KR920005829Y1 - Electron gun of color crt - Google Patents

Abstract

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Description

Electron gun for colored cathode ray tube

1 is an excerpted sectional view of an anterior tripolar portion which is an electron beam generator in a conventional electron gun for color cathode ray tubes.

Figure 2 is an excerpted cross-sectional view of the anterior tripolar portion, which is a pendulum beam generator in one embodiment according to the electron gun for color cathode ray tube of the present invention.

3 is an exploded perspective view of a control electrode and a shield plate attached thereto in the electron gun of the present invention shown in FIG.

* Explanation of symbols for main parts of the drawings

K: cathode structure E: cathode material

BM: Base Metal S: Sleeve

H: Heater G1: Control Grid

G2: Screen Grid I: Insulating Insulating Wall

The present invention relates to an electron gun for a color cathode ray tube, and more particularly to an electron gun for a color cathode ray tube with an improved structure of an anterior triode which is an electron beam generating source.

A typical electron gun for color cathode ray tubes has an anterior tripolar portion of the type shown in FIG. The prepolar triode has a cathode structure (K) composed of a base metal (BM) coated with a cathode material (E), a sleeve (S) for holding and fixing the heater (H), and a cathode It consists of three elements, such as control grid G1 and screen grid G2, which form the hot electrons emitted from the cathode material E of the structure K into electron beams, which are formed by both bead glass BG. Supported.

The problem with the conventional electron gun of this structure is that the negative electrode material evaporated from the base metal (BM) is the portion between the bead glass (BG), especially the control grid (G1) and the cathode structure (K) on both sides thereof. The breakdown phenomenon between the cathode structure K and the control grid G1 may occur due to adhesion to the cathode structure. In this case, a leakage current flows between the cathode structure K and the control grid G1. Further, the disconnection of the heater H is caused by the breakdown of the insulation between the sleeve S and the heater H, that is, the breakdown of the coating material of the heater V.

Therefore, in order to solve the above problems, a countermeasure should be provided to prevent the negative electrode material evaporated from the base metal from moving to the bead glass and attached. The present invention solves this problem. The purpose is to provide.

In order to achieve the above object, the present invention provides three base metals to which a negative electrode material is applied to an anterior triode, a sleeve for supporting and fixing each of them, and a built-in heater, and a predetermined distance in front of the base metal. In an electron gun for a color cathode ray tube having a control grid and a screen grid arranged sequentially, an insulating insulating wall enclosing the three base metals to a certain height is provided on one side of the control grid facing the base metal. There is a characteristic.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 shows an extract of the anterior tripolar portion which is the electron beam generating source in the electron gun of the present invention. This prepolar triode is a cathode structure (K) having a base metal (BM) to which the negative electrode material (E) is applied, a sleeve (S) for fixing and supporting a heater (H) as in the prior art. It is equipped with three elements such as control grid (G1) and screen grid (G2) to form the hot electrons emitted from the electron beam. In addition, two insulating insulating walls I are provided on one side of the control grid G1 facing the base metal BM to surround the base metal BM at a predetermined height, as shown in FIG. 3. As shown in the drawing, extension portions 1a are formed at both edges of the upper end of the body, and right-angled fitting portions 1b are formed at the end thereof, and the control grid G1 has the separating wall I and the body and the upper portion thereof. Through-holes A1 and A2 into which both shaft fitting portions 1b are fitted are formed, respectively. After the insulating wall I and the control grid G1 of this type are fitted with each other, they are brought into contact with the pleated glass F.

As a result, the three base metals of this structure are separated from the bead glass on both sides by the insulating insulating wall attached to the control grid. Therefore, the negative electrode material evaporated from the base metal cannot reach the bead glass on both sides. Therefore, short phenomenon due to adhesion of the negative electrode material to the portion between the bead glass, in particular the cathode structure and the control grid, is prevented.

According to the present invention, the adhesion of the negative electrode material to the bead glass is prevented, which improves the conventional problem. Furthermore, the insulating insulating wall and the adhesive thereof act as a kind of reinforcing bead on the control grid, so that the distortion of the control electrode due to external force can be suppressed. The performance deterioration factor in the anterior triode is greatly removed. Thus, the performance of the cathode ray tube is guaranteed to a certain level.

Claims (1)

Three cathode structures (K) arranged inline, and a transposition tripolar portion having a control grid (G1) and a screen grid (G2), each of which has a surface facing the control electrode. In the electron gun for a color cathode ray tube is provided with a base metal (BM) to which a cathode material is applied to and a sleeve (S) for supporting and fixing it at the bottom and having a heater (H) therein, the control grid ( Through-holes A1 and A2 at predetermined intervals are formed on both sides of the longitudinal direction of G1, and two judges are arranged in the through-holes A1 and A2 in the arrangement direction of the cathode structure K. The fitting portions 1b provided at both ends of the insulating wall I and I are fixed to the pleat glass F while being fitted in the corresponding through holes A1 and A2, so that the two separating walls I are opposed to each other. (I) is intended to commonly enclose the three cathode structures K therebetween Electron gun for color cathode ray tube to be made.