JPH09283048A - Picture tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture tube device of small fv characteristic by generating an axial deviation correcting magnetic field in a constitution relatively simple and useful in a cost. SOLUTION: In a picture tube device having a picture tube built in with an in-line type electron gun and a deflecting yoke of self convergence type mounted in this picture tube, a pair of U-shaped cores 13, 14 are symmetrically arranged in an electron gun side and part of the deflecting yoke, an axial deviation correcting coil 18, 22 is wound astride respective both leg parts 13a, 13b, 14a, 14b of a pair of the U-shaped cores 13, 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a picture tube apparatus having a picture tube having an in-line type electron gun built therein and a self-convergence type deflection yoke mounted on the picture tube, and more specifically, to a picture tube apparatus. The present invention relates to a correction coil arranged in the.

[0002]

2. Description of the Related Art Generally, a color picture tube containing an in-line type electron gun is equipped with a deflection yoke of a self-convergence type. The deflection yoke is distorted in a pincushion-like horizontal deflection magnetic field and in a barrel shape. Generate a vertical deflection field.

If there is an axial misalignment in the left-right direction between the vertical deflection magnetic field and the color picture tube, the misconvergence of the pattern as shown in FIGS. 4 (a) and 4 (b) (hereinafter abbreviated as "axial misalignment"). Do) happen. This occurs because the blue and red horizontal lines B and R projected in the upper and lower parts of the screen 1 are displaced from each other, resulting in a decrease in color purity. Where the blue and red horizontal lines B,
R is the electron beam on both sides of the three electron beams emitted from the in-line type electron gun.

The above misalignment misalignment is shown in FIG.
This can be corrected by introducing the correction means as shown in (b). That is, a pair of E-shaped cores 2 and 3 are symmetrically arranged above and below the end of the deflection yoke Y on the electron gun side.
The vertical deflection current is shunted to the axis deviation correction coils 4 and 5 wound around the legs 2a and 3a of each center of FIG. 3, and the quadrupole magnetic field shown in FIG. , And by the subsequent half-cycle component, FIG.
The quadrupole magnetic fields shown in are generated respectively. By doing so, the vertical force Fb on the electron beams b and r on both sides,
Fr acts to correct misalignment of axis misalignment.

One of the E-shaped cores 2 has vertical isotropic astigmatism correction coils 6a and 6b and vertical coma aberration correction coils 7a and 7b wound around the legs on both sides, respectively, and the other of the legs is wound on the other side. The E-shaped core 3 also has vertical isotropic astigmatism correction coils 8a and 8b and vertical coma aberration correction coils 9a and 9b wound around the legs on both sides thereof.

[0006] Vertical isotropic astigmatism causes misconvergence of the pattern shown in FIG. 6, which is caused by the vertical isotropic astigmatism correction coil 6 as shown in FIG. 7.
It can be corrected by the quadrupole magnetic field (polarity is reversed every half cycle) generated by a, 6b and 8a, 8b. Further, misconvergence occurs in the pattern having the tendency shown in FIG. 8 due to the vertical coma aberration, which is caused by the vertical coma aberration correction coils 7a, 7b and 9a, 9 as shown in FIG.
It can be corrected by the sextupole magnetic field generated by b (the polarity is reversed every half cycle) (see Japanese Patent Application Laid-Open No. 62-90094).

[0007]

However, in the above conventional example, the pair of E-shaped cores 2 and 3 are provided with the axial deviation correction coils 4,5 and the pair of vertical isotropic astigmatism correction coils. When winding the coils 6a, 6b, 8a, 8b and the pair of coma aberration correcting coils 7a, 7b, 9a, 9b, it is necessary to consider the left-right symmetry of the magnetic field.
In addition, the number of turns of the coils wound around the leg portions on both sides of each core 2 and 3 must be made uniform, and each coil must be connected to each other.

That is, in the case where the axial deviation correcting coils 4 and 5 are not added, a pair of U-shaped cores 10 and 11 are used as shown in FIG. A single vertical isotropic astigmatism correction coil 6, 8;
It suffices to wind the single coma-aberration correction coils 7 and 9, but it is not possible to correct the axial misalignment miscon with this configuration alone. Therefore, in order to correct this, the axial misalignment correction coil 4 is used. , 5 must be wound. Therefore, an E-shaped core is required for this purpose, and the winding man-hours for assembling the coil around the core, the assembling man-hours, the number of connecting wires, the number of insulating bobbins, etc. are significantly increased, which causes a cost increase.

Further, in the case of this conventional example, a change in the vertical deflection frequency causes a change in the impedance of the axis deviation correction coil to cause a phase difference and a change in the amount of current flowing, which causes a change in the axis deviation correction magnetic field. The intensity changes (hereinafter, abbreviated as “fv characteristic”).

The present invention has been made in order to solve such a problem, and provides a picture tube device having a small fv characteristic, which generates a magnetic field for axis deviation correction with a relatively simple and cost-effective construction. The purpose is to provide.

[0011]

A picture tube device according to a first aspect of the present invention for achieving the above object is a picture tube in which an in-line type electron gun is built, and a picture tube mounted on the picture tube. In a picture tube device having a self-convergence type deflection yoke, a pair of U-shaped cores are symmetrically arranged at an end of the deflection yoke on the electron gun side, and both legs of the pair of U-shaped cores are arranged. An axis deviation correction coil is provided on at least one of the outer side and the inner side of the section. With the above configuration, it is possible to generate an axial deviation correcting magnetic field equivalent to that when an E-shaped core is used.

A picture tube device according to a second configuration of the present invention for achieving the above object is a picture tube having an in-line type electron gun built-in, and a self-convergence type deflection yoke mounted on the picture tube. And a pair of U-shaped cores are symmetrically arranged at an end of the deflection yoke on the electron gun side, and the pair of U-shaped cores straddles both legs of the U-shaped core. It is characterized in that a coil for axial deviation correction is wound. With the above configuration, U
It is possible to easily attach the axis deviation correction coil to both leg portions (areas) of the character-shaped core. Then, it is possible to generate a magnetic field for axis misalignment correction equivalent to that when the E-shaped core is used.

Further, a picture tube device according to a third configuration of the present invention for achieving the above object is a picture tube having an in-line type electron gun built-in, and a self-convergence type mounted on the picture tube. In a picture tube device having a deflection yoke, a pair of U's is provided at the electron gun side end of the deflection yoke.
It is characterized in that the V-shaped cores are symmetrically arranged, and an axial deviation correction coil is provided between both legs of each of the pair of U-shaped cores. With the above configuration, the sensitivity of the magnetic field generated by the axis deviation correction coil is increased, the number of turns of the axis deviation correction coil is reduced, and the fv characteristic is decreased.

Further, in the picture tube device according to the first to third configurations of the present invention, a vertical isotropic astigmatism correction coil and a coil for vertical isotropic astigmatism correction are provided at the connecting portions of both leg portions of the pair of U-shaped cores. At least one of the coma aberration correcting coils is preferably wound. With this configuration, a single vertical isotropic astigmatism correction coil or a single vertical coma aberration correction coil is not required to be evenly wound around both legs of the core. Becomes

Further, it is preferable that a core is provided inside the axis deviation correcting coil. With such a configuration, the sensitivity of the magnetic field generated by the axis deviation correction coil is increased and the number of turns of the axis deviation correction coil can be reduced, so that the fv characteristic is reduced.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to Examples and drawings. An outline of the picture tube device according to the present invention is as shown in FIG. 11, and a deflection yoke Y is attached to a color picture tube having an in-line type electron gun G incorporated therein, and the deflection yoke Y is attached to an end portion on the electron gun side. A correction coil L is provided. The correction coil L is composed of a pair of U-shaped cores 13 and 14 described later.

FIG. 1 shows a correction coil and the like near the neck portion of a color picture tube device according to a first embodiment of the present invention. The cylindrical glass tube shown in FIG. 1 is the neck portion 12 of a 20-inch 90-degree deflection type color picture tube having an in-line type electron gun built-in, and a self-convergence type deflection yoke attached to this color picture tube. Is
It has a saddle-type horizontal deflection coil and a saddle-type vertical deflection coil, and generates a horizontal deflection magnetic field distorted in a pincushion shape by the former and a vertical deflection magnetic field distorted in a barrel shape by the latter.

1 is provided above and below the electron gun side end of the deflection yoke.
The pair of U-shaped cores 13 and 14 are arranged symmetrically. The upper U-shaped core 13 has a coil 16 for vertical isotropic astigmatism correction wound in two stages and a coil 16 for vertical comatic aberration correction wound on a common insulating bobbin 15 provided at a connecting portion of both leg portions 13a and 13b. A coil 17 and both legs 13
Axial deviation correction coil 1 wound over a and 13b
Eight. Further, the lower U-shaped core 14 has a vertical isotropic astigmatism correction coil 20 and a vertical coma that are wound in two stages on a common insulating bobbin 19 provided at a connecting portion of both leg portions 14a and 14b thereof. It has an aberration correction coil 21 and an axial deviation correction coil 22 wound around both leg portions 14a and 14b.

Further, the above-mentioned coil 1 for axial misalignment correction.
Cores 23 and 24 are provided on the inner sides of 8 and 22, respectively. In the upper U-shaped core 13, the vertical isotropic astigmatism correction coil 16 and the vertical coma aberration correction coil 1 are provided.
7 is wound with a 0.4 mm copper wire, and the number of turns is 43 and 63, respectively. The axis deviation correction coil 18 is wound with a 0.45 mm copper wire, and the number of turns is 54.
Times. Here, in particular, the vertical isotropic astigmatism correction coil 16 and the vertical coma aberration correction coil 17 are preferably wound in the middle of the connecting portion of the core, and the winding distribution of the coil is symmetrical.

The corresponding lower U-shaped core 14 has the same structure. The U-shaped cores 13 and 14 are made of silicon steel or ferrite and have a width of about 30 mm, a leg length of the U-shaped portion is 25 mm, the connecting portion has a side of 6 mm, and the leg has a square cross section of 5 mm. . The size of the U-shaped cores 13 and 14, that is, the distance between the U-shaped legs is appropriately determined according to the amount of misconvergence to be corrected, and the length of the core leg is
It suffices that the axial deviation correction coils 18 and 22 be attached, and the upper limit is limited by the shape of the deflection yoke in the portion to which the U-shaped core is attached.

In the upper U-shaped core 13, the inner core 23 of the axial deviation correction coil 18 has a width of 8 mm and a length of 1
The U-shaped core is made of a non-oriented electrical steel strip having a thickness of 1 mm and a thickness of 5 mm, and is positioned between the leg portions 13a and 13b of the U-shaped core 13 by a positioning bobbin made of nylon resin or the like. Two legs 13a, 13b of 13
Fixed to Further, the corresponding lower U-shaped core 14 has the same configuration (the core 24 in the U-shaped core 14 has the same structure).
2 is a schematic cross-sectional view of a portion including a).

The thickness and the number of turns of the copper wire used for the coil described above may be appropriately determined depending on the required correction magnetic field and the allowable current amount. Further, as the core material, other general silicon steel ferrite cores may be used.

Next, the principle of correction when the misalignment of misalignment is corrected by the above-described correction coil of the present invention will be described. A pair of axis deviation correction coils 18,
Reference numeral 22 causes a magnetic field for axis deviation correction as shown in FIG. 3 to act on the electron beams on both sides. That is, in FIG.
It is possible to generate an axial deviation correcting magnetic field having the same shape as that of the conventional E-shaped core shown in (b).

Further, the vertical isotropic astigmatism correction coil 1
6, 20 and vertical coma aberration correction coils 17, 21
Generates a correction magnetic field similar to those shown in FIGS. 7 and 9, respectively.

As is apparent from the above, according to the present invention, it is possible to easily attach the axial deviation correcting coils 18 and 22 to both leg portions (regions) of the U-shaped cores 13 and 14. Then, the U-shaped cores 13 and 1 thus configured
4 and the like can be used to generate the same correction magnetic field as when using the E-shaped core. Therefore, the extra winding of the coil, which is required in the case of the E-shaped core, becomes unnecessary, and the winding man-hour and the assembling man-hour can be reduced by half. Also,
Not only is it unnecessary to connect the coils wound in shunts to each other, but the number of insulating bobbins used can be reduced.

In the present embodiment, the configuration in which the cores 23 and 24 are provided inside the axis deviation correcting coils 18 and 22 has been described, but the present invention is not limited to this, and the cores 23 and 24 are provided inside. It is also possible to form the axis deviation correction coil with a configuration not including. However, since the number of turns of the axis deviation correction coil can be reduced in the configuration having the core inside the axis deviation correction coil as compared with the configuration having no core, the variation amount of miscon due to the deflection frequency can be reduced. It can be reduced. By the way, in the coil for axial deviation correction having the structure in which the core is inside as described in the present embodiment, when the number of turns is 54, the miscon change amount due to the fv characteristic was 0.05 mm. 64
The number of miscon changes due to fv characteristics is 0.2
It was 0 mm.

In the present embodiment, in addition to winding an axial deviation correction coil around each of a pair of U-shaped cores, a vertical isotropic astigmatism correction coil and a vertical coma aberration correction coil are wound. However, the present invention is not limited to this, and other, for example, a raster rotation cancel coil may be wound together, and the vertical isotropic astigmatism correction coil and the vertical coma aberration correction coil may be wound together. A configuration including either one of the above may be used.

Further, in the present embodiment, the configuration in which the pair of U-shaped cores are symmetrically arranged on the lower side above the electron gun side end of the deflection yoke has been described, but the present invention is not limited to this. For example, a pair of U-shaped cores may be symmetrically arranged on the left and right sides of the electron gun side end of the deflection yoke.

Next, a second embodiment of the present invention will be described with reference to FIG.
2 will be described. The difference between the second embodiment and the first embodiment described above is that the axis deviation correction coil 1 is used.
8 and 22 are installed positions.

In the second embodiment, the axis deviation correcting coil 18 is provided with both leg portions 13 of the upper U-shaped core 13.
a coil 13 for axial misalignment correction provided between a and 13b
Is provided between both leg portions 14a and 14b of the lower U-shaped core 14. Specifically, the U-shaped cores 13 and 14
In order to support and fix the axial deviation correcting coils 18 and 22 between both legs of the bobbin 25 and 26, a part of the bobbins 25 and 26 around which the axial deviation correcting coils 18 and 22 are wound is formed into U-shaped cores 13 and 14.
It is configured to straddle both legs. Other configurations are similar to those of the first embodiment.

Further, in the second embodiment, as shown in FIG. 12, the core 23 is provided inside the axial deviation correcting coil 18 provided in the upper U-shaped core 13. . Specifically, this core 23 is positioned at approximately the middle of the legs 13a and 13b of the U-shaped core 13 by using a positioning bobbin formed of nylon resin or the like, It is fixed to the legs 13a and 13b. Similarly, for the lower U-shaped core 14, a positioning bobbin formed of nylon resin or the like is used so that the core 24 is positioned substantially in the middle of the leg portions 14a and 14b of the U-shaped core 14. It is fixed. This core 23
Is composed of, for example, a non-oriented electromagnetic steel strip having a width of 13 mm, a length of 15 mm and a thickness of 2 mm.

In the second embodiment as well, the principle of correcting misalignment of misalignment is the same as that of the first embodiment. In addition, according to the second embodiment, the axis deviation correction coils 18, 2
When the winding number of 2 is 43, the miscon change amount due to the fv characteristic is 0.05 mm. Therefore, as compared with the case of the first embodiment described above, the number of windings required to obtain the same miscon change amount of 0.05 mm is smaller in the second embodiment.

In the first embodiment of the present invention, the outside of each leg of the pair of U-shaped cores (the state of straddling each leg of each pair of U-shaped cores). )
In the second embodiment of the present invention, a description will be given of the case where the coil for axial deviation correction is provided in the inside of both legs of each of the pair of U-shaped cores (each of the pair of U-shaped cores. The case where the coil for axial deviation correction is provided between the legs) has been described, but the present invention is not limited to this. For example, the axial deviation correcting coils may be provided on the outer side and the inner side of each leg of the pair of U-shaped cores in an appropriate balance.

In each embodiment of the present invention, 1
An axial deviation correction coil may be provided coaxially with the central axis of the U-shaped core on at least one of the outer sides and the inner side (both leg regions) of each leg of the pair of U-shaped cores.

[0035]

As described above, according to the picture tube device of the present invention, it is possible to generate a magnetic field for axial misalignment correction equivalent to that when an E-shaped core is used while using a U-shaped core. Also,
Since a single vertical isotropic astigmatism correction coil, a vertical coma aberration correction coil, etc. can be wound around the connecting portion of both legs of the U-shaped core, compared to the case of using the E-shaped core,
The assembly process and the number of parts can be significantly reduced.
Further, the amount of misconversion due to the fv characteristic can be reduced. Therefore, it is possible to provide a color picture tube which is cost-effective and is compatible with multi-scan.

[Brief description of drawings]

FIG. 1 is an enlarged view of a correction coil and the like near a neck portion of a color picture tube device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is an explanatory view of a magnetic field for axis deviation correction by the correction coil of FIG.

FIG. 4 is a diagram showing a pattern of misconvergence caused by axis deviation.

FIG. 5 is an explanatory diagram of a conventional magnetic field for axis deviation correction using an E-shaped core.

FIG. 6 is a diagram showing a pattern of misconvergence caused by vertical isotropic astigmatism.

FIG. 7 is an explanatory diagram of a conventional vertical isotropic astigmatism correction magnetic field using an E-shaped core.

FIG. 8 is a diagram showing a pattern of misconvergence caused by vertical coma.

FIG. 9 is an explanatory diagram of a conventional vertical coma aberration correcting magnetic field using an E-shaped core.

FIG. 10 is a front view of a conventional correction magnetic field generator using a U-shaped core.

FIG. 11 is a diagram showing a positional relationship between a deflection yoke and a correction coil in a picture tube device.

FIG. 12 is an enlarged view of a correction coil and the like near the neck portion of the color picture tube device according to the second embodiment of the present invention.

[Explanation of symbols]

 13, 14 U-shaped core 16, 20 Vertical isotropic astigmatism correction coil 17, 21 Vertical coma aberration correction coil 18, 22 Axis deviation correction coil 23, 24 Core G In-line electron gun L Correction coil Y Deflection yoke

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichiro Taniwa 1-1, Saiwaicho, Takatsuki City, Osaka Prefecture Matsushita Electronics Industrial Co., Ltd.

Claims (5)

[Claims] 1. A picture tube device having a picture tube having an in-line type electron gun built-in, and a self-convergence type deflection yoke attached to the picture tube. A pair of U-shaped cores are symmetrically arranged, and an axial deviation correction coil is provided on at least one of the outer side and the inner side of each leg of the pair of U-shaped cores. Tube device. 2. A picture tube device having a picture tube having an in-line type electron gun built-in, and a self-convergence type deflection yoke mounted on the picture tube, wherein one end of the deflection yoke on the side of the electron gun is provided. A picture tube device in which a pair of U-shaped cores are symmetrically arranged, and an axial deviation correction coil is wound over both legs of each of the pair of U-shaped cores. . 3. A picture tube device having a picture tube containing an in-line type electron gun and a deflection yoke of a self-convergence type mounted on the picture tube, wherein the deflection yoke has an end on the electron gun side. A picture tube device, wherein a pair of U-shaped cores are arranged symmetrically, and an axis deviation correcting coil is provided between both legs of each of the pair of U-shaped cores. 4. The vertical isotropic astigmatism correction coil and at least one of the coma aberration correction coil are wound around the connecting portions of both legs of each of the pair of U-shaped cores. The picture tube device according to 2 or 3. 5. The picture tube device according to claim 1, wherein a core is provided inside the axis deviation correction coil.