a conventional deflection yoke winding form.

FIG. 16 is a top view showing a deflection coil formed by a conventional deflection yoke winding form.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Male type 2 ... Female type 3, 4 ... Curved surface 5 ... Engaging means 6 ... Protrusion 7 ... Concave hole 8 ... Large side 9 ... Flange part 11, 12 ... Line segment

Claims (1)

[Claims] 1. A male having a curved surface having a shape obtained by dividing a wrapper along its axis, and a female having a curved surface capable of forming a predetermined gap between the curved surface corresponding to the male curved surface. In a deflecting yoke winding form having a mold and an engaging means for engaging while regulating the relative positions of the two, the engaging means is formed in a substantially trapezoidal shape and is projected on a male curved surface, A winding surface for a deflection yoke, wherein the bottom surface of the substantially trapezoidal shape, that is, the large side is formed in a concave shape recessed toward the electron gun.