JP2000003673A - Coil former of deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil former preventing deviation of magnetic field distribution from the setting value caused by motion of winding wires of a deflection coil by some external force. SOLUTION: This former 1 comprises a winding frame body 10 formed approximately cylindrically along a funnel part of a cathode ray tube, and several conducting wire guide grooves 21 formed in respective inner surfaces of a large-diameter side end part 12 and a small-diameter side end part 11 except for an intermediate part 13 of the winding frame body 10. The conducting wires are wound through the conducting wire guide grooves 21 of the large-diameter side end part 12 and the small-diameter side end part 11, thereby the inner surface of the winding frame body 10 is wound with a deflection coil 4 into a saddle-shape. Here, a large number of columnar projections 3 are provided on the inner surface of the intermediate part 13 of the winding frame body 10, to prevent the conducting wires from moving by external force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil frame of a deflection yoke used for a cathode ray tube of a display device or a television receiver, and more particularly, to a magnetic field distribution deviated from a design value when a winding moves by some external force. The present invention relates to a coil winding frame in which is prevented.

[0002]

2. Description of the Related Art In recent years, as cathode-ray tube display devices have become larger, flatter, and have a wider angle of deflection, higher quality characteristics have been required for deflection yokes used in these display devices. In order to meet such requirements, it is necessary to reproduce the coil winding distribution at the time of manufacturing the deflection yoke with the winding distribution as designed. As a winding method of the deflection yoke for this purpose, there is a slit saddle winding method.

FIG. 4 is a front view of a coil winding frame of a conventional saddle type deflection yoke of this type as viewed from a large diameter side. In FIG. 4, reference numeral 1 denotes a coil winding frame of a deflection yoke, which is composed of a winding frame main body 10 formed substantially in a cylindrical shape along a funnel portion of a cathode ray tube, and a conductive wire guide groove 21 described later. Reference numeral 2 denotes a conductive wire guide member that protrudes from the inner surface of the bobbin main body 10 and extends in the axial direction. The wire guide member 2 is provided in the small-diameter end portion 11 and the large-diameter end portion 12 so as to extend in the axial direction, and is provided with several lines. The adjacent wire guide members 2 form a wire guide groove 21. . And
The deflection coil connects the conducting wire to the large-diameter end 12 and the small-diameter end 1.
The wire is wound around the inner surface of the bobbin main body 10 in a saddle shape by being wound through the one conductive wire guide groove 21. In other words, by positioning the conductor on the inner surface of the bobbin main body 10 via the conductor guide groove 21, the conductor is wound in a saddle shape. FIG. 5 is a front view of the deflecting coil wound in this way as viewed from the large diameter side.

However, the conventional coil winding frame 1 has a wire guide groove 21 in an intermediate portion 13 between the small-diameter end and the large-diameter end.
Is not formed. This is because the wires wound from the small diameter side to the large diameter side or from the large diameter side to the small diameter side are not necessarily at the same angle. Therefore, the intermediate portion 13 where the conductive wire guide groove 21 is not formed has nothing to position the conductive wire, so that the conductive wire is easily moved. For example, when touched by hand, it was in a state where it easily moved in the direction of the arrow shown in FIG. In the above description, the small-diameter end is an end that becomes the neck side when the deflection yoke is mounted on the cathode ray tube, and the large-diameter end is an end that becomes the screen side. is there. In addition, since the vertical deflection coil has no coil winding and is wound on the inner surface of the ferrite core, in this specification, the coil winding means the winding of the horizontal deflection coil. Therefore, FIG. 5 also shows a horizontal deflection coil.

[0005]

In the coil winding frame of the conventional deflection yoke as described above, the conducting wire guide groove 21 is not formed in the intermediate portion 13 between the small-diameter end and the large-diameter end. In addition, the intermediate portion 13 did not have anything for positioning the conductor, and the conductor was in a state where it could easily move. When the conductor of the deflection coil moves, the magnetic field distribution deviates from the designed value, and the screen characteristics cannot be obtained according to the designed value. Therefore, it is necessary to correct the shifted magnetic field distribution by another means. For this reason, for example, the time required for screen adjustment in the deflection yoke manufacturing process of performing correction using a magnet increases, and further, the defect rate increases, and there is a major problem that productivity of the deflection yoke is hindered. . As a means for solving this problem, there is a means for fixing the coil winding frame and the deflecting coil wire by applying an adhesive or the like after winding the conductive wire around the coil winding frame. However, the adhesive harmless to the coil winding frame and the deflecting coil wire is limited and special and expensive. Further, there is another problem that the curing time of the adhesive is required, and in order to cure the adhesive in a short time, it becomes an ultraviolet curable resin, and new equipment is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a large number of columnar projections provided on an inner surface of an intermediate portion of a substantially cylindrical frame along a funnel portion of a cathode ray tube. Accordingly, it is an object to obtain a coil frame of a deflection yoke in which a winding of a deflection coil is prevented from moving by an external force.

[0007]

A coil bobbin of a deflection yoke according to the present invention excludes a bobbin main body formed substantially in a cylindrical shape along a funnel portion of a CRT and an intermediate portion of the bobbin main body. A plurality of conductor guide grooves formed in the inner surface of the large-diameter end portion and the small-diameter end portion so as to extend in the axial direction, and passing the conductor through the large-diameter end portion and the small-diameter side end portion. In the coil frame of the deflection yoke, in which the deflection coil is wound in a saddle shape on the inner surface of the bobbin body by being wound around, a large number of columnar shapes that prevent the conducting wire from being moved by an external force on the inner surface of the intermediate portion of the bobbin body A projection is provided. Further, the tip of the columnar projection is formed in a hemispherical shape. further,
The tip of the columnar projection is formed in a conical shape.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a front view showing the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of the conductor guide member and the protrusion in FIG. 1 and 2, the same parts as those of FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted. The first embodiment differs from the conventional example in that a columnar projection 3 is provided. The protrusions 3 have approximately the same height as the wire guide member 2, and are provided in large numbers on the inner surface of the intermediate portion 13 of the bobbin main body 10. Also,
The projections are arranged with a gap between the projections so that a conductive wire constituting the deflection coil can enter. Note that, in FIG. 1, portions b, c, and d are not shown in FIG. 1, but the protrusions 3 are omitted, but are provided similarly to the portion a. According to the first embodiment, when the conducting wire is positioned by the conducting wire guide groove 21 and the deflection coil is wound, the conducting wire enters between the protrusions, so that an external force is applied to the conducting wire after the deflection coil is completed. However, it does not move because it is blocked by the projection 3. Further, since the protrusion 3 is formed in a columnar shape and does not extend long in the axial direction like the conductive wire guide groove 21, the angle of each wire wound from the small diameter side to the large diameter side or from the large diameter side to the small diameter side is changed. Even if they are different, the deflection coil can be wound without any trouble.

Although the tip of the projection 3 is formed in a hemispherical shape (see FIGS. 2 and 3A), it may be formed in a pointed conical shape as shown in FIG. 3B. Good. The effect of preventing the conductor from moving under external force is the same. Next, in the above description, the protrusions 3 have the same height as the wire guide member 2 and are arranged with a gap into which the wire can enter between the protrusions. The same effect can be obtained even if the height is made lower than the above height and the gap between the projections is made narrower than the above, so that the deflection coil winding is put on the projection 3. In this case, the same effect can be obtained even if the tip of the projection 3 is hemispherical or conical. However, when the wire type of the conductive wire is a litz wire (a wire obtained by bundling a large number of fine wires), the thin wire is easily cut, so that a hemispherical shape is preferable.

[0010]

As described above, the present invention relates to a bobbin main body formed substantially in a cylindrical shape along the funnel portion of a cathode ray tube, and a large-diameter end portion and a small-diameter side portion excluding an intermediate portion of the bobbin main body. A plurality of conducting wire guide grooves formed in the inner surface of the end portion so as to extend in the axial direction, and winding the conductor by passing the conducting wire through the conducting wire guide grooves at the large-diameter end and the small-diameter end. In a coil frame of a deflection yoke in which a deflection coil is wound in a saddle shape on the inner surface of the body, a large number of columnar projections are provided on an inner surface of an intermediate portion of the frame body to prevent a lead wire from being moved by an external force. Therefore, it is possible to prevent the coil wire from moving due to an external force without requiring any special members or equipment, thereby obtaining a stable winding property and stabilizing the productivity of the deflection yoke.
In addition, there is an effect that a deflection yoke capable of obtaining a high-quality screen performance as designed can be produced.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the conductor guide member and the protrusion in FIG.
It is sectional drawing by a line.

FIG. 3 is a cross-sectional view illustrating a shape of a tip of a projection.

FIG. 4 is a front view of a coil winding frame of a conventional saddle type deflection yoke as viewed from a large diameter side.

FIG. 5 is a front view of a conventional deflection coil viewed from a large diameter side.

[Explanation of symbols]

1 coil winding frame, 10 winding frame body, 11 small diameter side end,
12 Large diameter end, 13 Middle part, 2 Conductor guide member,
21 Conductor guide grooves, 3 columnar projections.

Claims (3)

[Claims] 1. A bobbin main body formed substantially cylindrically along a funnel portion of a cathode ray tube, and inner surfaces of a large-diameter end portion and a small-diameter side end portion excluding an intermediate portion of the bobbin main body in an axial direction. A plurality of conductive wire guide grooves formed by extension, and a lead coil is wound through the conductive wire guide grooves at the large-diameter end portion and the small-diameter side end portion, whereby a deflection coil is formed on the inner surface of the bobbin main body. In a coil bobbin of a deflection yoke wound in a saddle shape, a large number of columnar projections are provided on an inner surface of an intermediate portion of the bobbin main body to prevent the conductive wire from moving by an external force. Yoke coil winding. 2. A coil bobbin for a deflection yoke according to claim 1, wherein the tip of the columnar projection is formed in a hemispherical shape. 3. The coil bobbin of a deflection yoke according to claim 1, wherein the tip of the columnar projection is formed in a conical shape.