JPH02220325A - Manufacture of deflecting coil - Google Patents

Abstract

PURPOSE:To achieve improved accuracy in the number of coil turns by compression-forming electric wire into a prescribed shape with the use of a female mold having more than one set of wire holding grooves on a base and a male mold consisting of more than one forming piece. CONSTITUTION:A deflecting coil which is saddle shaped in appearance is produced by pressing electric wire covered with fusible film into a prescribed form and then energizing the wire to fuse its outer covering. The deflecting coil consists of symmetrical upper and lower parts, each having more than one set of sub-coils. A female mold has a horn-shaped curved surface formed on a single base 12. On the curved surface are provided more than one set of coil guide partition pieces 13, 14a, etc., and grooves to hold electric wires are formed between these guide partition pieces. Electric wires with fusible film are pressed into the grooves with the use of a male mold to form sub-coils 24, 25, 26 with high accuracy in the number of turns.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a deflection coil disposed in a cathode ray tube of a television receiver or the like.

(Prior art) In recent years, deflection yokes with improved astigmatism and raster distortion have been developed, but it is difficult to improve both astigmatism and raster distortion, and it is difficult to improve both astigmatism and raster distortion. The other has deteriorated, and the ability to coexist has reached its limit. As a countermeasure, the deflection coil, which was originally formed in one piece, was divided into two parts, and each coil had an optimal design, for example, one coil was designed to improve Rusk distortion, and the other coil was designed to improve astigmatism. A deflection yoke has been developed that uses a deflection coil that combines these two coils to achieve a balance between improved raster distortion and astigmatism.

Hereinafter, this type of conventional deflection coil will be explained with reference to FIGS. 12 and 13, taking a horizontal deflection coil as an example.

12 and 13 are perspective and side views of a saddle-shaped horizontal deflection coil;

Both are composed of a saddle-shaped inner coil 1 and an outer coil 2. Therefore, a pair of horizontal deflection coils or vertical deflection coils requires two inner coils 1 and two outer coils 2, for a total of four coils.

Further, as an example of the second measure, a deflection coil used in a high-resolution cathode ray tube will be explained with reference to FIG.

FIG. 14 is a diagram of the saddle-shaped deflection coil viewed from the head side, and shows a plurality of sub-coils formed symmetrically on the left and right sides.
A plurality of wire storage grooves 4a, 4b, 5a,
guiding partitions 8a, 8b, 9a for forming respectively 5b, 6a, 6b, 7a and 7b;

9b, 10a and 10b are provided, and a subcoil is formed by winding the electric wire 11 around the above-mentioned wire storage grooves 4a and 4b, 5a and 5b, 6a and 6b, and 7a and 7b.

In the figure, each subcoil is represented by one electric wire 11.

In this way, the deflection coil for conventional high-resolution cathode ray tubes is
In order to obtain a more precise magnetic field distribution, multiple subcoils with different diameters and turns are superimposed to finely adjust the magnetic field distribution.

(Problem to be Solved by the Invention) However, with the above configuration, the first split-layer deflection coil can only be divided into two pieces due to the volume limit of the deflection yoke, and therefore there is a problem that the characteristics vary widely. was there. In addition, with the second sub-coil type deflection coil, it is necessary to change the design of the first winding frame 3 in order to adjust the magnetic field distribution, and a dedicated winding frame is required depending on the purpose of the display monitor. There was a problem. Furthermore, since the electric wire 11 is wound around the winding frame 3, the deflection coil and the cathode ray tube do not come into close contact with each other, resulting in a problem that the sensitivity is reduced.

Furthermore, there is also the problem that the horizontal deflection coil and the vertical deflection coil cannot be wound around the winding frame 3 of the same design.

The present invention solves the above-mentioned problems, and provides a deflection coil composed of sub-coils with high winding precision that are in close contact with the outer peripheral surface of a cathode ray tube.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes a removable female mold in which a plurality of guide partition pieces are divided into the same number as the above-mentioned guide partition walls, and combined with the above-mentioned guide partition pieces. A male mold consisting of a plurality of possible molded pieces is prepared. First, an electric wire coated with a fusion film is wound around the female mold equipped with a guide partition piece, and then the male mold is inserted and the electric wire is energized. The process involves pressing the adhesive film while melting it.

(Function) By the above manufacturing method, on the inner peripheral surface of the female mold with an accurate shape,
Since the wire is wound in the wire storage groove formed by the guide partition piece and then pressed with a male mold, a subcoil type deflection coil having an accurate shape without any deviation of the wire can be obtained.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 to 11, taking as an example a sub-coil type deflection coil composed of three coils.

1, 2, and 3 are a plan view, a side view, and a side sectional view taken along the plane AA' of FIG. 1, respectively, of a female mold for winding electric wire.

In the first time and FIG. 2, the female mold includes a base 12 on which a lattice-shaped inner circumferential surface is formed, and a first coil guide partition piece 13 mounted on the center line of the inner circumferential surface. , and two second coil guide partition pieces 14a and 14b mounted on both sides thereof with a width of the first coil between them.

It also includes two third coil guide partition pieces 15a and 15b mounted on both sides of the third coil with the width of the second coil apart. In addition, each of the above-mentioned guide partition pieces 13°14a,
14b, 15a and 15b have two connecting holes 16a and 16b, 17a and 17b, and 17c and 17d, respectively, arranged in a plane parallel to both the upper and lower end surfaces.

18a and 18b, and 18c and 18d are provided, respectively.

The side sectional view of FIG. 3 shows each of the above guide bulkhead pieces 13° and
a, 14b, 15a and 15b are the base 12
The figure shows the state in which it is attached in close contact with the inner circumferential surface of.

FIG. 4 shows the male mold that fits into the female mold described above at B--B in FIG. 1.
In the side cross-sectional view taken at the B' position, the male type is the first type described above.
A first molded piece 19 for forming a coil, two second molded pieces 20a and 20b for forming a second coil, and two third molded pieces 21a and 21b for forming a third coil,
Fourth molded pieces 22a and 22 that press the side surface of the third coil
b, and the first to third molded pieces 19.20a,
20b, 21a, and a central piece 23 that applies pressing force to 21b.

In addition, the above five molded pieces 19, 20a, 20b
, 21a and 21b are provided with female guide partition pieces 13, 14a, 14b, 15a and 15.
b, respective connection holes 16a and 16b, 17a and 17
Engagement protrusions 24a and 25a that fit into b, 17c and 17d, 18a and 18b, and 18c and 18d, respectively.
, 25b, 26a and 26b are implanted. Although each molded piece is provided with two engaging protrusions, only the engaging protrusions that fit into the connecting holes with the suffixes ``a'' and ``d'' are described with reference numerals.

A method of manufacturing a deflection coil using both male and female types having such a configuration will be described.

In FIG. 5, first, after assembling the female mold, the electric wire on which the barrier film has been formed is wound around the first coil guide partition piece 13 to form the first coil 24, and then two The second coil 25 and the third coil 26 are formed by sequentially winding the second coil guide partition pieces 14a and 14b and the third coil guide partition pieces 15a and 15b.

Next, the male die is inserted, and pressure is applied to the center piece 23 and the fourth molded pieces 22a and 22b while energizing the electric wire. The pressure applied to the center piece 23 is applied to the third molded piece 21 which is in contact with the central piece 23 at the inclined surface.
a and 21b, the second molded pieces 20a and 20b, and the first molded piece 19, respectively, and the third coil 2
6. The second coil 25 and the first coil 24 are connected to the base 12.
The wire is pressed perpendicularly to the inner peripheral surface of the wire so that the molten wire is in close contact with the surface.

FIGS. 6, 7, and 8 are side sectional views showing the disassembly of the male mold. When the electric molding of the deflection coil is completed, the fourth molded pieces 22a and 22b shown in FIG. , remove the center piece 23. Next, the third molded pieces 21a and 2
1b toward the center of the inner circumferential surface of the base 12, the engaging protrusions 26a and 26b and the connecting hole 18b are removed.
and 18d are fitted, so the third coil guide partition pieces 15a and 15b are removed together, resulting in the state shown in FIG. 6.

Next, when the second molded pieces 20a and 20b shown in FIG. 6 are similarly removed toward the center, the second coil guide partition pieces 14a and 14b are also removed together, resulting in the state shown in FIG. 7. .

Subsequently, when the first molded piece 19 shown in FIG. 7 and the first coil guide partition piece 13 integrated therewith are removed, the state shown in FIG. 8 is obtained.

FIG. 9 is a perspective view of the sub-coil type deflection coil manufactured in this way, and the saddle-type deflection coil has the first coil 24. The second coil 25 and the third coil 26 are integrally formed.

FIGS. 10 and 11 are cross-sectional views of the two-part external coil shown in this embodiment and FIG. 12, respectively. In contrast, in the conventional example, the wires are inserted from the circumferential direction as shown by arrows G and H, so the depth of the winding groove is significantly shortened, making it easier to regulate the arrangement of the wires and making it possible to arrange them in an orderly manner. Become.

(Effects of the Invention) As described above, according to the present invention, since the windings can be managed for each subcoil, a deflection coil with high precision and little variation can be obtained. Furthermore, since the base of the female mold can be shared, the manufacturing cost of the mold can be reduced, and at the same time, a deflection coil that closely contacts the cathode ray tube can be obtained.

Therefore, the deflection sensitivity of the cathode ray tube is greatly improved.

[Brief explanation of the drawing]

1, 2, and 3 are a plan view, a side view, and a side view of a female mold for winding and forming a deflection coil according to the present invention, and
4 is a side sectional view of the male type; FIGS. 5, 6, 7 and 8 are side sectional views showing the manufacturing process of the deflection coil in order; FIG. FIG. 9 is a perspective view of a deflection coil obtained by the manufacturing method of the present invention, FIGS. 10 and 11 are cross-sectional views of the deflection coil showing the insertion direction of the electric wire during winding of the present example and the conventional example, respectively. 12th
1 and 13 are a perspective view and a side view of a conventional two-part deflection coil, and FIG. 14 is a view of a conventional deflection coil for a high-resolution cathode ray tube viewed from the head side. 1...Inner coil, 2...Outer coil, 3...
...Winding frame, 4a, 4b, 5a, 5b, 6a. 6b, 7a, 7b-wire storage groove, 8a, 8b. 9a, 9b, 10a, 10b-guiding bulkhead, 11.
...Electric wire, 12...Base, 13...Guiding partition pieces for the first coil, 14a, 14b...Guiding partition pieces for the second coil, 15a, 15b...Guiding partition pieces for the third coil , 16a *16b , 17a t17b,
17c, 17d, 18a, 18b, 18c, 18d
- Connection hole, 19...first molded piece, 20a. 20b--second molded piece, 21a, 21b-third molded piece, 22a, 22b-fourth molded piece. 23... Central piece, 24... First coil, 25...
2nd coil, 26...3rd coil. Patent applicant Matsushita Electric Industrial Co., Ltd. Figures 16a, 16b, 17a, 17b, 17c, 17d, 1
8a, 18b, 18cj8d---i! Keiyourei 132
0, Ouchi bulkhead for the 7th coil 14a, 14b-M2 coil l"l' [inner Mno 15a,
15b -- Atsushi 3-coil internal bulkhead 19, - Atsushi 18 fF Tano 20a, 20b - Tsuta 2 related floods 21a, 21b -, 13A square &/''122a, 22
b-MIJ, Fr1J U23, - Uono 24a, 25a, 25b, 26a, 26b --- Iho mating protrusion diagram Figure 26 - Atsushi 3 coil diagram Figure Figure Hin-A F-7' 0 Figure Figure Figure Figure Figure Figure 8a, 8b, 9a, 9b, 10a, 10b Ouchi bulkhead 11--Electric wire

Claims (1)

[Claims] It consists of a base having a bugle-shaped inner circumferential surface that is the same as the outer circumferential surface of the deflection coil, and a plurality of removable guide partition pieces that form a plurality of sets of symmetrical wire storage grooves along the inner circumferential surface. Using a female mold for winding wire and a male mold consisting of a plurality of molded pieces for compression molding the wound wire, first, the wire with the fusion film formed thereon is sequentially wound into the wire storage groove of the female mold. A method for manufacturing a deflection coil in which a plurality of sub-coils are formed symmetrically by turning the coils, and then the coils are energized and compression-molded using a male die.