JPS5817323Y2 - 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 baren distributed magnetic field 1, and the horizontal deflection is 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 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 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, thereby correcting the left and right pincushion distortion. This invention relates to the deflection device that has been achieved.

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 achieved by a pair of toroidal-wound vertical deflection coils 4, 4' wound around a truncated conical core 3 as shown in FIG. There is.

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 formed integrally.

Therefore, a magnetic field synchronized with the vertical deflection magnetic field is generated in the arms 61 and 62, and the arrangement as seen from the front of the 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
A N pole is generated in each of the arms 6a and 64 on the right side.
An S pole is generated, and a bottle cushion magnetic field is generated on the cone side just as compared to the vertical barrel magnetic field of the deflection yoke.

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

Further, when the magnetic field of the vertical coil swings the beam above the horizontal axis 8, 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 almost no effect on convergence. This makes it possible to correct only raster distortion without having any or only slight effect 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.

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 11.

That is, a pair of toroidal vertical coils 4□, 4□ are wound around a frusto-conical core 3 formed by a pair of semi-conical cores 31, 3 degrees facing each other, respectively.

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

This coil separator 10 includes a front enlarged part 11 with a hole in the center and a conical part 12 formed continuously from the front enlarged part 11 (the part where the vertical coil device 4 is attached in the figure). (see FIG. 7) and a rear enlarged portion 13 formed continuously at the tip of this conical portion.

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 protrusions 1 are opposed to the outer circumferential surface 14 of the front enlarged portion 11 of the coil separator in the vicinity where both ends of the pair of toroidal vertical coils are opposed.
5 will be provided.

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

That is, it has a length such that it can effectively pick up the leakage magnetic field of the vertical coil and generate a magnetic field from the arms diagonally opposite the cathode ray tube screen from both ends thereof, and is curved to approximately follow the curved surface of the vertical coil device 4. There is a main body portion 20, and a pair of arms 2 extending from both ends of the main body portion 20 on a diagonal line of the cathode ray tube screen toward the cone portion of the cathode ray tube.
11,212.

This arm 21□. A through hole 22 as shown in FIG. 9 or a notch 23 as shown in FIG. 10 is formed in 212 to fit or engage with the protrusion 15 of the coil separator.

The thus formed magnetic body is attached and fixed by abutting the coil separator from the outer periphery and engaging the retaining holes 22, 23 of the arms 21□, 212 with the protrusion 15 of the coil separator.

FIG. 11 shows the state of engagement between the protrusion 15 and the engagement hole 22.

Note that the protrusion 15 may be endowed with elastic force so that the arm is elastically supported between the protrusion 15 and the outer circumferential surface of the enlarged front portion.

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 a single touch, thereby preventing magnetostrictive vibration of the magnetic body, etc. A deflection device that does not affect distortion correction characteristics can be obtained.

[Brief explanation of drawings]

FIG. 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;
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 figure shows 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, Fig. 7 is an enlarged view of the main part of the coil separator, and Fig. 8 is an overall perspective view of the magnetic body. Figures 9 and 10 are perspective views of main parts showing the retaining hole of the magnetic material, and Figure 1.
FIG. 1 is a sectional view of a main part showing a state in which a coil separator and a magnetic material are held together. 10... Coil separator, 11...
Front enlarged portion, 15...Protrusion, 20...
Magnetic material, 22.23... retention hole.

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 to the conical part of the coil separator and has a pair of ρ protrusions formed oppositely on the outer peripheral surface of the front enlarged part. The vertical deflection coil device includes a pair of wound 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 face each other, and both ends of the magnetic body. A deflection device comprising: an arm having a retaining hole that faces diagonally from the screen of the cathode ray tube and integrally projects toward the cone of the cathode ray tube and engages with the protrusion of the coil separator.