JP2001319596A - Deflecting yoke and tv receiver with cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a wide angle deflection along with suppressing, as much as possible, an increase of a deflection power. SOLUTION: A deflecting yoke 15 is composed of a horizontal deflection coil 16 that generates a horizontally deflecting magnetic field to deflect an electron beam in the horizontal direction, and a sub deflection coil 21 that is arranged in a position of a rear end of the deflecting yoke and, toward the deflection direction (right or left direction) of the electron beam through the horizontal deflection coil 16, generates a sub deflection magnetic field to deflect the electron beam in a reverse direction of the said deflection direction and also in a reverse direction from a standard axis for deflection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke (DY) for deflecting an electron beam and a cathode ray tube receiver using the same.

[0002]

2. Description of the Related Art In a cathode ray tube receiver such as a television receiver or a computer display, three electron beams emitted from an electron gun, namely, R (red) and G
Images are assembled on the screen (panel surface) of the cathode ray tube by deflecting the traveling directions of the three electron beams for emitting the phosphors of (green) and B (blue) colors up, down, left, and right.
For deflection of the electron beam, a deflection yoke having a horizontal deflection coil and a vertical deflection coil is used. The deflection yoke is mounted on a portion called a cone from the neck of the cathode ray tube to the funnel.

In general, in order to reduce the depth of a cathode ray tube receiver having the same screen size, it is effective to increase the deflection angle of an electron beam by a deflection yoke, that is, to realize so-called wide angle deflection. That is, FIG.
As shown in (B), when the electron beam is deflected at an angle θ1 by the deflection yoke 52 mounted on the cathode ray tube bulb 51 and when the electron beam is deflected at an angle θ2 larger than that, the larger the deflection angle is, The depth dimension can be reduced.

However, when the deflection angle is increased, the deflection power increases accordingly. If the deflection angle is simply increased, the electron beam collides with the inner surface of the cathode ray tube bulb, and a shadow called a neck shadow appears on the display screen. Therefore, when increasing the deflection angle, it is necessary to move the attachment position (deflection center) of the deflection yoke closer to the panel side in consideration of a dimensional allowance (neck shadow allowance) for avoiding neck shadow.

[0005]

However, when the mounting position of the deflection yoke is brought closer to the panel side, the deflection yoke becomes larger (larger diameter) corresponding to the outer diameter of the cathode ray tube bulb.
Therefore, the radial distance from the central axis of the cathode ray tube bulb to the deflection yoke becomes longer. In particular, the outer diameter of the cone portion of the cathode ray tube bulb rapidly increases on the panel side, and accordingly, the outer diameter of the deflection yoke also increases. Then, when a deflection magnetic field is applied to the electron beam, more deflection power (deflection power) is required, and the deflection efficiency is deteriorated. Further, the increase in deflection power due to the wide-angle deflection described above is also added, so that the deflection power is further increased, and the circuit for driving the deflection yoke becomes expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its main object to provide a deflection yoke capable of realizing wide angle deflection while minimizing an increase in deflection power, and a cathode ray tube using the same. An object of the present invention is to provide a receiver.

[0007]

In the deflection yoke according to the present invention, a main deflection coil for generating a main deflection magnetic field for deflecting an electron beam is provided at a rear end side of the deflection yoke. With respect to the direction of deflection of the electron beam by the coil, a configuration including a sub-deflection coil that generates a sub-deflection magnetic field that deflects the electron beam in a direction opposite to the direction of the deflection and opposite to the deflection reference axis is adopted. I have.

In a cathode ray tube receiver according to the present invention, a cathode ray tube bulb and a deflection yoke mounted on the cathode ray tube bulb and having a main deflection coil for generating a main deflection magnetic field for deflecting an electron beam are provided. A sub-deflector provided at a rear end side of the deflection yoke and deflecting the electron beam in a direction opposite to the direction of deflection of the electron beam by the main deflection coil and in a direction opposite to the deflection reference axis. A configuration including a sub-deflection coil for generating a deflection magnetic field is employed.

In the above-described deflection yoke and cathode ray tube receiver, the deflection of the electron beam by the main deflection coil (for example, the horizontal deflection coil or the vertical deflection coil) is performed by the sub deflection magnetic field by the sub deflection coil. By deflecting the electron beam in the opposite direction to the direction opposite to the deflection reference axis and further deflecting the electron beam by the main deflection magnetic field of the main deflection coil, the mounting position of the deflection yoke does not approach the panel side. However, it is possible to increase the neck shadow margin. Further, by appropriately setting the deflection angle of the electron beam by the sub deflection coil in accordance with the cathode ray tubes of various sizes, it becomes possible to use a common deflection yoke for cathode ray tubes of different sizes (screen sizes).

[0010]

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

FIG. 1 is a schematic perspective view showing an overall image of a cathode ray tube according to the present invention. In FIG. 1, a cathode ray tube bulb (cathode ray tube main body) 10 includes a panel section 11, a funnel section 12, and a neck section 13. On the inner surface of the panel section 11, a phosphor screen (not shown) in which red, blue, and green phosphors are arranged in a pattern is formed. On the other hand, an electron gun (gun) serving as an electron beam emission source is provided on the neck portion 13.
14 are furnished. A deflection yoke 15 for deflecting an electron beam is mounted on a cone portion extending from the neck portion 13 to the funnel portion 12. The deflection yoke 15 is mounted and adjusted so that the center axis of the yoke coincides with the center axis of the cathode ray tube bulb 10.

The color cathode-ray tube having the above-described structure includes a panel unit 1
1 Along with various accessories necessary for reproducing a color image (or a black-and-white image) on a phosphor screen on the inner surface, it is incorporated in a casing (not shown) so that a cathode ray tube receiver such as a television receiver or a computer display can be obtained. Is configured.

FIG. 2 is a side view including a partially broken cross section of the deflection yoke according to the embodiment of the present invention. 2, the deflection yoke 15 is equipped with components such as a horizontal deflection coil 16, a vertical deflection coil 17, a separator 18, a core 19, and a ring magnet 20. The horizontal deflection coil 16 is wound in a saddle type (saddle type) on the inner peripheral side of the separator 18.
The vertical deflection coil 18 is wound on the outer peripheral side of the separator 18 in a saddle type (saddle type). The vertical deflection coil 1
8 may be wound around the core 19 in a toroidal form.

The horizontal deflection coils 16 are arranged in pairs above and below the deflection yoke 15 (vertically). The vertical deflection coils 17 are arranged in pairs on the left and right sides (horizontal direction) of the deflection yoke 15. Then, on the trajectory of the electron beam emitted from the electron gun 14, the horizontal deflection coil 16 generates a magnetic field (horizontal deflection magnetic field) for deflecting the electron beam in the left-right direction (horizontal direction) of the screen. A magnetic field (vertical deflection magnetic field) for deflecting the electron beam in the vertical direction (vertical direction) of the screen is generated.

The core 19 is made of a magnetic material such as ferrite and has a cylindrical structure with one opening in the direction of the yoke center axis (Z axis) larger than the other. This core 19
Is mounted so as to cover the deflection coils 16 and 17 in order to further enhance the effectiveness of the magnetic field generated by the horizontal deflection coil 16 and the vertical deflection coil 17. The ring magnet 20 is attached to the rear end of the deflection yoke 15 in order to correct a trajectory shift of the electron beam due to an assembly error of the electron gun 14 or the like.

Further, a sub deflection coil 21 is provided on the rear end side of the deflection yoke 15. The sub-deflection coil 21 is a so-called air-core coil that does not use a magnetic core made of a magnetic material such as ferrite as shown in FIG. 3, and forms a pair above and below the deflection yoke 15 (in the vertical direction) inside the ring magnet 20. It is wound around. The sub-deflection coil 21 is formed by, for example, providing a hook portion (not shown) for winding on a resin-made cylindrical member on which the ring magnet 20 is mounted, and winding the coil wire on the hook portion. I have.

FIG. 4 is a diagram showing a coil connection form according to the embodiment of the present invention. As shown, a pair of horizontal deflection coils 16 are connected in parallel. On the other hand, the pair of sub deflection coils 21 are connected in series, and this series circuit is connected in series to the parallel circuit formed by the pair of horizontal deflection coils 16. By adopting such a coil connection configuration, a sawtooth-shaped horizontal deflection current is supplied to the sub deflection coil 21 during horizontal deflection.

Although the horizontal deflection coil 16 is connected to the sub deflection coil 21 in series to supply a horizontal deflection current to the sub deflection coil 21, the system is different from the horizontal deflection coil 16. A configuration in which a saw-tooth current synchronized with the horizontal deflection cycle is supplied to the sub deflection coil 21 may be adopted. Further, the configuration may be such that the current supplied to the sub deflection coil 21 can be adjusted.

Next, the magnetic field generated by the sub deflection coil 21 during horizontal deflection will be described in detail. In this embodiment, an electron beam (hereinafter, referred to as an electron beam B) for emitting a blue phosphor, an electron beam (hereinafter, an electron beam G) for emitting a green phosphor, and a red phosphor are emitted. An example in which an electron beam to be emitted (hereinafter, electron beam R) is emitted in-line (in a horizontal straight line) from the electron gun 14 will be described. However, the present invention is not limited to this.

First, in the first half of horizontal deflection (a period during which the left side of the screen is horizontally scanned), a pair of horizontal deflection coils 16 generate a downward horizontal deflection magnetic field, whereby the electron beam is directed leftward when viewed from the panel side. Be deflected. At this time, a horizontal deflection current Ih flows through the sub deflection coil 21 in a direction as shown in FIG. Then, the sub deflection coil 2
1 forms an upward sub-deflection magnetic field φ1 on the trajectory of the electron beam Eb. Therefore, the electron beam Eb is deflected rightward when viewed from the panel side, that is, in the direction opposite to the direction of electron beam deflection by the horizontal deflection coil 16. At this time, the trajectory of the electron beam Eb is shifted rightward from the deflection reference axis when viewed from the panel side.

Due to the upward sub-deflection magnetic field φ1 generated by the sub-deflection coil 21, the three electron beams B, G, and R emitted from the electron gun 14 are respectively transmitted from the panel side as shown in FIG. The electron beam is deflected in the opposite direction (right direction) to the direction in which the horizontal deflection coil 16 deflects the electron beam, and in the direction opposite to the deflection reference axis (right side).

Incidentally, the deflection reference axis is the deflection yoke 1
5 without operating (without forming a deflecting magnetic field)
From the three electron beams B, G, and R when the electron beams B, G, and R are emitted, and this is different for each of the electron beams B, G, and R. Here, the horizontal deflection coil 16
Corresponds to the main deflection coil.
Is equivalent to the main deflection magnetic field.

On the other hand, in the latter half of the horizontal deflection (a period in which the right side of the screen is horizontally scanned), a pair of horizontal deflection coils 16 generate an upward horizontal deflection magnetic field, whereby the electron beam is directed rightward when viewed from the panel side. Be deflected. At this time, a horizontal deflection current Ih flows through the sub deflection coil 21 in a direction as shown in FIG. Then, the sub deflection coil 2
1 forms a downward sub-deflection magnetic field φ2 on the trajectory of the electron beam Eb. Therefore, the electron beam Eb is deflected to the left as viewed from the panel side, that is, in the direction opposite to the direction of electron beam deflection by the horizontal deflection coil 16. At this time, the trajectory of the electron beam Eb is shifted leftward from the deflection reference axis when viewed from the panel side.

Due to the downward sub-deflection magnetic field φ2 generated by the sub-deflection coil 21, the three electron beams B, G, and R emitted from the electron gun 14 are respectively transmitted from the panel side as shown in FIG. The electron beam is deflected in the opposite direction (left direction) to the direction of deflection of the electron beam by the horizontal deflection coil 16 (left direction) and on the opposite side (left side) of the deflection reference axis.

As a result, of the three electron beams emitted from the electron gun 14, for example, the electron beam G for emitting a green phosphor emits an orbit as shown in FIG. (Fluorescent screen). That is, the electron beam G heading to the left end of the screen is deflected by the sub-deflection coil 21 by the sub-deflection magnetic field.
s is deflected rightward (as viewed from the panel side) from s.
At this time, since the deflection reference axis for deflecting the electron beam G coincides with the central axis Z of the cathode ray tube bulb 10, the electron beam G is deflected to the right of the central axis Z. Further, in the deflection yoke 15, the electron beam G is deflected leftward (as viewed from the panel side) from the deflection center Pm of the deflection yoke 15 by the horizontal deflection magnetic field of the horizontal deflection coil 16, and reaches the inner surface of the panel section 11.

On the other hand, the electron beam G traveling to the right end of the screen
Is deflected leftward from the deflection center Ps of the sub-deflection coil 21 by the sub-deflection coil 21 and leftward of the deflection reference axis (Z-axis). Further, in the deflection yoke 15, the electron beam G is deflected rightward from the deflection center Pm of the deflection yoke 15 by the horizontal deflection magnetic field of the horizontal deflection coil 16 and reaches the inner surface of the panel section 11.

In a beam scanning period (horizontal scanning period) from the left end to the right end of the screen, the sub deflection coil 2
1 and the intensity of the horizontal deflection magnetic field by the horizontal deflection coil 16 change according to the amplitude of the horizontal deflection current. That is, during the beam scanning period from the left end to the center of the screen (the first half of horizontal deflection), the respective magnetic field strengths gradually decrease, and accordingly, the deflection angle of the electron beam G by the coils 16 and 21 also decreases. . Further, during a period in which the beam is scanned from the center of the screen to the right end (the latter half of the horizontal deflection), the respective magnetic field strengths gradually increase.
The deflection angle of the electron beam G due to 21 also increases. By the way, since the amplitude of the horizontal deflection current becomes zero at the middle point of the horizontal scanning period, no deflection magnetic field is formed by the coils 16 and 21. Therefore, the electron beam G travels straight on the Z axis and moves to the center of the screen. To reach.

The above principle is based on the fact that the electron beam B for emitting the blue phosphor and the electron beam R for emitting the red phosphor are used.
Is also applied to the case where each is horizontally scanned on the screen.

In this way, the sub-deflection coil 21 applies the sub-deflection magnetic field for deflecting the electron beam in the direction opposite to the direction of deflection of the electron beam by the horizontal deflection coil 16 and in the direction opposite to the deflection reference axis. By causing this, the neck shadow can be improved even if the mounting position of the deflection yoke 15 (deflection center Ps) does not approach the panel side.

That is, as shown in FIG. 7, in a state where the electron beam G is located on the deflection reference axis (on the Z axis), the electron beam G is directed toward the left or right end of the screen by the horizontal deflection magnetic field of the horizontal deflection coil 16. When the electron beam G is deflected, the electron beam G collides with the inner surface of the cathode ray tube 10 as shown by a broken line in the figure, and a neck shadow appears.

On the other hand, the electron beam G is deflected by the sub-deflection magnetic field of the sub-deflection coil 21 to the opposite side of the deflection reference axis (opposite to the beam deflection direction by the horizontal deflection coil 16). The electron beam G is directed toward the left end or right end of the screen by the horizontal deflection magnetic field of the horizontal deflection coil 16.
Is deflected, the electron beam G as shown by the solid line in FIG.
Reaches the panel section 11 without colliding with the inner surface of the cathode ray tube bulb 10, so that the neck shadow does not appear.

As a result, when using the cathode ray tube having the same screen size and comparing the case where the sub deflection coil 21 is attached and the case where the sub deflection coil 21 is not attached, the former is retracted from the panel portion 11 of the cathode ray tube bulb 10. The deflection yoke 15 can be attached to the deviated position. As a result, it is possible to reduce the size (smaller diameter) of the deflection yoke 15, increase the magnetic flux density of the horizontal deflection magnetic field, and improve the deflection efficiency. In addition, the size and weight of the deflection yoke 15 can be reduced to reduce weight and cost, and it is also possible to easily avoid positional interference with other components (for example, a circuit board for television). .

FIGS. 8A and 8B are diagrams for comparing the magnetic field distribution of the horizontal deflection magnetic field. 8A and 8B, the vertical axis represents the magnetic flux density, and the horizontal axis represents the position on the central axis (Z axis) of the cathode ray tube bulb. First, FIG. 8A compares the magnetic field distributions of the deflection yokes 15A and 15B having different diameters. A broken line in the figure indicates a magnetic field distribution of the large-diameter deflection yoke 15A, and a dashed line in the figure indicates a small-diameter deflection yoke 15B. 4 shows a magnetic field distribution. On the other hand, FIG. 8B compares the magnetic field distributions when the deflection yokes 15A and 15B having different diameters as described above and the sub-deflection coil 21 are combined with the small-diameter deflection yoke 15B. The magnetic field distribution of the large diameter deflection yoke 15A.
4 shows a magnetic field distribution due to a combination of B and the sub deflection coil 21.

As shown, in the magnetic field distribution of the large diameter deflection yoke 15A, the peak value P1 of the magnetic flux density is lower than that of the small diameter deflection yoke 15B (P2, P3). Further, in the case of the large-diameter deflection yoke 15A, the peak position of the magnetic flux density is closer to the panel side than in the case of the small-diameter deflection yoke 15B. Furthermore, when compared with the deflection yoke 15B having the same small diameter, the peak value of the magnetic flux density has the same level (P2
= P3).

From the above comparison of the magnetic field distributions, for example, when the electron beam is deflected only by the small-diameter deflection yoke 15B, a neck shadow occurs. To avoid this neck shadow, a large-diameter deflection yoke 15A is employed. If the mounting position is moved toward the panel side, the deflection sensitivity is deteriorated due to the decrease in the magnetic flux density. On the other hand, by combining the small-diameter deflection yoke 15B and the sub-deflection coil 21, the magnetic flux density can be increased as compared with the case of using the large-diameter deflection yoke 15A, and the neck shadow can be avoided.

When the sub-deflection coil 21 is used, the deflection angle in the horizontal direction is substantially increased by the deflection of the electron beam by the sub-deflection magnetic field. Can be reduced. In the following, the effect is proved by giving specific examples.

First, the data of the cathode ray tube employed in verifying the effect of the present invention will be shown below. Screen horizontal dimension (screen horizontal dimension): 201.9 mm Screen vertical dimension (screen vertical dimension): 151.1 mm Horizontal radius of panel inner surface: 6000 mm Vertical radius of panel inner surface: infinity Distance from deflection center of deflection yoke to inner surface of panel section: 1
35 mm Deflection angle in the screen horizontal direction: 56.90 ° Deflection angle in the screen vertical direction: 48.22 ° Deflection angle in the screen diagonal direction: 62.44 °

Here, as a general rule, the deflection power of the deflection yoke is expressed by the following equation. LI ² = K · Ddy ² / Ldy · SIN ² θ · HV (1) In equation (1), K: constant, Ddy: deflection yoke diameter (average diameter), Ldy: deflection yoke length (effective length) ), I: deflection current (peak-peak value), L: self-inductance of deflection yoke, θ: deflection half angle, HV: acceleration voltage.

In the above equation (1), the deflection yoke length (L
For dy), the length of the deflection coil in the axial direction was made common to make it constant. However, the diameter of the deflection yoke was changed by changing the mounting position of the deflection yoke in the central axis direction of the cathode ray tube bulb. At this time, when the mounting position of the deflection yoke is changed, the inner volume of the deflection yoke also changes due to the change in the yoke diameter accompanying the change.

First, based on the conventional design method using no sub-deflection coil, the mounting position of the deflection yoke was set so that the neck shadow did not appear. The inner volume of the horizontal deflection coil was 259.6 cc. Was. on the other hand,
When the mounting position of the deflection yoke was set by a design method using a sub deflection coil so that the neck shadow did not appear, the mounting position was 10 m closer to the gun than in the previous case.
m, thereby reducing the internal volume of the horizontal deflection coil to 127.1 cc.

As described above, when the internal volume of the horizontal deflection coil is reduced (substantially halved), the magnetic flux density generated by the horizontal deflection coil increases accordingly. This means that the horizontal deflection coil has an inner volume of 259.6 cc and the deflection efficiency is LI2
= 68.3 mHA ² , the deflection deflection efficiency is LI ² = 36.
This is in agreement with the calculated result of 6 mHA ² . From this, it can be seen that deflecting power is reduced by about 50% by avoiding neck shadow using the sub-deflection coil.

On the other hand, the horizontal deflection angle is increased by the beam deflection by the sub deflection coil. In the cathode ray tube applied in this example, as shown in FIG. 9, the deflection angle of the electron beam deflected by the sub-deflection coil 21 is 11.8 °, and the horizontal deflection coil directs the electron beam toward the left end (or right end) of the screen. When the trajectory of the electron beam to be deflected is adjusted to form 56.2 ° with the Z axis, the substantial deflection angle of horizontal deflection is 56.2 ° + 11.8 ° = 68.0 °.
It became.

Here, when the increase (loss) of the deflection power due to the increase of the deflection angle (+ 11.8 °) is calculated using the above equation (1), (SIN68.0 / SIN56.2) ² ≒
1.24. From this, it is understood that the deflection power is increased by about 24% by the increase of the deflection angle by the sub deflection coil. However, the improvement of the deflection power described above (a reduction of about 50%) makes it possible to reduce the deflection power in total by about 30% and to improve the deflection efficiency accordingly.

By the way, when the mounting position of the sub-deflection coil is moved toward the neck side, the deflection angle of the electron beam by the sub-deflection coil (increase in the deflection angle) becomes smaller, so that the loss of the deflection power is reduced. It is possible to improve the total deflection efficiency.

Further, by using the deflection yoke 15 according to the embodiment of the present invention, different sizes (screen sizes) can be used.
It is also possible to realize the common use of the deflection yoke in the cathode ray tube. That is, in general, in a cathode ray tube having different sizes, as the size increases, three electron beams B, G,
The angle at which R is concentrated (convergence) is reduced. Therefore, as shown in FIG. 10, at the center of deflection of the deflection yoke, the distance d between the electron beams B and R on both sides is widened, and a dimensional margin for avoiding neck shadow, that is, the neck shadow is correspondingly increased. There is less room.

When the size of the cathode ray tube increases,
Since the separation distance between the color selection mechanism (such as the aperture grille) and the inner surface of the panel becomes large, it is necessary to secure a large beam pitch dimension with an electron gun in order to improve the deviation of beam landing due to terrestrial magnetism. As a result, at the deflection center of the deflection yoke, the beam interval d becomes wider and the neck shadow margin decreases. Therefore, at present, in order to secure a desired neck shadow margin with cathode ray tubes of various sizes, a dedicated deflection yoke is designed for each size to cope therewith.

On the other hand, when the deflection yoke 15 according to the embodiment of the present invention is used, the deflection angle of the electron beam by the sub deflection coil 21 is appropriately set in accordance with the cathode ray tubes of various sizes, so that the size is reduced. It is possible to avoid neck shadows by using a common deflection yoke even for different cathode ray tubes. As a result, not only the design of the deflection yoke but also the manufacturing and management thereof can be standardized, so that the cost can be significantly reduced.

Incidentally, the deflection angle of the electron beam by the sub-deflection coil 21 can be arbitrarily adjusted by the number of windings of the sub-deflection coil 21 and the amount of current flowing therethrough. As a means for varying the intensity of the sub-deflection magnetic field by the sub-deflection coil 21, for example, by providing a current supply circuit capable of adjusting the current supplied to the sub-deflection coil 21,
The deflection angle of the electron beam by the sub deflection coil 21 can be easily adjusted.

In the above embodiment, the horizontal deflection coil 16 is used as the main deflection coil, and a pair of upper and lower sub deflection coils 21 are provided corresponding to the main deflection coil. However, the present invention is not limited to this. By using the coil 17 as a main deflection coil and providing a pair of left and right sub-deflection coils corresponding to the main deflection coil, it is possible to improve the deflection efficiency at the time of vertical deflection. In addition, by providing both the sub deflection coil corresponding to the horizontal deflection coil 16 and the sub deflection coil corresponding to the vertical deflection coil 17, it is also possible to improve the deflection efficiency at the time of horizontal and vertical deflection.

In the above-described embodiment, the deflection yoke 15 having the sub deflection coil 21 is employed, and this deflection yoke 15 is mounted on the cathode ray tube bulb 10. However, this is not necessarily the case with the cathode ray tube receiver. However, the present invention is not limited thereto, and the sub-deflection coil 21 may be attached to the cathode ray tube bulb 10 separately from the deflection yoke 15 (as a separate component).

Further, the configuration of the sub deflection coil is as follows.
For example, as shown in FIG. 11, a sub-deflection coil 2 is attached to a protruding portion 22A of a core 22 made of a magnetic material such as ferrite.
3 and the sub-deflection coil 23 generates sub-deflection magnetic fields φ1 and φ2 in the same manner as described above.

[0052]

As described above, according to the present invention, the sub deflection coil is provided at the rear end side of the deflection yoke, and the electron beam generated by the main deflection coil is provided by the sub deflection magnetic field generated by the sub deflection coil. By deflecting the electron beam in the direction opposite to the deflection direction and on the opposite side of the deflection reference axis, it is possible to increase the neck shadow margin even if the mounting position of the deflection yoke does not approach the panel side. Thereby, in realizing wide-angle deflection, an increase in deflection power can be suppressed as much as possible. As a result, it is possible to provide a cathode ray tube receiver having a small depth dimension and excellent deflection efficiency. Also, an inexpensive circuit can be used for driving the deflection yoke. Further, by appropriately setting the deflection angle of the electron beam by the sub-deflection coil in accordance with cathode ray tubes of various sizes, it becomes possible to use a common deflection yoke even for cathode ray tubes of different sizes.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an overall image of a cathode ray tube according to the present invention.

FIG. 2 is a side view including a partially broken cross section of the deflection yoke according to the embodiment of the present invention.

FIG. 3 is a perspective view illustrating a mounting state of a sub deflection coil.

FIG. 4 is a diagram showing a coil connection mode according to the embodiment of the present invention.

FIG. 5 is a diagram (part 1) illustrating a magnetic field generated by a sub deflection coil during horizontal deflection.

FIG. 6 is a diagram (part 2) illustrating a magnetic field generated by a sub deflection coil during horizontal deflection.

FIG. 7 is a diagram illustrating an electron beam trajectory caused by a magnetic field generated by a sub deflection coil.

FIG. 8 is a diagram comparing magnetic field distributions of a horizontal deflection magnetic field.

FIG. 9 is a diagram showing a specific example of an electron beam trajectory by a sub deflection coil.

FIG. 10 is a diagram showing a difference in electron beam trajectory depending on a cathode ray tube size.

FIG. 11 is a diagram showing a modification of the sub deflection coil.

FIG. 12 is a diagram showing a relationship between a deflection angle and a depth dimension.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Cathode ray tube bulb, 11 ... Panel part, 12 ... Funnel part, 13 ... Neck part, 14 ... Electron gun, 15 ... Deflection yoke, 16 ... Horizontal deflection coil, 17 ... Vertical deflection coil,
21, 23 ... sub deflection coil, 22 ... core

Claims (4)

[Claims] A main deflection coil for generating a main deflection magnetic field for deflecting the electron beam; a main deflection coil provided at a rear end side of the deflection yoke; A deflection yoke, comprising: a sub-deflection coil that generates a sub-deflection magnetic field that deflects an electron beam in a direction opposite to a deflection direction and on a side opposite to a deflection reference axis. 2. The deflection yoke according to claim 1, further comprising means for varying the intensity of a sub-deflection magnetic field generated by the sub-deflection coil. 3. A cathode ray tube bulb, a deflection yoke mounted on the cathode ray tube bulb and having a main deflection coil for generating a main deflection magnetic field for deflecting an electron beam, and located at a rear end side of the deflection yoke. And a sub-deflection coil that generates a sub-deflection magnetic field that deflects the electron beam in a direction opposite to the direction of deflection of the electron beam by the main deflection coil and in a direction opposite to the deflection reference axis. A cathode ray tube receiver characterized by comprising: 4. A cathode ray tube receiver according to claim 3, further comprising means for varying the intensity of a sub-deflection magnetic field by said sub-deflection coil.