KR950005111B1 - Electron gun pole rod - Google Patents

Abstract

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Description

Electron gun electrode

1 is a partially cut perspective view of an electron gun electrode sphere according to an embodiment of the present invention.

2A and 2B are longitudinal and cross-sectional views of the embodiment of FIG.

3 is a partially cut away perspective view of an example of a conventional press molded article of a conventional electron gun electrode sphere.

4A and 4B are longitudinal and cross-sectional views of the electron gun electrode sphere of FIG.

5 is a partially cut away perspective view of another example of a conventional electron gun electrode sphere.

6A and 6B are longitudinal and cross-sectional views of the electron gun electrode sphere of FIG.

* Explanation of symbols for main parts of the drawings

11 external electrode 12 internal electrode

13: external electrode flange 14: welding point

21, 41, 61: common opening 22, 42, 62: independent opening

23, 43: common opening dimensions 24, 44, 64: depth of independent opening

51: large aperture electrode 52: auxiliary electrode

53: large aperture electrode flange portion 54: auxiliary electrode flange portion

55: welding point 65: large aperture electrode height

Industrial use

The present invention relates to an electron gun electrode antibody, and more particularly, to an electron gun electrode sphere of a color cathode ray tube having an inline electron gun.

Conventional technology

In the in-line color cathode ray tube, in order to improve the focus characteristic, the diameter of the main focus lens of the electron gun may be increased to reduce spherical aberration.

For this purpose, for example, as shown in Figs. 3, 4a, and 4b, there is a method in which the electrodes are opposed to the two low voltage side and the high voltage side to be used for the main focus lens. The electrode has a common opening 41 through which three electron beams pass, and three independent openings through which three electron beams separately pass to the rear side of the common opening 41 on the opposite surface side forming the main focus lens. Has 42

By using the electrode for the main focus lens, it is possible to form a large diameter lens with reduced spherical aberration. However, using such a non-rotating symmetric main focus lens generates astigmatism, but by changing the shape of the common opening 41 or the dimension of the independent opening depth 44 on the low voltage side and the high voltage side. Astigmatism is eliminated.

As described above, the electrodes are generally manufactured by integral molding of a press, as shown in FIG.

Problems to be Solved by the Invention

The manufacture of the electrode by the conventional press integral molding described above is difficult because the shape of the electrode is complicated, and therefore the manufacturing cost increases.

In addition, the common opening dimensions 43 and the independent opening depths 44 require several microns of precision in order to eliminate astigmatism as described above, but the deep-drawing processing as shown in FIG. There is considerable difficulty in realizing it with the accompanying press integral molding.

Therefore, as an improved method, a manufacturing method was considered as shown in Figs. 5, 6a and 6b. That is, the electrode having the complex opening shape is divided into two parts by the large aperture electrode 51 having only the common opening 61 at the top of the cup-shaped electrode and the auxiliary electrode 52 having only the independent opening 62. The large aperture part 51 is overlapped with the electrode 52, and both are welded at the flange part. By dividing the electrode into two, each electrode shape becomes a very simple shape and is easy to process.

On the other hand, when the welding method also employs a non-pressurized method such as, for example, laser welding, accurate positioning of the large aperture electrode 51 and the auxiliary electrode 52 also becomes relatively easy.

However, in the second method described above, the independent opening depth 64 is determined by the large aperture electrode height 65. It is quite difficult to realize the large aperture electrode height 65 with a press deep drawing process with a precision of about several microns, even if there is no difficulty as described above with the press integral molding.

The reduction in the precision of the large aperture electrode height 65, i.e., the dimension of the independent opening depth 64, has the drawback of deteriorating the astigmatism characteristic described above and degrading the resolution quality of the color cathode ray tube.

An object of the present invention is to provide an electron gun electrode sphere of a color cathode ray tube excellent in resolution quality.

Means to solve the problem

The electron gun electrode sphere of the present invention has a common opening portion through which three electron beams pass through the top portion, a comb-shaped external electrode having a flange portion at the end, and three independent passages through which three electron beams respectively pass through the top portion. A cup-shaped inner electrode having an opening, and the common opening and the independent opening are disposed to face each other so that the outer electrode and the inner electrode are integrated with each other, and a tip of the inner electrode is positioned at the top of the outer electrode, and the inner electrode In the electron gun electrode sphere wherein the inner electrode is inserted into the outer electrode so that the end of the inner electrode is located on the flange side of the outer electrode, and the outer surface of the side wall portion of the inner electrode and the inner surface of the side wall portion of the outer electrode are welded. The common opening of the external electrode is a cut-shaped opening that is not throttled and the internal electrode is The stand-opening is characterized in that an opening of the throttle milled edge protruding.

Example

Next, an embodiment of the present invention will be described with reference to the drawings.

1 is a partially cut away perspective view of an electron gun electrode sphere according to an embodiment of the present invention, and FIGS. 2A and 2B are longitudinal and cross-sectional views of the embodiment of FIG.

As shown in FIGS. 1, 2a, and 2b, the external electrode 11 has a common opening 21 through which three electron beams pass through the top surface of the electrode, and the electrode is used at the side end. In the case of assembling the electron lens, the electrode is a cup-shaped electrode having an outer electrode flange portion 13 to be inserted into an insulating post to hold the electrode. It is a cup-shaped electrode with three independent openings 22 passing through.

It should be noted here that the common opening 21 is a cut-shaped opening cut off the top surface of the external electrode as shown in FIGS. 1, 2A, and 2B, whereas the independent opening 22 is It is an opening having an edge protruding portion in which the bottom surface of the internal electrode is drawn. In general, compared to the throttle machining, the cut-shaped opening by cutting is easy to achieve high precision and is suitable for precisely positioning the position of the counter electrode with the counter electrode as the external electrode. In addition, since the independent opening has a smaller diameter compared to the common opening, the axial machining is also convenient, and it is also good for the alignment of the electron gun as well as the advantages in terms of strength.

The inner electrode 12 is fixed to a welding point 14 by fixing the tip of the electrode inside the outer electrode 11 and fixing it at a position where a predetermined dimension is accurately obtained. Since the precision of the dimension of the independent opening depth 24 is determined only by the positional relationship between the outer electrode 11 and the inner electrode 12, managing the positioning accuracy of both at the time of welding can produce a highly accurate product stably. have.

As described above, the present invention has a cup-shaped external electrode having a flange portion and a cup-shaped inner electrode whose outer shape is smaller than the inner diameter of the outer electrode and is fitted into the outer electrode, and the positional relationship between both of the inner electrodes is inserted into the outer electrode. Can be provided in a predetermined relationship and welded to each side wall to realize a predetermined electrode shape, thereby facilitating a manufacturing method and increasing the accuracy of the electrode dimension, thereby improving the resolution quality. .

Claims (1)

It has a common opening 21 through which three electron beams pass at the top, and has a cup-shaped external electrode 11 having a flange 13 at its end, and three electron beams at the top. It has a cup-shaped inner electrode 12 having three independent openings 22, and the common opening 21 and the independent opening 22 are disposed to face each other so that the external electrode 11 and the internal electrode 120 are integrated. The inner corner of the inner electrode 12 is located at the corner of the outer electrode 11 and the end of the inner electrode 12 is located at the flange portion 13 side of the outer electrode 11. In the hypoallergenic electrode sphere in which an electrode 12 is inserted into the outer electrode 11 and the outer surface of the side wall portion of the inner electrode 12 and the inner surface of the side wall portion of the outer electrode 11 are welded 14. The cut of the common opening 21 of the external electrode 11 is not cut. Electron aperture electrode sphere, characterized in that the opening of the inner electrode (12) of the inner electrode (12) is an opening in the shape of the protruding edge protruding.