JPH0673284B2 - Deflection yoke - Google Patents

Description

The present invention relates to a deflection yoke used for a color cathode ray tube such as a color television receiver and a color monitor, and more particularly to a horizontal deflection coil and a vertical deflection coil. The present invention relates to a so-called saddle / saddle type deflection yoke having a saddle shape.

[Conventional technology]

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

On the other hand, recently, color monitors tend to be compact because they are used on desks and the like. In such a compact color monitor and compact color television receiver, the chassis is designed so as to be close to the color CRT, and the space can be reduced.

However, if compactness is achieved in this way,
A magnetic piece such as a chassis or a metal piece approaches the deflection yoke, and the magnetic flux generated from the winding portion outside this magnetic body in the vertical deflection coil wound in a toroidal shape on the magnetic body is affected by this magnetic piece. It will be. Due to this effect, the distribution of the magnetic field generated from the winding part inside the magnetic body in the vertical deflection coil and for deflecting the electron beam is disturbed, and as a result, the convergence characteristics and the screen of the screen displayed on the color cathode ray tube. There was a problem that the distortion performance deteriorates.

As a countermeasure, one method is to make the vertical deflection coil a saddle type. If the winding is saddle-shaped, the winding portion is not provided outside the magnetic body, so that even if a chassis or a metal fitting is brought close to the deflection yoke, the influence on the deflection magnetic field is extremely small.

As shown in FIG. 5, a conventional saddle type deflection coil has a winding portion 1 formed along a tube surface of a color cathode ray tube (not shown) having a trapezoidal opening from a neck portion to an opening portion. And an opening fringe 2 and a neck fringe 3 formed at both ends thereof. The deflection coil is placed on the surface of the color cathode ray tube and is held by the 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 part 1 of the deflection coil is arranged between the surface of the color cathode ray tube and the magnetic body 4 of the yoke, and the opening flange 2 and the neck flange 3 are respectively formed by opening molding provided at both ends of the yoke. The body 5 and the neck portion molded body 6 are positioned so as to abut.

In the saddle type deflection coil shown in FIG. 5, the deflection magnetic field is generated in the winding portion 1. However, the opening flange 2 and the neck portion flange 3 are required to form the coil shape. Become.

As a method of manufacturing such a saddle type deflection coil, usually, an electric wire is wound between caps of a winding type consisting of a male type and a female type, and then the electric wire is energized and heated to bond the respective wires to each other, and then they are bonded. The electric wire is molded and pressed into a saddle shape.

By the way, in the saddle type deflection coil shown in FIG. 5, 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 the direction of canceling the main magnetic flux generated from the winding portion 1. Therefore, when the vertical deflection coil is of saddle type, there is a problem that the deflection efficiency is reduced as compared with the case of the toroidal type. However, such a problem is that, conventionally, as shown in FIG. 7, the opening fringe 2 of the deflection coil is arranged outside the magnetic body 4, and the magnetic flux from the opening fringe 2 does not occur inside the magnetic body 4. By doing so, we are trying to eliminate it.

[Problems to be Solved by the Invention]

However, when the deflection coil is wound as shown in FIG. 7, the electric wire used in the opening fringe 2 becomes very long, and the resistance R of the deflection coil increases accordingly. Here, assuming that the peak / peak value of the deflection current flowing through the deflection coil is i _pp , the deflection efficiency P _v is represented by P _v = R · i _pp ² , but since the resistance R is large as described above, This is because the deflection efficiency P _v becomes larger and worse. Therefore, also from this point, when the vertical deflection coil is a saddle type, the deflection efficiency is lower than when the vertical deflection coil is a toroidal type.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a deflection yoke capable of increasing the deflection efficiency of a saddle type deflection coil.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides at least one tongue piece projecting to the neck side on a mold body on the opening side to be attached to a magnetic body, and to provide the opening fringe of the deflection coil with the tongue piece. Try to pass through.

[Action]

By passing the opening fringe through the tongue, the length of the opening fringe is made shorter than that when the opening fringe is along the opening-side molded body of the magnetic material. As a result, the resistance of the deflection coil can be reduced and the deflection efficiency is 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 a deflection yoke according to the present invention, and FIG. 2 is a side view of the same, wherein 7 is a molded body, 7a and 7b are protrusions, 8 is a molded body, and 8a and 8b. Is a protrusion,
9 is a magnetic material, 10 is a tongue piece, 10a is a groove, 11 is an electric wire of a vertical deflection coil, 11a is a winding portion, 11b is an opening fringe, 11c is a neck fringe, and 12 is a partition.

In the figure, like the outer surface of a color cathode ray tube (not shown), the magnetic body 9 has a trapezoidal half-split structure extending from the neck side to the opening, and the projections 8a, 8b are formed at the ends on the opening side. A molded body 8 having, for example, a protrusion 7a, 7b, etc. at the end on the side of the neck portion.
And a partition 12 having no protrusion are provided respectively. The molded bodies 7 and 8 and the partition 12 may be separately molded and attached to the magnetic body 9, or may be integrally molded.

Further, the molded body 8 is provided with a tongue piece 10 projecting along the surface of the magnetic body 9 from the center position from both ends to the neck portion side, and the tongue piece 10 has a large number of grooves 10a. Are carved perpendicularly to the protruding direction of the tongue 10.

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

That is, when this is explained for one winding, the electric wire 11 of this vertical deflection coil has one winding portion 11a,
As shown by the broken line, it passes along the inner surface of the magnetic body 9, and along the outer surface of the magnetic body 9 along the outer surface of the magnetic body 9 in the portion of the molded body 8 which is hooked by the projection 8a at one end thereof. After being fitted in the magnetic body 9 and fitted along the outer surface of the magnetic body 9, it becomes another winding portion 11a 'which runs along the inside of the magnetic body 9 by being hooked by the protrusion 8b at the other end of the molded body 8. This wire 11
A portion between the protrusions 8a and 8b serves as an opening fringe 11b. In the molded body 7, the electric wire 11a passing through the inner surface of the magnetic body 9 has the projection 7 at one end of the molded body 7.
The molded body 7 on the outer surface of the magnetic body 9
And the partition 12 and then hooked on the protrusion 7a at the other end of the molded body 7 and along the inner surface of the magnetic body 9 to form the winding portion 11a.

Thus, at the opening fringe 11b, the tongue piece 10
The electric wire 11 passes through the path on the outer surface of the magnetic body 9 which is separated from the molded body 8, which causes the opening fringe.
The length of the electric wire 11 at 11b is made shorter than that of the winding method shown in FIG.

Here, the difference in the length of the opening fringe between this embodiment and the prior art shown in FIG. 7 will be described with reference to FIGS. 3 and 4.
It will be described with reference to the drawings.

In FIG. 3, the magnetic body 9 has a trapezoidal half-divided structure as described above, and the electric wire at the opening fringe of the vertical deflection coil is the magnetic body 9 in the prior art shown in FIG.
Although it passes along the side of the opening of the magnetic body 9 (not shown), in the above-described embodiment, it passes away from the side of the magnetic body 9 on the side of the opening as illustrated.

Therefore, as shown in FIG. 4 (a), the magnetic body 9 is a cone having an apex angle of 2θ and a radius of the bottom surface of R, and the bottom surface is x, y, xy of the x coordinate system. If the height direction of this conical body is in the plane and is the z direction, in the case of the prior art shown in FIG. 7, the electric wire 11 at the opening fringe of the vertical deflection coil is used.
Since the length l of is the semicircular length at the bottom of this cone, l = 1/2 × 2πR = πR (1)

On the other hand, in the case of the above-mentioned embodiment, since the electric wire 11 passes as shown in FIG. 3, it is inclined by a predetermined angle φ with respect to the xy plane as shown by the alternate long and short dash line in FIG. 4 (a). On the y-axis
The length of the locus of intersection between the plane intersecting the xy plane and the cone is the length of the electric wire 11 at the opening fringe 11b. The cross section of the conical body cut by this plane becomes a substantially semi-elliptical shape when this plane makes a small angle with the bottom surface of the conical body. The peripheral length of this semi-elliptical shape is the length of the opening fringe, but this length is the minimum when the angle φ between the plane and the bottom of the cone is θ (the proof is omitted). , The ellipse resulting from this is that half the length of its major axis is the radius R of the bottom surface of the cone, and half the length of its minor axis is the cross section taken along the xy plane in FIG. 4 (a). It is Rcos θ according to FIG. Therefore, the peripheral length l'of this substantially semi-ellipse is l> l 'when compared with the peripheral length l of at least a semicircle.

Therefore, in the case of a normal 90 ° -deflection or 110-degree deflection color CRT, θ is about 25 ° to 35 °, and the opening fringe length l ′ is 2.99R to 2.86R. It is about 4.8 to 8.9% shorter than the length 1 of the opening fringe in the prior art shown in (1). Therefore, the deflection efficiency P _v is also reduced accordingly.

In the above embodiment, one tongue is used, but two or more tongues may be provided. This makes it possible to more accurately minimize the length of the opening fringe.

〔The invention's effect〕

As described above, according to the present invention, not only is the effect of canceling the deflection magnetic field reduced by arranging the fringes of the opening and the neck of the saddle type deflection coil outside the magnetic body, but Since the length can be minimized, the resistance increase of the deflection coil due to the opening fringe can be suppressed, and the deflection performance can be significantly improved. Further, the deflection coil has a high winding accuracy because the electric wire is positioned and wound by the molded body on the opening side or the neck side, and further by the tongue piece, so that the deflection magnetic field varies. It is possible to provide a high-performance and low-cost deflection yoke that can be significantly reduced, the work of correcting misconvergence can be simplified, and the work of winding can be facilitated.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a deflection yoke according to the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a view schematically showing a winding method of a deflection coil in this embodiment. The figure is a view for explaining the length of the opening fringe of the deflection coil in this embodiment, FIG. 5 is a perspective view showing a conventional saddle type deflection yoke, and FIG. 6 (a) is a conventional molded body. FIG. 7 (b) is a side view of the same, and FIG. 7 is a schematic view showing a winding method of the conventional saddle type deflection coil around the magnetic body. 7: Molded body on the side of the neck, 7a, 7b ... Protrusion,
8: Molded body on the opening side, 8a, 8b ... Protrusion, 9
...... Magnetic material, 10 ...... Tongue, 10a ...... Groove, 11 ...... Saddle type deflection coil wire, 11a ...... Winding part, 11b ...... Opening fringe, 11c ...... Neck part fringe, 12 ... …screen.

Claims (1)

[Claims] 1. A deflection coil is formed into a saddle shape by attaching a molded body having protrusions on the opening side and the neck side of a magnetic body having a trumpet shape extending along the surface of a cathode ray tube. In the deflection yoke, the winding part of which is arranged on the inner surface side of the magnetic body, and the opening fringe and the neck fringe of the deflection coil are arranged on the outer surface side of the magnetic body, respectively. At least one protruding tongue piece is provided between the molded body on the side of the mold and the molded body on the side of the neck, and the opening fringe of the deflection coil is provided at one end of the molded body on the side of the opening. A deflection yoke, wherein the length of the opening fringe can be shortened by passing the projection of the portion through the projection of the other end through the tongue piece.