JPH03210735A - Color cathode-ray tube - Google Patents

Abstract

PURPOSE:To improve focusing property by suppressing deformation of an electrode with a beading jig having a structural shape matching with the electrode at the time of fitting each electrode into a mandrel of a beading jig. CONSTITUTION:A jig material 14 is used for inserting a mandrel 12 into an electrode 11. A guide hole 24 to which the mandrel 12 is led, a groove 25 for holding and positioning the electrode 11, and a part 26 which contacts with an inner 15 at the electrode setting time are formed in the material 14. The possibility of deformation of the electrode 11 becomes highest at the time of inserting the electrode part into the mandrel 12 in a beading process. But the inner 15 is brought into contact with the mandrel 12 and is supported with the part 26 which contacts with the material 14 and thus the local deformation of the inner is suppressed at the time of insertion of the electrode 11 into the mandrel 12 by using this jig. In this way, a high quality color cathode-ray tube is obtained.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a beading process in which each electrode of an electron gun is supported on an insulating support to determine the relative position between the electrodes.
The present invention relates to a color cathode ray tube using an electron gun with good characteristics assembled with a jig that prevents deformation in delicately shaped parts such as the electron lens component of the electrode.

[Prior Art] The color cathode ray tubes currently in use are in-line tubes in which three electron guns for each primary color are arranged in one plane, making it easy to concentrate and adjust the electron beam during use and relatively easy to assemble. It uses a type electron gun. However, satisfying the demand for high image quality is not easy even when using an in-line electron gun. 1. In the assembly process of an in-line electron gun, the supporting parts of each electrode of the electron gun are heated and softened. The beading process is important for relative positioning of the electrodes by press-fitting them into a glass insulating support. There was no particular problem by inserting the mandrel of a beading jig into the hole and positioning each electrode relative to each other, but with the strong demand for high image quality, each electrode was attached to a beading jig. Deformation of the electrodes that sometimes occurs has become a problem.

Note that this type of technology includes, for example, Japanese Patent Application Laid-Open No. 1-18774.
It is disclosed in Publication No. 3.

[Problem to be solved by the invention] The relative position of each electrode is determined in the beading process, and specifically, it is necessary to accurately determine the relative position of the location where the electron beam passage hole forming the electron lens of each electrode is formed. It is. In order to improve the focusing characteristics of electron guns, lenses with larger diameters have gradually been used, but if this method were to be fully developed, the electrode thickness around the electron beam passage hole would have to be reduced. , the mechanical strength of this part is reduced, and even a slight contact with another object causes it to deform. In the past, the wall thickness around the electron beam passage hole had not become very thin and was strong, so simply fitting the mandrel of the beading jig directly into the hole did not cause any deformation that would cause problems.

On the other hand, if high accuracy is required in the relative position of each electrode component, the clearance existing between the jig and the electrode has to be narrowed. The narrower the clearance, the more difficult it becomes to attach the electrode component to the jig, and when the jig is attached, the electrode comes into strong contact with the jig, making it easy to cause local deformation of the electrode.

The present invention solves the above conventional problems and provides a high-performance electron gun in which delicately shaped electrode parts are assembled with high relative positional accuracy without deformation using a jig with an appropriate structure in the beading process. The purpose of the present invention is to provide a color cathode ray tube using the following methods.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, the support portion of each electrode of the electron gun of a color cathode ray tube equipped with three electron guns arranged in one plane is heated. In the beading process, the relative positioning of electrodes is determined by press-fitting them into a softened glass insulating support.When fitting each electrode to the mandrel of the beading jig, the The deformation of the electrode due to contact with the mandrel is suppressed by the member of the beading jig having a structural shape suitable for the above-mentioned mandrel.

Specifically, the members of the beading jig have a structural shape that suppresses deformation of the electrode at the part that comes into contact with the mandrel, or a structure that makes it difficult for the mandrel and the easily deformed part of the electrode to come into contact with each other. Alternatively, the structure has a shape that prevents contact.

In addition, in the beading process, in addition to the jig according to the present invention described above, with each electrode mounted on this jig and accurate relative positions established, a multiform glass that insulates and supports the electrodes is used. A so-called beading machine is also used to heat the rod to soften it, and then quickly press fit the support portion of each electrode into the glass rod to fix it in the appropriately softened state.

[Function] It is clear that by using the beading jig members as described above, deformation of each part of the electron gun electrode is suppressed, the focusing performance of the electron gun is improved, and a color cathode ray tube with high image quality can be obtained. be.

[Example] Fig. 1(,) is a top view showing a state in which an electrode is attached to a beading jig according to an embodiment of the present invention, Fig. 1(b) is a partially sectional front view of the same state, and Fig. 1(b) is a partially sectional front view of the same state. Figure (c) is a partially cross-sectional side view of the same state. In these figures, 11 is one electrode of an electron gun of a color cathode ray tube, 12 is a mandrel of a beading jig, 13 is a fixing base of the mandrel, 14 is an example of a member of a beading jig according to the present invention, 15 is commonly called an inner lens which corrects aberrations of the electron lens inside the electrode 11 when the electron gun operates.

FIG. 2(a) is a top view showing details of the electrode 11 having the delicate inner part 15 where the effect of using the jig according to the present invention is particularly large, and FIG. 2(b) is a front view showing a partial cross section. Figure 2(c) is a side view partially cut away, and Figure 2(c) is a partially sectional side view.
d) is a bottom view thereof. Components that are the same as those in Figure 1 are given the same reference numerals.

As shown in the second figure, an example of the actual shape of the inner 15 is such that the electrode 11 is formed of a thin metal plate, and an electron beam passage hole 16 for a central electron gun is provided in the center. Further, in this embodiment, the electron beam passage hole 17 of the side electron gun is formed on both sides of the passage hole 16, but the inner 15 forms only the half circumference on the side closer to the passage hole 16. . Each passage hole has a long diameter in the direction perpendicular to the plane on which the three electron guns are arranged, and a short diameter on the plane. Hole 1
No. 7 has a semi-elliptical shape with a small protrusion of the entrance on the side near the center, and a substantially semicircular shape with a large protrusion of the opening on the side near the end. In such a shape, Fig. 2 (a), (d)
The part marked A in the figure is likely to deform due to stress in a direction perpendicular to the plane of the drawing. The distance Z between the surface B of the inner 15 and the surface C of the electrode 11 shown in the front view of FIG. 2(b) is important in determining the electric field during electron gun operation.

For example, FIG. 3 shows electrode 11 and another electrode 18 of similar structure.
When facing each other and connecting the high voltage power supply 19, an equipotential surface as shown at 21 is formed by the side surface of the electrode 11, the side surface E of the electrode 18, and the inner surface 15. 16. It has a lens effect on the electron beam passing from 23 to 17. Since the strength of the electron lens is determined by the electric field and the aberration by the shape of the equipotential surface, the distance between the inners 15 and 20 and the shapes of the inners 15 and 20 are designed in accordance with the usage conditions of the electron gun. Therefore, for example, if the inner 15 is deformed and 2 shown in Fig. 2(b) changes, the electric field strength and the shape of the equipotential surface change, and the characteristics of the electron lens change. ,
The focus characteristics of a color cathode ray tube change from the set value, so it is necessary to have high machining accuracy when manufacturing electrode parts. Furthermore, once the electrode component is completed, it must be sealed within a color cathode ray tube to maintain the manufacturing precision until it is mounted in a final use device, such as a television receiver. However, since it is structurally difficult to obtain sufficient mechanical strength near A of the inner 15 of the electrode 11, there is a possibility that the area may be deformed during handling during manufacturing of the electron gun. From conventional experience, the probability of deformation is highest when inserting the electrode component into the mandrel during the beading process.The present invention prevents deformation of the inner 15, etc. when inserting the electrode component into the mandrel during the beading process. The purpose is to make the electron gun exhibit the desired characteristics.

The fourth drawing shows an example of the jig member 14 for inserting the mandrel 12 into the electrode 11 used in the present invention.The jig has a guide hole for passing the mandrel 12 shown in the first drawing. 24, a groove 25 for holding and positioning the electrode 11, and a portion 26 that comes into contact with the inner 15 when the electrode 11 is set in the jig. With this structure, even if the inner 15 comes into contact with the mandrel 12 when the electrode 11 is inserted into the mandrel 12, as shown in the first figure, the inner 1
5 is lined with the contact portion 26 of the jig member 14, thereby suppressing local deformation of the portion A of the inner 15.

The jig member 14 is as shown in FIGS. 1(b) and 1(c).
In addition to the structure in which the electrode 11 is held between the electrodes 11 and positioned on the opposite side of the mandrel fixing base 13, the structure can be changed from the example shown in Figure 4 to be placed between the electrode 11 and the mandrel fixing base. 5(a), (b), and (c) show an embodiment in this manner.

27 is an electrode insertion jig, and 28 is a guide portion of the jig 27 which is used while being positioned between the electrode 11 and the mandrel fixing base 13. FIGS. 6(a) and 6(b) show the shape and structure of the jig 27 alone. As shown in FIGS. 5(b) and 5(C), the electrode 11 is fitted into the guide portion 28 of the jig 27 in advance,
In this state, the electrode 1 with the mandrel 12 mounted on the jig 27
Insert into 1. In the state shown in FIGS. 5(b) and 5(c),
Since the lower part of the jig 27 covers the part A of the inner 15 from below, the mandrel 12 and the inner 15 cannot come into contact with each other, so that the inner 15 does not deform.

The embodiments of the present invention have been described above, but the basic structure of the jig is, in short, to the mandrel of the beading jig.
Particularly delicate parts of the electrode that are easily deformed, such as the inner part, should not be deformed even if they come into contact with each other, or the inner part and the mandrel should not be in contact with each other, as shown in Figures 4 and 6. We do not care about the shape of the jig.

[Effects of the Invention] As explained above, according to the present invention, when the relative position between each electrode of the electron gun of a color cathode ray tube is determined in the beading process, even the part of the electrode that is most easily deformed is not deformed. Since this is prevented, a color cathode ray tube with good characteristics such as focus can be obtained.

[Brief explanation of drawings]

FIG. 1(&) is a top view showing a state in which an electrode according to an embodiment of the present invention is attached to a beading jig, FIG. 1(b) is a front sectional view in the same state, and FIG. 1(c) is a top view in the same state. Side sectional view, Figure 2 (a
) is a top view of an example of an electrode with delicate parts where the use of the jig according to the present invention is particularly effective, FIG. 2(b) is a partially sectional front view of the electrode, and FIG. 2(C) is its Partially sectioned side view, Figure 2(d) is a bottom view, Figure 3 is a diagram showing an example of an equipotential surface that occurs when high voltage is applied by combining electrodes, and Figure 4(a) is a top view of a jig used in an embodiment of the present invention, FIG. 4(b) is a partially cross-sectional front view of the same jig, and FIG. 4(c) is a partially cross-sectional view of the same jig. Side view,
FIG. 4(d) is a bottom view of the same jig, FIG. 5(a) is a top view showing a state in which the electrode beading jig is attached according to another embodiment of the present invention, and FIG. 5(b) is the same. 5(c) is a partially sectional side view of the same state; FIG. 6(a) is a top view of a jig used in another embodiment of the present invention; FIG. 6(b) is a partially sectional side view of the same jig. 11... Electrode, 12... Mandrel, 14...
- Members of the jig according to the present invention, 15... Inner. Figure (bl (C) Figure (b) (C) 6 + t -as 15-I〉19 21-Electrical machine surface diagram (b) (C) 4 (dl Figure [01 2 (bl (C) Figure (0) 27-56゜゜゜゜゛゛゛゛Y'person b

Claims (1)

[Scope of Claims] 1. The support portion of each electrode of the electron gun of a color cathode ray tube equipped with three electron guns arranged in one plane is press-fitted into an insulating support made of glass that has been softened by heating. In the beading process for relative positioning of the electrodes, when each electrode is fitted onto the mandrel of the beading jig, at least one electrode is fitted with a member of the beading jig having a structural shape suitable for that electrode. . A color cathode ray tube, characterized in that deformation of the electrodes due to contact with the mandrel is suppressed. 2. The color cathode ray tube according to claim 1, wherein the member of the beading jig has a structural shape that makes it difficult or impossible for the mandrel and the deformable portion of the electrode to come into contact with each other.