JPH02152145A - Electrode structure of electron gun for color picture tube - Google Patents

Abstract

PURPOSE:To reduce the thermal deformation owing to the welding and to realize a low cost of the production by forming an electrode using a thick plate. CONSTITUTION:This electrode structure is formed by connecting two parts, a thick plate electrode 6 and a cup-form electrode 1 by a welding 7. A thick plate with the thickness about 3.5mm is processed by a pressing or the like to form the thick plate electrode 6 furnishing a sinking groove 6d, electron beam passage holes 6a, 6b, and 6c, and bridges 6e and 6f. Since the cup electrode 1 is welded to the electrode 6 formed of a thick plate material by the weld 7, the thermal deformation of the electrode structure is little, increasing the formation accuracy. And since the number of parts is few, the cost is also reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrode structure for an electron gun for a color picture tube, and more particularly to an in-line type main lens system electrode structure.

[Conventional technology]

Conventionally, in order to improve the assembly accuracy of the electrodes, the main lens electrode was constructed with a plurality of 11L poles 1.2.3 as shown in FIG.
It is known that an electrode structure is constructed by combining the following. That is, the opening side of the cup-shaped electrode 3 is overlapped with the bottom surface of the cup-shaped electrode 1 via the plate-shaped electrode 28, and the welded portions are joined by welding 4.5. Here, the cup-shaped electrodes 1 and 3i1 are made of a non-magnetic metal plate such as a stainless steel plate with a thickness of about 0.311I+I+, and one large electron beam passage hole 1a%3a is formed. The plate electrode 2 is made of a non-magnetic metal plate such as a stainless steel plate having a thickness of about 0°6Mn, and has three electron beam passage holes 2a12b12C formed in-line.

Note that a structure in which a plurality of electrodes are combined is disclosed in, for example, Japanese Patent Laid-Open No. 59-54152.

[Problem to be solved by the invention]

Since the above-mentioned prior art has a thin plate-shaped electrode 2, there is a problem in that when the welded portion is welded 4.5, the plate-shaped electrode 2 is distorted by the welding heat, resulting in a decrease in flatness.

An object of the invention is to provide an electrode structure for an electron gun for a color picture tube in which deformation of ti due to welding is prevented.

[Means to solve the problem]

The above purpose is to form a thick plate material with three in-line electron beam passages and through holes, and one side of which is formed with a sunken groove of a size that includes the three electron beam passage holes. This is accomplished by comprising an electrode and a cup-shaped plate whose bottom surface is disposed on the opposite side of the sinking groove of the thick plate electrode and is welded to the plate.

[Effect]

Conventionally, the structure was made up of two cup-shaped electrodes and a thin plate-shaped electrode +IjL1, whereas the conventional one was made up of one cup-shaped electrode and a thick plate electrode. The shaped! electrode and the plate-shaped 1a electrode are integrally formed from a thick plate material to form a thick plate electrode.

In this way, since one cup-shaped electrode is welded to the thick plate electrode, the thick plate electrode is not deformed by welding heat.

Also, the parts are a few steps shorter and there are fewer welding points, so
Cost reduction can be achieved.

[Example] An example of the present invention will be described below with reference to Fig. 1. The thick plate electrode 6 made of a thick plate material has three electron beam passing holes 6a and 6bs6c arranged in-line.
Also, one side of the front electron beam passing holes 6a, 6b.
, 6c, a sunken groove 6d embossed with a size including 6c.
is formed.

When the depressed groove 6d is formed by stamping in this manner, the bridge portions 6e and 6f of the electron beam passage holes 6a, 6b, and 6c are formed to protrude from the other surface.

Here, the thickness t of the thick plate electrode 6 is equal to the total thickness of the plate electrode 2 and the cup-shaped electrode 3 in FIG. It is formed to have the same thickness as the cup-shaped electrode 3.

On the surface of the thus formed thick plate electrode 6 opposite to the sunken groove 6d, the bottom surface of the cup-shaped electrode 1, which is the same as the conventional one, is disposed, and the welded portion is joined by a weld 7.

In this way, since the cup-shaped electrode 1 is welded 7 to the thick plate electrode 6 made of a thick plate material, the thick plate electrode 6 is not deformed by welding heat, and electrode accuracy is improved. In addition, there is one less part than before, and there is less welding work, so
Cost reduction can be achieved.

FIG. 2 shows another embodiment of the invention. In the embodiment described above, the sunken groove 6d was formed by embossing.

Non-embodiments are formed by milling or the like. Even if formed in this way, the same effects as in the embodiment described above can be obtained. However, since the thick plate electrode 6 has a thickness of about 3.5 mm, milling is not practical, and embossing as in the previous embodiment is preferable.

〔Effect of the invention〕

According to the present invention, since the two electrodes are formed by integral molding, deformation of the electrodes due to welding is prevented, electrode precision is improved, and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the invention, lal is a sectional view, t
b+ is a central sectional view of la), FC+ is a bottom view, FIG. 2 shows another embodiment of the present invention, (a) is a sectional view, (bl is a central sectional view of la), and FIG. 3 is a conventional example , lal is a cross-sectional view, and (b) is a central cross-sectional view of ial. 1...Cup-shaped electrode% 6...Thick plate electrode, 6a
, 6b, 6c...Electron beam passage hole, 6d...Sinking groove, 7...Welding.

Claims (1)

[Claims] 1. A thick plate electrode in which three in-line electron beam passing holes are formed in a thick plate material, and a sunken groove of a size that includes the three electron beam passing holes is formed on one surface; 1. An electrode structure for an electron gun for a color picture tube, comprising a cup-shaped electrode whose bottom surface is disposed on the opposite side of the sinking groove of the thick plate electrode and is welded and fixed thereto.