JPS6028033Y2 - 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, the magnetic field generated by the vertical deflection coil is basically divided into the barrel distributed magnetic field 1 and the waist horizontal deflection coil, as shown in Figure 1. By converting the magnetic field generated from the magnetic field into a bin cushion distributed magnetic field 2, the convergence shift is corrected and an image with good convergence characteristics is 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, the raster distortion due to the difference in the curvature of the screen and the deflection curvature of the beam is
As shown in FIG. 2, the left and right sides still have pincushion 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.

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 reducing left and right pincushion distortion. The present invention relates to a deflection device that achieves correction.

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. Deploy.

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, arms 61 extend from both ends of the magnetic body 5 toward the cone side of the cathode ray tube and correspond approximately to the diagonal line of the cathode ray tube screen.
6° are formed as a pair.

Therefore, a magnetic field synchronized with the vertical deflection magnetic field is generated in this arm 61.6°, 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
N poles are generated at the right arms 63, 6 . In this case, an S pole is generated, and a bottle cushion 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 is swinging the beam downward from the horizontal axis, and the bottle cushion magnetic field due to the arm is a component that 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 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 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 disposed 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 reason, the magnetic body is attached to the deflection yoke as shown in FIGS. 6 to 9.

That is, a pair of toroidal vertical coils 41 and 4° are respectively wound around a frusto-conical core 3 formed by a pair of half-conical cores 3□ and 3□ facing each other.

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

This coil separator 10 has a front enlarged part 11 with a hole in the center, a conical part 12 (the part where the vertical coil device 4 is installed in the figure) formed continuously from this transparent part, and this conical part. Rear enlarged part 13 formed continuously at the tip
It consists of

Note that the front enlarged portion 1 and the conical portion 12 may be continuously formed with a gently curved surface.

Next, as shown in FIG. 7, from the conical portion 12 of the coil separator 10 where both ends of the pair of troital vertical coils 41, 4□ face each other, the front enlarged portion 1
The protruding piece 15 is made to protrude in the same direction as the front enlarged part 11 at a constant minute interval.

A hook portion 16 is formed at the tip of this protruding piece 15.

Next, the magnetic body is constructed approximately as shown in FIGS. 8 and 9.

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.
It is formed from L, 21°.

Next, an L-shaped tongue piece 22 is made to protrude from the lower side edge of the approximately central portion of the main body portion 20, and a through hole 23 into which the protruding piece 15 of the coil separator can be inserted is formed at the base of the tongue piece 22.

As shown in FIG. 8, the magnetic material constructed in this way is attached to the front enlarged portion 11 of the coil separator by attaching the tongue piece 22 of the magnetic material to the front enlarged portion 11 of the coil separator.
The projecting piece 15 is inserted or press-fitted between the back surface of the magnetic body and the protruding piece 15, and the protruding piece 15 is inserted into the through hole 23 of the magnetic body, and the hook part 16 is used to attach the main body part 20 (the curved outside of the main body part 20 corresponding to the tongue piece 22). to be locked.

In this manner, the tongue piece 22 is inserted between the back surface of the front enlarged portion 11 and the protrusion piece 15, thereby restricting movement of the magnetic body in the tube axis direction.

Further, the magnetic material is a contact portion 24 as shown in FIG. ．． 2
42 and the tongue piece 22 as shown in FIG. 9 come into contact with the back surface of the front enlarged portion 11 of the coil separator, so that stability can be achieved by three-point support.

Note that instead of forming this hook portion 16, the tip of the protrusion piece 15 may be fused and locked to the main body portion 20.

Furthermore, the present invention is further improved by forming a plurality of the protruding pieces and the through holes 22.

According to the magnetic body mounting structure having such a configuration, the specially structured magnetic body can be easily and reliably fixed to the coil separator, and the magnetic body can be prevented from vibrating due to magnetostrictive vibration, etc. This can prevent an adverse effect on the raster distortion correction characteristics.

[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 shows the state in which the magnetic body is attached. FIG. 9 is a perspective view of the main part shown, and FIG. 9 is an enlarged view of the main part of the magnetic body. 10... Coil separator, 11...
Front enlarged portion, 15...Protruding piece, 20...
・Magnetic material.

Claims (1)

[Claim for Utility Model Registration] A deflection device comprising a color cathode ray tube having an in-line electron gun, a vertical deflection coil device that generates a barrel-shaped deflection magnetic field, and a horizontal deflection coil device that generates a bottle-shaped deflection magnetic field. A coil separator comprising a front enlarged part and a conical part and having a pair of projecting pieces protruding from the conical part in the direction of enlargement of the front enlarged part; The vertical deflection coil device includes a pair of vertical coils wound in a toroidal manner, and the protruding piece is provided on a curved main body portion of the vertical deflection coil device where both ends of the pair of vertical coils face each other. a through hole into which is inserted, a tongue piece provided in connection with the main body part and inserted between the back surface of the front enlarged part and the protruding piece, and a tongue piece that extends from both ends of the main body part on a diagonal line of the cathode ray tube screen. A deflection device comprising: a magnetic body having opposing arms protruding toward a cone portion of a cathode ray tube, the protruding piece being locked to the main body portion.