JPH06125476A - Deflection coil - Google Patents

Abstract

PURPOSE:To obtain a precise magnetic field distribution with excellent reproducibility by forming a uniform magnetic field at a neck of a horizontal deflection winding, forming a pin cushion magnetic field to an opening easily and decreasing the dispersion of the winding distribution for each deflection coil. CONSTITUTION:The invention improves the deflection coil comprising a trumpet shaped insulator 3 in which plural guide grooves 9 separated plural projection separators in the inner face are provided almost along a guide axis direction, a ferrite core yoke arranged to the outside, a horizontal or vertical deflection winding contained in the guide grooves 9 of the trumpet insulator 3, and a vertical or horizontal deflection winding 4 arranged along the inner face of the ferrite core yoke, at least parts of the projection separators forming the guide grooves 9 of the insulator 3 are arranged with a gap inbetween while being divided to a neck side and a face side, the winding contained in the guide grooves 9 of the insulator 3 is extended from the contained grooves of the neck side toward the face side along the guide axis direction and also extended up to the face side through the gap through the outer guide grooves 9 when viewing the center of the coil as features.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube (CRT) deflection coil.

[0002]

2. Description of the Related Art The winding distribution design of a color deflection coil and other high-definition deflection coils varies depending on its design concept, but in the case of a self-convergence type deflection coil for a color CRT that does not include an upper and lower pincushion correction circuit, a horizontally long CRT is used. In general, the horizontal deflection magnetic field is designed to be a uniform magnetic field at the neck and the pincushion magnetic field at the opening, and the vertical deflection magnetic field is generally designed to be a barrel magnetic field. . Recently, high precision C
For RT displays, resolution, misconvergence,
Improvement of quality of geometric distortion is required. Conventionally CR
As the deflection coil for T, the horizontal deflection winding was mainly a saddle type, and the vertical deflection winding was a saddle type or a toroidal type. However, as described above, in recent years, it has been required to improve the quality with an extremely high accuracy, but the above-mentioned saddle type has a large manufacturing variation and a very poor manufacturing yield. Further, in the toroidal type, since the leakage magnetic field of the deflection magnetic field is considered to be harmful to human health, recently, the saddle type has become the mainstream. However, as described above, the saddle type winding has a problem of manufacturing variations, and therefore a means capable of precisely controlling the winding is required.

An example of a conventional deflection coil in which both the horizontal deflection winding and the vertical deflection winding are saddle type is shown in FIGS.
Is shown in. That is, this deflection coil is an example in which the vertical deflection winding 2 is arranged in a saddle shape on the inner surface of the yoke core 1 and the horizontal deflection winding 4 is arranged along the inner surface of the insulator 3 via the insulator.

[0004]

However, if the vertical and horizontal deflection windings are both saddle type as described above, the manufacturing yield is very large and the manufacturing yield is very poor. The cause is that the windings are sequentially packed in the mold and wound up and down, so the position of the windings shifts for each deflection coil, and the reproducibility of the winding density and winding distribution becomes poor. The variation becomes large.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problem of large variation in the conventional saddle-saddle type production as described above.

That is, in the deflection coil of the present invention, in order to improve the reproducibility in the production of the winding position, a convex separator for forming a guide groove is provided in the insulator, at least a part of which is provided with a gap therebetween. The windings housed in the guide groove of the insulator extend from the guide groove on the neck side along the tube axis direction toward the face, and then are aligned. It is characterized in that it has a winding portion that extends to the face side through a guide groove on the outside as viewed from the center of the coil through the gap. By having such a winding portion, desired neck side winding distribution and face side winding distribution can be realized.

More preferably, the winding accommodated in the guide groove of the insulating material is, in addition to the above-mentioned winding portion (referred to as winding portion A), overlaps with the winding portion A and has a guide groove on the neck side. To a face side (hereinafter referred to as a winding portion B). As described above, the presence of the winding portions A and B facilitates the winding distribution design and improves the reproducibility. The reason why the winding portion A is on the bottom side of the guide groove and the winding portion B is on the upper side is to prevent the shape of the winding from being deformed and to perform the winding with good reproducibility.

[0008]

According to the present invention, a self-convergence type color C without an upper and lower pincushion correction circuit is provided.
In order to form the magnetic field required for the RT deflection coil, it is easy to arrange the opening side winding portion distribution outside as a wide angle position when viewed from the center of the coil, compared to the neck side winding distribution. it can.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in FIGS. The following example shows an example of a structure suitable for applying a saddle type horizontal deflection winding to an insulator, but the principle of the present invention is the same when applying a saddle type vertical deflection winding to an insulator. Applicable. The parts corresponding to the members in FIGS. 1 and 2 are indicated by the same symbols.

FIG. 3 is a side view of the deflection coil of the embodiment of the present invention, and FIG. 4 is a front view seen from the opening side (face side). The basic structure of the deflection coil of this example is similar to that of FIG. 1, and a ferrite having a trumpet-shaped insulator 3 holding a saddle-shaped horizontal deflection winding 4 and a saddle-shaped vertical deflection winding arranged on the outer surface thereof. It is composed of a core yoke 1. As the yoke 1, a trumpet-shaped core or a core having a winding guide groove is used. Further, in these guide grooves, the vertical deflection winding 2 is accommodated with a predetermined number of turns and winding distribution with the help of a plurality of hooks 7 provided along the circumference of the neck and the opening.
A deflection magnetic field in the vertical direction V of FIG. 4 is generated.

On the other hand, the trumpet-shaped insulator 3 is separated by a plurality of convex neck-side separators 12 on the inner surface thereof and a plurality of opening-side convex separators 14 aligned in the tube axis direction with respect to these. Is provided with a guide groove 9. More specifically, the inner surface of the insulator 3 has a pair of left and right long convex separators 16 provided along a horizontal plane H including the tube axis, and an upper and lower surface 1 provided along a vertical plane V including the tube axis. And a pair of long fan-shaped convex separators 18. Further, this inner surface has four convex separators 12 extending vertically above and below each separator 16 (although the outermost one is slightly radial) and along the tube axis direction on the neck side. Two fan-shaped separators 13 are provided on the upper and lower sides, and two fan-shaped separators 13 are radially provided on both sides of each fan-shaped separator 16. Further, the inner surface has, on the opening side, above and below each separator 16, four convex separators 14 substantially aligned with the neck-side separator 12 and one convex separator 14 outside thereof. Hooks 8 for hooking the windings are provided on the inside and outside of the separator.

As shown in FIG. 4, the horizontal deflection winding 4 has a guide groove 9 formed between the neck side separators 12 at first.
From the neck side separator 12 to the opening side separator 14 and then to the opening along the tube axis direction.
5, the guide groove between the opening side separators 14 extends through the guide groove 9 on the outer side when viewed from the center of the saddle coil to the face side, and around the openings with the help of the plurality of hooks 8. It circulates in an arc and reaches a symmetrical position across the vertical plane V, and is wound symmetrically by the groove 9 and the gap 15 between the separators 12 and 14 on the other side. When a predetermined winding distribution is obtained by repeating the predetermined winding in this way, this time, the gap 15 is not passed and the winding portion is overlapped on the existing winding portion and is guided along the pipe axis direction from the guide groove on the neck side. A predetermined number and predetermined distribution of windings, which are extended and then extended to the face side as they are, are completed.

[0013]

According to the above structure, it is possible to easily form a uniform magnetic field on the horizontal deflection winding on the neck side and a pincushion magnetic field on the opening side, and reduce variations in winding distribution among deflection coils. However, the refined magnetic field distribution can be obtained with good reproducibility. This makes it possible to design the distribution of the windings so that a desired magnetic field distribution can be obtained by using the gaps 15, and when the windings passing through the gaps 15 are set to the lower side and the windings extending in the tube axis direction are provided, Reproducibility is further improved by fixing the side winding to a fixed position.

[Brief description of drawings]

FIG. 1 is a side sectional view of a deflection coil having a conventional saddle-saddle type deflection winding.

FIG. 2 is a front view of a ferrite core yoke as viewed from the opening side.

FIG. 3 is a side view of the deflection coil of the present invention.

FIG. 4 is a front view of the deflection coil of the present invention viewed from the opening side.

[Explanation of symbols]

 1 Ferrite Core 2 Vertical Deflection Winding 3 Insulator 4 Horizontal Deflection Winding 5 Guide Groove 7, 8 Hook 9 Guide Groove 12, 13 Neck Side Separator 14 Open Side Separator 15 Gap 16, 18 Separator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Saburo Miyakoshi 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDK Corporation

Claims (2)

[Claims] 1. A trumpet-like insulator having an inner surface provided with a plurality of guide grooves separated by a plurality of convex separators substantially along the tube axis direction, a ferrite core yoke arranged outside thereof, and In a deflection coil comprising a horizontal or vertical deflection winding housed in the guide groove of a trumpet-shaped insulator and a vertical or horizontal deflection winding arranged along the inner surface of the ferrite core yoke, the guide groove of the insulator is provided. At least a part of the convex separator forming the above is divided and aligned on the neck side and the face side with a gap therebetween, and the winding wire housed in the guide groove of the insulator is a guide groove on the neck side. To a face side along the tube axis direction, and then extends to the face side through a guide groove outside when viewed from the center of the coil through the gap. Deflection coil. 2. The winding wire housed in the guide groove of the insulator extends from the housing groove on the neck side along the tube axis direction,
Next, the winding portion passing through the gap and passing through the guide groove on the outer side when viewed from the center of the coil and the neck portion are overlapped on the winding portion and extend from the guide groove on the neck side in the pipe axial direction. The deflection coil according to claim 1, further comprising a winding portion that extends and then extends to the face side as it is.