JPS5821772B2 - deflection yoke - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deflection yoke, particularly a deflection coil for a color cathode ray tube which requires high definition.

Recently, the advent of high-definition color cathode ray tubes, which have approximately twice the number of scanning lines (1125) as compared to the broadcast television system, and the development of multicolor character display tubes used as terminals for electronic stirring machines. With the advent of these devices, the deflection performance required for the deflection yokes used in these devices has become even more demanding.

In particular, the convergence error (misconvergence) that occurs on the same side of the screen is 20 to 30 inches (equivalent to a maximum of 0.5 mm), which is the value that occurs in ordinary broadcast television picture tubes.
The value is required.

In order to realize such misconvergence characteristics, 1.
This improves the geometrical winding accuracy of the deflection yoke, eliminates the asymmetry of the magnetic field distribution within the deflection and the non-uniformity of characteristics between the same type of deflection yokes, and improves the winding distribution of the deflection yoke. It is necessary to select an appropriate value, and then use it to adjust the uncorrected concentration error pattern formed by the three deflected electron beams to one that is easier to apply dynamic concentration correction to.

A deflection yoke used in a commercially available color television receiver using a shadow mask type color cathode ray tube is:
Horizontal.

A double-saddle type deflection yoke with vertical coils each having an I-saddle type, a saddle-toroidal type deflection yoke with one horizontal coil of the saddle type, and one vertical coil of the toroidal type, and a double-saddle type deflection yoke with one horizontal and vertical coil each having a toroidal type. There are three types of type deflection yokes.

Among the coils constituting these deflection yokes, a schematic diagram of the winding form of the saddle-shaped coil of the double-saddle-type deflection yoke, which has advantages such as high deflection efficiency and rapid attenuation of the end magnetic field in one direction in the longitudinal direction of the yoke, is shown below. Figure 1a and bt are shown.

The winding form consists of a convex die 1, a concave die 2, and a press die 3. Figure a is an assembly diagram of the winding die when the convex die 1 is viewed from the side, and the horizontal plane AA' shown by the two-dot chain line is parallel to the press reference plane. The line BB' indicated by a dashed line indicates the central axis of the winding form.

Figure A is Figure A (here, the plane AA includes the central axis BB')
'l This shows a perpendicular cross section.

In the winding operation, the conductive wire 5 stretched through a pulley 4 placed on the extension of the press reference plane AA' is sequentially wound from the inner edges 6, 6' of the winding body to the reference plane AA' side.

There are two winding methods. One is to fix the pulley 4 at a fixed position and rotate the entire winding form around its central axis BB' to wind the conductor 5. Another method is to fix the entire winding form at a fixed position, and then rotate the pulley 4 with the conducting wire 5 around the central axis BB' of the winding form to wind the conducting wire 5. .

In either of these winding methods, the conductor is wound once.

When winding the wire, the conductor 5 first slides down the winding guide 7 of the convex type 1, then slides up the guide 8 of the concave type 2, slides down the guide 9 of the convex type 1 again, and finally slides down the guide 9 of the concave type 2. It is rolled up by sliding up 10.

At this time, the winding density of the wound wire bodies 11° and 11' varies due to various factors described below.

That is, (1) the tension acting on the conductor 51; (2) the sliding friction resistance between the conductor 5 and the guides 7, 8, 9, and 10;
Factors such as ■ the temperature of the conducting wire 5 or the winding forms 1 and 2, ■ the rotational speed of the full winding form or the pulley 4, and ■ the twisted state of the wire bundle when the conducting wire 5 is wound as multiple wires act. b
Since the force acting on the left half winding body 11 wound in one coil and the force acting on the right half winding body 11'+ are not constant, the force acting on the winding body 11 and 11' Density (causes a difference)

Furthermore, the winding density is not constant inside the left half of the winding body 11, that is, between the inner edge 6 side of the winding body and the press reference plane AA' side.

The same goes for the right half.

FIGS. 2a and 2b are enlarged sectional views of the winding body portion of FIG. 1 b7.

Figure a shows the state when all the windings have been completed.

The winding density of the left winding body 11 is relatively coarsely wound, and at the end of the winding it winds up relatively above the reference plane AA', whereas the right winding body 11' is wound relatively densely. An example is shown in which the amount of winding up from the reference surface A8' is relatively small.

After the winding is completed (the winding body is electrically heated (1), the adhesive coating the surface of the conductor is melted, and the next winding body (1) is heated.
1.11' is press-molded using the press die 3 up to the press reference surface AA', and then the electricity is turned off to cool and solidify the fusing agent.

The state of the winding body after press molding is shown in FIG.

The winding body 11 on the left half of the figure is dense (
It is curved, and the inner edge 6 side is roughly curved.

This is thought to be because the coil surface is curved in an arc shape, and the press pressure penetrates into the inside (inner edge 6 side).

On the other hand, since the right half was wound relatively densely from the beginning, the density remains almost uniform even after one press.

FIG. 3 shows a cross section perpendicular to the coil axis 1 when two sets of coils having the above-mentioned asymmetric winding densities are combined and used as a horizontal coil, for example.

A general single-saddle type deflection yoke is used by attaching a core that is substantially conical in the long axis direction of the horizontal and vertical coils, but drawings and descriptions of the core will be omitted below.

In FIG. 3, a winding body 13 constituting the upper end coil half
The winding body 14, which constitutes the lower half of the coil, has a relatively uniform winding density, whereas the winding body 13', which constitutes the upper half of the coil, constitutes the lower half of the coil. Winding body 1
4' means that the winding density on the side near the X axis is dense.

The state of the lines of magnetic force at this time is shown by a dotted line 15.

Now, if the densities of the windings 13, 13' and 14, 14' are all uniform, the magnetic field distribution distributed by 1 on the X-axis is 4th.
As shown by the solid line in the figure, the distribution is symmetrical, but in the case of an asymmetric winding density distribution as shown in Figure 3, the magnetic field distribution is large in the positive region of the X-axis and negative, as shown by the dotted line in Figure 4. It shows an asymmetric magnetic field distribution that seems to be small in the region.

Figure 4 Z1. Z2.・・・・・・The magnetic field distribution of Zn is the 6 values of Z when one Z axis is selected as the center axis in the longitudinal direction of the coil.
This shows the distribution within the cross section.

If a coil exhibiting such an asymmetric/symmetrical magnetic field distribution is applied, for example, one horizontal coil, asymmetrical convergence characteristics will be exhibited between the left and right sides of the screen.

Furthermore, if the asymmetric magnetic field distributions of the vertical coils formed by coils like this overlap, areas that exhibit particularly large misconvergence will appear at the corners of the screen.

Further, the winding distribution of a typical deflection yoke uses a cosine distribution or an approximate distribution thereof.

When this deflection yoke is applied to a color cathode ray tube with an equilateral triangular electron gun arrangement, this screen is shown in Figure 5 a1.
When convergence is performed on the horizontal H axis and vertical y axis on the screen, the misconvergence occurs from the diagonal position to the vertical diagonal middle position VD+ from the horizontal line 1 of the crosshatch pattern at the top and bottom edges of the screen. was occurring.

This misconvergence 1 pattern is red R beam and green G
If the beam convergence correction is applied even more strongly, a sinusoidal pattern as shown in FIG.

As described above, with the conventional deflection yoke, large misconvergence occurs in some corners of the screen, and
It is extremely difficult to observe the deflection yoke of cathode ray tubes, which require high definition, used as terminal equipment for computers, etc.
In devices that require this multi-color display, it is difficult to display the same image across all two colors.

The present invention was completed after studying various problems as described above, and includes high deflection efficiency of the double saddle type deflection yoke and rapid attenuation characteristics of the end magnetic S field in one direction along the long axis of the yoke. In addition to maintaining the characteristics, the geometric accuracy and uniformity of the I-wound body are improved.1 This reduces variations in magnetic field distribution and other electrical performance errors, and eliminates the problem of screen corner areas, which was a problem in the past. It is an object of the present invention to provide a deflection yoke that reduces the amount of misconvergence and is easy to observe.

The present invention will be described below with reference to the drawings and embodiments.

Figures 6a and 6b show two embodiments of the deflection yoke of the invention, showing a horizontal or vertical coil in cross section.

Such a deflection coil is made by dividing the coil shown in Fig. 2a and bl into two or three pieces, and calculating the average arc length per winding body (in Fig. 2b, the winding body 11 The convex circular arc 12 has an end at the inner edge 6 and the reference plane AA'.
It is obtained by shortening the average arc length between the length of the concave arc 12' and the length of the concave arc 12', winding the wires with separate winding dies, and press-molding the wires.

Figure 6a shows an example where half the coil is wound in two parts.
Outer windings 16 and 16' and inner windings 17 and 1
It is composed of 7'1.

The figure shows an example in which the winding is divided into three parts, and is composed of outer winding bodies 18 and 18', middle winding bodies 19 and 19', and inner winding bodies 20 and 20'.

In FIGS. 6a and 6b, the outer end surface 160, 160' of the outer winding body 16.16' or 18.18' or the outer winding body 18.
0, 180' and the outer winding body 16, 16' or 18
．． The line that intersects with the rearmost end surface of the rear end circular arc portion 21 of 18' is the X-axis 1, and the line passing through the center axis 0 of the horizontal or vertical coil and perpendicular to the X-axis is the y-axis.

By winding the coil in two or three parts, the following various advantages arise.

First, if the average arc length becomes shorter, the winding of the winding body will no longer be asymmetrical as shown in Figure 2a, and even if there is a slight asymmetry in the winding, if the average arc length is short, then During molding, the press pressure permeates to the inside, resulting in a nearly uniform winding density, reducing asymmetrical convergence characteristics.

Furthermore, in a normal one-segment winding coil, the wire diameter or the number of wire bundles constituting the winding body is constant throughout the number of turns, so the magnetic field distribution generated by the coil is almost uniquely determined by the shape of the winding form.

On the other hand, in a split-wound coil, it is easy to wind each winding body by changing the wire diameter or the number of wire bundles.

For example, in the two-split coil 1 shown in FIG.
By reducing the wire diameter or the number of wire bundles of the outer windings 16 and 16' (by increasing the number of turns, if both the inner and outer windings are wound with a constant wire diameter or number of wire bundles) Compared to the above, the ampere-turn distribution of the outer winding body is increased and the magnetic field distribution of the bin cushion distortion tendency can be rubbed.

This divisional winding has the advantage that even if the shape of the winding form is constant, the magnetic field distribution can be easily controlled by changing the turn ratio between the winding bodies.

FIG. 7 is a side view of an embodiment of the present invention with two-part winding, and is a diagram showing a half of the coil of the winding body projected onto the yz plane.

The circular arc portions bent in an arc shape, that is, the circular arc portion 21 at the rear end of the outer winding body 16 and the circular arc portion 22 at the front end of the outer winding body 16, are also formed with the connecting portion 161. The circular arc portion 23 at the rear end and the circular arc portion 241 at the front end of the winding body 17 are respectively disposed on the outside in the axial direction (Z direction).

This is because when making coils with various winding impedances by changing the number of turns, conductor method, number of conductor wire bundles, etc. using the same winding type, the shape of these arcuate parts changes depending on the size of the impedance, so it is necessary to shift them back and forth. 1.
This allows the impedance to be changed relatively freely.

However, when the winding form is used with one type of impedance fixed, the shape of the circular arc part is constant, so either one of the rear end circular parts 21 and 23 or the front end circular parts 22 and 24 is used. Same - Z position, or both same -
It is possible to rub Z position 1.

By the way, in general, the main deflection magnetic field Hr distributed on the deflection plane including the center axis of the deflection yoke is given by Hr=H6+H2r2+H4r'+...- for the distance r1 in the deflection direction.

Here, H8, H2, H4... are respectively called the 0th order, 2nd order, 4th order, and distortion coefficient of the magnetic field.

It is something that can be done.

Figure 8 shows a conventional 9-inch wire whose winding distribution has an approximate cosine distribution.
4 of the main side magnetic field in the D direction in one 0° saddle type deflection yoke
This figure shows an example of measurement of an order distortion coefficient and a fourth order component.

In FIG. 1, a curve 25 shows the axial distribution of the fourth-order distortion coefficient H4, and a curve 26 shows the fourth-order component H4 on the deflection trajectory when the electron beam is deflected toward the screen corner D.
At r', it is shown that the axial distribution has a positive value.

Note that the dotted line in the figure indicates the relative position of the deflection yoke.

. In the main deflection magnetic field distributed in the D direction or VD direction 1
If this positive fourth-order component H4r' is included, this positive four-dimensional component H4r' is included.
Since sinusoidal misconvergence occurs due to the 4th order component, it is necessary to reduce the 4th order component of the magnetic field to zero or a negative value in order to eliminate this.

Figure 9 a = h is an explanatory diagram of the magnetic field distortion coefficient in the infinite cylindrical deflection yoke I, and figures a and b show the measurement directions of the horizontal coil and vertical coil, and figures c ''-e and figure 9 fh indicates the distribution of distortion coefficients of the magnetic fields generated by the horizontal coil and vertical coil 1.

E-W, NE-8W, NNE-SSW and N-8, N
E-8W and NNE-8SW are the measurement positions for one horizontal coil and one vertical coil, and each coil is set at θ.

direction (measured while rotating).

As can be seen from c = h in the same figure, when the coil position is 1 angle within the range of 18 degrees to 54 degrees measured from the E-W position, the horizontal coil is in the NE-8W direction. The positive 4th order component is the most noticeable, with the vertical coil NNE-8S
The positive fourth-order component is the largest in the direction of W.

Therefore, in Fig. 6a, when θ is the angle from the X-axis of the position of the conductor constituting the winding body, the number of turns per unit angle of the winding is 1 in the range of 18 degrees to 54 degrees. That is, if the angular density of the winding is reduced, the positive fourth-order component of the magnetic field will be reduced.

Here, this winding angular density reduction range is symmetrical with respect to the X-axis and the y-axis in FIGS.
The following description will be made representative of the angle range within the quadrant.

In the horizontal coil (here, if the winding angular density in the entire range or a part of the winding angle is reduced, in the D direction, the positive fourth order of the main deflection magnetic field In the vertical coil 1, if the winding angular density of the entire range or a part of the winding angle is reduced, the positive fourth-order component of the main deflection magnetic field in the VD direction decreases. do.

The present invention is horizontal. For each vertical coil, the dividing point of each coil is determined so as to reduce the winding angular density within the above-mentioned coil angle range, resulting in a second feature.

FIG. 10 shows a cross section of the upper half of a two-split horizontal coil according to another embodiment of the present invention. Any three cross sections Z-Z1. It is a diagram in which Z2°Z3 is projected onto the xy plane.

In FIG. 10, outer edges 27, 2 of outer winding 16 are shown.
7' and 27'' can be positioned on the horizontal symmetry plane between the upper and lower coil halves, that is, the xz plane,
Further, in order to insert the coil positioning rib attached to the coil support frame, it is possible to provide a slight gap between the outer edges 27, 27', 27'' and the xz plane.

1. Inner edges 28, 28', 28" of the outer winding body 16
The cut edges of the outer edges 29, 29', and 29'' of the inner winding body 17 are parallel to the xz plane, respectively.

These shapes are intended to facilitate press forming after winding, processing of the coil support frame, assembly of the winding body to the coil support frame, etc.

The dividing plane 31 includes the midpoint of the cut width of the inner edges 28, 2B', 28'' of the outer winding body 16, and the middle point of the cut width of the outer edges 29° 29', 29'' of the inner winding body 17. A dividing plane 32 including the point, and a dividing plane 33 including the midpoint of the width of the cut of the inner edge 30, 30', 30'' of the inner winding body (yz plane (parallel))
is divided into one piece so as to include the center axis 0 of the winding body,
The angles formed by the dividing planes 31, 32, 33 and the xz plane are respectively θ0. θ2. Let it be θ3.

Here, in any cross section 1 other than the cross section at the above three points, the midpoint of the cut at the dividing point is the dividing plane 31.3.
Assume that there is one above 2,33.

At this time, it is desirable that the dividing angles θ and θ2 be within the range of 18 degrees to 54 degrees, which is the range of decreasing winding angular density, and especially if the winding angular density in the middle region of this range is reduced by 1, , has the greatest effect of reducing the positive fourth-order component of the main deflection magnetic field in the above direction.

In this example, θ1-33°. θ2-37°, θ3 near 0
°I chose one.

FIG. 11 shows a cross section of the upper half of a two-split vertical coil according to another embodiment of the present invention.

When FIG. 7 is a vertical coil, the rear end of the inner winding body 17, that is, the front side surface of the rear arc portion 23 is included.

Let ZG of the plane be Z, let Zs be the Z of the plane including the front end of the inner winding body 17, that is, the rear side surface of the front arc portion 24, and let Z2 be an arbitrary value of Z between ZG and Zs.

In FIG. 11, Z is zQ, z2. It is a diagram in which a cross section perpendicular to the Z axis at zs+ is projected onto the xy plane.

No. 11 (here one inner edge 34.34', 34" of outer winding 16 and outer edge 36.34" of inner winding 17).
The cuts 36' and 36'' are both parallel to the xz plane, and the other inner edges 35 and 35' of the outer winding 16.

35'' has a cut parallel to the yz plane.

this. Similar to the horizontal coil, these shapes facilitate processing of the coil support frame and assembly of the winding body to the coil support frame.

FIG. 11 (herein, one inner edge 3 of the outer winding 16
4. 34', 34" and other inner edges 35, 35'.

35", the dividing plane 39 including the respective intersection points 38.38', 3B" and the outer edge 36°36' of the inner winding 17,
The dividing plane 40 including the midpoint of the width of the cut 36' and the inner edges 37, 37' of the inner winding 17.

The dividing plane 41 including the midpoint of the cut of 37" is yz
The lines of intersection made by each plane and the xz plane 1 are parallel to the coil center axis and are divided into 1 sections so that they are in the positive region of y.

That is, the vertical line drawn from the intersection 38.38", the midpoint of the cut on the outer edge 36.36' and the midpoint of the cut on the inner edge 37, 3.7", and the horizontal line parallel to the y-axis. The angles formed with and are respectively θ1G.

θ181θ2G) θ2s and θsGtθ38, the space between these angles is θIG>θ, s, θ2G>θ2S
, 03G>038.

And the angle θIGjθ1s related to the dividing planes 39 and 40
.

It is desirable that both θ1G and θ2s be within the range of 18 degrees to 54 degrees, which is the winding angular density decreasing range, and if the winding angular density in the middle region of this range is reduced to zero, The effect of reducing the positive fourth-order component of the main deflection magnetic field is greatest.

Angle θ1 on the front side (screen side) with respect to the dividing plane 39
The reason why it is chosen to be smaller than G is to increase the rate at which the winding angular density in the screen side region increases toward the inner edge.

The reason why the angles θ2G, θ2s and θ3G, θ5s (7) are chosen to be small on the screen side is similar to the above.

From this, it is possible to provide a strong bottle cushion distortion in the main deflection magnetic field distribution in the {circle around (1)} direction.

The main deflection magnetic field in the H direction has a relatively weak bottle cushion strain, and the main deflection magnetic field in the ■ direction is relative (has a strong bottle cushion strain).Thus, the main deflection magnetic field in the D direction is relatively (This creates a uniform magnetic field, which improves convergence characteristics at diagonal positions and triangularity distortion of beam running.

In this example, θ, G=36.5°, θ18=28°,
One of θ2G=40° and θ2s=31° was selected, and the angle on the front side (screen side) was made smaller by 8.5° to 9° than the angle on the rear side (electron gun side).

Also, θ3G=38° and θ38=66° are selected.

As mentioned above, there is one dividing point of the two-split coil I for the horizontal coil on the plane that includes the coil center axis 0, and that for the vertical coil is a straight line that is parallel to the coil axis 0 and passes through the positive region on the y-axis. As explained above, the magnetic field distribution of the horizontal coil has a degree of freedom in selecting either a weak bottle cushion tendency or a weak barrel tendency. It is also possible to choose to lie on a plane containing a straight line passing through the positive or negative region of .

Figures 12a and 12b are diagrams for explaining an embodiment of a two-split coil, in which figure a shows a horizontal coil, figure 12 shows a vertical coil, and either the outer winding body or the inner winding body is used. FIG.

The horizontal coil has an arc centered on the coil axis 0 and limits the inner surface of the winding body with a radius R1, x=0, y == Yf, a circular arc centered on the coil axis 0 and limits the outer surface of the winding body with a radius R2, the X axis an outer edge parallel to the x-axis at a distance T from the x-axis, an inner edge parallel to the x-axis and a distance H from the x-axis, and an inner edge parallel to the y-axis and a distance D/2 from the y-axis. It is made up of one inner edge with one position.

In the vertical coil, the radius of the arc defining the outer surface of the winding body is R1.
sIt is the same as the horizontal coil except that the radius of the circular arc that limits the inner surface is R2.

The table shows the above 6 values at one boundary between the circular arc part and the conical part in the front and back, and the above 6 values when Z is changed by 10 mm by selecting Z=01 as the end position of the horizontal coil arc part.

In the table, D is omitted because the inner edge of the horizontal outer winding is determined only by H and R1, and H is omitted because the inner edge of the horizontal inner winding and vertical inner winding is determined only by D and R1. .

Figure 13 shows the outer winding body 49 and the inner winding body 5 of the horizontal coil.
0, and the outer winding body 51 and the inner winding body 5 of the vertical coil.
Z=20 when 2 is assembled with 531 coil support frames,
50 and 67.5 mmt cross sections are shown superimposed.

The coil support frame 53 is perpendicular to the central axis of the coil, and the horizontal line AA'
It has a structure in which it is divided into two parts, one upper and one lower, by a plane including the upper and lower parts, and is provided with ribs 54, 55, 56 degrees 57 for setting the respective winding body positions.

As explained in the above embodiments, the angle between the X2 plane and the dividing plane of the winding body should be selected between 18° and 54°. The coil can reduce the positive fourth-order component generated in the main deflection magnetic field in the VD force direction, thereby reducing the amount of misconvergence at the corners of the screen, making it possible to obtain a screen that is easy to observe.

Next, the first divided coil according to the present invention will be explained.

The three-divided coil shown in FIG. 6 consists of a middle winding body, 19.
By relatively reducing the winding angular density of 19' by I, the same effect as in the case of a two-split coil can be obtained.

Regarding the arrangement of the windings in the longitudinal direction of the 3-split coil, the same concept as when each of the horizontal and vertical coils is a 2-split coil can be applied.

Therefore, the following is one cross section of the winding body for one 3-divided coil! I will only explain the tricks.

The horizontal coil of the three-split coil is further widened by one inch within the range of 18° to 54° between the dividing planes 31 and 32 shown in FIG. Line body 1
It has a structure containing 9.

In the case of a vertical coil, the dividing plane 39. shown in FIG.
40° becomes wider within the range of 18° to 54°,
It has a structure in which the middle winding body 19 shown in FIG. 5B is placed in this space.

In Figure 14, the coil cross section has a center 0] and a radius R.
A winding in which the inner surface of the winding body is defined by a circle of 1, the center is located at a position 1 x 1 x 1 Y in the vertical direction from the center 0, and the outer surface of the winding body is defined by a circle with a radius of R2. This shows an example of line distribution.

Here, the values of X and Y are one in the vicinity of the center 0, and zero and positive and negative values are not particularly limited.

Now, in FIG. 14, if the circle defining the outer surface 47 of the middle winding body 42 is part of the approximate cosine distribution, then
Even if the single cell is divided into three parts, sinusoidal misconvergence is likely to occur.

The three-split coil according to the present invention includes, for example, the middle coil 42
Replace the radius of the arc that limits the inner surface of the middle coil from R1 with Rli, or change the radius R of the arc that limits the outer surface of the middle coil.
It is constructed by replacing 481 circular arcs with radius R2' with the center right in X and Y.

That is, it can be constructed by selecting R1'>R1 or R2'<R21 and relatively decreasing the winding angular density of the middle winding body by 1.

This method is just one example, and in general, the center coordinates X and Y of the circular arc 48 may be changed by any one value as long as one value is selected to reduce the winding angular density.

Next, the outer edge 44 and inner edge 45 of the middle winding body 42
Let θ1 and θ2 be the angles formed by the straight line connecting to the coil center axis 0 with the X axis, respectively, and θ1 and θ2 are selected so that there is one angle within the range of 18° to 54°.The inner edge of the outer winding body 43
and the outer edge 44 of the middle winding body 42, and between the inner edge 45 of the middle winding body 42 and the outer edge 46 of the inner winding body, a thin gap where no winding is present is provided, respectively. When, θ
1-18°.

In the case of θ2-54°, the influence on the fourth-order component of the magnetic field is so small that it can be ignored, but when 01 is 18
If o2 is smaller than 54°, the fourth-order component of one magnetic field will have an effect similar to the effect of the gap in the case of two divisions.

However, since there is no middle point between 18° and 54° between θ and θ2, this effect is smaller than in the case of two divisions.

As in the above embodiment, the coil divided into three parts has a reduced winding angular density of the middle winding body 42 and one gap between the dividing points, so that the main deflection in one part in the D direction compared to the horizontal coil I Sinusoidal misconvergence can be reduced by reducing the positive fourth-order component of the magnetic field, or for the vertical coil, the positive fourth-order component of the main deflection magnetic field in one direction in the VD direction.

In addition, the 3-split coil has a shorter average arc length of the cross section perpendicular to the coil axis of the winding body of one set of split coils than the 2-split coil, so the winding can be formed easily and uniformly. It is easy to produce a winding body with a high winding density and a uniform shape, and it has the advantage of reducing the variation error in misconvergence characteristics, that is, it is optimal for high-precision cathode ray tubes.

Above, we have explained the cases in which both the horizontal coil and the vertical coil are 1-2-divided windings and 3-divided windings; either the horizontal coil or the vertical coil is
Then, it is possible to rub the other side with 2 divided turns or 3 divided turns, and it is also possible to rub one of the horizontal coils or vertical coils with 2 divided turns and the other with 2 divided turns and 1 turn. be.

, 'Furthermore, each of the above embodiments (in this case, a saddle-type deflection yoke of a color cathode ray tube was described, but the deflection yoke of the present invention can also be used for a deflection yoke of an image pickup tube, etc.). Also suitable for semi-toroidal type deflection yokes whose only part is saddle type.

It can be used.

As is clear from the above description, in the deflection yoke of the present invention, half of the winding body of the horizontal coil or vertical coil is formed of a divided body of an outer winding body and an inner winding body, and The front end arc and rear end circle of the winding body.

The angle between the plane including the outer edge of both connecting parts connecting the arc part and the dividing plane including the inner edge of either of these connecting parts and the central axis of the horizontal coil or vertical coil is 18 degrees to 54 degrees. This is within the range of

In a deflection yoke with this structure, the winding body is divided and wound,
Because each can be press-formed, the windings are well aligned, and compared to a conventional saddle-type deflection yoke, the variation error in misconvergence can be reduced to about 6% + that of a conventional saddle-type deflection yoke. can be reduced.

Then, the coil is divided into 1 parts, and the angle between the plane including the dividing point and the central axis and the plane including the outer end surface of the connecting part is 1.
Since it is within the range of 8 degrees to 54 degrees, the amount of sinusoidal misconvergence is 2 times that of a conventional saddle type deflection yoke.
It is possible to reduce this by 0 to 30%, and it is possible to obtain highly uniform and high quality convergence characteristics.

Therefore, the deflection yoke of the present invention eliminates distortion of displayed characters and misalignment of multicolored character display, especially in high-definition color cathode ray tubes, multicolor character display cathode ray tubes, and television cathode ray tubes 1. This makes it easier to observe.

[Brief explanation of drawings]

Figures 1a and b are views showing the winding form of the saddle-type deflection coil, Figures 2a and b are partially enlarged views of the winding body of the winding form, Figure 3 is a cross-sectional view of the deflection coil, and Figure 4. Fig. 5a is a magnetic field distribution diagram when the winding density is asymmetric. b is an explanatory diagram of misconvergence in a color television reception screen], FIGS. 6a and b are cross-sectional views showing each embodiment of the deflection yoke for a color cathode ray tube according to the present invention 1, and FIG. A side view of such a two-split coil, Figure 8 is an explanatory diagram of the strain components of the magnetic field contained in a conventional saddle-type deflection yoke, and Figures 9a-h are diagrams for measuring the distortion coefficient of the magnetic field in the infinite cylindrical yoke. , FIG. 10 is an explanatory diagram of a two-split coil according to the present invention, FIG. 11 is a cross-sectional view of another embodiment of the present invention, and FIGS. Explanation diagram of dividing points of two-divided coil, 1st
FIG. 4 is an explanatory diagram of the winding distribution of the three-split coil according to the present invention. 16.16', 18,18'...outer winding body,
17゜17.20,20'・・・Inner winding body, 1
9, 19'... Middle winding body, 21 to 24...
...Circular arc, 31°32...Divided surface, 160
．． 160', 180°180'...outer end surface.

Claims (1)

[Scope of Claims] 1. A half of the winding body of a saddle-shaped horizontal coil or vertical coil is formed of a divided body of an outer winding body and an inner winding body, and the front end of the outer winding body A plane including the outer edges of both connecting portions connecting the circular arc portion and the rear end circular arc portion, and an axis parallel to the inner edge of one of the connecting portions and one central axis of the horizontal coil or the vertical coil. A deflection yoke characterized in that the angle formed with the dividing surface is within the range of 18 degrees to 54 degrees. 2. Half of the winding body of the horizontal coil or vertical coil is formed from a divided body of an outer winding body, an inner winding body, and a middle winding body that is sandwiched between the outer winding body and the inner winding body 1. and an axis parallel to a plane including the outer edges of both the connecting portions of the outer winding body, the outer edge and inner edge of the middle winding body, and the central axis of the horizontal coil or the vertical coil. Claim 1: 1. The deflection yoke according to claim 1, wherein each angle formed with the two dividing planes is within a range of 18 degrees to 54 degrees. 3. The deflection yoke according to claim 2, wherein the winding angular density of the middle winding body is lower than the winding angular density of the outer winding body and the inner winding body.