JPH03145040A - Deflection yoke - Google Patents

Abstract

PURPOSE:To improve the deflection efficiency of a saddlelike deflection coil by arranging the opening part fringe of a vertical deflection coil in the outer side of an electromagnetic body without through a mold compact, and reducibly constituting the length of the opening part fringe. CONSTITUTION:A coil, in which the coil length of a fringe part in an opening part 8c is made shortest, is obtained by winding an electric wire 8 into a gap between a male mold 5 and a female mold 4 with a flyer 6 with a winding mold not rotated to be fixed. Thus not only the canceling action for a deflection magnetic field can be reduced but also an opening part 8c fringe can be minimizedly shortened by arranging the fringes, of the opening part 8c of a saddlelike deflection coil and of a neck part 8b, in the outer side of an electromagnetic body 7. This permits the resistance increase of the deflection coil to be restrained and deflection efficiency to be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a deflection yoke used in color cathode ray tubes such as color television receivers and color monitors. This invention relates to a so-called saddle/saddle type deflection yoke.

[Conventional technology]

Conventionally, color cathode ray tubes used in color television receivers and color monitors have a so-called sensor, in which the horizontal deflection coil is saddle-shaped and the vertical deflection coil is wound around a magnetic material in a toroidal shape in order to improve deflection efficiency. A deflection yoke called a toroidal type has been used.

On the other hand, color monitors have recently become more compact because they are used on desks and the like.

In such compact color monitors and compact color television receivers, the chassis is designed to be closer to the color cathode ray tube, thereby saving space.

However, when compactness is achieved in this way, magnetic pieces such as the chassis and metal fittings get closer to the deflection yoke, and the outer windings of the magnetic material in the vertical deflection coil, which is wound toroidally around the magnetic material, move closer to the deflection yoke. The magnetic flux generated will be affected by this magnetic piece. Due to this influence, the distribution of the magnetic field generated from the @ line part inside the magnetic material in the vertical deflection coil and used to deflect the electron beam is disturbed, and as a result, the convergence characteristics of the screen displayed on the color cathode ray tube and the screen There was a problem that distortion performance deteriorated.

One way to counter this is to make the vertical deflection coil also saddle-shaped. When the winding is made into a saddle shape, no @ wire portion is provided outside the magnetic body, so even if the chassis, metal fittings, etc. are brought close to the deflection yoke, the influence of these on the deflection magnetic field becomes very small.

As shown in Fig. 8, a conventional saddle-shaped deflection coil has a winding part 1 formed to follow the tube surface of a color cathode ray tube (not shown), which is shaped like a trumpet opening from the neck part to the opening part. , an opening fringe 2 and a neck fringe 3 formed at both ends thereof. Such a deflection coil is placed on the tube surface of a color cathode ray tube.

In the saddle-shaped deflection coil shown in FIG. 8, a deflection magnetic field is generated in the winding part 1, but in order to form a coil shape, an opening fringe 2, a neck fringe 3 are required.
Is required.

The manufacturing method for such a saddle-shaped deflection coil is usually to wind an electric wire between a gap between a winding form consisting of a male die and a female die, and then apply electricity to the electric wire and heat it to bond the electric wires together. It is molded and pressed into a saddle shape.

By the way, in the saddle-shaped deflection coil shown in FIG. 8, a magnetic field is generated not only from the winding portion 1 but also from the opening fringe 2 and the neck fringe 3.

The magnetic fields generated from these do not contribute to the deflection of the electron beam, but act in a direction to cancel the main magnetic flux generated from the winding portion 1. Therefore, when the vertical deflection coil is made into a saddle shape, there is a problem that the deflection efficiency is lower than when it is made into a toroidal shape. However, this problem has conventionally been solved by arranging the opening fringe 2 of the deflection coil outside the magnetic body 7, as shown in FIG. I am trying to resolve this by doing the following.

[Invention tries to solve! I topic]

However, when the deflection coil is wired as shown in FIG. 10, the electric wire used in the aperture fringe 2 becomes very long, and the resistance R of the deflection coil increases accordingly. Here, if the peak/peak value of the deflection current flowing through this deflection coil is lpp, the deflection efficiency Pv is expressed as Pv-R-1pp'', but since the resistance R is large as described above, the deflection efficiency Pv It will also get bigger and worse.

Therefore, from this point as well, if the vertical deflection coil is made into a saddle shape, the deflection efficiency will be lower than if it is made into a toroidal shape.

SUMMARY OF THE INVENTION An object of the present invention is to provide a deflection yoke that solves these problems and improves the deflection efficiency of a saddle-shaped deflection coil.

[Means to solve the problem]

The conventional winding die for winding saddle-shaped coils is a method in which electric wire is wound in the gap between the male die and the female die and heated by energization.
In this case, as shown in FIG. 9, when taking out the coil from the winding form, the male die 5 and the female die 4 are opened in the axial direction and taken out.
The coil fringe portion must be perpendicular or trumpet-shaped with respect to the winding portion (reference numeral 1 in FIG. 8) that generates the main magnetic flux.

In the present invention, as shown in Fig. 4, the winding form is fixed on one side, and the winding form is fixed without rotating, and the i-line is wound into the gap between the male die and the female die by a flyer, so that the opening can be opened. Winding wire with the shortest length of winding wire at the fringe part can be created. To remove the coil from the winding former, the female mold is divided into two as shown in Fig. 5, and after the coil is energized and heated, it can be taken out by opening both sides.

[Operation] By performing flyer winding using a combination of one male mold and a pair of female molds, the length of the opening fringe is made shorter than when the opening fringe runs along the sides of the magnetic material. Thereby, the resistance of the deflection coil can be reduced and the deflection efficiency can be improved.

〔Example〕

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

FIG. 1 is a perspective view showing one embodiment of a deflection yoke according to the present invention, and FIGS. 6 and 7 are a perspective view and a side view of the same deflection coil.

FIG. 4 shows a side view of the former for winding the vertical deflection coil. A female mold 4 is assembled into the male mold 5 via a fixed shaft 9, and the female mold 4 is divided into two parts 4a and 4b as shown in FIG.

In such a configuration, the vertical deflection coil is wound as follows. That is, to explain this for one winding, the electric wire 8 of this vertical deflection coil has the inside of the female mold @
When the line part 8a passes through and reaches point C of the entrance part, the opening fringe 8c passes through the outside of the female die 4 and reaches point C' (the point on the opposite side of C).
・Wind the wire up to (not shown). Furthermore, it passes through the inside of the female die 4 from point C' and marks the neck portion 8b. At this time, the flyer 6 and the winding forms 4 and 5 move as shown by the arrows in FIG.

The opening fringe 8c of the deflection coil wound in this manner is made shorter than in the winding method shown in FIG.

Here, the difference in the length of the aperture fringe between this embodiment and the prior art will be explained with reference to FIGS. 2, 3, and 1.

In FIG. 1, the magnetic body 7 has a trumpet-like half-body structure as described above, and the t-line 8 at the opening fringe of the vertical deflection coil is It passes along the side of the body 7 on the opening side, but in the above embodiment,
As shown in the figure, it passes through the magnetic body 7 off the side on the opening side.

Therefore, as shown in FIG. 2, the magnetic body 7 is a cone with an apex angle of 20 and a base radius R, and the base is located on the XY plane of the x, y, z coordinate system. Assuming that the height direction of this cone is two directions, in the case of the prior art shown in FIG. Although the circumference is
1-1/2 X 2 n r -rt R==--
−=(1).

On the other hand, in the case of the above embodiment, since the electric wire 8 passes through as shown in FIG. 1, the X
The length of the intersection locus of the cone and a plane that is inclined at a predetermined angle θ with respect to the Y plane and intersects the XY plane on the Y axis is the length of the electric wire 8 at the opening fringe 8c. The cross section of the cone cut by this plane becomes approximately semi-elliptical when the angle between this plane and the bottom of the cone is small. The peripheral length of this approximately semi-elliptical shape is the length of the aperture fringe, but this length is minimum when the angle φ between the plane and the bottom of the cone is 00 (proof is omitted). The resulting ellipse is
1/2 of the length of the long axis is the radius R of the bottom surface of the cone, and 1/2 of the length of the short axis is R cos θ, as shown in FIG. 3, which represents a cross section taken along the XZ plane of FIG. 2. Therefore, the peripheral length l' of this approximately semi-ellipse is at least l>l' when compared with the peripheral length l of the semicircle.

Therefore, if we take a normal 90 degree deflection or 110" deflection color cathode ray tube as an example, θ is about 25" to 35 degrees, and the opening fringe length i' is 2.99R to 2.86R. This is about 4.8 to 8.9% shorter than the length β of the aperture fringe in the prior art shown in equation (1). Therefore, the deflection efficiency Pv also decreases by this amount.

〔Effect of the invention〕

As explained above, according to the present invention, by arranging the opening and the neck fringe of the saddle-shaped deflection coil outside the magnetic body, it is possible to not only reduce the canceling effect of the deflection magnetic field, but also to reduce the canceling effect of the deflection magnetic field. Since it can be made as short as possible, it is possible to suppress the increase in resistance of the deflection coil due to the aperture fringes, and it is possible to significantly improve deflection efficiency.

In addition, the deflection coil does not use any molded parts,
The above-mentioned shape can be adopted, and the cost can be made equivalent to the conventional saddle/saddle type deflection yoke.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a deflection yoke according to an embodiment of the present invention, FIGS. 2 and 3 are diagrams for explaining the length of the opening fringe of the deflection coil in this embodiment, and FIG. Figure and 5th
9 is a perspective view schematically showing a winding form and winding method for winding a deflection coil according to the present invention; FIG. 9 is a perspective view showing a conventional saddle-shaped coil form; 10
The figure is a perspective view showing a deflection yoke according to a conventional example. 1...@line part, 2...opening fringe, 3...neck fringe, 4...female type, 5...male type, 6...
・Fryer, 7...Magnetic material, 8...Electric wire, 8a・
...Winding part, 8b...Neck part, 8C...Opening part. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7! Figure 8

Claims (1)

[Claims] A deflection yoke in which a pair of saddle-shaped horizontal deflection coils and vertical deflection coils are disposed inside a magnetic material having a lap shape, and an opening fringe and a neck fringe of both deflection coils are respectively disposed outside the core, A deflection yoke characterized in that a vertical deflection coil opening fringe is arranged outside a magnetic body without using a molded body, and the length of the opening fringe can be shortened.