JPS58220342A - Deflector - Google Patents

Abstract

PURPOSE:To effectively compensate right and left pincushion distortions and obtain distortion-less raster by setting the arranging direction of electron guns set in in-line arrangement in the deflector of color picture tube, as the reference line and by respectively arranging two kinds of field adjusting apparatuses with different pole-to-pole distances on the screen side at both sides of such reference line the deflector as attachments to said deflector. CONSTITUTION:The field adjusting apparatuses consisting of two kinds of magnets 2a and 2b different in their pole-to-pole distances are respectively provided on the same side as the horizontal deflection coils 3 arranged at the upper and lower sides of the reference line H-H of the deflector 1, namely at the upper and lower screen of the reference line. The magnet 2b having the pole-to-pole distance shorter than that of the magnet 2a has a shorter effective length. Therefore, it works in such a manner as pulling the area near the vertical axis of raster to the upper and lower sides and mainly executes the upper and lower pincushion type compensation. Therefore, the raster having compensated distortion as indicated in the figure can be obtained by two kinds of field adjusting apparatuses having different pole-to-pole distances.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a deflection device C2 for a color picture tube having an in-line array electron gun in which three electron beams are arranged in a row in the horizontal direction.

Technical Background and Problems of the Invention In a color picture tube deflection device having an in-line array electron gun in which three electron beams are arranged horizontally in one row (two arrays), the horizontal deflection coil is replaced by a saddle type 1: and the vertical deflection coil is Self-convergence can be achieved by making the toroidal type and adjusting the winding distribution of those coils so that the horizontal deflection magnetic field from the horizontal deflection coil becomes a bottle cushion type (2. The vertical deflection magnetic field from the vertical deflection coil takes a barrel type). In such a self-convergence type deflection device, since the horizontal deflection magnetic field is a bottle cushion type, when the in-line arrangement direction of the electron gun is the reference line and this reference line is in the horizontal direction, Upper and lower pincushion distortion is effectively corrected.

However, since the vertical deflection magnetic field has a barrel shape due to the convergence characteristic, it actually promotes the distortion, and a raster with left and right pincushion distortion is projected as shown in Figure 1. . In order to correct such raster distortion using a deflection device, it is necessary to make the screen-side magnetic field shape of the vertical deflection magnetic field into a bottle cushion shape. has been put into practical use. However, in color picture tubes with flattened screens or wider deflection angles, vertical pincushion distortion and left/right pincushion distortion become larger, and the shape of the horizontal and vertical deflection magnetic fields on the screen side becomes stronger in the form of a bottle cushion. However, it is difficult to do so using conventional methods.

OBJECTS OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a deflection device that easily corrects the raster distortion.

Summary of the Invention The present invention uses the arrangement direction of in-line electron guns as a reference line, and arranges two types of magnetic field adjustment devices with different magnetic pole lengths on the screen sides on both sides of this reference line in a deflection device. This is a deflection device that effectively corrects the left-right pincushion distortion of the self-convergence system when the reference line is set in the horizontal direction, and provides distortion-free raster.

Examples of the invention The present invention will be explained in detail below.

FIGS. 2(al) and (b) are front and side views showing one embodiment of the deflection device of the present invention, and the reference line H-H in the arrangement direction of the in-line array electron gun is parallel to the plane of the paper in FIG. 2(al). In Fig. 2, the magnetic pole length is placed on the same side as the water hand deflection coil (3) placed above and below the reference line H-H of the deflection device (1), that is, on the screen side of the reference line. A magnetic field adjusting device consisting of two different persimmon type magnets (2a) and (2b) is attached respectively.This magnetic field adjusting device brings about the following effects.

That is, first, the bottle-cushion type magnetic field formed by the magnet (2a) with a long distance between the magnetic poles acts to correct left-right pincushion distortion. This correction amount is 2M
) can be selected as appropriate depending on the effective length, mounting position, and magnetic field strength. This magnet (2a) corrects left and right pincushion distortion in the direction shown by the solid line in Figure 3, but at this time,
The horizontal lines at the top and bottom of the screen are also influenced by the magnetic field (2a), so they change in a direction that corrects the vertical pincushion distortion.

However, in a color picture tube in which one surface is made flatter or has a wider deflection angle, the amount of correction is insufficient, resulting in a raster in which vertical pincushion distortion remains.

Therefore, magnets (2b) whose length between magnetic poles is shorter than those of magnets (2a) have longer effective lengths, so they work to pull the raster vertical axis up and down, and mainly perform upper and lower pincushion-type corrections. Therefore, by using two types of magnetic field adjustment devices with different lengths between two equal magnetic poles, a corrected raster of two rays can be obtained as shown in FIG.

In this case, if the upper and lower sides after left and right pincushion distortion correction are barrel-shaped (= means that the magnetic pole directions of the two types of magnets with different magnetic pole lengths are opposite to each other (: it is preferable to arrange the magnets).

Figure 'M45 shows another embodiment of the present invention, in which the length between the magnetic poles is long b) (magnet) (2a) and short magnet)
(2b) are integrally molded into a convex shape.

When the magnetic poles are in the same direction, a simpler magnetic field adjustment device can be obtained. Figures 6 to 8 show further embodiments of the present invention. The rear side 1 of the flare part of (3) is arranged. Figure 7 shows the outer end i of the flare part of the horizontal deflection coil (3). Figure 8 shows the arrangement between the magnetic poles. Two types of magnetic field adjusting devices with different lengths are arranged in the opposite direction to that shown in Fig. 2 (ml), that is, the one with the shorter length between the magnetic poles is arranged on the tube axis side. It goes without saying that the same effect as shown in Figure C: $2 can also be obtained.

Effects of the Invention As described above, according to the present invention, when the arrangement of the in-line electron guns is used as a reference line, and this reference line is in the horizontal direction, the left and right pincushion distortion is corrected by the magnetic field adjusting device having a long distance between magnetic poles.
The residual vertical bias can be corrected by a magnetic field adjustment device with a short length between magnetic poles, and by selecting the effective length, installation position, and magnetic field strength of two types of magnetic field adjustment devices with different lengths between two equal magnetic poles, the left and right can be adjusted. It is also possible to easily accommodate deflection device ports having different vertical distortion correction amounts and correction force directions to obtain distortion-free rasters.

[Brief explanation of the drawing]

Fig. M1 is a schematic diagram showing a typical raster shape of the self-convergence system, and Fig. 82 (a) and Fig. 2 (b) are a schematic front view and side view of the main parts showing a simple example of the deflection device of the present invention. , 3 and 4 show the deflection device ('-
FIG. 5 is a schematic front view of Senkyo showing another embodiment of the present invention, and FIGS. 6 to 8 are schematic diagrams for explaining the raster shape of another embodiment of the present invention. FIG. 2 is a schematic side view and a front view of main parts shown in FIG. (1)... Deflection device (2a), (2b
)...Magnetic field JM adjustment device (3)...Horizontal deflection coil agent Patent attorney Noriyuki Chika (and 1 other person) □ Figure 1. Figure 2 Figure 8 Figure 4
"F= Tsukasa Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] 1) A horizontal deflection coil (two horizontal deflection magnetic fields in a bottle cushion type
In a barrel-shaped self-convergence type deflection device with a vertical deflection magnetic field generated by a vertical deflection coil, the in-line arrangement direction of the deflection device is used as a reference line, and a distance between magnetic poles is set on the screen side of the color picture tube on both sides of this reference line. A deflection device comprising two different types of magnetic field adjusting devices. 2) The deflection device according to claim 1, wherein the two types of external magnetic field devices having different magnetic pole lengths are integrally formed into a convex shape. 3) The first aspect of the present invention is characterized in that the magnetic poles of the two types of magnetic field adjustment devices having different magnetic pole lengths are arranged on the same side.
Deflection device as described in section. 4) (
2. A deflection device according to claim 1, characterized in that 6% are arranged oppositely to each other.