JPH0525163Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a deflection device for a color picture tube incorporating an in-line electron gun.

[Technical background of the invention and its problems]

In a color television receiver equipped with a color picture tube equipped with an in-line electron gun, as shown in Figure 4, the magnetic field generated by the vertical deflection coil is generally referred to as barrel magnetic field 1, and the magnetic field generated by the horizontal deflection coil is defined as barrel magnetic field 1. By using a pink tension magnetic field 2, the convergence shift is corrected and an image with good convergence characteristics is reproduced. Generally, such a method is called a self-convergence method, and is widely practiced.

By the way, although a good convergence effect can be obtained according to such a self-convergence method, raster distortion still occurs due to differences in the curvature of the screen of the color picture tube and the beam deflection curvature, as shown in the left and right arrows 3 as shown in FIG. The portion shown by 2 protrudes outward, and the left and right sides have a pincushion-shaped distortion 4.

As a technique for correcting such pincushion distortion 4, a deflection device as disclosed in, for example, Japanese Unexamined Patent Application Publication No. 75215/1984 has been considered.

That is, the leakage magnetic field of the vertical deflection coil is guided to the funnel side of the deflection device using a cross arm made of a silicon steel plate, and the vertical deflection barrel magnetic field influences the direction of the pink tension magnetic field, thereby correcting left-right pincushion distortion of the raster. It was designed to do this.

Incidentally, the barrel magnetic field 1 shown in FIG. 4 is generated by a pair of toroidally wound vertical deflection coils 6 ₁ , 6 ₂ wound around truncated conical cores 5 ₁ , 5 ₂ as shown in FIG. formed by. In principle, to correct horizontal pincushion distortion of the raster, the vertical deflection magnetic field should be of the pink tension type, and to correct vertical pincushion distortion, the horizontal deflection magnetic field should be of the pink tension type. The convergence of the beam is determined by the total barrel magnetic field of the neck opening side and the funnel opening side of the deflection device, or by the pincushion magnetic field. Furthermore, raster distortion is determined by the convergence of the beam by the magnetic field on the funnel opening side. However, it has also been confirmed that this raster distortion is strongly influenced by the magnetic field on the funnel opening side.

The deflection device devised based on the above-mentioned technology combines truncated conical cores 5 ₁ and 5 ₂ cut in half in the tube axis direction, as shown in FIGS. 7 and 8.
A vertical deflection coil 6 is attached to each of the cores 5 ₁ and 5 ₂ .
₁ and 6 ₂ are toroidally wound, and horizontal deflection coils 8 ₁ and 8 _{2 are installed inside these vertical deflection coils 6 1 and 6 2 via a} separator 7, and furthermore, a pair of vertical deflection coils 6 ₁ and 6 ₂ and this coil 6 ₁ ,
A pair of magnetic field absorbing parts 9 ₁ , 9 ₂ and a magnetic field emitting part _{10 made of silicon steel plates are provided in a part of the cores 5 1 ,} 5 ₂ between 6 2 .
Cross arms ₁₁ 1 _and 11 2 consisting of 1 a, _{10 1} b, 10 ₂ a, and 10 _{2 b} are bonded with adhesives 12 ₁ and 12 ₂ .

The positions where these cross arms 11 ₁ and 11 ₂ are arranged are where the magnetic flux generated by the vertical deflection coil 6 ₁ and the magnetic flux generated by the vertical deflection coil 6 ₂ repel each other, and at this position, The leakage magnetic flux of the magnetic field generated by the vertical deflection coils 6 ₁ and 6 ₂ can be efficiently picked up.

Therefore, the magnetic field emitting parts 10 ₁ a, 10 ₁ b, 10 ₂ a,
10 ₂ b at positions corresponding to the corners of the screen, a magnetic field synchronized with the vertical deflection magnetic field is generated in these magnetic field emitting parts.The magnetic field seen from the screen side of the color picture tube is as shown in Figure 4 or The barrel magnetic field 1 shown in FIG. 6 is corrected in the direction of the pincussion magnetic field shown by the solid line in FIG. 9 (the broken line is the barrel magnetic field).

However, the above-mentioned cross arms 11 ₁ and 11 ₂ are fixed to the cores 5 ₁ and 5 ₂ (only the core 5 ₁ is shown) with an adhesive 12 ₂ as shown for the cross arm 11 ₁ in FIG. During this fixing, it is important that the cross arms 11 ₁ , 11 ₂ and the cores 5 ₁ , 5 ₂ be close to each other and have the same gap.

This consists of cores 5 ₁ , 5 ₂ and cross arms 11 ₁ , 1
Since the material is different from 1 and ₂ , the impedance will change if they come into contact, worsening the characteristics, and if the spacing is different, the correction on the screen will not be uniform. Furthermore, the adhesives 12 ₁ and 12 ₂ have the problem of being easily softened by the heat generated by the deflection coil when the color picture tube is operated.

[Purpose of invention]

The present invention was made in view of the above-mentioned problems, and aims to provide a deflection device in which the distance between the core and vertical deflection coil and the cross arm, especially the magnetic field absorber, is uniform and there is no contact between the core and the vertical deflection coil. It is said that

[Summary of the idea]

This invention is arranged from the neck to the funnel of a color picture tube containing an in-line electron gun and screen, and consists of a vertical deflection coil each toroidally wound around a pair of cores that generate a barrel-shaped deflection magnetic field, and a pink tension-type deflection magnetic field. In a deflection device equipped with a pair of horizontal deflection coils, the cross arm is provided with a spacer made of an insulating material interposed between the cross arm, which is attached to span both of the vertical deflection coils, and the vertical deflection coil and the core. This deflection device is characterized by being bonded to a vertical deflection coil and a core with an adhesive.

[Example of idea]

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

That is, truncated conical cores 5 ₁ and 5 ₂ cut in half in the tube axis direction are combined, and vertical deflection coils 6 ₁ and 6 ₂ are toroidally wound around the cores 5 ₁ and 5 ₂ , respectively. Horizontal deflection coils 8 ₁ , 8 ₂ are installed inside the vertical deflection coils 6 ₁ , 6 ₂ via a separator 7 , and a portion of the pair of vertical deflection coils 6 ₁ , 6 ₂ and the cores 5 1 , 5 2 are installed inside the vertical deflection coils 6 ₁ , 6 _{2 .} A pair of magnetic field absorbing parts 9 ₁ , 9 ₂ and magnetic field emitting parts 10 ₁ a, made of silicon steel plate are formed in a part of the .
The cross arms 11 ₁ and 11 2 consisting of _{10 1 b} , 10 ₂ a, and 10 _{2 b} are bonded with adhesives 12 ₁ and 12 ₂ as in the conventional example, but in this embodiment, the cross arms 11 ₁ , 11 ₂ magnetic field absorption part 9 ₁ ,
It is characterized in that spacers 15 ₁ and 15 2 made of insulating material are interposed between the vertical deflection coils _{9 2} and the vertical deflection coils 6 ₁ and 6 ₂ and the cores 5 _{1 and} 5 ₂ .

The insulating members for the spacers 15 ₁ and 15 ₂ are made of materials that do not soften due to heating of the deflection coil when the color picture tube is operated and have good insulating properties.

By using these spacers 15 ₁ , 15 ₂ , the cross arms 11 ₁ , 11 ₂ and the vertical deflection coil 6
The spacing between ₁ and 6 ₂ and cores 5 ₁ and 5 ₂ is uniform,
It has become possible to obtain a cross-arm deflection device with extremely good characteristics.

It goes without saying that the spacers 15 ₁ and 15 ₂ may have a plate shape, a mesh shape, or the like.

[Effect of idea]

As described above, according to the present invention, it is possible to provide a deflection device with uniform characteristics in which the cross arm is fixed at a uniform position from the vertical deflection coil and core.

[Brief explanation of drawings]

1 to 3 are views showing one embodiment of the deflection device of the present invention, in which FIG. 1 is a partially cutaway side view, FIG. 2 is a plan view seen from the neck side, and FIG. FIG. 4 is an explanatory diagram showing the deflection magnetic field state of the self-convergence method of a color picture tube having an in-line electron gun. FIG. 5 is an explanatory diagram showing raster distortion in the case of FIG. 4. Figure 4 is an explanatory diagram showing the vertical deflection magnetic field in this case, Figure 7 is a plan view of a conventional deflection device with a cross arm seen from the neck side, Figure 8 is an explanatory diagram of the main parts of Figure 7, Figure 9 is the seventh
FIG. 6 is an explanatory diagram of a vertical deflection magnetic field on the screen side of the deflection device shown in the figure. 5 ₁ , 5 ₂ ... core, 6 ₁ , 6 ₂ ... vertical deflection coil, 8 ₁ , 8 ₂ ... horizontal deflection coil, 9 ₁ , 9 ₂ ...
Magnetic field absorption part, 10 ₁ a, 10 ₁ b, 10 ₂ a, 10 ₂
b...Magnetic field emitting part, 11 ₁ , 11 ₂ ...Cross arm, 12 ₁ , 12 ₂ ...Adhesive, 15 ₁ , 15 ₂ ...
Spacer.

Claims (1)

[Scope of utility model registration request] A vertical deflection coil is arranged from the neck to the funnel of the color picture tube containing an in-line electron gun and a screen, and is wound toroidally around a pair of cores that generate a barrel-shaped deflection magnetic field, and a pair of cores that generate a pink-tension deflection magnetic field. In the deflection device comprising a horizontal deflection coil, a spacer made of an insulating member is interposed between a cross arm made of silicon steel plate attached to span both of the vertical deflection coils and the vertical deflection coil and the core. A deflection device characterized in that a cross arm is bonded to the vertical deflection coil and the core with an adhesive.