JPS6028034Y2 - deflection device - Google Patents

Description

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

In a color television receiver using a color cathode ray tube with such an in-line electron gun, as shown in Figure 1, the magnetic field generated by the vertical deflection coil is basically the barrel distributed magnetic field 1, and the horizontal deflection By using the magnetic field generated from the coil as a Bin Cushion 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-finishing distortion still has a pincushion shape on the left and right sides, as shown in Figure 2. It has a distortion of

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 an eight-correction path 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 significantly improved 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 part of the deflection yoke using a magnetic material, and the vertical deflection barrel magnetic field is influenced in the direction of the bottle cushion magnetic field at the front part of the waist, thereby correcting left and right pincushion distortion. This relates to a deflection device that is distantly related to the above.

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

By the way, the barrel-shaped vertical deflection magnetic field shown in FIG. 1 is distantly related to a pair of toroidal-wound vertical deflection coils 4, 4' wound around a truncated conical core 3 as shown in FIG. ing.

In principle, experiments have shown that to correct left and right pincushion distortion of a raster, the vertical deflection magnetic field can be used as a bottle cushion, and to correct vertical pincushion distortion, the horizontal deflection magnetic field can be used as a bottle cushion. It has been confirmed that the magnetic field generated by the deflection yoke determines the convergence of the beam by the overall barrel or bottle magnetic field of the neck side and cone side of the deflection yoke, but the raster distortion is It has also been confirmed that it is strongly influenced by the magnetic field on the side.

Therefore, in the deflection device of the present invention, as shown in FIG. Place.

As can be seen from the magnetic flux generation diagram in Figure 3, this part is
This 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, and where the magnetic field generated by the vertical coil is strongest.

Therefore, the leakage magnetic field from the vertical coil can be picked up most efficiently.

Next, an arm 61 extending from both ends of the magnetic body 5 toward the cone side of the cathode ray tube and corresponding to a diagonal line of the cathode ray tube screen;
6° is integrally formed.

Therefore, a magnetic field synchronized with the vertical deflection magnetic field is generated in the arms 6□, 6°.The arrangement as viewed from the front of the waist cathode ray tube is as shown in FIG.

That is, if the magnetic flux direction of the vertical deflection magnetic field is generated from left to right as shown in the figure, then the left arms 61, 6
N poles are generated in each of the squares, and S poles are generated in the right arms 63 and 64, which means that a bottle cushion magnetic field is generated on the cone side in response to the vertical barrel magnetic field of the deflection yoke.

At this time, the magnetic field of the vertical coil swings the beam downward from the horizontal axis, and the bottle cushion magnetic field from the arm pulls the beam downward at the lower diagonal part of the cathode ray tube screen, as shown in Figure 5. It has a component opening that pushes the component A and the beam inward.

This component pushes the lower diagonal portion of the left-right pincushion distortion raster in a direction that reduces left-right pincushion distortion.

At this time, the magnetic field generated from the upper arm does not act on the beam, so it does not substantially affect the screen.

If the magnetic field of the vertical coil swings the beam above the horizontal axis, the aforementioned magnetic flux in the opposite direction is generated and acts in a direction that reduces the left-right pincushion distortion raster above the 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. This makes it possible to correct only raster distortion without having a slight or slight effect.

This can be effectively related to a dynamic leakage magnetic field that is synchronized with the vertical deflection magnetic 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.

By the way, as described above, the magnetic body having the arms is arranged near the maximum density of the leakage magnetic field on the vertical deflection coil, that is, on opposite sides of a pair of toroidal vertical coils that are toroidally wound opposite to the cylindrical core. , it is necessary to effectively guide the magnetic field picked up from this to the cone side of the cathode ray tube, which is opposed approximately diagonally to the cathode ray tube screen.

For this purpose, the magnetic body is attached to the deflection yoke as shown in FIGS. 6 to 12.

That is, a pair of semi-conical cores 3. , 32, and a pair of toroidal vertical coils 41 and 4° are wound around the truncated conical core 3, respectively, facing each other.

This vertical coil device 4 is made of an insulating synthetic resin or the like and is attached to a morning glory-shaped coil separator 10.

This coil separator 10 consists of a front enlarged part 11 with a hole in the center, a conical part 12 (the part where the vertical col device 4 is attached in the figure) formed continuously from this transparent hole part, and a conical part 12 (the part where the vertical col device 4 is attached in the figure). Rear enlarged part 1 formed continuously at the tip
It consists of 3.

Note that the front enlarged portion 11 and the conical portion 12 may be continuously formed with a gently curved surface.

Next, as shown in FIG. 7, a pair of opposing insertion holes 15 are provided in the outer circumferential surface 14 of the front enlarged portion 11 of the coil separator in the vicinity of opposing opposite ends of the pair of toroidal vertical coils.

Next, the magnetic body is constructed approximately as shown in FIG.

That is, it has a length that can effectively pick up the leakage magnetic field of the vertical coil and generate a magnetic field from the arms facing diagonally from the cathode ray tube screen from both ends, and is curved to approximately follow the curved surface of the vertical coil device 4. There is a body portion 20, and a pair of arms 21 extending from opposite ends of the body portion 20 on the diagonal of the cathode ray tube screen toward the cone portion of the cathode ray tube. ．． It takes shape from 21°.

This magnetic body is attached to the coil separator 10 by press-fitting the arms 2L and 21° into the insertion holes 15 of the coil separator (2).

At this time, arm 21. , 21 degrees as shown in FIGS. 8 and 9, the press-fit fixation can be made more reliable.

It is also possible to bend the arms 2L, 21° outward along the curve of the cathode ray tube, as shown by dotted lines in FIG.

FIG. 10 shows another modification of the shape of the magnetic body.

Also, as shown in FIG.
The cut-and-raised part 22 may be press-fitted into the insertion hole 15 of the enlarged front part 11 as shown in FIG.

According to the magnetic body mounting structure configured as described above, the specially structured magnetic body can be easily attached and fixed to the coil separator from the outer periphery with one touch, thereby preventing magnetostrictive vibration of the magnetic body, etc. A deflection device that does not affect raster distortion correction characteristics can be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the deflection magnetic field state of a self-comparison method of a color cathode ray tube having an in-line electron gun;
FIG. 2 is a diagram showing the raster distortion in the case of FIG. 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. The figures are a diagram showing the state of the vertical deflection magnetic field according to the present invention in FIG. 4, FIG. 6 is an overall perspective view of the deflection yoke, and FIG. 7 is a perspective view showing the state in which the magnetic body is attached to the coil separator. 8th
9 and 9 are perspective views showing the arm structure of the magnetic material, FIG. 10 is a perspective view showing another modification of the shape of the magnetic material, and FIG.
This figure and FIG. 12 are perspective views showing another modification of the magnetic arm structure and how it is attached to a coil separator. 10... Coil separator, 11...
Front enlarged part, 15...Insertion hole, 20...
...Magnetic material, 211.21°...Arm.

Claims (1)

[Scope of utility model registration request] In a deflection device comprising a color cathode ray tube having an in-line electron gun, a vertical deflection coil device that generates a barrel-type deflection magnetic field, and a horizontal deflection coil device that generates a bottle cushion-type deflection magnetic field, the cathode ray tube neck portion A coil separator is attached and has a pair of insertion holes formed on the outer circumferential surface of the front enlarged part, which is made up of a front enlarged part and a conical part, and a coil separator is attached to the conical part of this coil separator and is toroidally wound around a truncated conical core. the vertical deflection coil device consisting of a pair of vertical coils, a pair of magnetic bodies disposed in a portion where both ends of the pair of vertical coils of the vertical deflection coil device are opposite, and a part of the magnetic body. It is characterized by comprising arms that are opposed to each other in the diagonal direction of the cathode ray tube screen from both ends of the magnetic body, protrude integrally toward the cone of the cathode ray tube, and are press-fitted and supported in the insertion holes of the coil separator. Deflection device.