KR910003947Y1 - Electrode of electron gun - Google Patents

Abstract

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Description

Electrode of electron gun

1 is a longitudinal sectional view showing an example of an electron gun used.

FIG. 2A is a front view showing the electrode structure of the electron gun according to the prior art, and FIG. 2B is a side cross-sectional view along the line AA ′ of FIG. 2A.

Figure 3a is a front view showing the electrode structure of the electron gun according to an embodiment of the present invention, 3b is a side cross-sectional view taken along the line B-B 'of Figure 3a.

4 is a front view showing the electrode structure of the electron gun according to another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

K: cathode G1: first electrode

G2: second electrode G3: third electrode

G4: 4th electrode BG: Bead glass

20A: electrode buried portion 21: non-passing hole

23: heat deformation preventing pressing portion 25: mechanical deformation preventing pressing portion

27: curved portion 29: through hole

The present invention relates to an electrode of an electron gun, and more particularly, to an electrode structure of an electron gun, which increases the embedding strength of the bead glass and prevents physical deformation of the electrode during fusion with the bead glass and thermal deformation during normal operation. It is about.

In general, an electron gun of a cathode ray tube such as a cathode ray tube for a television receiver has a cathode K, a first electrode (control electrode) G1, a second electrode (screen electrode) G2, It is composed of a third electrode (focus electrode) (which may be composed of one or two or more) G3 and a fourth electrode (anode electrode) G4 and accelerates electrons emitted from the cathode K on the screen surface. The fluorescent substance of is made to fluoresce.

These electrodes G1 to G4 are supported at regular intervals by being embedded in bead glass BG, whose buried portions are two or more non-conductors.

Bead glass BG is provided in parallel with the advancing direction of an electron beam.

In the field of manufacturing technology of the CRT, in order to obtain long-term life and good characteristics of the electron gun, the embedding strength of the electrode to the bead glass is strengthened, and mechanical deformation is prevented during heat fusion to the bead glass, In order to ensure the flatness of the electrode, efforts have been made to suppress thermal expansion of the electrode during normal operation of the electron gun.

Figure 2 shows the structure of the electrode of a conventional electron gun as part of this effort.

The electrode 10 of FIG. 2 shows the shape of a plate electrode used for a part G34 of the first electrode G1 or the third electrode G3, and three R, G, and B electron beams are located at the center of the electrode. Three holes 11 that can pass through are formed in a row.

An annular pressing portion 13 having a curvature is formed around these non-passing through holes 11, which serves to suppress deformation of the body of the electrode by heat generated when the electron gun operates normally.

Filling portions 10A and 10A embedded in bead glass are formed at upper and lower ends of the electrodes, respectively, and holes are formed in both ears of the filling portions 10A and 10A, respectively. ) 17 are formed to allow a portion of the bead glass to be inserted into the through-holes when the bead glass is fused.

As such, when a part of the bead glass is embedded in the through hole and cured, the embedding strength of the electrode is enhanced to significantly reduce the phenomenon that the electrode is separated from the bead glass. In addition, between the buried portions 10A and 10A of the electrode and the annular pressing portions 13 and 13 and 13, the linear pressing portions 15 and 15 are arranged in parallel with the alignment line of the non-ventilating holes 11. It has a curvature as shown in Fig. 2b.

The curved pressing portions 15 and 15 serve to suppress deformation of the electrode due to mechanical impact when the bead glass BG (BG) is fused to the electrode.

By the way, in the above-described conventional electrode structure, the embedding strength is strengthened by incorporating the material of the bead glass (BG) (BG) into the through-holes 17, 17 of the buried portion (10A) (10A), but not As the outer surface of the bead glass (BG) (BG) of the buried point is immersed by the amount of the embedded glass, the buried glass of the bead glass is cracked in the process of handling the electron gun structure, and thus the bearing capacity of the electrode is weakened. have.

In addition, since the linear pressing portions 15 and 15 having the grains formed to suppress the deformation of the electrodes are small in flatness, when drawing out a jig (not shown) used to hold each electrode at a predetermined interval, Occasionally, the jig distorted the fixed electrode, making it difficult to obtain the electrode structure held at the correct intervals.

Accordingly, the present invention has been made to solve the above-described drawbacks, and an object of the present invention is to provide an electrode of an electron gun capable of curing the embedding strength of the electrode without causing cracking of the bead glass.

Another object of the present invention is to increase the flatness of the pressing part to suppress the deformation of the electrode when the bead glass is fused to prevent distortion of the fixed electrode by drawing out the assembly jig to obtain an electrode assembly of the electron gun which accurately obtains the electrode structure. To provide.

The electrode of the electron gun for achieving the first object of the present invention is characterized in that one or more curved portions protruding in the same or opposite direction to the traveling direction of the electron beam to the buried portion of the electrode.

The electrode of the electron gun of the present invention for achieving the second object of the present invention is to give the pressing portion for suppressing the deformation of the electrode when the bead glass is fused to give a plan view that forms a direction perpendicular to the electron beam direction, the overall flatness of the electrode Characterized in that it is configured to raise the degree.

The pressing portion having a plane perpendicular to the electron beam direction has a cross-sectional structure of “c” shape as a whole, thereby more effectively cushioning the impact during fusion of the bead glass, compared with the conventional (grain-like) pressing portion. This gives an additional advantage of making the strain almost zero.

Hereinafter, the present invention will be described in more detail with reference to FIGS. 3 and 4 in which an embodiment of the present invention is shown.

Although the electrode 20 shown in FIG. 3 also shows a plate-like electrode structure, the present invention can of course be applied to a cylindrical electrode. In the center of the electrode 20, R, G, and B electron non-passing holes 21 and an annular pressing portion 23 for preventing heat deformation are formed as shown in FIG. One or more curved portions 27 are formed at predetermined positions of the buried portions 20A, which are integrally formed at the upper and lower ends of the electrode 20. In this embodiment, two curved portions of the upper and lower buried portions 20A, respectively, are formed. Formed. The protruding direction of the curved portion 27 is set in the same or opposite direction to the electron beam propagation direction, and the protruding direction may be determined in consideration of the electrical influence with the adjacent electrodes. Since the curved portion 27 does not cause immersion of the outer surface of the bead glass at the buried position when it is buried in the bead glass BG, it can not only prevent cracks of the bead glass but also bead glass by the shape of the curved surface. Since the contact area with is increased, the embedding strength is much increased compared with the conventional.

On the other hand, the pressing portion 25 formed to suppress the deformation of the electrode at the time of bead glass welding includes a vertical plane with respect to the progress of the electron beam by adopting a cross-sectional structure of the letter "c" as shown in Figure 3b .

As a result of the addition of the flat portion, the overall flatness of the electrode 20 is increased, so that the assembly degree of the electrode is much more accurate, and the electrode structure with which the resistance to deformation due to fusion is much improved can be obtained. In addition, it is possible to more effectively prevent thermal deformation during normal operation.

Referring to the electrode shown in FIG. 4 as another embodiment of the present invention, between the curved portion 27 formed in the buried portion 20A of the electrode 20, a through hole 29 having a diameter smaller than the diameter of the curved portion is You can see it installed. Since the diameter of the through hole 29 has a small dimension, the amount of material of the bead glass that is incorporated into the through hole is not large, so that cracks due to immersion of the outer surface of the bead glass do not occur, whereas the buried strength of the curved portion is further increased. The effect of reinforcement can be obtained.

Claims (2)

It characterized in that formed by projecting one or more curved portion 27 in the same or opposite direction to the traveling direction of the electron beam at a predetermined position of the upper and lower buried portion (20A) of the electrode embedded in the bead glass (BG) of the electron gun Electrode of electron gun. The method according to claim 1, wherein in order to suppress the deformation of the electrode during the bead glass welding, the pressing portion 25 formed in parallel with the alignment line of the passage holes 21 of the R, G, and B electron beams is disposed in the electron beam traveling direction. Electrode of the electron gun characterized in that to give a flat portion perpendicular to the direction to increase the overall flatness of the electrode.