JPH0272548A - Deflection yoke - Google Patents

Abstract

PURPOSE:To improve the deflection efficiency of a deflection coil by installing a tongue projected to the side of a neck section on a molding at an opening section side to be installed at a magnetic substance such that the fringe of the opening section of a deflection coil is passed through the tongue. CONSTITUTION:A tongue 10 projected to the neck section side along the face of the magnetic substance 9 from a center position between both sides of a molding 8 installed at a magnetic substance 9 is installed on the molding 8. In case of a wire 11 of a vertical deflection coil, a winding 11a goes along the inside of the magnetic substance 9 and is caught by a projection 8a of the molding 8 and goes along the outside of the magnetic substance 9 to be fitted in the groove of the tongue 10 and then, is caught by a projection 8b, and becomes another winding 11'a which passes along the inside of the molding 9. A portion between the projections 8a and 8b of this wire 11 becomes an opening fringe 11b. So, the length of the opening fringe 11b becomes shorter than that in case it goes along the molding 8 at the opening side of the magnetic substance 9. Thereby, it is possible to reduce the resistance of a deflection coil so that the deflection efficiency is 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, and particularly 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 for color television receivers and color monitors have so-called semi-semi-shaped tubes, in which the horizontal deflection coil is saddle-shaped and the vertical deflection coil is wound in a toroidal shape around a magnetic material, 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 reducing space.

However, when compactness is achieved in this way,
When a magnetic piece of the chassis or metal fittings approaches the deflection yaw, the magnetic flux generated from the outer winding of the magnetic body in a vertical deflection coil wound toroidally around the magnetic body is affected by this magnetic piece. become. Due to this effect, the distribution of the magnetic field generated from the inner winding of 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, the winding portion is not 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 Figure 5, a conventional saddle-shaped deflection coil has a winding section shaped to follow the tube surface of a color cathode ray tube (not shown), which has a trumpet-shaped opening opening from the neck section. I and opening fringe 2 formed at both ends thereof. It consists of a neck fringe 3. Such a deflection coil is placed on the surface of a color cathode ray tube, and is held down by a yoke shown in FIG. However, FIG. 6(a) is a perspective view of this yoke, and FIG. 6(b) is a side view. When the deflection coil and the yoke are attached in this way, the winding portion 1 of the deflection coil is placed between the tube surface of the color cathode ray tube and the magnetic body 4 of the yoke, and the opening flange 2
．． The neck flange 3 is positioned so as to abut an opening molded body 5 and a neck molded body 6 provided at both ends of the yoke, respectively.

In the saddle-shaped deflection coil shown in FIG. 5, the deflection magnetic field is generated in the winding part 1. In order to form a coil shape, the opening flange 2°, the neck flange 3
Is required.

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

Incidentally, in the saddle-shaped deflection coil shown in FIG. 5, a magnetic field is generated not only from the winding portion l but also from the opening fringe 2 and neck portion 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 the opening fringe 2 of the deflection coil as shown in FIG.
This problem is solved by disposing the magnetic flux outside the magnetic body 4 so that the magnetic flux from the opening fringe 2 does not occur inside the magnetic body 4.

[Problem to be solved by the invention]

However, when the deflection coil is wound as shown in FIG. If the peak/peak value of the deflection current flowing in is i□, then the deflection efficiency Pv is expressed as Pv=R−i,,! However, since the resistance R is large as mentioned above, the deflection efficiency Pv is also large. Therefore, from this point of view 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]

In order to achieve the above object, the present invention provides at least one tongue piece protruding toward the neck side on the molded body on the opening side to be attached to the magnetic body, and connects the opening fringe of the deflection coil with the tongue piece. Let it pass through.

[Effect]

By passing the opening fringe through the tongue piece, the length of the opening fringe is made shorter than when the opening fringe runs along the opening-side molded body 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 an embodiment of the deflection yoke according to the present invention, and FIG. 2 is a side view of the same, in which 7 is a molded body, 7a and 7b are projections, 8 is a molded body, 8a and 8
b is a protrusion, 9 is a magnetic material, 10 is a tongue piece, 1. Oa is the groove;
11 is the electric wire of the vertical deflection coil, 1.1 a is the winding part, l
lb is the opening fringe, 11c is the neck fringe, 1
2 is a screen.

In the same figure, the illustration 1. Similar to the outer surface of a color cathode ray tube, the magnetic body 9 has a trumpet-shaped half-body structure that expands from the neck side to the opening, and is molded with protrusions 8a, 8b, etc. at the end on the opening side. The body 8 is provided with a molded body 7 having protrusions 7a, 7b, etc. and a screen 12 having no protrusions at its neck end.

The molded body 7.8 and the screen 12 may be molded separately and attached to the magnetic body 9, or may be integrally molded.f. ·good.

Furthermore, the molded body 8 is provided with a tongue piece 10 that protrudes along the surface of the magnetic body 9 from a center position from both ends toward the neck side, and this tongue piece 10 has a large number of grooves 1.
0a is carved perpendicularly to the direction in which the tongue piece 10 protrudes.

In such a configuration, the vertical deflection coil is wound as follows.

That is, to explain this for one winding, the electric wire 11 of this vertical deflection coil has one winding portion 11a.
As shown by two broken lines, the tongue piece 10 passes along the inner surface of the magnetic body 9, and in the molded body 8, it is hooked on the protrusion 8a at one end and runs along the outer surface of the magnetic body 9.
is fitted into the groove 10a of the magnetic body 9, and further along the outer surface of the magnetic body 9.
After that, it becomes another winding part 11a that is hooked on the protrusion 8b at the other end of the molded body 8 and runs along the inside of the magnetic body 9. The portion between the protrusions 8a and 8b of this electric wire 11 becomes the opening fringe pano 1.1b. It's a cow, molded body 7
At this point, the electric current 7b passing through the inner surface of the magnetic body 9 is caught and passes between the molded body 7 on the outer surface of the magnetic body 9 and the screen 12, and then the protrusion 7a at the other end of the molded body 7.
The winding part 1
It becomes 1a.

In this way, at the opening fringe Ilb, the electric wire 11 passes through a path away from the molded body 8 on the outer surface of the magnetic body 9 due to the tongue piece 10; The length of the wire is made shorter than that of the winding method shown in FIG.

Here, regarding the difference in length of the aperture fringe between this embodiment and the prior art shown in FIG.
This will be explained using figures.

In FIG. 3, the magnetic body 9 has a trumpet-shaped half structure as described above, and the electric wire at the opening fringe of the vertical deflection coil is
(not shown), but in the above embodiment, as shown in the figure, it passes off from the side of the magnetic body 9 on the opening side.

Therefore, as shown in FIG. 4(a), the magnetic body 9 is a cone with an apex angle of 2θ and a base radius of R, and the base is an Xy of the x, y, z coordinate system. In the case of the prior art shown in FIG. 7, the length f of the electric wire 11 at the opening fringe of the vertical deflection coil is equal to the bottom surface of the cone. Since it is the circumference of a semicircle, j! ='/2x2πR-πR-.-(1).

On the other hand, in the case of the above embodiment, since the electric wire 11 passes through as shown in FIG. The length of the intersection locus of the cone and a plane that is inclined and intersects the xy plane on the y-axis is the length of the electric wire 11 at the opening fringe 11b.

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, and this length becomes the minimum when the angle ψ between the above plane and the bottom of the cone is θ (proof is omitted). , the resulting ellipse is such that 1/2 of the length of its long sleeve is the radius R1 of the bottom surface of the cone, and I/l of the short axis length is x in Fig. 4(a).
According to FIG. 4(b) showing the cross section along the z plane, Rco
sθ. Therefore, the peripheral length l° of this approximately semi-ellipse is at least compared to the peripheral length i of the semicircle! >2”.

Therefore, if we take a normal 90" deflection or 1100" deflection color cathode ray tube as an example, θ is about 25° to 35°,
The length of the opening fringe 2゛ is 2.99R ~ 2゜86
R, which is about 4.8 to 8.9% shorter than the length l of the aperture fringe in the prior art shown in equation (1) above. Therefore, the deflection efficiency Pv also decreases by this amount.

In the above embodiment, one tongue piece is used, but two or more tongue pieces may be provided. Thereby, the length of the aperture fringe can be minimized with even higher precision.

〔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. Because 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. Also,
The deflection coil is a molded body on the opening side or neck side,
Furthermore, since the wire is positioned and wound using the tongue piece, the winding precision is high. Therefore, the variation in the deflection magnetic field can be greatly reduced, the work to correct misconvergence can be simplified, and the winding work is also easier. This makes it possible to provide a high-performance, low-cost deflection yoke.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of a deflection yoke according to the present invention, FIG. 2 is a side view thereof, FIG. 3 is a diagram schematically showing a method of winding a deflection coil in this embodiment, and FIG. The figure is a diagram for explaining the length of the opening fringe of the deflection coil in this embodiment, Figure 5 is a perspective view showing a conventional saddle-shaped deflection yoke, and Figure 6 (a) is a conventional molded body. FIG. 7 is a perspective view showing a magnetic body having a magnetic body, FIG. 7B is a side view, and FIG. 7.--Molded body on the neck side, 7a,
7b--Protrusion, 8--Molded body on opening side, 8a, 8b--Protrusion, 9
・------ Monomagnetic material, 10-=- tongue piece, 10a・-
--- Groove, 11 --- Saddle-shaped deflection coil electric wire, 11 a --- Winding section, l l b
=--Opening fringe, 1lc-- Neck fringe, 12--Screen. Figure 1 Figure 2 Gauze Figure 3 Figure 4 (a) (b) Figure 5 Figure 146 Figure fσ Figure 7, 2

Claims (1)

[Claims] A molded body having protrusions is attached to the opening side and the neck side of a magnetic material shaped like a wrap along the tube surface of the cathode ray tube, and the deflection coil is made into a saddle shape, and the winding part of the deflection coil is In the deflection yoke, which is disposed inside the magnetic body, and in which an opening fringe and a neck fringe of the deflection coil are respectively disposed outside the magnetic body, the molded body on the opening side has a tongue protruding toward the neck side. providing at least one piece, and passing the opening fringe of the deflection coil from a protrusion at one end of the molded body on the opening side to a protrusion at the other end via the tongue piece;
A deflection yoke characterized in that the length of the opening fringe can be shortened.