JPS60241625A - Manufacture of electron gun - Google Patents

Abstract

PURPOSE:To manufacture an electron gun with a method suitable for mass-production by dividing the auxiliary electrode into two sections, supporting and fixing respectively the other electrode and auxiliary electrodes with electrode supports and intergrating auxiliary electrodes divided into two sections by the welding to form an electron gun. CONSTITUTION:An auxiliary electrode 26a is put into a jig with the reference to side bars 55a-55d, third grid electrodes 23b, 23a, a spacer 53, a second grid 12, a spacer 54 and a first grid 11 are sequentially put into the jig with reference to center bars 50a-50c, respective electrodes are rigidly fixed temporarily by applying an adequate force from the upper part, and glass electrode supports 2a which is partly dossolved by heat is buried to a part of respective electrodes for fixing them. The same process is conducted to the other auxiliary electrode 26b. Two sections of electron gun thus assembled are put into a jig having three center bars 50a-59c and four side bars 55a-55d together with the jig 56 in such a way that the auxiliary electrodes 26a, 26b are joined and the flange 104 of auxiliary electrodes are fixed by welding. Thereby an integrated electron gun can be formed.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a method of manufacturing an electron gun for focusing at least one, preferably more, electron beams.

[Technical background of the invention and its problems]

A cathode ray tube is equipped with at least one electron gun,
This electron gun forms an electron beam spot on a predetermined target, and one of the extremely important factors that determines the performance of a cathode ray tube is the spot diameter of the electron beam on the target. It goes without saying that the smaller the spot diameter on the target, the more desirable it is.
This spot diameter is determined by the performance of the electron gun. Generally, an electron gun consists of a part that generates an electron beam and a main lens part that accelerates and focuses the electron beam.One effective means of improving the performance of an electron gun is to improve the performance of the main lens part. .

Most of the main lens parts are electrostatic lenses, which are formed by coaxially arranging a plurality of electrodes having electron beam passage apertures and applying a predetermined potential. There are several types of such electrostatic lenses depending on the electrode configuration, but basically they are made by increasing the electrode aperture diameter to form a large-diameter lens, or by increasing the distance between the electrodes to achieve a gradual potential change. Lens performance can be improved by forming a long focal length lens.

However, since electron guns for cathode ray tubes are generally used enclosed in a thin glass cylinder (neck), first the aperture of the electrodes, that is, the diameter of the lens, is physically limited, and then the focused electric field formed between the electrodes is The distance between the electrodes is limited to avoid being affected by the electric field. Particularly when a plurality of electron guns are used in a line, such as in a color picture tube, the smaller the electron gun interval 8g is, the easier it is to converge the plurality of beams, and it is advantageous in terms of deflection power. Therefore, the opening of the electrode has to be further reduced by /J%.

Therefore, while keeping the electron gun spacing (8g) small, the electrode aperture is made as large as possible to widen the distance between the electrodes, and an auxiliary electrode is provided between the electrodes to eliminate the influence of the undesired electric field on the inner wall of the neck. An electron gun is considered. In such an electron gun, the aperture diameter of the auxiliary electrode must be set sufficiently large in order to eliminate the influence of the electric field of the auxiliary electrode. Therefore, we would like to make the aperture diameter of the auxiliary electrode as large as the inner wall of the neck to make the distance between the electrodes sufficiently wide and create a high-performance electron gun, but in reality, the aperture diameter of the auxiliary electrode should be made as large as the inner wall of the neck. Therefore, the distance between the electrodes cannot be made sufficiently wide. This is because the electrode supports for supporting the electrodes are enclosed in the neck like the electrodes, and the aperture diameter of the auxiliary electrode is actually limited by the distance between the electrode supports. Therefore, an electron gun can be considered in which the electrode support is divided into two by the auxiliary electrode, and the auxiliary electrode has a sufficiently large aperture diameter.

However, since the aperture diameter and shape of the auxiliary electrode are significantly different from the aperture diameters and shapes of other electrodes, it is extremely difficult to manufacture such an electron gun using conventional manufacturing methods.

[Purpose of the invention]

An object of the present invention is to provide a method for manufacturing an electron gun having the above structure that is highly suitable for mass production.

[Summary of the invention]

In the present invention, the auxiliary electrode is divided into two parts, each other electrode and the auxiliary electrode are supported and fixed on an electrode support, and then the two halves of the auxiliary electrode are welded and fixed to form an integrated electron gun. .

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 1 shows an example of an electron gun for a color picture tube manufactured by implementing the present invention, Figure 2 is an assembly diagram of a conventional electron gun according to a conventional method, and Figures 3 and 4 are similar to Figure 1. FIGS. 1 to 4 are assembly diagrams of the illustrated electron gun according to the embodiment manufacturing method of the present invention.
In the figures, the same members are indicated by the same numbers. In FIG. 1, FIG. 3, and FIG. 4, the electron gun (1) has a plurality of electrodes, which will be described later.
It has a plurality of electrode supports (2a) and (2b) that support these. The plurality of electrodes generate three electron beams (3a) and (3b) that strike the phosphor layers of red, green, and blue colors.
, (3c) three heaters (6a) for generating
, (6b), (6c) are arranged in a row, and cathodes (7a), (9b), (9c)
) The first grid Qυ, the second grid (12, the third grid α3, the fourth grid α , convergence electrode a9
and the third grid (131) and the fourth grid (14)
An auxiliary electrode αe having one large opening located between the two electrodes is implanted and fixedly supported by the insulating supports (2a) and (2b). The first grid (11) and the second grid α are flat electrodes placed close together, and the third grid a3 is connected to the second grid (two electrodes placed close to one and connected to each other).
The fourth grid (L4) is composed of two cup-shaped electrodes (23a) and (23b) arranged at a predetermined distance from the third grid 0 and connected to each other.
24a) and (24b), and a convergence electrode (19 is the fourth group, consisting of one cup-shaped electrode (25a) fixed to the lid α4 by welding. The bottom of each cup-shaped electrode of each grid electrode and convergence electrode The planar and flat electrodes each have three electrodes fitted to each electron beam.
A circular electron beam passage hole is provided. The beam passage holes in the first grid I and the second grid α are relatively small, and the beam passage hole (33 m) on the side facing the second grid @ of the third grid Q3.

(33b) and (33C) are slightly larger;
(34b) and (34c) have the same diameter and are relatively large, and the beam passage hole of the convergence electrode housing 9 is smaller than that. The auxiliary electrodes are two cylindrical electrodes (26a).
, (26b), and these electrodes are cup-shaped electrodes (23b) of the third grid 0 and the fourth grid I, respectively.
(24a). One such auxiliary electrode is shown in FIG. The auxiliary electrode (26a) shown in FIG.
03) has 1 (104). It also has a strap (105) at one end that is inserted into the electrode support. Such flanges and straps can also be formed separately. A part of another grid fits into the track field-shaped aperture (101) side of the auxiliary electrode shown in FIG. 5, and the circular aperture (102) side fits into the circular aperture of another auxiliary electrode. It is set to join. In addition, a bulb spacer ←η is attached to the convergence electrode (I!9) that applies a high voltage of about 25 KV to the anode terminal (not shown). Such an electron gun is installed inside the neck of a thin glass cylinder. The stem pin αl is placed in the lower part of the neck.This stem pin αl is connected to the electron gun (
1) and the convergence electrode (19,
Each electrode potential other than the fourth grid (14) can be supplied from the outside through the stem bin 4.

Now, in order to explain the method for manufacturing the electron gun shown in FIG. 1, a method for manufacturing a normal electron gun will be explained. The electron gun shown in FIG. 2 is a sectional view illustrating a method of assembling an ordinary electron gun for a color picture tube having a pi-potential type lens. The electrode structure of this electron gun is 1L unlike the electron gun shown in FIG. 1 except that it does not have an auxiliary electrode. Therefore, the electrode support is not divided into two along the electron beam traveling direction but is a continuous support. The manufacturing of such an electron gun involves 3 steps as shown in Figure 3.
A jig 6 having three center rods (50a), (50b), and (50c) aligned with the electron beam passage holes.
Using υ, the fourth grid electrode (24b), (24a),
Spacer function, third grid electrode (23b), (23a)
The electrodes are stacked one by one, and force is applied from the top to firmly fix each electrode.
2) is embedded in a part of each electrode, and then the assembled electron gun is removed from the jig and the spacer between each grid is removed. Figure 2 middle (to), (b)
is also a spacer.

However, such a conventional electron gun manufacturing method cannot be used for the electron gun shown in FIG. That is, since the opening diameter and shape of the auxiliary electrode e are significantly different from the opening diameter and shape of the third grid α3 and the fourth grid α4, the auxiliary electrode cannot be fixed only with the center rod shown in FIG. Further, since the auxiliary electrode covers part of the third and fourth grids, it is difficult to set the distance between the third grid (13) and the fourth grid.

Therefore, in the present invention, as shown in Figs. 3 and 4, three center rods (50a) + (50b), (50c) and four side rods (55a), (55b), (s5c) are used.
, (s5d) using a jig f:4 having an auxiliary electrode (L
It is divided into two pieces with e as the border, and each piece is assembled separately.

That is, in FIG. 3, one auxiliary electrode (26a) is connected to the side rod (
55a) to (55d) as reference points, and then place the third grid electrodes (23b), (23a), spacer (b), second grid α2, spacer (b),
Center rod (5Qa) to (50
c) was placed in a jig as a reference, and as in the conventional method shown in Figure 2, an appropriate force was applied from above to temporarily fix each electrode firmly, and the glass electrodes were partially melted. Support (
2a) is embedded and fixed in a part of each electrode.

After that, remove it from the jig and pull out the spacer between each grid.

At this time, the bottoms of the jigs are different so that the auxiliary electrode and the third grid electrode can be placed at appropriate positions.

Further, the auxiliary electrode is also temporarily fixed by an appropriate force in the same way as the other electrodes such as the third grid. On the other hand, in Figure 4,
The other auxiliary electrode (26b) is connected to the side electrode (55a) to (
55d) as a reference, and then put the fourth grid electrodes (24a) and (24b) into the center rod (50a).
) to (50G) are placed in a jig trowel as a reference, each electrode is fixed with an electrode support (2b) in the same manner as in the case of FIG. 3, and then removed from the jig. The two parts of the electron gun assembled in this way are similar to the jig (to), which has three center rods and four side rods, and two auxiliary electrodes (26a) and (26b). The 7-rank portions (104) of the auxiliary electrodes are inserted so as to be joined together, and the joined 7-rank portions (104) of the auxiliary electrodes are welded and fixed to form an integrated electron gun. At this time, the jig for integrating the electron gun, which was manufactured in two parts, and Figure 3,
The nine jigs shown in FIG. 4 may be the same or may be provided separately.

In the above embodiment, an auxiliary electrode is inserted into a pi-potential type lens, and an electrode support is divided into parts with the auxiliary electrode part as a boundary. The present invention is applicable to electron guns in which an auxiliary electrode is inserted into a shaped lens, a geodora potential type lens, a periodic potential type lens, or a tripotential type lens, and the electrode support is separated by the auxiliary electrode part. can do.

Furthermore, in the embodiment described above, the aperture of the auxiliary electrode is one large aperture, which has a completely different aperture shape from the three beam passing holes of the other electrodes, but the present invention is not limited to this. The auxiliary electrode can also be applied when it has the same beam passage hole as the other electrodes.

Further, in the above embodiment, the three electron guns are integrated in a row in the horizontal direction, but the present invention is not limited to this, and the present invention is not limited to this, and the present invention can also be applied to a structure in which three electron guns are arranged in an equilateral triangle shape. The present invention can be applied to any electron gun in which the electrode support is separated by an electrode that has several electron guns arranged therein or one electron gun structure.

〔Effect of the invention〕

As described above, according to the present invention, in manufacturing an electron gun in which the electrode support body is divided into parts with a certain electrode as a boundary, the electron gun is manufactured by dividing the electron gun into two parts with the electrode as a boundary, and then the cough electrode is joined. By forming a fixed and integrated electron gun, it is possible to manufacture the electron gun extremely easily, and it is possible to provide a method for manufacturing an electron gun that is highly mass-producible.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing an example of an electron gun manufactured by implementing the present invention, Fig. 2 is an exploded perspective view for explaining the assembly of a conventional electron gun, and Figs. FIG. 5 is an exploded perspective view for explaining the assembly of the embodiment of the invention, and FIG. 5 is a perspective view of one of the electrodes of the electron gun shown in FIG. (1) - Electron gun (2), (2a), (2b) -
Electrode support αJ...Third grid I...Fourth grid tte/Auxiliary electrodes (50a), (50b), (50c) - Center rod (55a), (55b), (55c), (55d) -
・Side rod (to)...Jig agent attorney Keisuke Shinori Chika (1 idiot) Figure 1 Otsu C puC

Claims (1)

[Claims] At least a first grid along the electron beam traveling direction,
An electron gun comprising three grids, a second grid and a third grid, and an electrode support supporting each of the grids divided into two along the electron beam traveling direction with the second grid as a border, and In the method for manufacturing an electron gun, the second grid is formed by at least two electrodes,
means for fixedly supporting one electrode of the first grid and the second grid by an electrode support; means for fixedly supporting the other electrode of the second grid and the third grid by the electrode support; The divided electrodes of the grid are joined and fixed to form the first grid. A method for manufacturing an electron gun, comprising means for integrating a second grid and a third grid.