JPS61212495A - Production of color selecting electrode for cathode ray tube - Google Patents

Abstract

PURPOSE:To improve the accuracy of a product by bringing a color selecting electrode into tight contact with a frame by the air blown out of a nozzle and executing a welding treatment while floating lens units from the color selecting electrode. CONSTITUTION:A condenser lens 22 and a protective glass plate 23 are provided to lens units 13, 14 and an air nozzle 24 is integrally provided to the top end. A contracted part 28 is formed to the nozzle end and laser beams 16A, 16B condensed by the lens 22 are radiated through the center of a nozzle aperture 26. An aperture grill constituting body 9 is placed on a frame 5 on a welding base and the lens units 13, 14 are set thereto. Welding is then executed by irradiating the beam 16A, 16B while the air 30 is blown out of the air nozzle 24. The units 13, 14 are alightly floated by the air pressure and are held without contact with the body 9. The body 9 contacts tightly with the frame 5. There is therefore no deformation of the electrode and the accuracy is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a color selection electrode for a cathode ray tube, and more particularly to a welding method for welding the color selection electrode to a frame.

[Summary of the invention]

In manufacturing color selection electrodes for cathode ray tubes, when welding the color selection electrodes to the frame, air is blown out from the tip of the lens unit of a laser welding gun to simultaneously bring the color selection electrodes into close contact with the frame. , by lifting the lens unit from the color selection electrode and welding it,
This allows for good laser welding.

[Conventional technology]

The color selection electrode of a color cathode ray tube, for example, the so-called aperture grill formed with many slits, is composed of a pair of opposing support members +1), +2) and a U-shaped connection that supports both ends of the support members, as shown in FIG. An aperture grill structure consisting of a metal thin plate in which a large number of slits (6) are formed on a metal frame (5) consisting of members (3) and (4), and each metal strip (7) between them is connected at the periphery. (9), and after fixing them together by welding, the connecting portion (8) around the aperture grill structure (9) is removed.

Conventionally, resistance seam welding is used for welding, and the frame (5) and aperture grill structure (9) are welded together using pressure applied by a welding electrode.
) were in close contact with each other.

[Problem that the invention seeks to solve]

On the other hand, in high-definition color cathode ray tubes, the aperture grill itself is also formed with high precision from a thinner metal plate. When welding such a high-precision aperture grill, conventional resistance seam welding (so-called contact welding) tends to deform the aperture grill, so laser seam welding, which can be welded without contact, is preferable. However, since this laser seam welding is non-contact, there is a problem in that the aperture grill and the frame do not come into close contact and good welding cannot be performed.

In view of the above-mentioned points, the present invention provides a method of manufacturing a color selection electrode for a cathode ray tube, which allows the color selection electrode to be well welded to the frame by laser seam welding.

[Means for solving problems]

The present invention provides a lens unit (13) for a laser welding gun.
(14) are arranged to be movable in the laser irradiation direction, and air nozzles (24) are integrally provided at the tips of the lens units (13) and (14). When welding the color selection electrode (9) to the frame (5), air (30) is blown out from the air nozzle (24) to weld the color selection electrode (9) to the frame (5).
) on the frame (5), and at the same time attach the lens unit I.
- An air nozzle (
24) is formed in a shape having a constriction (28) in front of the nozzle tip (inward position) such that the opening diameter D2 (Di>D2) is smaller than the tip opening diameter D1. In addition, laser welding is performed continuously so that adjacent welded portions (31) partially overlap.

[Effect]

The air pressure blown out from the air nozzle (24) ensures that the color selection electrode (9) is in close contact with the frame (5), and the lens units (13) and (14) are connected to the color selection electrode (
9) It stands out more. In this non-contact state, the air nozzle (
24) passes through the center of the laser beam (16A) (
16B> is irradiated, and the color selection electrode (9) is connected to the frame (
5) Good welding. The welded part (31) after welding is cooled by the air flow from the air nozzle (24). Also,
Metal vapors generated during welding are also removed by the air flow.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a method for manufacturing a color selection electrode for a cathode ray tube according to the present invention will be described with reference to the drawings.

FIG. 1 shows an overall view of a laser welding machine applied to the present invention. In the figure, (5) and (9) are the frame and aperture grill structure to be welded placed on the welding table (11), (12) is the laser oscillation unit, (13) and (
Reference numeral 14) indicates a lens unit constituting a laser welding gun that focuses a laser beam from the laser oscillation unit (12) and irradiates the part to be welded.

The frame (5) consists of a pair of opposing support members (1) and (2) on which the aperture grill structure (9) is to be disposed, and a U-shaped U-shaped support member supporting both ends of the frame (5). It consists of connecting members (3) and (4). Similarly, the aperture grill structure (9) is made of a thin metal plate with a thickness of, for example, 100 μm, with a large number of slits (6) formed therein, and a large number of metal strips (η) arranged in the horizontal direction. The strips are connected at connecting portions (8) around them.

The laser oscillation unit (12) has, for example, a YAG laser device (15) as shown in FIG.
17) and a lens system (18). These two divided laser beams (16A) and (16B)
are supplied to the respective lens units (13) and (14) through optical fibers (19A) and (19B), respectively. The lens units (13) and (14) are supported by a support (20) of a three-dimensional drive system. That is, the lens units (13) and (14) are attached to the axis (21) of the support (20).
) is disposed so as to be movable in the direction 2 perpendicular to the surface of the aperture grill structure (9) to be welded, and movable along the longitudinal direction Y on the support members (1) (2) of the frame. will be distributed.

Further, both lens units (13) and (14) are arranged so as to be movable in the direction X perpendicular to the longitudinal direction Y. As shown in the enlarged view of FIG. 3, the lens units (13) and (14) have a built-in condensing lens (22) and a tip portion from which the laser beams (16A) (16B) are emitted, that is, a protective glass plate ( An air nozzle (24) is attached to the tip of the air nozzle (23).
) are integrally provided. The air nozzle (24) is provided with an air introduction part (25) on the side, and the cross-sectional shape of the nozzle end has a diameter D2 smaller than the diameter D1 of the tip opening (26) in front of the tip.
(Dl > D2) It is configured to have a shape having a constriction (28) forming an opening (27). Lens unit (13) (14) (7) Condenser lens (2)
The laser beams (16A) (16B) focused in step 2) are emitted through the center of the nozzle opening (26).

Therefore, in this embodiment, the frame (5) and the aperture grill structure (9) are welded using such a laser welding machine. That is, first, the frame (6) is welded on the welding table (11). ), and the aperture grill structure (9) is placed on the frame (5) so as to span the support members (1) and (2). Next, as shown in FIG. 5, the lens units (13) and (14) were brought to the center position (symbol ■) of the support members (1) and (2), respectively, and then lowered.
While blowing out air (30) from the air nozzle (24), the laser beams (16A) and (16B) are irradiated onto the part to be welded. Then, the laser beam (16A) and (16
B) while irradiating lens units (13) and (1).
4) toward one end of the support members (1) and (2), and after welding to the end (symbol ■), the lens units (13) and (14) are brought back to the center position. The lens unit is moved from the position (symbol ■) toward the other end while irradiating the laser beam (symbol ■).

When the ends are welded, they are brought to the center position again (symbol ■).During this welding, air at a pressure of, for example, 4 kg/cd is introduced from the air introduction part (25), and when it is blown out from the nozzle tip, the air nozzle Together with the above special shape of (24), lens units) (13) and (14) float,
For example, the distance d=Q from the surface of the aperture grill structure (9)
Just leave Jm. At the same time, this air pressure brings the welded portion of the aperture grill structure (9) into close contact with the surfaces of the support members (1) and (2) of the frame (5). At this time, the adhesion is significantly improved to 20 μm or less. Lens unit (1
3) and (14), support members (1) and (
2) It is better to start from the center position.

In this way, the part of the aperture grill body (9) to be welded is brought into close contact with the frame (5) by the air pressure from the nozzle (24), so that laser seam welding becomes possible.

Moreover, the lens units (13) and (14) float due to the air blown from the nozzle (24) and do not come into contact with the aperture grill structure (9), so welding can be performed without deforming the aperture grill structure (9).

Further, metal vapor generated during welding is removed to the outside by the airflow and does not adhere to the protective glass plates (23) of the lens units (13) and (14). Furthermore, the welded portion after welding is rapidly cooled by air flow.

On the other hand, welding is performed on adjacent welded parts (as shown in Figure 6).
When the welding parts (31) are welded so that they partially overlap (approximately 30%), the welding strength increases and the welding part (31) and the unwelded part The boundary becomes a so-called perforation, and after welding, as shown in Figure 4, the unnecessary part, that is, the connection part (
By pulling it in the direction of arrow F from the end of 8), it becomes possible to cleanly peel it off from the welded area (so-called trimming operation).

〔Effect of the invention〕

According to the present invention described above, the air nozzle (24) is integrated with the lens unit (13) (14) of the laser welding gun, and the blown air (
30), the color selection electrode (9) is brought into close contact with the frame (5), and the lens units (13) and (14) are raised above the color selection electrode (9), so non-contact laser seam welding can be performed satisfactorily. Since it is non-contact, the color selection electrode (9) will not be deformed during welding.
In addition, since the metal vapor generated during welding is removed by the air flow from the nozzle (24), the lens unit (13)
The protective glass plate (23) of (14) is not contaminated with metal vapor, and after welding, the welded portion is quickly cooled by airflow.

Therefore, the present invention is particularly suitable for application to the manufacture of high-precision color selection electrodes used in high-precision color cathode ray tubes.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the entire laser welding machine used in the method of manufacturing color selection electrodes for cathode ray tubes of the present invention, Fig. 2 is a configuration diagram showing an example of the lens unit, and Fig. 3 is the lens unit. 4 is a perspective view showing the trimming state after welding, FIG. 5 is a side view showing the operating state, FIG. 6 is a perspective view of the main part showing the welded part, and FIG. 7 is a perspective view showing the trimming state after welding. FIG. 2 is a perspective view of a frame and an aperture grill structure for explanation. (5) is a frame, (9) is a color selection electrode, (12) is a laser oscillation unit, (13) and (14) are lens units, and (24) is an air nozzle. 1 so, uni, t n payment marukuchihaku 3 drawings

Claims (1)

[Claims] When welding the color selection electrode to the frame, the lens unit of the laser welding gun and the air nozzle are integrated, and the color selection electrode is brought into close contact with the frame by air blown from the air nozzle, and the lens unit is welded to the color. A method for manufacturing a color selection electrode for a cathode ray tube, characterized in that the welding process is carried out while the selection electrode is raised above the selection electrode.