JPH10241601A - Deflection yoke and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a gull wing pattern without affecting vertical line misconvergence and realize a deflection yoke of high performance and low cost. SOLUTION: Permanent magnets 4 (4a to 4d) are disposed such that an angle, which is subtended by a line segment OY that is parallel to the sub-scanning direction and crosses a tube axis O with a line segment OA, that connects the enter of a line segment BC connecting two poles of each of the permanent magnets 4 with the tube axis O, becomes θ1. Further more, the permanent magnets 4 are disposed such that the line segment BC connecting the two poles thereof makes a right angle with the line segment OA connecting the center of this line segment BC with the tube axis O. Although it is desirable that the angle θ1 be 30 degrees with respect for an improvement effect of gull wing pattern, when an attachment angle of the permanent magnets 4 is 30 degrees or less, mutually neighboring permanent magnets interfere with each other, whereby a vertical line misconvergence is affected, and therefore the attaching angle which satisfies two points, the improvement of the gull wing pattern and the effects on the vertical line miconvergence is more than 30 degrees and less then 40 degrees.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke used in a color cathode ray tube device and a color cathode ray tube device and a display device using the deflection yoke. The invention relates to a deflection yoke with means.

[0002]

2. Description of the Related Art A deflection yoke provided with means for improving a gull wing pattern, which is a deflection distortion in the upper and lower portions of a screen caused by a local change in a horizontal deflection magnetic field, is described in, for example, Japanese Patent Publication No. 7-44016. There is something.

The deflection yoke described in this publication has four magnetic poles at an angle of about 20 to 30 degrees from the Y axis on the large diameter side of the deflection yoke, and tangentially to the deflection yoke opening. Is arranged. In other words, in the upper part on the large diameter side of the deflection yoke, two magnets are respectively arranged around the Y axis.
At a position at an angle of about 20 to 30 degrees from the axis, each magnet is arranged so as to be clockwise from the north pole to the south pole when viewed from the large diameter side of the deflection yoke.

Similarly, in the lower part on the large diameter side of the deflection yoke, two magnets are respectively located at angles of about 20 to 30 degrees from the Y axis around the Y axis, and each magnet is , Clockwise from the north pole when viewed from the large diameter side of the deflection yoke.
It is arranged to be a pole.

The lines of magnetic force generated from each of these four permanent magnets cause the red, green, and blue beams to receive a deflecting force, thereby improving the gull wing pattern, which is the deflection distortion at the top and bottom of the screen. Things.

[0006]

However, in the deflection yoke described in Japanese Patent Publication No. 7-44016, the angle of the deflection yoke is about 20 to 30 degrees from the Y axis on the large diameter side of the deflection yoke. Since the respective magnets are arranged at the positions, and the distance between the adjacent magnets is short, the lines of magnetic force interfere with each other, affecting the vertical line misconvergence, and there is a possibility that the image quality is reduced.

That is, lines of magnetic force are generated from the N pole of one of the adjacent magnets to the S pole of the other magnet,
The lines of magnetic force cause the red and blue beams to be deflected in the direction outside the deflection yoke, thereby affecting the vertical line misconvergence and possibly deteriorating the image quality.

SUMMARY OF THE INVENTION An object of the present invention is to improve the gull wing pattern which is a deflection distortion at the upper and lower portions of a screen caused by a local change of a horizontal deflection magnetic field without affecting the vertical line misconvergence. The cost is to realize a deflection yoke.

[0009]

[Means for Solving the Problems]

(1) In order to achieve the above object, the present invention is configured as follows. That is, in a deflection yoke which is provided with a horizontal deflection coil, a vertical deflection coil and a core and which is attached to a color cathode ray tube, two permanent magnets are respectively installed above and below the horizontal deflection coil, and each of the permanent magnets is parallel to the sub-scanning direction. When a line segment that intersects with the tube axis is a first line segment, and a line segment that connects the center of the line connecting both poles of each permanent magnet and the tube axis is a second line segment, The angle between the line segment and the second line segment is in the range of more than 30 degrees and less than 40 degrees, and the angle between the line segment connecting both poles of the permanent magnet and the second line segment is 90 degrees. The deflection yoke is arranged on the deflection yoke in a range from the arrangement state of degrees to the arrangement state in which the angle formed by the line connecting both poles of the permanent magnet and the first line is 90 degrees.

The angle formed between the first line segment and the second line segment is
From the arrangement state in which the angle between the line segment connecting both poles of the permanent magnet and the second line segment is 90 degrees while being in the range of more than 30 degrees and less than 40 degrees, the line segment connecting both poles of the permanent magnet is 1
In this arrangement, the angle between the line segment and the line segment is 90 degrees, the gull wing pattern, which is the deflection distortion of the upper and lower portions, can be improved, and the influence on the vertical line misconvergence is suppressed.

(2) Preferably, in the above (1),
Part or all of the permanent magnets are located on the opening side fringe of the horizontal deflection coil or on the tube surface side of the opening side fringe.

(3) Preferably, in the above (1) or (2), the line connecting both poles of the permanent magnet is substantially orthogonal to the second line.

(4) Preferably, in the above (1) or (2), the line connecting both poles of the permanent magnet is substantially orthogonal to the first line.

(5) In a deflection yoke provided with a horizontal deflection coil, a vertical deflection coil and a core and attached to a color cathode ray tube, a permanent magnet in which at least two permanent magnets are formed close to each other to form a set. , Two sets of permanent magnets are mounted above and below the horizontal deflection coil, respectively, and each of the one set of permanent magnets has a first segment that is parallel to the sub-scanning direction and intersects with the tube axis. A line connecting the center of the line connecting both ends of the pair of permanent magnets to the above-mentioned tube axis is a second line.
When the angle between the first line segment and the second line segment is in a range of more than 30 degrees and less than 40 degrees, a line segment connecting both ends of the set of permanent magnets From the arrangement state in which the angle between the first line segment and the second line segment is 90 degrees,
The magnets are arranged on the deflection yoke in a range until the angle between the line segment connecting both ends of the pair of permanent magnets and the first line segment becomes 90 degrees.

The angle between the first line segment and the second line segment is
From the arrangement state in which the angle between the line segment connecting both ends of the permanent magnet and the second line segment is 90 degrees while being in the range of more than 30 degrees and less than 40 degrees, the line segment connecting both ends of the permanent magnet is 1
In this arrangement, the angle between the line segment and the line segment is 90 degrees, the gull wing pattern of vertical deflection distortion can be improved, and the influence on vertical line misconvergence is suppressed.

(6) The color cathode ray tube device further comprises the deflection yoke according to (1), (2), (3), (4) or (5).

It is possible to realize a color cathode ray tube in which the gull wing pattern of vertical deflection distortion can be improved and the influence on vertical line misconvergence is suppressed.

(7) In the display device,
The color cathode ray tube device of the above (6) is provided.

It is possible to improve a gull wing pattern of vertical deflection distortion and to realize a display device in which the influence on vertical line misconvergence is suppressed.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. 1 to 5 are views showing a first embodiment of the present invention. FIG. 1 shows a first embodiment of the present invention.
FIG. 2 is a perspective view showing a positional relationship among a horizontal deflection coil 1, a vertical deflection coil 2, a permanent magnet 4 (4a to 4d), and a core 3 of a deflection yoke 5 according to the embodiment of the present invention. Horizontal deflection coil 1 used for deflection yoke 5 according to the embodiment
FIG. 5 is a schematic front view showing a positional relationship between the magnets and permanent magnets 4a to 4d.

FIG. 3 is a schematic diagram showing the mounting angle of the permanent magnet 4 used in the deflection yoke 5 according to the first embodiment of the present invention. FIG. 4 is a diagram showing the effect of the permanent magnet 4 used in the deflection yoke 5 according to the first embodiment of the present invention. FIG. 5 shows the first embodiment of the present invention.
6 is a graph showing the effect of improving the gull wing pattern with respect to the mounting angle of the permanent magnet 4.

As shown in FIG. 1, on the outer peripheral side of the opening side fringe of the horizontal deflection coil 1, on the opening side fringe of the horizontal deflection coil 1, or on the tube side from the opening side fringe,
Permanent magnets 4a, 4b, 4c, and 4d are provided. A saddle-shaped vertical deflection coil 2 is provided outside the horizontal deflection coil 1, and a core 3 is attached so as to cover the vertical deflection coil 2.

The permanent magnets 4a, 4b, 4c, 4d provided on the outer peripheral side of the opening side fringe of the horizontal deflection coil 1 are arranged as shown in FIG. And these permanent magnets 4
a to 4d are, as shown in FIG. 3, parallel to the sub-scanning direction (Y-axis direction) and the tube axis O (the axis extending in the direction perpendicular to the paper surface)
Is a line segment OY (first line segment), and a line segment connecting the center of the line segment BC connecting both poles of the permanent magnets 4a to 4d and the tube axis O is a line segment OA (second line segment). ), The angle formed by the line segment OY and the line segment OA is θ1. Further, the permanent magnets 4a to 4d are arranged such that a line segment BC connecting both poles of the permanent magnets 4a to 4d and a line segment OA connecting the center of the line segment BC and the tube axis O are orthogonal to each other.

As shown in FIG. 5, the attachment angle θ1 of the permanent magnets 4a to 4d is preferably 30 degrees in order to maximize the effect of improving the gull wing pattern. However, since two permanent magnets are respectively provided above and below the opening side fringe of the horizontal deflection coil 1, the permanent magnets 4
When the mounting angle of a to 4d is 30 degrees or less, the adjacent permanent magnets interfere with each other as described above,
This affects vertical convergence on the axis.

Therefore, the permanent magnets 4a to 4 can simultaneously satisfy the two points of the above-described improvement of the gull wing pattern and the influence on the vertical misalignment on the axis.
The mounting angle of d is in the range of more than 30 degrees and less than 40 degrees (if the mounting angle is 40 degrees or more, the effect of improving the gull wing pattern cannot be expected much).

As described above, two permanent magnets 4 are respectively provided above and below the opening-side fringe of the horizontal deflection coil 1.
a, 4b, 4c, and 4d are angles formed by a line connecting the center of the line connecting both poles of each permanent magnet and the tube axis, and a line parallel to the sub-scanning direction and crossing the tube axis. A range of more than 30 degrees and less than 40 degrees is maintained, and a line connecting both poles of each permanent magnet is arranged to be orthogonal to a line connecting the center of the line and the tube axis. Thereby, as shown in FIG. 4, each of the permanent magnets 4a, 4b, 4c, and 4d generates magnetic force lines (N pole → S pole) as shown by arrows, and the green electron beam (G) is A deflection force is applied in the direction. The green electron beam (G) can be lowered in the middle portion of the screen by the above-described deflection force, so that the gull wing pattern of the vertical deflection distortion can be improved and the influence on the vertical line misconvergence can be suppressed. it can.

Further, since it is sufficient to adjust only the arrangement positions and directions of the permanent magnets 4a to 4d, the gull wing pattern can be improved and the influence on vertical line misconvergence can be suppressed at low cost.

Therefore, according to the first embodiment of the present invention, the gull wing pattern, which is the deflection distortion at the top and bottom of the screen caused by the local change of the horizontal deflection magnetic field, is improved without affecting the vertical line misconvergence. In addition, a high-performance and low-cost deflection yoke can be realized.

FIGS. 6 and 7 are views showing a second embodiment of the present invention. FIG. 6 shows a horizontal deflection coil 1 and a permanent magnet 4 used in a deflection yoke 5 according to a second embodiment of the present invention.
It is a schematic front view which shows the positional relationship with a-4d. Also,
FIG. 7 is a schematic diagram showing the mounting angles of the permanent magnets 4a to 4d used in the deflection yoke 5 according to the second embodiment of the present invention. In FIGS. 6 and 7, parts that are the same as the first embodiment are given the same reference numerals, and descriptions thereof are omitted.

In FIG. 6, similar to the first embodiment,
In the deflection yoke 5 composed of the horizontal deflection coil 1, the vertical deflection coil 2 and the core 3, permanent magnets 4a, 4b, 4c and 4d are arranged outside the opening side fringe of the horizontal deflection coil 1. And the permanent magnets 4a, 4b, 4c, 4d
As shown in FIG. 7, while the line segment OA passes through the center of the line segment connecting the respective poles of the permanent magnets 4 a to 4 d,
The line connecting the poles is parallel to the main scanning direction (the line connecting the poles is orthogonal to the line OY in the sub-scanning direction), and the angle θ1 is more than 30 degrees and less than 40 degrees. Is arranged to keep.

As described above, when the angle θ1 exceeds 30 degrees and
The range of less than 0 degree is maintained, and the permanent magnets 4a, 4b, 4
By making the line segment BC connecting the poles c and 4d parallel to the main scanning direction, the same effect as in the first embodiment can be obtained.

Therefore, in the second embodiment, similarly to the first embodiment, the deflection distortion of the upper and lower portions of the screen caused by the local change of the horizontal deflection magnetic field without affecting the vertical line misconvergence. Gull wing pattern can be improved, and a high-performance and low-cost deflection yoke can be realized.

FIG. 8 shows a horizontal deflection coil 1 and permanent magnets 4a to 4d used in a deflection yoke 5 according to a third embodiment of the present invention.
It is a schematic front view which shows the positional relationship with 4d. In the third embodiment, the permanent magnets 4a to 4d are two permanent magnets ((4a1, 4a2), (4b1, 4
b2), (4c1, 4c2), (4d1, 4d2)). Other configurations are the same as those in the example of FIG.

That is, the permanent magnets 4a, 4b, 4c, 4d
Indicates that the line segment OA passes through the center of the line segment connecting both ends of the permanent magnets 4a to 4d, the line segment connecting the both ends is parallel to the main scanning direction, and the angle θ1 is 30 degrees. And a range of less than 40 degrees. In the third embodiment, the same effect as in the second embodiment can be obtained.

In the third embodiment described above, in the example of FIG. 6, each of the permanent magnets 4a to 4d is
Although this is an example in which two permanent magnets are used, the same effect can be obtained even if each of the permanent magnets 4a to 4d is configured by two permanent magnets in the first embodiment shown in FIG. Obtainable.

Further, each of the permanent magnets 4a to 4d
It can also be composed of three or more permanent magnets.

Further, in the above-described first to third embodiments, each of the permanent magnets 4a to 4d has a configuration in which a line connecting both poles is orthogonal to the line OA or parallel to the main scanning direction. Although it is an example, from the state where the line connecting both poles of the permanent magnets 4a to 4d is orthogonal to the line OA, the line connecting the two poles is perpendicular to the line OY in the sub-scanning direction. Of the angles described above.

FIG. 9 is a partially cutaway side view showing a color cathode ray tube 6 using the deflection yoke 5 of the present invention. The deflection yoke 5 according to the first to third embodiments of the present invention described above.
Is used for the color cathode ray tube 6, a color cathode ray tube capable of improving the gull wing pattern which is the deflection distortion of the upper and lower portions of the screen caused by the local change of the horizontal deflection magnetic field without affecting the vertical line misconvergence is realized. be able to.

FIG. 10 is a schematic view of a display device using the color cathode ray tube according to the present invention shown in FIG.
The deflection yoke 5 according to the embodiment of the present invention, which includes the above-described horizontal deflection coil 1, vertical deflection coil 2, core 3, and permanent magnets 4a, 4b, 4c, and 4d, as shown in FIG. Provided at an appropriate position outside the tube 6,
It is attached to a display device composed of a high voltage circuit 7, a video circuit 8, a horizontal deflection circuit 9, and a vertical deflection circuit 10.

When the deflection yoke 5 according to the first to third embodiments of the present invention is used for a display device, a screen generated by a local change of the horizontal deflection magnetic field without affecting the vertical line misconvergence. A display device capable of improving the gull wing pattern as the upper and lower deflection distortion can be realized.

[0041]

Since the present invention is configured as described above, the following effects can be obtained. In a deflection yoke which is attached to a color cathode ray tube and has a horizontal deflection coil, a vertical deflection coil and a core, two permanent magnets respectively attached above and below the opening side fringe of the horizontal deflection coil are parallel to the sub-scanning direction. And a line segment intersecting the tube axis is defined as a first line segment, and a line segment connecting the center of the line connecting both poles of each permanent magnet and the tube axis is defined as a second line segment. The angle between the line segment and the second line segment is in the range of more than 30 degrees and less than 40 degrees, and the angle between the line segment connecting both poles of the permanent magnet and the second line segment is 90 degrees. The magnets are arranged in a range from a certain arrangement state to an arrangement state in which the angle formed by the line segment connecting both poles of the permanent magnet and the first line segment is 90 degrees.

Therefore, the deflecting yoke, which is the deflection distortion of the upper and lower portions of the screen caused by the local change of the horizontal deflection magnetic field, is improved without affecting the vertical line misconvergence, and is a high-performance and low-cost deflection yoke. Can be realized.

Further, if the deflection yoke is provided in a color cathode ray tube or a display device, gull wings, which are deflection distortions of the upper and lower portions of the screen caused by local changes in the horizontal deflection magnetic field without affecting vertical line misconvergence. By improving the pattern, a high-performance color cathode ray tube and display device can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a positional relationship among a horizontal deflection coil, a vertical deflection coil, a core, and a permanent magnet of a deflection yoke according to a first embodiment of the present invention.

FIG. 2 is a front view showing a positional relationship between a horizontal deflection coil and a permanent magnet used in the deflection yoke according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram showing an attachment angle of a permanent magnet used in a deflection yoke according to the first embodiment of the present invention.

FIG. 4 is a front view illustrating a positional relationship between a horizontal deflection coil and a permanent magnet used in a deflection yoke according to the first and second embodiments of the present invention.

FIG. 5 is a graph showing the effect of improving the gull wing pattern with respect to the mounting angle of the permanent magnet used in the deflection yoke according to the first embodiment of the present invention.

FIG. 6 is a front view showing a positional relationship between a horizontal deflection coil and a permanent magnet used in a deflection yoke according to a second embodiment of the present invention.

FIG. 7 is a schematic view showing an attachment angle of a permanent magnet used in a deflection yoke according to a second embodiment of the present invention.

FIG. 8 is a front view showing a positional relationship between a horizontal deflection coil and a permanent magnet used in a deflection yoke according to a third embodiment of the present invention.

FIG. 9 is a side view of a color cathode ray tube to which the deflection yoke according to the present invention is attached.

10 is a diagram showing a schematic configuration of a display device using the color cathode ray tube shown in FIG.

[Explanation of symbols]

 Reference Signs List 1 horizontal deflection coil 2 vertical deflection coil 3 core 4 (4a, 4b, 4c, 4d) permanent magnet 5 deflection yoke 6 color cathode ray tube 7 high voltage circuit 8 video circuit 9 horizontal deflection circuit 10 vertical deflection circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Souichi Sakurai 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref. Multimedia System Development Division, Hitachi, Ltd. (72) Inventor Takanori Hisada Yoshida, Totsuka-ku, Yokohama, Kanagawa No. 292, Hitachi, Ltd.Multimedia System Development Division, Hitachi, Ltd. (72) Inventor Yoshio Sato 3300, Hayano, Mobara-shi, Chiba Pref., Electronic Device Division, Hitachi, Ltd. (72) Inventor, Masao Ohara Majo, Mizusawa-shi, Iwate 1 Kitano Hitachi Media Electronics Co., Ltd.

Claims (7)

[Claims] 1. A deflection yoke having a horizontal deflection coil, a vertical deflection coil, and a core, wherein two permanent magnets are respectively mounted above and below the horizontal deflection coil in a sub-scanning direction. When a line segment that is parallel to and intersects with the tube axis is defined as a first line segment, and a line segment that connects the center of the line segment connecting both poles of each permanent magnet and the tube axis is defined as a second line segment, An angle between the first line segment and the second line segment is in a range of more than 30 degrees and less than 40 degrees, and a line segment connecting both poles of the permanent magnet and the second line segment is formed. From the arrangement state where the angle is 90 degrees, the angle between the line connecting the poles of the permanent magnet and the first line is 90 degrees.
A deflection yoke which is arranged on the deflection yoke within a range until the deflection yoke is in a certain arrangement state. 2. A deflection yoke according to claim 1, wherein a part or all of said permanent magnet is located on an opening side fringe of said horizontal deflection coil or on a tube surface side of said opening side fringe. . 3. The deflection yoke according to claim 1, wherein a line segment connecting both poles of the permanent magnet and the second line segment are substantially orthogonal to each other. 4. A deflection yoke according to claim 1, wherein a line segment connecting both poles of said permanent magnet and said first line segment are substantially orthogonal to each other. 5. A deflection yoke having a horizontal deflection coil, a vertical deflection coil, and a core, the deflection yoke being attached to a color cathode ray tube, wherein at least two permanent magnets are formed in close proximity to each other to form a pair. 2 above and below the deflection coil
Each of the pair of permanent magnets is a line segment connecting both ends of each of the pair of permanent magnets, the first line segment being a line segment parallel to the sub-scanning direction and intersecting with the tube axis. When a line segment connecting the center and the pipe axis is a second line segment, the angle formed by the first line segment and the second line segment is more than 30 degrees and less than 40 degrees. The angle between the line segment connecting both ends of the set of permanent magnets and the second line segment is 9
It is arranged on the deflection yoke in a range from an arrangement state of 0 degrees to an arrangement state in which an angle between a line connecting both ends of the set of permanent magnets and the first line is 90 degrees. A deflection yoke. 6. A color cathode ray tube device comprising the deflection yoke according to claim 1, 2, 3, 4, or 5. 7. A display device comprising the color cathode ray tube device according to claim 6.