JPH0660808A - Manufacture of electron gun structure - Google Patents

Abstract

PURPOSE:To provide a method for manufacturing electron gun structure having stabilized welding strength and improved reliability by preventing the generation of a burr on a side where a cylindrical member is brought into tight contact, reducing a process time, and remarkably reducing deformation or the like. CONSTITUTION:In manufacturing electron gun structure, a band-like element material 4 is press-cut into a strap member 7 of a predetermined dimension. The strap member 7 is bent into an approximately arcuate shape in such a manner that a burr at the cut surface thereof is located outside, thus obtaining a strap 18. Thereafter, the outer peripheral surface of a cylindrical member is brought into tight contact with the inner circumferential surface 19a of the approximately arcuate portion 19 of the strap 18. A laser beam is radiated from the outer peripheral surface of the approximately arcuate portion so that the strap is welded to the cylindrical member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electron gun assembly used in a television receiver or the like, and more particularly to a method for joining a cylindrical member and a strap.

[0002]

2. Description of the Related Art Generally, in an electron gun assembly used for a television receiver or the like, a strap 2 is joined to a cathode supporting cylinder-1 which is a cylindrical member, as shown in FIGS. 3 (a) and 3 (b). . In this case, the cathode support cylinder-1
The inner peripheral surface of the substantially Ω-shaped portion 3 of the strap 2 is laid on the outer peripheral surface of the
It is joined by the welding. The crosses in the figure are welding points. The strap 2 supports an electrode such as a cathode or a cylindrical member that fixes this electrode.

The manufacturing of such a strap 2 is conventionally performed by the steps shown in FIGS. 4 (a) and 4 (b). (A) is a plan view, (b) is a side view,
Arrows indicate the order of steps. First, a hole 5 to be a notch (described later) is made in the band-shaped material 4 by a punching process. Next, in the side slitting process, both side surfaces of the strip-shaped material 4 are tooled 6
By press cutting to a predetermined size to form a narrow strap material 7. Next, in the cutting step, the strap material 7 is cut into a predetermined length with the tool 8 and sent to the next forming step. When cutting a predetermined length, it is cut just at the hole 5, so that the hole 5 becomes a notch 9.

In the molding process, as shown in FIG. 5, the strap material 7 cut to a predetermined length in the cutting process is press-molded by a molding die 10 and a molding punch 11 to form an outer peripheral surface of the cathode supporting cylinder-1. The substantially Ω-shaped portion 3 to be joined is bent and molded to obtain the strap 2 shown in FIG. Approximately Ω-shaped part 3
The inner peripheral surface is 3a and the outer peripheral surface is 3b. In this case, using a progressive die (the above-mentioned forming die 10 and forming punch 11) capable of continuous production in press forming, the amount of feeding the strap material 7 is determined by the feeding device, and the shape is formed in each step. Is being shaped.

By the way, burrs 12 as shown in FIG. 7 are generated when press cutting is performed in the side slit process. However, due to the shape of the strap 2, the cathode supporting cylinder -1 of the substantially Ω-shaped portion 3 of the Ω-shaped portion 3 is formed after the molding process. The side that contacts the outer peripheral surface, that is, approximately Ω
The inner peripheral surface 3a of the shaped portion 3 faces the burr 12 and the substantially Ω shaped portion 3
No burr 12 is located on the outer peripheral surface 3b. This burr 12
In order to remove the above, a tumbling step (not shown in FIG. 4) of performing barrel polishing is performed after the molding step. afterwards,
As shown in FIG. 8, the strap 2 is joined to the outer peripheral surface of the cathode supporting cylinder-1 by laser welding. The inside of the circle in the drawing is an enlarged view taken along the line AA ′ and viewed in the direction of the arrow.

[0006]

In the conventional die structure, burrs 12 are generated in the side slit process, but it is impossible to completely remove the burrs in the tumbling process. If tumbling is performed for a long time to remove burrs, it may cause deformation of the strap 2. Then, in the final step, the strap 2 is joined to the outer peripheral surface of the cathode supporting cylinder-1 by laser welding, but the burr 12 is formed on the inner peripheral surface 3a side of the approximately .OMEGA.-shaped portion 3 in contact with the outer peripheral surface of the cathode supporting cylinder-1. Is located, a gap is generated between the cathode supporting cylinder-1 and the strap 2 to cause a problem.

In the laser welding in this case, as shown in FIG. 8, the laser light 13 sent from the optical fiber passes through the lens 14 and is focused. And the focused rays
The light 15 is intended to melt the approximately Ω-shaped portion 3 of the strap 2 and weld it to the cathode supporting cylinder-1, but there is a gap due to the burr 12 between the cathode supporting cylinder-1 and the strap 2. , Welding strength may be weak or may come off.

The present invention has been made in view of the above circumstances. There is no burr on the side where the cylindrical member is in close contact, the process time is shortened, deformation is drastically reduced, and welding strength is stabilized and reliability is improved. It is an object of the present invention to provide a method for manufacturing the electron gun assembly.

[0009]

According to the present invention, a strap material having a predetermined size is press-cut from a band-shaped material, and the strap material is then folded into a substantially Ω shape so that a burr on the cut surface is located outside. Bend to get the strap, then
The outer peripheral surface of the cylindrical member is brought into close contact with the inner peripheral surface of the substantially Ω-shaped portion of the strap, and laser light is irradiated from the outer peripheral surface side of the substantially Ω-shaped portion to weld the strap and the cylindrical member. It is a manufacturing method.

[0010]

According to the present invention, there is no burr on the side where the cylindrical member is in close contact, and there is no need for tumbling for a long time. Therefore, the process time is reduced, and the deformation is drastically reduced. Also in the welding process, since the strap is in close contact with the outer peripheral surface of the cylindrical member so that the characteristics of the laser can be utilized, the welding strength is stable and does not come off, and the quality of the electron gun assembly is improved. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

The method of manufacturing an electron gun assembly according to the present invention is constructed as shown in FIGS. 1 and 2, and the same parts as those in the conventional example (FIGS. 3 to 8) are designated by the same reference numerals to support a cathode as a cylindrical member. A cylinder will be described as an example. As described in the conventional example, the cathode supporting cylinder and the strap are joined by laser welding. Before that, a method of manufacturing the strap will be described first.

This strap manufacturing method includes a pulling step, a side slitting step, and a cutting step as in the conventional example.
Since these steps are exactly the same as those in the conventional example, description thereof will be omitted. Subsequently, the strap material 7 cut to a predetermined length in the cutting step is press-molded by the molding die 16 and the molding punch 17 as shown in FIG. 1 to obtain the strap 18. In this case, as is apparent from FIG.
The forming punch 17 and the forming punch 17 are different in structure from the conventional ones, and are configured so that burrs are not located on the side where the inner peripheral surface 19a of the substantially Ω-shaped portion 19 of the strap 18, that is, the outer peripheral surface of the cathode supporting cylinder-1 is in close contact. . This forming die 16 and forming punch 17
Is used to press-mold the strap 18 from the strap material 7 (see FIG. 4). That is, the substantially Ω-shaped portion 19 is formed by bending and forming into a substantially Ω-shaped portion. Therefore, in the present invention, the burr is located on the outer peripheral surface 19b of the substantially Ω-shaped portion 19.

The strap 18 thus formed and the cathode supporting cylinder-1 are laser-welded as shown in FIG. That is, as shown in FIG. 2, the laser light 13 sent from the optical fiber is passed through the lens 14 and focused. Then, the focused laser light 15 is applied to the outer peripheral surface 19b of the substantially .OMEGA.-shaped portion 19 of the strap 2 to melt the substantially .OMEGA.-shaped portion 19 and the cathode supporting cylinder-1 and weld them together. In this case, the inner peripheral surface 19a of the approximately Ω-shaped portion 19 of the strap 18
Since there is no burr on the cathode support cylinder-1, no gap is formed between the strap 18 and the cathode support cylinder-1, and the strap 18 and the cathode support cylinder-1 are welded in a completely adhered state. still,
The inside of the circle in the drawing is an enlarged view taken along the line AA ′ and viewed in the direction of the arrow. In the above-mentioned embodiment, the cathode supporting cylinder-1 was given as an example of the cylindrical member, but it goes without saying that the cylindrical member is not limited to the cathode supporting cylinder-1.

[0015]

According to the present invention, a strap is obtained by bending and forming into a substantially Ω shape so that the burr is located outside.
After that, the outer peripheral surface of the cylindrical member is brought into close contact with the inner peripheral surface of the Ω-shaped portion of the strap, and laser light is emitted from the outer surface side of the Ω-shaped portion to weld the strap and the cylindrical member. No need for time tumbling. Therefore, the process time is reduced, and the deformation is drastically reduced. Also, in the welding process,
Since the strap is in close contact with the outer peripheral surface of the cylindrical member so as to make the best use of the characteristics of the z, the welding strength is stable, and the electron gun assembly quality is improved without coming off.

[Brief description of drawings]

FIG. 1 is a sectional view showing a method of manufacturing an electron gun assembly according to an embodiment of the present invention (strap molding step).

FIG. 2 is a method for manufacturing an electron gun assembly according to an embodiment of the present invention (laser welding between a cathode supporting cylinder and a strap).
FIG.

3 (a) and 3 (b) are a plan view and a side view showing a joined state of a cathode supporting cylinder and a strap in an electron gun assembly.

4A and 4B are a plan view and a side view showing a conventional method of manufacturing an electron gun assembly (each step of manufacturing a strap).

FIG. 5 is a cross-sectional view showing a conventional method for manufacturing an electron gun assembly (strap molding step).

FIG. 6 is a side view showing a strap obtained by a conventional manufacturing method.

FIG. 7 is an enlarged sectional view showing a burr in the case of a conventional manufacturing method.

FIG. 8 is a cross-sectional view showing a conventional method of manufacturing an electron gun assembly (laser welding between a cathode supporting cylinder and a strap).

[Explanation of symbols]

1 ... Cathode support cylinder- (cylindrical member), 4 ... Strip material,
7 ... Strap material, 13, 15 ... Laser light, 16 ... Molding die, 17 ... Molding punch, 18 ... Strap, 19 ... Almost Ω-shaped portion, 19a ... Inner peripheral surface of substantially Ω-shaped portion, 19b ... Almost Ω The outer peripheral surface of the groove.

Claims (1)

[Claims] 1. A strap material having a predetermined size is press-cut from a band-shaped material, and the strap material is then bent into a substantially Ω shape so that a burr on the cut surface is located outside to obtain a strap. Thereafter, the outer peripheral surface of the cylindrical member is brought into close contact with the inner peripheral surface of the substantially Ω-shaped portion of the strap, and laser light is irradiated from the outer peripheral surface side of the substantially Ω-shaped portion to separate the strap and the cylindrical member. A method for manufacturing an electron gun assembly characterized by welding.