JPS6313241A - Inline type electron gun electrode structure for color picture tube - Google Patents

Abstract

PURPOSE:To increase the strength in axial direction and maintain parallelism by providing multiple plates in two tubular electrodes and welding and fixing the two tubular electrodes to the plates. CONSTITUTION:Before assembling a lower focusing electrode 2 and an upper focusing electrode 3 into an assembly jig, flat plates 4 are welded to the lower focusing electrode 2 at multiple welding points 5 by resistance welding in advance. Holes 2a and 3a of the lower focusing electrode 2 and the upper focusing electrode 3 are fitted around a metal core 11 and an upper base 13 is pressed against a spacer 16. By this constitution, the bottom of the lower focusing electrode 2 is pressed against the upper base 13 by the energizing power of a spring 12, and the top of the upper focusing electrode 3 is forced into close contact with the top face of the lower base 10 by multiple pins 14 which receive the energizing power of springs 15. Accuracy of parallelism between the bottom of the electrode 2 and the top face of the electrode 3 is maintained. Then laser beam is radiated from a specified direction to weld the upper electrode 3 to the plates 4 at multiple points 6 on the side surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an in-line type electron gun electrode assembly for color storage.

[Conventional technology]

In an in-line electron gun, in order to prevent fluctuations in focus characteristics due to coma aberration, it is necessary to make the electron beam enter the center of each main lens.

Therefore, in order to allow the electron beam emitted from each cathode to travel straight, it is necessary to make the electron beam passage holes of the control electrode, accelerating electrode, and lower focusing electrode coaxial and parallel to each other.

For this purpose, it is necessary to accurately assemble the parallelism of the upper and lower surfaces of the lower focusing electrode and the upper focusing electrode forming the focusing electrode and the coaxial degree of the electron beam passage hole. The lower focusing electrode and the upper focusing electrode are each manufactured by press-drawing stainless steel plates with a thickness of about 0.31 mm, but since there is a slight error in the parallelism of the upper and lower surfaces, they are simply stacked one on top of the other. This does not satisfy parallelism accuracy.

Conventionally, as a method for improving the precision of assembled parts without being affected by the parallelism of each part, for example, Japanese Patent Laid-Open No. 6
No. 0-163335 l As shown, the upper and lower end surfaces of the lower focusing electrode and the upper focusing electrode forming the focusing electrode are elastically pressed against a parallel substrate, and their respective flange surfaces are joined by laser welding.

[Problem that the invention seeks to solve]

Focusing 1 assembled using the above conventional technology! The parallelism of the upper and lower end surfaces of the pole immediately after assembly is very good. However, when removed from the assembly jig and transported, it is deformed by pressure from the vertical (axial) direction, resulting in a problem of loss of parallelism.

An object of the present invention is to provide an in-line electron gun electrode assembly for a color picture tube that has strong axial strength and maintains parallelism.

[Means for solving problems]

The above object is achieved by inserting a plurality of plate bodies into the inner pot of the two cylindrical electrodes and fixing the two cylindrical electrodes and the plate bodies by welding.

[Effect]

Since the two cylindrical electrodes are reinforced with a plate-like body, their strength is strong and parallelism is maintained after assembly.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The focusing electrode 1 is made up of a lower focusing electrode 2 and an upper focusing electrode 3 as in the conventional case, each of which is provided with three electron beam passage holes 2a and 3a. Note that the upper focusing electrode 3
Only the central electron beam passage hole 3a is shown. The inner diameter of the cup of the upper focusing electrode 3 is slightly larger than the inner diameter of the cup of the lower focusing electrode 2. A flat plate 4 is disposed on each of the long sides of the lower and upper focusing electrodes 2.3 having such a structure, and the lower focusing electrode 2 and the flat plate 4 are welded at a plurality of welding points 5 by resistance welding or the like. The upper focusing electrode 3 and the flat plate 4 are joined by laser welding at a plurality of welding points 6.

Next, FIG. 3 shows the assembly of the focusing electrode 1 having the above configuration.
Let me explain. The assembly jig shown in this embodiment has almost the same structure as the conventional one. At least two core metals 11, which are inserted into the electron beam passage holes 2a and 3a, are arranged on the lower substrate 10 and are movable up and down by springs 12. On the upper substrate 13#, a plurality of pins 14 are arranged so as to be movable up and down by springs 15. A plurality of spacers 16 are arranged between the lower and upper substrates 10.13, and these spacers 16 are approximately 0.3 times longer than the sum of the lengths of each component 2.3.
The spacers 16 are precisely machined so that the difference in length between them is 0.01 mm or less. Note that a relief hole 2C is formed in the flange portion 2b of the lower electrode 2 so that it does not engage with the pin 14.

First, before assembling the lower focusing electrode 2 and the upper focusing electrode 3 in the assembly jig, the flat plate 4 is previously joined to the lower focusing electrode 2 at a plurality of welding points 5 by resistance welding. Therefore, the holes 2a and 3a of the lower focusing electrode 2 and the upper focusing electrode 3, which have a slight parallelism error on the upper and lower surfaces, are inserted into the core bar 11, and the upper substrate 13 is pressed against the spacer 16 in close contact with the spacer 16. As a result, the lower focusing electrode 2 is pushed by the stepped portion of the core metal 11 by the biasing force of the spring 12, and its bottom surface is pressed against the upper substrate 13, and the upper focusing electrode 3 is pushed by the spring 12.
The flange portion 3b is pushed by the plurality of pins 141 receiving the urging force, and the top surface is brought into close contact with the upper surface f of the lower substrate 10.

Since the lower substrate 10 and the upper substrate 13 have a high degree of parallelism due to the plurality of spacers 16, the bottom surface of the lower focusing electrode 2 and the top surface of the upper focusing electrode 3, which are in close contact with them, are maintained in a state with high parallelism.

While held in this manner, a laser beam is irradiated from the direction of the arrow 17 to join the upper focusing electrode 3 and the flat plate 4 from the sides at a plurality of welding points 6. Since laser beam welding does not require any mechanical stress, it is possible to assemble parts with high accuracy while maintaining parallelism and coaxiality of holes during setting.

In this way, a plurality of flat plates 4 are placed inside the focusing electrode 1, and the flat plates 4 and the lower and upper focusing electrodes 2.3 are fixed by welding, so that the strength in the axial direction is strong and the parallel Accuracy is maintained.

4 and 5 show a second embodiment of the invention.

In the previous embodiment, the inner diameters of the cups of the lower focusing electrode 2 and the upper focusing electrode 3 were different, but in this embodiment, the inner diameters of the cups are the same, and a stepped flat plate 41 is used instead. In this case, as in the previous embodiment, the upper focusing electrode 3 and the stepped flat plate 41 are previously joined at the welding point 61 by resistance welding, and then the upper and lower focusing electrodes 3.2 are connected to the assembly jig 1. Assemble and join the welding points 51 by laser welding.

Figures WJ6, 7 and 8 show a third embodiment of the present invention. This embodiment shows an example in which the cup inner diameters of the lower and upper focusing electrodes 2.3 are the same, and a horseshoe-shaped bent plate 42 is used. The assembly jig also includes a plurality of springs 18 arranged between the lower and upper focusing electrodes 2.3 instead of the pin 14 and spring 15f shown in FIG.

Therefore, with the E-curved plates 42 in the two lower and upper focusing electrodes 2.3 in contact with each other due to their own elasticity, the core metal 111 is
In this order, the holes 3a, 2a of the upper and lower focusing electrodes 3.2 are inserted, and then a plurality of springs 18 are arranged between the flanges 2b, 3b of the lower and upper focusing electrodes 2.3, and the upper substrate 13 is inserted into the spacer. 16 and press it tightly. In this state, V-za light is irradiated from the directions of arrows 19 and 20 to join the lower focusing electrode 2 and the bending plate 42 at the welding point 52 and the upper focusing electrode 3 and the bending plate 42 at the welding point 62.

Even with this configuration, the same effects as in the embodiment described above can be obtained. Further, in this embodiment, since the bent plate 42 has a horseshoe shape, the gap between the lower focusing electrode 2 and the upper focusing electrode 3 can be closed over almost the entire circumference. From this, it is also possible to extend the length of the focusing electrode 1.

FIG. 9 shows a fourth embodiment of the invention. A case is shown in which the cup inner diameters of the lower focusing electrode 2 and the upper focusing electrode 3 are changed, and a horseshoe-shaped bent plate 42 is used as in the third embodiment. Therefore, the welding point 53 between the lower focusing electrode 2 and the bending plate 42 is prepared in advance.
are joined by resistance welding, and then the assembly jig I is assembled and the welding point 63 between the upper focusing electrode 3 and the bending plate 42 is joined by laser welding. Even with this configuration, the same effects as in the third embodiment can be obtained.

〔Effect of the invention〕

According to the present invention, a plurality of plate-like bodies are inserted inside two cylindrical electrodes, and the two cylindrical electrodes and the plate-like bodies are welded and fixed, so that the strength in the axial direction is strong and the parallel degree is maintained. As a result, a high-quality product with less deterioration of the focus characteristics of the color picture tube can be obtained.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, lal is a perspective view,
(b) is a cross-sectional view, Figure 2 is a perspective view of the flat plate in Figure 1, and Figure 3 is a perspective view of the flat plate in Figure 1.
The figure is a cross-sectional view showing the assembled state of the electron gun electrode structure in Figure 1;
FIG. 4 is a sectional view showing the second embodiment of the present invention, FIG. 5 is a perspective view of the stepped flat plate of FIG. 4, FIG. 6 is a perspective view of the M3 embodiment of the present invention, and FIG. 6 is a perspective view of the bent plate, FIG. 8 is a sectional view showing the assembled state of the electron gun electrode assembly of FIG. 6, and FIG. 9 is a sectional view showing a fourth embodiment of the present invention. 110. Focusing electrode, 2... lower focusing electrode,
2a... Electron beam passing hole, 3... Upper focusing electrode, 3a... Electron beam passing hole, 4... Flat plate, 41... Stepped flat plate, 42... Horseshoe-shaped bent plate, 5 .51.52.53.6.61.62.63・
...Welding point. -＼、Representative Patent Attorney Katsuo Ogawa Figure 1 (a) (b) Figure 3 Figure 4 Figure 5 1'oJ3j time-1f shirk
al: a and i゛1°) 1,000 off 2
: Senmo β blind East fJ out 3: Upper S Goden 42: P, 0 5 bending ° 1 anti 52, et al 2:32 dry 1! . 8th cause n Figure 9

Claims (1)

[Claims] 1. In an in-line electron gun electrode structure for a color picture tube, which is formed by integrally fixing two cylindrical electrodes each having an opening at the bottom and forming an electron lens between the opposing openings,
An in-line electron gun electrode assembly for a color picture tube, characterized in that a plurality of plate-shaped bodies are placed inside the two cylindrical electrodes, and the two cylindrical electrodes and the plate-shaped bodies are fixed by welding.