JPH06139957A - Deflection device - Google Patents

Abstract

PURPOSE:To form a deflection device having the capability of properly correcting the convergence of three electron beams and image distortion. CONSTITUTION:Regarding a deflection device having at least a pair of saddle type coils 21a and 21b, and forming a truncated cone shape with one end as an expanded diameter section 8 and the other end as a small diameter section, constitution is so made that one side of a coil bundle 26a constituting each of the saddle type coils 2a and 21b is superposed on a part of the other side of a coil bundle 26b at the small diameter section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflector, and more particularly to a deflector effective for a self-convergence in-line color picture tube.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 6, a color picture tube has an envelope composed of a panel 1 and a funnel-shaped funnel 2 integrally joined to the panel 1.
On the inner surface of the panel 1, facing the shadow mask 3 formed with a large number of electron beam passage holes arranged inside 1,
A phosphor screen 4 including a three-color phosphor layer that emits blue, green, and red is formed. On the other hand, an electron gun 7 that emits three electron beams 6B, 6G, and 6R is arranged in the neck 5 of the funnel 2. Then, the three electron beams 6B, 6G, and 6R emitted from the electron gun 7 are deflected by the magnetic field generated by the deflecting device 9 mounted outside the boundary between the neck 5 of the funnel 2 and the large diameter portion 8, The phosphor screen 4 is horizontally and vertically scanned to form a structure for displaying a color image.

In such a color picture tube, an electron gun
3 electron beams 6B, 6G, 6R arranged in a row consisting of a center beam and a pair of side beams that pass through 7 on the same horizontal plane.
In-line electron gun that emits
The self-convergence in-line color picture tube that self-focuses the three electron beams 6B, 6G, and 6R arranged in a row as described above is currently used as a color picture tube. Has become the mainstream.

According to this color picture tube, it is possible to concentrate the three electron beams 6B, 6G and 6R on one point on the phosphor screen 4 without requiring any other circuit-like correction means. However, in reality, even if the barrel-type vertical deflection magnetic field is used to adjust the convergence at the upper and lower ends on the screen vertical axis and the pincushion-type horizontal deflection magnetic field is used to adjust the convergence at the left and right ends on the screen horizontal axis, Is difficult to match. Generally, this phenomenon is
It is called the trilemma.

As shown in FIG. 7, this trilemma is caused by the three electron beams 6B, 6 emitted from the in-line type electron gun 7.
When viewed from the screen side, G and 6R are center beam 6G, the left side beam 6B and the right side beam.
6R, the electron beams 6B, 6G, and 6R are deflected to a larger extent by the magnetic field generated by the deflecting device as the distance to the screen becomes longer. Therefore, on the right side of the screen, the blue screen 11B is displayed rather than the red screen 11R. On the left side of the screen, the red screen 11R is larger than the blue screen 11B. At the upper and lower ends on the vertical axis (Y-axis) of the screen, the distance to the screen is longer than in the center of the screen, so the three electron beams 6B, 6G, and 6R are over-concentrated, and are shown by beam spots 12B and 12R. Thus, the side beam 6R is on the left side and the side beam 6B is on the right side.

Regarding such a screen distortion, the vertical lines of the blue screen 11B and the red screen 11R at the left and right ends on the horizontal axis (X axis) of the screen.
The horizontal deviation from the vertical line of X is XH, and the vertical line of blue screen 11B is on the right side of the vertical line of red screen 11R is positive, and the vertical line of blue screen 11B at the upper and lower ends on the vertical axis of the screen is positive. And red screen 11R
Let YH be the horizontal deviation of the vertical line of and the positive is the case where the vertical line of blue screen 11B is on the right side of the vertical line of red screen 11R. The vertical deviation of the horizontal line of the blue screen 11B and the horizontal line of the red screen 11R at the four corners of the screen is PQV, and in the first and third quadrants separated by the horizontal and vertical axes, the blue screen is different from the horizontal line of the red screen 11R. 11
If the horizontal line of B is on the positive side, and in the second and fourth quadrants, the horizontal line of the red screen 11R is on the positive side of the horizontal line of the blue screen 11B, then the trilemma amount Tr is Tr = It is represented by XH-YH + PQV.

This means that YH at the upper and lower ends on the vertical axis of the screen
8B, the barrel-shaped vertical deflection magnetic field 14V is used to widen the distance between the side beams 6B and 6R as indicated by the arrow, and the beam spot is moved to the same as shown in FIG. 8B. As shown by 12B and 12R, it is necessary to prevent over-concentration at the upper and lower ends on the vertical axis of the screen, but in this case, the PQV at the four corners of the screen becomes large and the blue screen 11
The horizontal line of B and the horizontal line of the red screen 11R are largely deviated in the positive vertical direction. Further, in order to correct XH at the left and right ends on the horizontal axis of the screen, as shown in FIG. 9 (a), the pincushion-type horizontal deflection magnetic field 13H is set so that it is largely deflected toward the periphery as shown by the arrow. As shown in (b), the vertical line on the blue screen 11B and the vertical line on the red screen 11R may be narrowed to prevent overconcentration, but in this case as well, the PQV at the four corners of the screen is large. Become. That is, the trilemma amount Tr
PQV becomes positive if YH is changed along the positive direction, and PQV is changed if XH is changed along the negative direction.
Is the positive direction.

As a means for correcting this trilemma, a method of shifting the deflection center of the vertical deflection magnetic field and the deflection center of the horizontal deflection magnetic field in the tube axis direction has been put into practical use. That is, the deflection center is the electron beam 6 incident on the deflection region DZ along the tube axis, as shown in FIG. 10 where the electron beam 6 before being deflected by the deflection magnetic field passes on the tube axis (Z axis). Is gradually bent by the deflection magnetic field to draw a curve, and the deflection area D
The electron beam 6 emitted from Z travels on a straight line. The center of deflection is shown at point 16 which extends that straight line and intersects the tube axis. The trilemma can be set in the positive direction by setting the deflection center of the vertical deflection magnetic field closer to the phosphor screen side than the deflection center of the horizontal deflection magnetic field, and conversely, the deflection center of the vertical deflection magnetic field can be set to the deflection center of the horizontal deflection magnetic field. The negative direction can be obtained by setting the side closer to the electron gun.

The variable range of the deflection center is limited by the power consumption of the deflection device on the phosphor screen side, and on the electron gun side, the deflection beam funnel.
It is limited by the fact that it collides with the inner surface of 2 (generally, the inner surface of the boundary (float) between the neck 5 and the large diameter portion 8 of the funnel 2 where the deflecting device is mounted) and the electron beam does not reach the screen. To be done.

In general, the deflecting device is designed under such a limitation, but recently, the deflecting device is not only convergence-free but also an image which does not require a correction circuit for image distortion. Distortion-free is required.

Of the image distortions, the pincushion distortions on the left and right of the screen are as shown in FIG.
By making V 2 a pincushion type, and pincushion distortion at the top and bottom of the screen can be corrected by making the horizontal deflection magnetic field 14H a pincushion type, as shown in FIG.

Therefore, the magnetic field distribution of the deflecting device satisfying the requirements of convergence-free and image distortion-free is a combination of the convergence-free magnetic field and the image-distortion-free magnetic field distribution. -Pin cushion type distribution and vertical deflection magnetic field are barrel type-pin cushion type distribution. Such a magnetic field distribution is a magnetic field distribution for correcting convergence on the electron gun side, which has a large influence on the convergence, and a magnetic field distribution for correcting image distortion on the phosphor screen side, which has a large influence on the image distortion. It suffices to design the deflection device so that in practice, the magnetic field distribution on the phosphor screen side necessary for image distortion correction is set, and the total magnetic field distribution including the magnetic field distribution on the phosphor screen side is set. Pincushion type or barrel type, which is necessary for convergence correction.

Although a complicated magnetic field distribution has recently been required for the deflecting device, it is necessary to manufacture a deflecting device which actually satisfies the required magnetic field distribution for the recent color picture tube. Has become difficult. That is, as the color picture tube becomes higher definition, larger size, wider angle, flat panel, etc., it becomes difficult to correct image distortion, and the pincushion type magnetic field distribution on the phosphor screen side must be strengthened. ing.

As a result, it is difficult to deal with the vertical deflection magnetic field which requires a pincushion type phosphor screen side and a barrel type magnetic field distribution as a comprehensive magnetic field distribution. Therefore, in a 25-inch or larger 110-degree deflection color picture tube, of the image distortion, only the distortion at the top and bottom of the screen is corrected by the magnetic field distribution of the deflection device, and the distortion at the left and right of the screen is corrected by the circuit of the TV set. There is.

On the other hand, the horizontal deflection magnetic field is difficult to deal with, and if the phosphor screen side that corrects image distortion is a pincushion type and the total magnetic field distribution is a pincushion type that is necessary for convergence correction, the phosphor screen side Pincushion type magnetic field distribution of is too stronger than the magnetic field distribution necessary for image distortion correction, horizontal convergence is negative XH at the horizontal axis end, vertical line of blue screen 11B is left, vertical line of red screen 11R is vertical. The line tends to the right more strongly. In addition, the deviation PQ between the horizontal lines of the blue screen 11B and the red screen 11R at the four corners of the screen PQ
V also tends to be negative.

In response to such a horizontal deflection magnetic field, Japanese Utility Model Laid-Open No. 58-14665 discloses a saturable reactor for changing the impedance of the horizontal deflection coil by magnetically coupling with the leakage magnetic field of the vertical deflection coil in the deflecting device. Is attached to partially correct PQV. However, providing such a saturable reactor complicates the assembly of the deflecting device and causes a cost increase.

[0017]

As described above, the self-convergence in-line type color picture tube is a three-electron beam arranged in a row, which is composed of a center beam and a pair of side beams which are emitted from an electron gun and pass on the same horizontal plane. Can be concentrated on one point on the phosphor screen, but it is difficult to match the convergence on the entire screen, and image distortion occurs in the peripheral portion of the screen. Among these image distortions, the horizontal deviation of the vertical line of the screen at the upper and lower ends on the vertical axis of the screen drawn by the pair of side beams, that is, YH of the trilemma, is the deflection center of the vertical deflection magnetic field and the deflection center of the horizontal deflection magnetic field. Has been put into practical use. The pincushion distortion on the left and right of the screen can be corrected by making the vertical deflection magnetic field into a pincushion type, and the pincushion distortion at the top and bottom of the screen can be corrected by making the horizontal deflection magnetic field a pincushion type.

Therefore, the deflection device satisfying the requirements of convergence-free and image distortion-free is a combination of the magnetic field distribution for correcting convergence and the magnetic field distribution for correcting image distortion, and the horizontal deflection magnetic field with respect to the convergence. Pincushion-pin with the electron gun side, which has a large influence, as the magnetic field distribution for correcting convergence, and the phosphor screen side, which has a large influence with respect to the pincushion type image distortion, as the magnetic field distribution for correcting image distortion A cushion type magnetic field distribution may be used, and a vertical deflection magnetic field may be a barrel type-pin cushion type magnetic field distribution in which the electron gun side is a barrel type.

However, it is difficult to make the magnetic field of the deflection device have such a complicated distribution, and as the color picture tube becomes higher definition, larger size, wider angle and flat panel,
It becomes difficult to correct image distortion, and the pincushion type magnetic field distribution on the phosphor screen side must be strengthened. Therefore, at present, for a 110-degree deflection color picture tube device of 25 inches or more, of the image distortion, only the distortion at the top and bottom of the screen is corrected by the horizontal deflection magnetic field distribution of the deflection device, and the distortion at the left and right of the screen is set on the TV set. Is corrected by the circuit.

On the other hand, the horizontal deflection magnetic field is difficult to deal with, and if the phosphor screen side for correcting image distortion is a pincushion type and the total magnetic field distribution is a pincushion type necessary for convergence correction, the phosphor screen side The pincushion type magnetic field distribution of is too strong than the magnetic field distribution necessary for image distortion correction, the XH of the trilemma becomes negative at the horizontal axis end, and the PQVs at the four corners of the screen tend to become negative.

In response to such a horizontal deflection magnetic field, in Japanese Utility Model Laid-Open No. 58-14665, a saturable reactor for changing the impedance of the horizontal deflection coil by magnetically coupling with the leakage magnetic field of the vertical deflection coil in the deflecting device. Is attached to partially correct PQV. However, the provision of such a saturable reactor complicates assembly of the deflecting device and causes a cost increase.

The present invention has been made in view of the above problems, and it is possible to correct the convergence and the image distortion so as not to affect each other, and to configure a deflecting device capable of displaying a good image. To aim.

[0023]

In a deflection device having at least a pair of saddle type coils and having a truncated cone shape with one end having a large diameter portion and the other end having a small diameter portion, the pair of saddle type coils are The structure is such that the winding bundle on one side extending between one end and the other end of each saddle coil partially overlaps with the winding bundle on the other side on the small diameter side.

[0024]

In general, in the saddle type coil, the winding bundles on one side and on the other side extending between the large diameter portion at one end and the small diameter portion at the other end form the horizontal axis with respect to the central axis of the deflection device. It changes depending on the angle θ. The angle θ formed by the winding bundle with the horizontal axis is the angle that sets the magnetic field center of the winding bundle. In the case of a barrel type magnetic field, θ> 30 °, in the case of a uniform magnetic field, θ = 30 °, and of the pincushion type magnetic field. In this case, θ <30 ° is set. That is, in the saddle type coil, in order to make the magnetic field distribution on the large-diameter side a pincushion shape, the angle θ formed by the winding bundle and the horizontal axis with respect to the central axis of the deflecting device is θ <30 °.
Since the surface area is small on the small diameter side, the arrangement of the winding bundle is restricted, and it is difficult to obtain a desired magnetic field distribution.

However, when the winding bundle on one side partially overlaps the winding bundle on the other side on the small diameter side as in the deflecting device of this example, the magnetic field center setting angle θ of the winding bundle is increased. It is possible to obtain a desired magnetic field distribution. In this case, currents flowing in opposite directions flow in the overlapping portions, so that magnetic fields are magnetically offset and no magnetic field distribution contributing to deflection is generated. Therefore, by constructing the saddle type coil as described above, for example, the magnetic field distribution on the small diameter side is made to be a strong barrel shape, and a sufficient pincushion type magnetic field necessary for image distortion correction is formed on the large diameter side. Also, the total magnetic field distribution can be the magnetic field distribution required for convergence correction.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 1 and FIG. 2 show a deflecting device which is an embodiment thereof. This deflecting device is a semi-toroidal deflecting device, in which a pair of upper and lower saddle type horizontal deflecting coils 21a and 21b are arranged inside a substantially frustoconical mold 20 made of synthetic resin such as propylene, and outside the mold 20. The toroidal vertical deflection coils 24a and 24b in which the coil 23 is wound with the tubular ferrite core 22 as a magnetic core are arranged. The entire deflection device has a truncated cone shape, one end of which has a large diameter part on the phosphor screen 4 side of the color picture tube and the other end of which has a small diameter part on the electron gun 7 side. It is designed to be mounted on the outside of the boundary with the major part 8.

The toroidal vertical deflection coils 24a, 24a
b generates a pincushion type magnetic field on the large diameter side (phosphor screen 4 side) and a barrel type magnetic field on the small diameter side (electron gun 7 side), and the overall magnetic field distribution corrects the convergence properly. It is configured to have a barrel-shaped magnetic field distribution.

On the other hand, a pair of upper and lower saddle type horizontal deflection coils 21a and 21b are respectively provided with a pair of winding bundles 26a extending between the large diameter portion and the small diameter portion along the central axis (Z axis) of the deflecting device.
26b, and the large diameter end and the small diameter end of the winding bundles 26a, 26b on one side and the other side are connected via bend-up portions 27a, 27b, respectively. The magnetic field center setting angle θ of the large-diameter portion of the winding bundles 26a and 26b of the horizontal deflection coils 21a and 21b is set to θ <30 ° on the large-diameter portion side, and the vertical distortion of the screen is completely corrected. Generates a pincushion type magnetic field. Then, as it gets closer to the small-diameter portion from this large-diameter portion, it expands in the vertical direction (Y-axis direction), overlaps about 5 mm before the bend-up portion 27b of the small-diameter portion, and immediately before the bend-up portion 27b of the small-diameter portion. Then θ> 6
It is set to 0 °. A strong barrel-shaped magnetic field is partially generated, but the total magnetic field distribution is configured to be a pincushion-type magnetic field distribution that appropriately corrects the convergence.

The saddle type horizontal deflection coil 21a,
As shown in FIG. 3A, the bend-up portion 27b of the small-diameter portion of 21b is different from the bend-up portion 27c of the small-diameter portion of the conventional normal saddle-type horizontal deflection coil 21c shown in FIG. 3B. It has a unique shape. Since the bend-up portion 27b does not contribute to the deflection as described later, it does not matter even if it has such a shape.

By the way, when the saddle type horizontal deflection coils 21a and 21b are constructed as described above, even if a sufficient pincushion type magnetic field necessary for image distortion correction is formed on the large-diameter side,
The magnetic field distribution on the small diameter side can be made into a strong barrel shape,
The total magnetic field distribution can be the magnetic field distribution required for convergence correction. As a result, it is possible to provide a deflecting device that favorably corrects convergence and image distortion.

That is, generally, in the saddle type coil, a pair of winding bundles (bundling bundles on one side and the other side) extending between the large diameter portion and the small diameter portion are horizontal with respect to the central axis of the deflecting device. The angle θ with the axis, that is, the intersection of the central axis of the deflecting device and the XY plane including the horizontal and vertical axes is O, as shown in FIG. 4, and this XY plane and the large-diameter portion of the saddle coil are set. , Where C and D are the intersections between the pair of windings 29a and 29b between the small diameter portions, the straight lines OC and OD change depending on the angle θ with the horizontal axis. The angle θ formed by the windings 29a and 29b with the horizontal axis is the angle that sets the magnetic field center of the windings 29a and 29b. In the case of barrel type magnetic field, θ> 30 °, and in the case of uniform magnetic field, θ = 30.
In the case of a pincushion type magnetic field, θ <30 ° is set.

The actual saddle type coil has windings 29a and 29b.
As described above, the wire bundle is composed of a plurality of wires instead of a single wire. This winding bundle is composed of one continuous wire, and has a shape that can be mounted close to the outside of the boundary between the funnel neck and the large diameter portion of the color picture tube so that efficient deflection can be obtained. Composed. In this case, the magnetic field center setting angle θ of the winding bundle is an angle formed by the straight line connecting the intersection O of the central axis of the deflection device and the XY plane and the center of each winding bundle with the horizontal axis.

In such a saddle type coil, in order to make the magnetic field distribution on the large-diameter side a pincushion type, on the large-diameter side, the center of the winding bundle 26 is θ with respect to the central axis of the deflecting device. The distribution is <30 °. In this case, when the winding bundle having this distribution is guided to the small-diameter portion, the surface area of the small-diameter portion side becomes small, so that it becomes difficult to maintain the distribution of the windings on the large-diameter portion side. Therefore, conventionally, the distribution of the windings on the small-diameter portion side is set as shown in FIGS.

That is, as shown in FIG. 5A, the upper portions of the winding bundles 26c and 26d are set so as to be parallel to the joint 31 of the winding bundles 26c and 26d. According to this structure, the magnetic field center setting angle θ increases on the small diameter side having a small surface area, and the winding bundle can generate a barrel-shaped magnetic field. Further, as shown in FIG. 5B, the pair of winding bundles 26c and 26d are densely arranged as they approach the small-diameter portion, and are set so as to concentrate in the small-diameter portion. With such a configuration, it is possible to obtain a winding distribution that generates a stronger barrel-shaped magnetic field than in the case of FIG. Also in FIG.
As shown in (c), each of the winding bundles 26c and 26d is divided into two, and a part of the winding bundles 26c and 26d is divided into two portions as in the winding bundle shown in FIG. 5 (a).
32d is set such that the upper part of these partial winding bundles is parallel to the seam 31 of the winding bundles 26c and 26d, and the other portion 33c
, 33d are arranged densely as they approach the small-diameter portion like the winding bundle shown in FIG. 5B, and are set so as to concentrate in the small-diameter portion. With this configuration, the winding bundles 26c, 26c
Part of the winding bundle parallel to the seam 31 of d is a winding distribution that generates a pincushion type magnetic field, and the other portion of the winding bundle that concentrates in the small diameter part has a winding distribution that generates a barrel type magnetic field. The generated magnetic field can be adjusted by the winding bundle of the other part.

In contrast to the conventional winding distribution on the small diameter side, the magnetic field center setting angle is set to θ <30 ° on the large diameter side as in the saddle type horizontal deflection coils 21a and 21b of this example. When the set pair of winding bundles 26a and 26b overlap each other before the small diameter portion, the magnetic field center setting angle immediately before the bend-up portion 27b of the small diameter portion can be increased to θ> 60 °. . On the other hand, since currents in opposite directions flow in the overlapped portions, they are magnetically offset and no magnetic field distribution contributing to deflection is generated.

Therefore, by constructing the saddle type horizontal deflection coils 21a and 21b as described above, the magnetic field distribution on the small diameter side can be made to be a strong barrel shape, which is necessary for correcting the image distortion on the large diameter side. Even if a sufficient pincushion type magnetic field is formed, the total magnetic field distribution can be the magnetic field distribution required for convergence correction.

Such a saddle type horizontal deflection coil 21a,
As a result of applying 21b to the deflecting device of the 34-inch 110-degree deflecting color picture tube, the PQV of the conventional trilemma is negative and is -0.
7mm, XH is negative -0.5mm and vertical distortion is 2%, but PQV is positive + 0.3mm, XH is positive + 0.6mm
The vertical strain was able to be 1.7%.

Incidentally, such a saddle type horizontal deflection coil
21a and 21b can be obtained by press-molding a coil wound into a predetermined shape with a metal mold, but by making a guide pin or groove in the mold and making a direct winding, the section winding method is used. , A more ideal coil is obtained.

In the above embodiment, the semi-toroidal type deflection device has been described. However, the present invention provides a horizontal deflection coil and a vertical deflection coil of a saddle-saddle type deflection device in which both horizontal and vertical deflection coils are saddle type. Can also be applied.

Further, in the above embodiment, the saddle type deflection coil provided with the bend up portion has been described, but the present invention can be applied to the saddle type deflection coil having no bend up portion.

[0042]

As described above, the winding bundle of one side extending between the large-diameter portion and the small-diameter portion of the saddle type coil of the deflection device having the truncated cone shape is partially overlapped with the winding bundle of the other side portion on the small-diameter portion side. If the structure overlaps, the magnetic field center setting angle of the winding bundle on the large diameter portion side is made small, and even if a pincushion type magnetic field is generated, the magnetic field center setting angle on the small diameter portion side is made large, The magnetic field distribution can be made into a strong barrel shape, and even if a sufficient pincushion type magnetic field necessary for image distortion correction is formed on the large-diameter side, the comprehensive magnetic field distribution is the same as the magnetic field distribution necessary for convergence correction. Therefore, it is possible to provide a deflecting device that favorably corrects convergence and image distortion.

[Brief description of drawings]

FIG. 1 (a) is a front view of a semi-toroidal deflection device according to an embodiment of the present invention, and FIG. 1 (b) is an end view showing the small diameter side thereof.

FIG. 2 is a diagram showing a state in which the deflection device is mounted on a color picture tube.

FIG. 3 (a) is a view showing a structure of a bend-up portion of a small-diameter portion of a saddle-type horizontal deflection coil of the deflection device, FIG.
(B) is a diagram showing a structure of a bend-up portion of a small diameter portion of a conventional ordinary saddle type horizontal deflection coil shown for comparison.

FIG. 4A and FIG. 4B are views for explaining a magnetic field center setting angle of a winding bundle of a saddle type deflection coil.

5A to 5C are views for explaining the structure of a winding bundle of a small diameter portion of a conventional saddle type deflection coil.

FIG. 6 is a diagram showing a configuration of a color picture tube.

FIG. 7 is a diagram for explaining image distortion of a self-convergence in-line type color picture tube device.

8A is an explanatory view of a vertical deflection magnetic field for correcting YH of the upper and lower trilemmas on the vertical axis of the screen of the self-convergence inline type color picture tube device; FIG.
(B) is a diagram for explaining the PQV of the trilemma at the four corners of the screen, which occurs when YH of the trilemma above and below the vertical axis of the screen is corrected.

9 (a) is an explanatory view of a horizontal deflection magnetic field for correcting XH of the left and right trilemmas on the horizontal axis of the screen of the self-convergence in-line type color picture tube device, FIG.
(B) is a diagram for explaining the PQVs of the trilemmas at the four corners of the screen, which occur when the XH of the left and right trilemmas on the horizontal axis of the screen are corrected.

FIG. 10 is a diagram for explaining a trajectory of an electron beam deflected by a deflection magnetic field.

11A is an explanatory diagram of a vertical deflection magnetic field that corrects pincushion distortion on the left and right sides of the screen, and FIG. 11B is an explanatory diagram of a horizontal deflection magnetic field that corrects pincushion distortion on the upper and lower sides of the screen.

[Explanation of symbols]

 2… Funnel 4… Phosphor screen 5… Neck 8… Large part 20… Mold 21a, 21b… Saddle type horizontal deflection coil 22… Core 23… Coil 24a, 24b… Toroidal type vertical deflection coil 26a, 26b… Winding bundle 27a , 27b… Bend Ab

Claims (1)

[Claims] 1. A deflection device having at least a pair of saddle type coils and having a truncated cone shape with one end having a large diameter portion and the other end having a small diameter portion, wherein the pair of saddle type coils are each saddle type coil. A deflection device, wherein a winding bundle on one side extending between one end and the other end partially overlaps with a winding bundle on the other side on the small diameter side.