JPH04101351U - Electron gun structure for cathode ray tube - Google Patents

Abstract

(57) [Summary] [Structure] The welded portion of the funnel getter structure 8 with the shielding electrode forms a curved surface portion 9 having approximately the same curvature as the curvature of the cylindrical shape of the shielding magnetic pole. [Effect] Welding conditions are stabilized, spatter scattering during welding can be prevented, and a high-quality and highly reliable electron gun structure can be provided.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an electron gun structure for a cathode ray tube, and in particular to a cathode ray tube having a funnel getter structure. This invention relates to an electron gun structure for polar ray tubes.

0002

[Conventional technology]

Generally, an electron gun assembly for a cathode ray tube (hereinafter referred to as an electron gun assembly) is as shown in Fig. 3. , a heater (not shown), a cathode (not shown), and a melt on the multifoam glass 1. The attached focusing electrode 2, anode electrode 3, shielding magnetic pole 4, a plurality of spacers 5, and funnel gear It is configured to include a data structure 6. The anode electrode 3 is welded to the shielding magnetic pole 4, and the shielding As shown in FIG. 4, the magnetic pole 4 has a plurality of spacers 5 and a funnel getter structure 6 melted therein. Fixed. The funnel getter structure 6 vacuum-seals the electron gun structure to the cathode ray tube. A getter whose main component is barium to adsorb the gas generated inside the tube when is used, but it works to fix this.

0003 On the other hand, in the electron gun assembly for color picture tubes, each welding assembly of the electron gun assembly is In order to improve the reliability of color picture tubes, we guarantee welding strength and In order to prevent defects such as foreign objects in the pipe and shorts between electrodes, prevent spatter from flying during welding. You have to be especially careful when it comes to scattering.

0004 However, as shown in FIGS. 4 and 5, the conventional shielding magnetic pole 4 and funnel getter structure 6, the shielding magnetic pole 4 is cylindrical, while the funnel getter structure 6 has a plate-like flat part 7, and the welding conditions when welding and fixing these two parts are stable. First, the reliability of the electron gun assembly deteriorated due to the occurrence of spatter.

[0005]

[Problem that the idea aims to solve]

The conventional electron gun structure described above has a funnel getter structure in the shielding magnetic pole 4, as shown in FIG. The body 6 is fixed by welding. Welding of this shielding magnetic pole 4 and funnel getter structure 6 In the fixed part, the shielding magnetic pole 4 has a cylindrical shape, and the funnel getter structure 6 has a flat plate shape. It has a surface part 7, and when welding and fixing these two parts, the welding conditions are unstable and spatter occurs. As a result of this, a protrusion is formed on the electrode surface, and the protrusion peels off, causing foreign matter inside the tube. This causes it to adhere between the electrodes, causing poor breakdown voltage between the electrodes. Furthermore, poor welding strength If this occurs, the welding quality will deteriorate and the reliability of the electron gun structure will be significantly reduced. There was a problem.

[0006] An object of the present invention is to provide a highly reliable electron gun assembly.

[0007]

[Means to solve the problem]

In this invention, multiple electrodes are arranged on an insulating support with a predetermined interval between each electrode. and is welded and fixed to the cylindrical shielding magnetic pole to which high voltage is applied among the plurality of electrodes. In the electron gun assembly for a cathode ray tube having a funnel getter assembly, the fan The welded portion of the Nelgetter structure with the shielding magnetic pole is the same as the curvature of the cylindrical shape of the shielding magnetic pole. A curved surface portion having one curvature is formed.

[0008]

【Example】

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

[0009] FIG. 1 is a perspective view of a funnel getter structure according to an embodiment of the present invention.

0010 As shown in FIG. 1, the welded portion of the funnel getter structure 8 with the shielding magnetic pole is the shielding magnetic pole. A curved surface portion 9 is formed having approximately the same curvature as that of the cylindrical shape.

[0011] Figures 2 (a) and (b) show the funnel getter structure shown in Figure 1 fixed to the shielding magnetic pole by welding. They are a top view showing a state and a partially enlarged plan view of part A.

0012 As shown in FIGS. 2(a) and 2(b), the curved surface portion 9 of the funnel getter structure 8 provides shielding. It has almost the same curvature as the cylindrical shape of the magnetic pole 4, and the funnel getter structure 8 and the shielding magnetic pole 4 The shielding magnetic pole 4 has a cylindrical shape, while the funnel getter structure 8 The curved surface portion 9 has a curved surface with almost the same curvature as the shielding magnetic pole 4, so these two A reliable electron gun that maintains good welding conditions when welding and fixing, and has high welding quality. It becomes possible to provide a structure.

[0013]

[Effect of the idea]

As explained above, the present invention is applicable to the welded part of the funnel getter structure with the shielding magnetic pole. By providing a curved surface with almost the same curvature as the cylindrical curvature of the shielding magnetic pole, welding strips can be The condition is stable and it is possible to prevent spatter from scattering during welding, resulting in high quality and reliable This has the effect of providing an electron gun structure with high quality.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a funnel getter structure according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state in which the funnel getter structure of FIG. 1 is welded and fixed to a shielding magnetic pole.

FIG. 3 is a side view of an example of a conventional electron gun assembly.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a perspective view of the funnel getter structure of FIG. 3;

[Explanation of symbols]

1 Multiform glass 2 Focusing electrode 3 Anode electrode 4 Shield magnetic pole 5 Spacer 6,8 Funnel getter structure 7 Plane part 9 Curved surface part

Claims (1)

[Scope of utility model registration request] 1. A funnel getter in which a plurality of electrodes are arranged on an insulating support at predetermined intervals and fixed by welding to a cylindrical shielding magnetic pole to which a high voltage is applied among the plurality of electrodes. In the electron gun assembly for a cathode ray tube, the welded portion of the funnel getter assembly with the shielding magnetic pole forms a curved part having the same curvature as the cylindrical curvature of the shielding magnetic pole. Electron gun structure for cathode ray tube.