JPS58216342A - Electron gun for color picture tube - Google Patents

Abstract

PURPOSE:To have one side imperfect circular hole, to which an overlap type opening is unadjoined, opposed to the other side perfect circular hole and thereby improve the resolution of a main electron lens, by installing a circular arcing diaphragm at the neck of each triple interconnecting hole. CONSTITUTION:Openings 23R, 23G and 23B having each bore D1 of more than an opening eccentric radius S1 of a focusing electrode 23 form a triple interconnecting hole while a circular arcing diaphragm 23W is fitly secrued to a groove 23D and the central opening 23G is made into a perfect circular hole of the bore D1. On the other hand, openings 24R, 24G and 24B having each bore D2 of more than an opening eccentric radius S2 of an anode electrode 24 also form a triple interconnecting hole while a circular arcing diaphragm 24W is fitly secured to a groove 24D and outside openings 24R and 24B at both sides are made into a perfect circular hole of the bore D2 each. The overlap comes to a continuous interconnecting hole, and incongruities in a lens action on both horizontal and vertical directions produced by segmental arch parts in an in-line configuration is interpolated and compensated with each other, thus the removal of astigmatism comes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resolution correction in an electron lens of an in-line color picture tube electron gun.

The resolution characteristics of electron guns for picture tubes are mainly limited by the spherical aberration of the electron lens, and in order to obtain high resolution characteristics, it is necessary to reduce the spherical aberration of the electron lens by increasing the aperture of the electrode that constitutes the main electron lens. . In an in-line electron gun in which the three apertures through which the electron beam passes are arranged in a line, simply increasing the diameter of the piezoelectric lens increases the eccentric distance, which is the distance between the apertures, and increases the distance between the entire electron gun. Do not make the picture tube neck diameter too thick. As is well known, an increase in the eccentric distance deteriorates the convergence characteristic for concentrating the two electron beams over the entire area on the phosphor screen, and an increase in the eccentricity diameter increases the deflection power of the picture tube, both of which are undesirable.

Therefore, as shown in Figures 1 and 2, as a method of increasing the aperture of the main electron lens constituent electrode without changing the eccentric distance S1 and neck diameter of the in-line electron gun, the eccentricity of the three apertures is An electrode structure has been proposed in which three apertures having a diameter of 81 or more are arranged in-line by overlapping each other.

FIG. 1 shows a top view of the electrode 11 in which three apertures 11R, 11G, and 11B having an aperture diameter of 81 or more are superimposed on each other and arranged in-line, and each aperture 11B,
. FIG. 2 is a side cross-sectional view of an electron gun assembly in which a bi-potential focus type main electron lens is formed by making the electrodes of the above structure face each other as a focusing electrode G3 and an anode electrode G4. show. As shown in Fig. 1, this main electron lens has a focusing current mGa, an anode, and each hole in the pole G4 is axially symmetrical and is not an independent hole, but a hole with a straight part in the horizontal direction, which is the direction in which the holes are arranged. Because it is circular, the horizontal lens action is weaker than the vertical lens action.
The beam spot on the phosphor screen becomes vertically elongated, resulting in loss of vertical resolution. In particular, since the central aperture has a truncated circular shape with straight edges at both horizontal ends, the beam spot formed by the inner and outer apertures is more vertically elongated, and the vertical resolution of the central main electron lens is The inner and outer main electron lenses deteriorate further.

The present invention has been made in view of the above-mentioned drawbacks, and includes at least one set of electrodes in which two communicating holes are formed by three N-type apertures arranged in-line with a diameter greater than the eccentric distance of the three apertures. In an electron gun in which a piezoelectric lens is formed by facing each other, the center hole of either one of the electrodes is formed into a circular arc at the constriction of the two communicating holes so that it becomes a perfect circular hole with the diameter of the hole. Next, all of the partition walls are installed, and a circular partition wall is installed at the fin of the two communicating holes so that the inner and outer openings of the electrodes facing this are completely circular holes with the same diameter. The present invention provides a color receiver for prenatal blindness in which the resolution characteristics of the main electronic lens are improved by alternately heating one incomplete circular hole and the other complete circular hole, which are not adjacent, to improve the resolution characteristics of the main electronic lens.

Hereinafter, one example of an unconventional process will be explained in detail with reference to the drawings. In order to simplify the explanation, the case where the present invention is applied to the conventional example shown in Fig. 2 and the pi-potential focus type main electron lens of PI& will be explained.

That is, FIG. 3 fa) shows the focusing electrode 2 facing the anode electrode 24.
3, (b) is a side sectional view thereof, FIG. 4(a) is a top view of the anode electrode 24, and (b) is a side sectional view thereof. The focusing electrode 23 has three apertures with an aperture D having an eccentric distance of 81 or more.
Three apertures 23J arranged inline with 1 2
3G and 23B form two communicating holes, and the three communicating holes are raised and surrounded by a protruding edge 23H. Furthermore, the protruding edge 23f
(The fins have been cut to form two pairs of 523n.A circular partition wall 23W with a height of h and a diameter of D1 is fitted and fixed to each of these two pairs of monuments 23D. , the central aperture 23G is a completely circular hole with a diameter D1.Therefore, the inner and outer apertures 23R223B adjacent to the central aperture 23GK have the same aperture D1, and only the overlapping portion on the central aperture 23G side in the inline arrangement direction is missing. It is circular, has a height, and has a groove 23.
Each hole is surrounded by discontinuous protruding edges 23H cut at D, forming a truncated circular hole. The anode electrode 24 facing the focusing electrode 23 has three apertures 24B, 24G, and 24B, 24G, and 24G, each having a diameter of 82 or more and having an eccentric distance of 82 or more.
4B forms two communicating holes, and the three communicating holes are surrounded by a protrusion [24H] having a height h2. Furthermore, the fins of the protruding edge 24H are cut to form two pairs of grooves 24D. Arc-shaped partition walls 24VV having a height, a diameter, and a curvature are fitted and fixed into these two pairs of grooves 24D, respectively, and the inner and outer openings 24
Diameter R, 24B.

It has become completely circular. Naka I caught in Naigaya 11 opening
P: The aperture 24G has a diameter, and both sides in the inline arrangement direction are occluded by the length of the aperture.

Height, richness, discontinuous protrusion cut by groove 24D [
It is a circular hole surrounded by 24H.

Here, the eccentric distance S2 of the anode electrode 24 is generally the same as that of the focusing electrode 2.
Set the eccentric distance S1 thicker than the eccentric distance S1 of 3, mt*
The openings 24J and 24B with the electrical name 24 are connected to the focusing electrode 23.
0 Both outer apertures 23J23B are deflected to the outer side, and the opposing foreign ihl is formed; an equivalent tilted lens is formed in the aperture, and the inner and outer electron beams are electrostatically concentrated into a central electron beam at the center of the screen. It is supposed to be done. Therefore, the off-axis distance S of the anode electrode 24! , its diameter D2% is the focusing electrode 23
The eccentric distance S. , the diameter Dl, etc. are different from each other, which has nothing to do with the gist of non-invention.

The main electron lens composed of electrodes having the above structure has an eccentric distance S1. Without changing S, the aperture diameter, D, has a large aperture larger than the eccentric distance, which is the distance between the inline apertures, so the spherical aberration of the electron lens is small. In this example, the superimposed apertures installed in each electrode and pole are separated from each other by arc-shaped partition walls that form nonadjacent complete circular holes, so that disturbances in the electric field due to mutual interference between the electric fields of adjacent apertures are prevented. It can be prevented. Historically, the greatest feature of the present invention is that the non-adjacent -1 incomplete circular hole of the overlapping type aperture is combined with the opposite complete circular hole. As a result, the overlapping part becomes a continuous communicating hole, and a horizontal hole is created due to the cutout in the inline arrangement direction, which was a drawback of the conventional method in which a linear partition electrode was installed at the border of the adjacent hole. , mismatches in vertical lens action can be matched by mutual interpolation compensation, resulting in the elimination of astigmatism. Therefore, the beam spot on the phosphor screen becomes circular, and the resolution in the vertical and horizontal directions is the same, and the resolution is significantly improved.

Furthermore, the height of the above-mentioned protruding edges 23H and 24H is h.

In order to prevent interference between the electric fields formed in the instantaneous contact openings, it is desirable that the diameter of the instantaneous contact openings be 1/3 or more of the diameter of the openings, D,.

In the explanation in the description, the protruding edge around the two communicating holes formed in the electrode is a groove formed in the fin, but it may also be continuous, and in this case, it is an arcuate partition wall. As shown in Figure 5, 25W has a shape that has a convex part with a width that matches the opposing constrictions, and a height and height of the edge at the protrusion.

Also, in this embodiment, for focusing, the central hole 23G of the camellia 23 and the inner and outer holes 24R924B of the anode electrode 24 facing this are made completely circular holes, but this relationship Q is determined by the focusing electrode and the anode 'φ pole. You can do it the other way around. In this implementation ψ1, a complete circular hole with 9 central openings with overlapping portions at both ends in the inline arrangement direction was installed especially on the focusing electrode side in the curvature field, so the degree of correction of astigmatism of the central beam was determined by this. It is much larger than in the case of @VK implementation, and it is possible to make the resolution characteristics the same as the internal and external beams.

In the above explanation, the present invention was applied to a bi-potential focus type electronic system, but the present invention is not limited to this, and is applicable to a uni-potential focus type electronic system consisting of three electrodes and other multi-stage systems. There is no need to say that 'AFFr' can be used for focused electronic entertainment.

As explained above, according to the present invention, an electronic lens with a large aperture is formed without changing the eccentric distance of the inline arranged apertures, and its spherical aberration and astigmatism are removed to form an inline lens. It becomes possible to significantly improve the resolution characteristics of the electron lens of the picture tube.

[Brief explanation of the drawing]

Figure 1 shows three apertures with diameters greater than the eccentric distance, and one
A top view of a conventional electrode with communication holes arranged in an in-line manner, and the second (2) is an electron gun structure in which the electrodes of the above structure are opposed to each other to form a bipotential focus type electron lens. Side sectional view of Figure 3(a), (
bl is a top view and a side sectional view of a focusing electrode based on one embodiment g1+ of the present invention, FIGS. 4(a) and (b) are a top view and a side sectional view of an anode electrode, and FIG. FIG. 7 shows perspective views of arcuate partition walls based on other embodiments. 11... Electrode waiting for the conventional 1 tatami type communication hole, 1
2...Partition electrode, 23...Acceleration electrode, 24...Anode electrode, 23G, 24J24B.
...Complete circular hole, 23J23B, 24G, old.
・Circular opening, 23W, 24W, 25W...Circular partition wall.

Claims (1)

[Claims] NFC arranged in-line with aperture diameter greater than the distance between holes
In an electron gun in which at least one pair of electrodes each having a plurality of communicating holes formed by a plurality of omitted circular overlapping holes are made to face each other to form a main electron lens, one electrode is adjacent to the other. An electron gun for a color picture tube, characterized in that an arc-shaped partition wall is installed at the constriction of the communicating hole so that the perfect circular hole of the other electrode faces each other in the incomplete circular hole that does not have a circular hole.