JPS6228043Y2 - - 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 making the magnetic field generated from the coil a pink tension 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 distortion as a raster still has a pincushion shape on the left and right sides as shown in Figure 2. It has distortion.

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.

In other words, 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 pink tension magnetic field at the front part, thereby correcting left-right pincushion distortion. This invention relates to a deflection device that achieves the following.

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. has been done.

As a matter of principle, it has been experimentally proven that to correct left and right pincushion distortion of a raster, the vertical deflection magnetic field should be set to pink tension, and to correct vertical pincushion distortion, the horizontal deflection magnetic field should be set to pink tension. The magnetic field generated by the deflection yoke determines the convergence of the beam by the overall barrel or pin magnetic field of the neck side and cone side of the deflection yoke, but raster distortion It has also been confirmed that this is strongly influenced by the magnetic field on the cone 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 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, the leakage magnetic field from the vertical coil can be picked up most efficiently.
Next, arms 6 ₁ and 6 ₂ are integrally formed extending from both ends of the magnetic body 5 toward the cone portion of the cathode ray tube and substantially corresponding to the diagonal line of the cathode ray tube screen. Therefore, a magnetic field synchronized with the vertical deflection magnetic field is generated in the arms 6 ₁ and 6 ₂ , 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, N poles will be generated in the left arms 6 ₁ and 6 ₂ , and N poles will be generated in the right arms 6 ₃ and 6 ₄ . An S pole is generated, and a pink tension magnetic field is generated on the cone side with respect 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 pink tension magnetic field from the arm has a component 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 b 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.
Furthermore, when 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 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 pink union 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. Alternatively, it is possible to correct only raster distortion without having only a slight influence. This can be effectively achieved by a dynamic stray 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 left-right pincushion distortion correction, or permanent magnets, etc., the leakage flux of the vertical deflection magnetic field is utilized by using an appropriate piece of magnetic material. This makes it possible to effectively 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. , the magnetic field picked up from this must be effectively guided 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 by way of example in FIGS. 6 to 8.

That is, a pair of toroidal vertical coils 4 ₁ and 4 ₂ are respectively wound around a frusto-conical core 3 formed by a pair of semi-conical cores 3 ₁ and 3 ₂ facing each other. 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
is a front enlarged part 11 with a hole in the center, a conical part 12 (the part where the vertical coil device 4 is attached in the figure) formed continuously from this transparent hole part, and a tip of this conical part. was formed. It is composed of a rear enlarged section 13. Note that the front enlarged portion 1
1 and the conical portion 12 may be formed continuously by a gently curved surface. Next, as shown in FIG. 7, arms 14 extending in the direction of the cone of the cathode ray tube are formed at four portions of the front enlarged portion 11 located on diagonal lines of the cathode ray tube screen. Protrusions 15, 15' are formed near the tip of this arm 14, facing each other at a predetermined distance. One of the arms 211 formed at both ends of the magnetic main body 20 is inserted and locked between the protrusions 15, 15 _' .

That is, 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 part 20, which is formed of a pair of arms 21 ₁ and 21 ₂ extending from both ends of the main body part 20 on a diagonal line of the cathode ray tube screen toward the cone of the cathode ray tube.

The main body portion 20 of the magnetic material formed in this way is attached along the front enlarged portion 11 of the coil separator 10, and the intermediate portion or the tip of the pair of arms 21 ₁ and 21 ₂ is inserted between the protrusions of the arms 14 and 14. Press fit and support.

In other words, the arms 21 ₁ , 2
This is to lock and hold the arms 21 ₁ , 21 ₂ as well, and to properly regulate the position of the arms 21 ₁ , 21 2 or to prevent magnetic field fluctuations due to vibration of the arms _themselves . It is designed so that even _two parts are locked. In the illustrated embodiment, assuming that the arms 21 ₁ and 21 ₂ are relatively long, the intermediate portions of the arms 21 ₁ and 21 ₂ are locked by the arm 14;
Ideally, the arms 21 ₁ , ₂₁ should be locked at a position that best prevents vibration of the arms 21 ₁ , 21 .
It is obvious that the generation of vibration can be reduced by locking any of the locations of ₂ with the arm 14, and the configuration of the arm 14 for this purpose does not need to be specific to that shown in the figure, and various other structures may be used. , it is clear that the arrangement can be taken.

With the above configuration, it is possible to effectively support the arm extending from the magnetic body in the direction of the cone part, thereby preventing vibration of the arm due to magnetostrictive vibration of the magnetic body, and improving the raster distortion correction characteristic. It is possible to prevent adverse effects on Note that the main body portion of the magnetic body can be further fixed using other fixing means.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the state of the deflection magnetic field in the self-convergence method of a color cathode ray tube with an in-line electron gun, Figure 2 is a diagram showing raster distortion in the case of Figure 1, and Figure 3 is the diagram of Figure 1. FIG. 4 is a side view showing the deflection device according to the present invention, FIG. 5 is a diagram showing the state of the vertical deflection magnetic field according to the present invention in FIG. FIG. 7 is an enlarged view of the main part of the coil separator, and FIG. 8 is a perspective view of the main part showing the state in which the magnetic body is attached. DESCRIPTION OF SYMBOLS 10...Coil separator, 11...Front expansion part, 15...Protrusion, 20...Main body part of magnetic material.

Claims (1)

[Scope of utility model registration request] 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 pincushion-type deflection magnetic field, which is attached to the cathode ray tube neck portion. a coil separator comprising a front enlarged part and a conical part and having arms protruding from at least four parts of the front enlarged part located substantially in a diagonal direction of the cathode ray tube screen; the vertical deflection coil device comprising a pair of vertical coils toroidally wound around a conical core; and a pair of magnetic bodies disposed in the portions of the vertical deflection coil device in which opposite ends of the pair of vertical coils face each other. , comprising an arm that is a part of the magnetic body, projects integrally from both ends of the magnetic body in the diagonal direction of the screen of the cathode ray tube toward the cone of the cathode ray tube, and is supported and fixed by the arm. Deflection device.