JPH01243346A - Deflecting yoke - Google Patents

Abstract

PURPOSE:To improve the magnetic field distribution of the horizontal deflecting magnetic field and simplify the production work by arranging a coil electric wire along multiple guide grooves provided on the inside of mold bobbins, winding a horizontal deflecting coil on the inner face of the mold bobbins in a saddle shape to obtain a deflecting yoke, and integrally forming the mold bobbins in a funnel shape. CONSTITUTION:A pair of mold bobbins 1 of a deflecting yoke are integrally formed in a funnel shape, multiple guide grooves are formed on the inside when these bobbins 1 are formed. A coil winding is arranged along these guide grooves to form a saddle-shaped horizontal deflecting coil 2. Vertical deflecting coils 4 and 4' are wound on half-split funnel-shaped cores 3 and 3' made of a magnetic material in the toroidal shape respectively, the cores 3 and 3' are fitted to the outer face of the mold bobbins 1 facing each other. The horizontal deflecting coil 2 is formed with high precision, the magnetic field distribution of the horizontal deflecting magnetic field is improved, the number of components is reduced, and the assembling work is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a deflection yoke used in color television receivers, color monitors, etc., and particularly to means for forming a horizontal deflection magnetic field.

C. Prior Art] A deflection yoke used in color television receivers, etc. has a molded bobbin provided with a horizontal deflection coil and a vertical deflection coil, and the horizontal deflection coil generates a horizontal deflection magnetic field to direct the electron beam in the horizontal direction. At the same time, a vertical deflection coil generates a vertical deflection magnetic field to deflect the electron beam in the vertical direction. In a color television receiver, the horizontal deflection coil is usually formed in a saddle shape and installed on the inner surface of a mold bobbin, and the vertical deflection coil is formed in a toroidal shape and installed on the inside of the mold bobbin. Provided on the outside of the bottle.

Conventionally, horizontal deflection coils have been formed in advance into a hollow shape by applying pressure, heating, etc., and then attached to the mold bobbin by fixing it to the inner surface of the mold bobbin. Yasumi Kosho 5
As disclosed in Japanese Patent No. 6-19332, a deflection yoke is known in which a plurality of guide grooves are provided on the inner surface of a mold bobbin, a coil wire is arranged along these guide grooves, and a horizontal deflection coil is attached. There is.

To explain this more specifically, as shown in FIG. 2, the bobbin halves 5A and 5B, which are funnel-shaped mold bobbins that have been split in half, each have a plurality of guide grooves 6A and 5B on their inner surfaces.
6B.

Guide grooves 6 are formed on the inner surfaces of these bobbin halves 5A and 5B.
A coil wire is wound along the bobbin halves 5A and 6B to form a horizontal deflection coil, and then these bobbin halves 5A,
5B are combined to form a funnel shape, and both are tightened with an opening fringe holder 9 to form a mold bobbin.

In such a deflection yoke, by forming the guide grooves 6A and 6B with high precision, the precision of the horizontal deflection coil can be improved, and the winding work of the horizontal deflection coil is simplified, making it possible to reduce costs. Become.

[Problem to be solved by the invention]

On the other hand, the mold bobbin is preferably made of materials such as PP (polypropylene) and PP.0 (polyphenylene oxide), and therefore has good mechanical strength. For this reason, when winding the horizontal deflection coils on the bobbin halves 5A and 5B as shown in FIG.
, 5B are deformed. In this way, the bobbin halves 5A, 5
When B is deformed, the horizontally biased coil itself is also deformed.

Further, the bobbin halves 5A and 5B are provided with protrusions 8 and recesses 7 on their respective joining surfaces, and by fitting these protrusions 8 into the recesses 7, the bobbin halves 5A and 5B are joined. Due to the deformation of these bobbin halves 5A and 5B, even if they are tightened with the opening fringe holder 9, the two bobbin halves 5A and 5B are connected so that a gap is formed in a part of the joint surface. will be done.

As a result of the above, the horizontal deflection coil attached to the mold bobbin is deformed, and when such a deflection yoke is attached to the image receptor glass pulp, a positional shift occurs in the horizontal deflection coil.

For this reason, the horizontal deflection magnetic field generated by the horizontal deflection coil becomes asymmetrical, and the distribution of the horizontal deflection magnetic field is disturbed due to the size of the gap that occurs at the coupling part of the bobbin half-hole, making it impossible to obtain fully satisfactory convergence characteristics. There was a problem.

FIG. 3 shows the misconvergence of the red beam R and the blue beam B in a linear raster on the screen. Such misconvergence occurs because an asymmetrical magnetic field distribution is formed.

To explain this specifically, when winding the bobbin half-way in the direction of the solid arrow shown in FIG. 4(a),
The mold bobbin is deformed as shown in FIG. 4(b). When a deflection yoke made of such a deformed mold bobbin is attached to a cathode ray tube, the magnetic field on the neck side of the deflection yoke, which is located near the electron gun of the cathode ray tube, has a large effect on the convergence characteristics, and the magnetic field on the neck side of the horizontal deflection coil Then, as shown in FIG. 5(a), the magnetic field distribution becomes asymmetrical. For this reason, convergence deteriorates as shown in FIG. 3(a).

When the winding direction of the bobbin is half-way in the direction of the dashed arrow shown in Fig. 4(a), the mold bobbin undergoes deformation as shown in Fig. 4(C), which is the opposite of Fig. 4(b). , Figure 5(b)
This results in an asymmetric magnetic field distribution as shown in . For this,
As shown in FIG. 3(b), a misconvergence opposite to that in FIG. 3(a) occurs.

In addition, due to the gap at the joint of the bobbin half, the horizontal deflection coil as a whole forms a barrel-shaped magnetic field, which causes the scanning area of the red beam (solid line) to The scan area of the blue beam (broken line) has a trapezoidal shape tilted in opposite directions, which causes misconvergence.

In recent years, there has been a remarkable trend toward higher screen precision, and in particular, convergence characteristics have become even more demanding, and the above-mentioned conventional techniques are no longer able to cope with this.

In addition, although the above-mentioned conventional technology can avoid problems in winding work, it is necessary to shape each half of the bobbin, and after installing the horizontal deflection coil, these half bobbins are combined to form an opening fringe holder. There is also a problem in that the process of manufacturing the deflection yoke is complicated because it requires installation work.

SUMMARY OF THE INVENTION An object of the present invention is to provide a deflection yoke that solves these problems, provides excellent convergence characteristics, and simplifies manufacturing work.

[Means to solve the problem]

In order to achieve the above object, the present invention has a molded bobbin integrally molded into a funnel shape, a plurality of guide grooves are provided on the inner surface of the molded bobbin, and a coil electric wire is wound along the guide grooves. horizontal deflection coils are attached.

[Effect]

Since the mold bobbin is integrally molded in a funnel shape,
It has sufficient mechanical strength and will not be mechanically deformed during the winding work of the horizontal deflection coil.In addition, the inner shape and guide groove of the mold bobbin can be formed with high precision, and gears will not occur on the mold bobbin. Therefore, the magnetic field distribution of the horizontal deflection field is significantly improved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of a deflection yoke according to the present invention, in which 1 is a mold bobbin, 2 is a horizontal deflection coil, 3 is a core, and 4 is a vertical deflection coil.

In the figure, a mold bobbin 1 is made of, for example, P.P. (polypropylene) or P.P.0 (polyphenylene oxide), and is integrally formed in a funnel shape.

During molding, a plurality of guide grooves (not shown) are also formed on the inner surface of the mold bobbin 1, similar to the conventional example shown in FIG. A coiled wire is wound along these guide grooves to form a saddle-shaped horizontal deflection coil 2.

In addition, a toroidal vertical deflection coil 4.4' is connected to each core 3.3' made of a magnetic material such as ferrite, which has a half-funnel shape.
' are attached to the outer surface of the mold bobbin 1 so as to face each other.

A simple method for winding the horizontal deflection coil '2 on the inner surface of the mold bobbin 1 is to use a funnel-shaped guide similar to the guide groove provided on the inner surface of the mold bobbin 1. This guide plate is inserted into the mold bobbin 1, the guide is aligned with the guide groove, and the extremely thin nozzle from which the coiled wire is drawn is brought into contact with the guide groove through this guide and moved along the guide. Bye. As the nozzle moves, the coil wire is pulled out from the nozzle and fitted into the guide groove. This nozzle may be operated manually, but it may also be moved automatically.

As described above, in this embodiment, a horizontal deflection coil is attached to the inner surface of a molded bobbin integrally molded into a funnel shape, and the molded bobbin is made of a relatively soft material such as PP (polypropylene). Even if the horizontal deflection coil is shaped like a funnel, it has sufficient mechanical strength and will not be mechanically deformed when winding the horizontal deflection coil. Depending on the inner surface shape and the arrangement and shape of the guide grooves, the desired shape can be achieved with high precision.

Furthermore, since there is no gap in the mold bobbin as in the conventional example, the asymmetry and disturbance of the magnetic field distribution due to the horizontal deflection coil are greatly improved, and the work of correcting misconvergence can be simplified.

In addition, compared to the conventional example described above, the mold bobbin molding work is simplified, the bobbin assembly work that takes half a day is eliminated, parts such as the opening fringe holder 9 (Fig. 2) are no longer required, and the deflection yoke assembly Work can also be simplified.

〔Effect of the invention〕

As explained above, according to the present invention, since the horizontal deflection coil can be formed with high precision, the magnetic field distribution of the horizontal deflection magnetic field is significantly improved, making it possible to reduce misconvergence and simplify the correction work. In addition, it is possible to reduce the number of parts and simplify assembly work, making it possible to provide a high-performance, low-cost deflection yoke.

[Brief explanation of the drawing]

FIG. 1 is a structural perspective view showing an embodiment of a deflection yoke according to the present invention, FIG. 2 is an assembled perspective view showing an example of a conventional deflection yoke, and FIGS. A pattern diagram showing an example, FIG. 4 is a diagram showing a modification example depending on the winding direction of the mold bobbin, and FIGS. 5(a) and (b) respectively show the magnetic field distribution by the conventional deflection yoke shown in FIG. Explanatory diagrams showing examples of positional deviations of electron beams, No. 6 to 6. , Yo9. , Yo72) -(,,
Ayu. cormorant. □O 2) Ka-7 This is a map of the law. 1...Mold bobbin, 2...
...Horizontal deflection coil, 3,3'...Core, 4.4'...Vertical deflection coil. Figure 3 (Q) (b)
Figure 4 12222

Claims (2)

[Claims] (1) By providing a plurality of guide grooves on the inner surface of the mold bobbin and arranging the coil electric wire along the guide grooves,
A deflection yoke comprising a horizontal deflection coil wound in a hollow shape on the inner surface of the mold bobbin, the mold bobbin being integrally molded in a funnel shape. (2) In claim (1), a vertical deflection coil is provided on the outer surface of the mold bobbin, the vertical deflection coil being wound around the core in a toroidal shape, or the vertical deflection coil being wound in a saddle shape. A deflection yoke characterized by the provision of a deflection yoke.