JPH03254051A - Electron gun electrode structure for color picture tube - Google Patents

Abstract

PURPOSE:To reduce the number of parts for an electrode structure of an electron gun and enhance its assembling accuracy by coupling two cup-shaped electrodes coaxially, and forming three electron beam passage holes in either of these electrodes on its coupled side. CONSTITUTION:Two cup-shaped electrodes 13, 14 and 23, 24 are coupled coaxially, and thereby the number of parts used and the man-hours for assembly are reduced. Three electron beam passage holes 14a-14c and 23a-23c are formed in respective cup-shaped electrodes 14 and 23. This enhances locational dimensions l1, l2 of the electron beam passage holes 14a-14c and 23a-23c, and they are free from risk of dislocation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electron gun electrode structure for a color picture tube, and particularly to the structure of a main lens electrode structure.

[Conventional technology]

Generally, in a color picture tube, when the main lens is equipped with a lens focusing device, lens magnification and spherical aberration are reduced, and focus characteristics are improved. One way to weaken this focusing effect is to
This is to enlarge the aperture (effective diameter) of the main lens.

Conventionally, as an electrode structure with an increased effective diameter of the main lens,
For example, one disclosed in Japanese Unexamined Patent Publication No. 59-215640 is known. In this structure, as shown in FIG. 4, inside the two cup-shaped electrodes 1.2, plate-shaped electrodes 3.4 are arranged 4.1. , g, is slightly moved back and fixed. The plate-shaped electrode 3.4 has electron beam passage holes 3a, 4a formed in the center thereof, and the left and right sides thereof are formed in a semicircular or semielliptical shape. Then, left and right electron beam passing holes 3b, 3c and 4b are formed on both left and right sides of the plate-shaped electrode 3.4 and the inner wall of the cup-shaped electrode 1.2, respectively.
4c is formed. Each of the cup-shaped electrodes 1.2 has one large electron beam passage hole 1a on the opposite end surface.
2a is shaped.

Further, the cup-shaped electrode 2 is provided with a cup-shaped electrode 5 on the end surface opposite to the electron beam passage hole 2a, and the cup-shaped electrode 5 has three electron beam passage holes 5a and 5b.

It has 5c. The support portion of the cup-shaped electrode 1.2.5 is embedded in the bead glass 6 to form an integral structure.

This structure has a plate-shaped electrode 3.2 inside a cup-shaped electrode 1.2.
4 is fixed, it is necessary to make the outer diameter of the plate-shaped electrode 3.4 smaller than the inner diameter of the cup-shaped electrode 1.2, and in this case,
When fixed by laser welding or the like, the cup-shaped electrode 1.2 is deformed due to the gap between the two, and the electron beam passage hole 3a~
3c, 4a to 4C center axis deviation occurs.

For this reason, several types of fitting combinations of the cup-shaped electrode 1.2 and the plate-shaped electrode 3.4 were prepared, and the amount of retraction of the plate-shaped electrode 3.4 -
We have prepared multiple assembly jigs for adjusting -13t and -13t to improve accuracy.

As a method for solving such problems, for example, a method disclosed in Japanese Patent Laid-Open No. 63-313454 is known.

As shown in FIG. 5, this structure consists of two cup-shaped electrodes 11.12 and 21.22, each replacing the cup-shaped electrode 1.2 shown in FIG. and three parts 11.31.12 and 21.41.22
They are each welded and joined together.

In this way, two cup-shaped electrodes 11.12 and 21.
Since the plate-shaped electrodes 31 and 41 are arranged between the cup-shaped electrodes 11.21 and 21.22, the position and dimensions of the plate-shaped electrodes 31.41 are constant, and the cup-shaped electrodes 11.21 and 21.22 are
There is no deformation when they are combined, and a distortion-free main lens can be formed. Furthermore, the complexity of assembly work is also improved.

[Problem to be solved by the invention]

The above prior art consists of three parts 11.31.12 or 21.
．． 41.22, the number of parts and assembly man-hours increase, leading to high costs.

Further, when the plate electrode 31 or 41 is coupled to the cup electrode 11.12 or 21.22, there is a problem that the electron beam passing holes 31a to 31c or 41a to 41c of the plate electrode 31 or 41 are misaligned. .

An object of the present invention is to provide an electron gun electrode assembly for a color picture tube that can reduce the number of parts and improve assembly accuracy.

[Means to solve the problem]

The above object is achieved by coaxially coupling two cup-shaped electrodes and forming three electron beam passage holes on the coupling portion side of one of the cup-shaped electrodes.

[Effect]

Since there are only two cup-shaped electrodes, the number of parts and assembly steps are reduced. In addition, since the three electron beam passing holes are formed in one cup-shaped electrode, the positional dimension of the three electron beam passing holes in the central axis direction is improved, and positional deviation of the electron beam passing holes does not occur. .

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. Fifth
As shown in FIG. 1, the combination of the cup-shaped electrode 11.12 and the plate-shaped electrode 31 and the combination of the cup-shaped electrode 21.22 and the plate-shaped electrode 41 are as shown in FIG.
14 and 23.24.

A large electron beam passage hole 13a is formed in the cup-shaped electrode 13 on the side where it is connected to the cup-shaped electrode 14. The cup-shaped electrode 14 has three electron beam passing holes 14a, 14b, 14c on the side where it is connected to the cup-shaped electrode 13.
is formed, and one electron beam passage hole 14d is formed on the cup-shaped electrode 23 side. Here, from the end face of the electron beam passage hole 14d, the electron beam passage holes 14a to 1
The dimension of 4c to the end face is l.

The cup-shaped electrodes 13 and 14 are integrally formed by being fixed by welding at four points on the outer periphery of the joint portion.

Similar to the cup-shaped electrode 14, the cup-shaped electrode 23 has three electron beam passing holes 2 on the side where it is connected to the cup-shaped electrode 24.
3 a s 23 b -, 23 c are formed. Roughly one electron beam passage hole 23 d is formed in the cup-shaped electrode 14 @. Here, the dimension from the end surface of the electron beam passage hole 23d to the end surface of the electron beam passage holes 23a to 23c is formed to be P. The cup-shaped electrode 24 has three electron beam passage holes 24a, 124b and 24c formed on the end surface opposite to the cup-shaped electrode 23. and,
The cup-shaped electrodes 23 and 24 are integrally formed by being fixed by welding at four points on the outer periphery of the joint portion.

In this way, since there are more than two cup-shaped electrodes 13 and 14 and 23 and 24, the number of parts and the number of assembly steps are reduced.

Furthermore, since three electron beam passing holes 14a to 14c and 23a to 23c are formed in the cup-shaped electrodes 14 and 23, the electron beam passing holes 14a to 14c and 23a to 2
The positional dimensions n, , A of 3C are improved, and positional deviations of the electron beam passing holes 14a to 14c and 23a to 23C do not occur.

FIG. 2 shows another embodiment of the invention. In the above embodiment, one electron beam passing hole 13a is provided in the cup-shaped electrode 13.
, and three electron beam passing holes 14a to 14c were formed in the cup-shaped electrode 14.However, in this embodiment, on the contrary, three electron beam passing holes 25a, 2 are formed in the cup-shaped electrode 25.
5b and 25c, and one thick electron beam passage hole 26a is formed in the cup-shaped electrode 26. Further, in the cup-shaped electrode 26, one large electron beam passage hole 26b is formed in the cup-shaped electrode 23@. Even if formed in this way, the same effects as in the embodiment described above can be obtained.

Next, a method for manufacturing the cup-shaped electrode 14.23 shown in FIG. 1 will be explained with reference to FIG. First, as shown in FIG. 3fa), a thin material having a thickness of approximately 0.3 mm is punched out into a shape for collecting electricity to form a thin plate blank 50. Next, as shown in the same figure),
A cup-shaped part 51 is obtained by drawing. Thereafter, as shown in FIG. The 7-run part 51d is trimmed to form a cup-shaped part 52 as shown in ) in the figure.

Next, the end face of the cup-shaped part 52 is curled and the end face of the cup-shaped part 52 is curled.
), the cup-shaped electrode 14 or 23 is completed.

Although the explanation is omitted, the cup-shaped electrode 2 shown in FIG.
It goes without saying that No. 5 can also be molded by the same method.

〔Effect of the invention〕

According to the present invention, since the plate-shaped component is made up of two cup electrodes and is not required, the number of components and assembly man-hours are reduced, and costs can be reduced. In addition, since the three electron beam passage holes of the conventional plate-shaped electrode are formed in the cup-shaped electrode, the positional dimension of the three electron beam passage holes in the central axis direction is improved, and the position of the electron beam passage hole is improved. No deviation occurs.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, (a) is a sectional view, (a) is a cross-sectional view, (
b) is a central sectional view of (at), FIG. 2 shows another embodiment of the present invention, (a) is a sectional view, W) is a central sectional view of (a), and FIGS. 3(a) to tel. 1 is a process diagram showing the method for manufacturing the cup-shaped electrode, FIG. 4 is a conventional example, (a) is a sectional view, Q)) is a central sectional view of (at), and FIG. 5 is a conventional example. An example of 0) is shown, and 0) is a cross-sectional view, and 0) is a central sectional view. 13-16.23.24...Cup-shaped electrode, 14a-
14e, 15a to 15c, 23a to 23c...electron beam passage holes. One-\

Claims (1)

[Claims] An electron gun for a color picture tube, characterized in that one or two cup-shaped electrodes are coaxially coupled, and three electron beam passage holes are formed on the coupling part side of one of the cup-shaped electrodes. Electrode structure.