JPS58175246A - Deflection device - Google Patents

Abstract

PURPOSE:To achieve correction of right-and-left pincushion distortion by leading- out a stray magnetic field of a vertical deflection coil of a deflection yoke to the frontal part of the deflection yoke by means of a magnetic substance in order to influence a vertical deflection barrel magnetic field toward the pincushion magnetic field in the frontal part. CONSTITUTION:In case the magnetic field of a vertical coil 4 and 4' swings a beam down the horizontal axis, the magnetic field B of the vertical coil 4 and 4' is generated in the direction from left to right (from the N-pole to the S-pole) seen from the front of a cathode ray tube as to be seen from Fig. (b), whereby the pincushion magnetic field C is generated in the same direction as the vertical coil magnetic field B also between the lower arms 62 and 64. The pincushion magnetic field C generated thereby between the arms 62 and 64 bears a component F1, which pulls the beam downward, and the component F2, which pushes the beam inward, due to the component force of magnetic flux in the lower diagonal part of the cathode ray tube screen and owing to said components, the diagonal part downward the right-and-left pincushion distortion raster D is pushed in the direction reducing the right-and-left pincushion distortion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deflection device for a color cathode ray tube equipped with an in-line electron gun (a system in which three electron guns are arranged horizontally in a straight line).

In color television reception using a color cathode ray tube with such an in-line electron gun, the magnetic field generated by the vertical deflection coil is defined as the barrel distributed magnetic field 1, and the horizontal deflection as shown in Figure 1 is approximately 6ζ. By using the magnetic field generated from the coil as a pincushion distributed magnetic field 2, convergence deviations are corrected and images with good convergence characteristics are reproduced. Generally, such a method is implemented as a self-convergence method.

By the way, although a good convergence effect can be obtained by adopting such a method, due to the difference in the curvature of the screen and the deflection curvature of the beam, the raster distortion still has pincushion-shaped distortion on the left and right sides, as shown in Figure 2. There is.

Currently, in order to correct this left-right pincushion distortion, a left-right pincushion distortion correction circuit device is added that corrects the left-right pincushion distortion by superimposing a signal whose amplitude changes in a parabolic manner in synchronization with the vertical signal on the horizontal signal.

However, such a distortion correction circuit device is backwards in terms of resource saving, cost reduction, and simplification, and improvements have been desired.

The present invention has been devised to address these issues, and provides a highly sophisticated deflection device with an extremely simple configuration.

That is, the leakage magnetic field of the vertical deflection coil of the deflection yoke is guided to the front surface of the deflection yoke using a magnetic material, and the vertical deflection barrel magnetic field is influenced in the direction of the pincushion pleat magnetic field at the front surface, thereby reducing left and right pincushion distortion. The present invention relates to a deflection device that achieves correction.

Embodiments of the present invention will now be described in detail with reference to the drawings.The barrel-type farm deflection magnetic field shown in FIG. 1 is wound around a truncated conical core 3 as shown in FIG. This is achieved by a pair of toroidally wound vertical deflection coils 4, 4'.

As a matter of mttti, it has been experimentally proven that to correct left and right pincushion distortion of the raster, the vertical deflection magnetic field should be set to a pincushion, and to correct vertical pincushion distortion, the horizontal deflection magnetic field should be set to a pincushion. The convergence of the beam is determined by the overall barrel or bottle magnetic field of the magnetic field generated by the deflection yoke's neck side and cone side, but the raster distortion is It has also been confirmed that the magnetic field on the cone side has a strong effect.

Therefore, in the deflection device of the present invention, as shown in FIG. 4, a magnetic material 5 is placed on the core 3 on opposite sides of a pair of toroidal vertical coils 4.4 which are toroidally wound to face one cylindrical core 3. Deploy.

As can be seen from the magnetic flux generation diagram in Figure 3, this part is where the magnetic flux generated by the upper vertical coil 4 and the magnetic flux generated by the lower vertical coil 4 repel each other. , where the magnetic field generated by the vertical coil is strongest. Therefore, it is possible to pick up the leakage magnetic field from the vertical coil in the most efficient manner.Next, arms 51 and 51, which extend from both ends of the magnetic body 50 toward the cone side of the cathode ray tube and correspond approximately to the diagonal wire number of the cathode ray tube screen, are integrally formed. Therefore, a magnetic field synchronized with the St* deflection magnetic field is generated in these arms 61, 611, and the arrangement as seen from the front of the cathode ray tube is as shown in FIG. If the direction of magnetic flux is generated from left to right, N poles will occur at arms 61 and 62 on the left, and N poles will occur at arms 63 and 62 on the right.
An S pole is generated at ゜64, and this field generates magnetic flux in arm 5r-63 and arm (5-64), and as shown in Fig. 5A, a vertical barrel magnetic field for deflection is generated. With respect to B, a pincushion magnetic field C is generated on the cone side. When swinging downward, as shown in Figure 5, the magnetic field B of the vertical coil is generated from left to right (from N pole to S pole) when viewed from the front of the cathode ray tube. A bottle cushion-shaped magnetic field C is generated between the lower arms 62-64 in the same direction as the vertical coil magnetic field B. At this time, a pincushion-shaped magnetic field C is generated between the arms 62-64 @.
has a component F1 that pulls the beam downward and a component F2 that pushes the beam inward at the lower diagonal corner of the cathode ray tube screen due to the component force of the magnetic flux. The lower diagonal portion of raster D is pushed in the direction in which left-right pincushion distortion is reduced. At this time, the magnetic field generated in the upper arms 61-61 II does not act on the beam, so it does not substantially affect the 11-plane raster.

Next, if the magnetic field of the vertical coil swings the beam upward from the horizontal axis, the magnetic field B of the vertical coil will move from right to left (from N pole to S pole) as shown in Figure 5.
pole), which causes the upper arm 61-
Also between 63 and 63, a bottle cushion-shaped magnetic field C is generated in the same direction as the vertical coil magnetic field B. This pincushion-shaped magnetic field C is located in the upper diagonal corner of the cathode ray tube screen and has a component Fl that pulls the beam upward and a component F2 that pushes the beam inward. This component pushes the upper diagonal portion of the left-right pincushion distortion raster D in a direction that reduces left-right pincushion distortion. At this time, the lower arm 5
The magnetic field generated during +-5 seconds does not act on the beam, so it does not substantially affect the screen raster. As a result, the raster distortion is exactly pushed in the direction of arrow A in FIG. 2, and a raster with significantly improved linearity can be obtained.

According to this method, the vertical deflection magnetic field can be changed in the direction of the bottle cushion magnetic field only on the cone side, so if the vertical deflection coil magnetic field is made into a barrel magnetic field as a whole, there is no convergence. It is possible to correct only the raster distortion without having any or only slight influence on the image. This can be effectively achieved by a dynamic leakage field that is synchronized with the vertical deflection field.

In addition, without the need for any other special circuits and circuit components for correcting left-right pincushion distortion, or permanent magnets, etc., the leakage flux of the vertical deflection magnetic field can be utilized by using appropriate pieces of magnetic material. It is possible to correct pincushion distortion.

As shown in FIG. 6, the magnetic bodies include four independent magnetic bodies 719 that are substantially opposed to each other on the diagonal line of the cathode ray tube screen.
You may place 7 wealth, 73174.

As described above, according to the present invention, a self-convergence type in-line electron gun is provided by guiding the leakage magnetic field of the vertical deflection magnetic field to the cone side using a magnetic material and facing the opposite line of the cathode ray tube screen. In principle, it is possible to correct left and right pincushion distortion in color cathode ray tubes, but in order to make this method even more effective, we developed a color cathode ray tube deflection device that uses an in-line electron gun of the self-convergence method. Various improvements can be made.

For example, the upward opening component in the upper part and the downward pulling component in the lower part due to the magnetic field generated by the arm are larger in the central part than in the diagonal parts of the screen, so this effect causes vertical raster distortion. is about to occur, so by setting the horizontal coil in advance so that the neck part has a bottle magnetic field distribution and the cone part side has a parallel magnetic field distribution, the secondary influence can be eliminated. .

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1 - Hibiki Kazusho 4 Dechi's daughter-in-law ζ 1 form → Kozumena → voice rumored H1 woman, -゛1 is removed. On the other hand, if distortion occurs in the upper direction, consciously shift the arm from the Wi line direction to the left and right by changing the arrangement position, length, size, width, material, etc. By doing so, it is also possible to adjust to the best point while relatively adjusting the horizontal and vertical distortions.

As described above, according to the deflection device according to the present invention, the leakage magnetic field of the vertical deflection coil is guided to the cone side of the deflection coil by the magnetic material, and the vertical deflection magnetic field exhibiting a barrel magnetic field is transferred to the cone side in the direction of the bottle cushion magnetic field. It is possible to deal with this as a self-convergence by making the vertical barrel-type magnetic field more barrel-shaped by assuming in advance the change in the direction of the bottle cushion magnetic field, and further reducing left-right pincushion distortion. This invention has the advantage that it is possible to provide a deflection device that can also correct other distortions, making it extremely useful in practical use.

[Brief explanation of the drawing]

M! Figure 1 is a diagram showing the deflection magnetic field state of a self-convergence type color cathode ray tube with an in-line electron gun, and Figure 2 is a diagram showing raster distortion in the case of Figure 1.
Fig. 3 is a diagram showing the vertical deflection magnetic field in the case of Fig. 1, Fig. 4 is a side view showing the deflection device according to the present invention, and Fig. JlK5 is a diagram showing the state of the vertical deflection magnetic field according to the present invention in Fig. 4. ,
FIG. 6 is a side view of a deflection device showing another embodiment. 1 is a vertical deflection magnetic field, 2 is a horizontal internal magnetic field, 3 is a core, 4.
4' is a vertical deflection coil, 5 is a magnetic material, 61, 62. 5
3. 54 indicates arms, respectively. Representative Patent Attorney Kensuke Norichika (and 1 other person) 11 En 2nd Preceding No. 31 No. 71 - Mouth

Claims (2)

[Claims] (1) A color cathode ray tube having an in-line electron gun, a horizontal deflection coil that generates a Bin Cushion type deflection magnetic field, and a vertical deflection coil that generates a barrel type deflection magnetic field;
A magnetic body is provided so as to collect the leakage magnetic flux generated from the vertical deflection coil, radiate it to the cone side of the vertical deflection coil, and change it in the direction of the magnetic field on the cone side of the cathode ray tube. , self-convergence is achieved by making the barrel-shaped deflection magnetic field of the single direct deflection coil more barrel-shaped by assuming in advance the change in the direction of the pincushion magnetic field generated by the magnetic material on the cone side of the vertical deflection coil. and pincushion distortion correction. (2) The horizontal deflection coil is constructed such that the neck side is configured with a pink twin-scene magnetic field and the cone side is configured with a barrel magnetic field, so that the entire magnetic field of the horizontal deflection coil exhibits a pink twin-scene deflection magnetic field. Deflection device as described in Section.