JP2995807B2 - Welding equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for accurately positioning a front container and a rear container when producing a video display tube.

2. Description of the Related Art In recent years, plasma displays, fluorescent display panels, thin CRTs
Various video display tubes such as a display tube have been proposed. Although the details of these picture display tubes differ depending on the operating principle, the front container made of glass and the back container made of metal or glass material are joined with frit glass, and the inside of the tube is evacuated and the inside is evacuated. An electrode is provided at an appropriate place, an electric signal is applied to the electrode, and a structure displaying an image responding to the electric signal is common.

The front and back containers of these image display tubes are subjected to chemical processing necessary for image display prior to joining with frit glass.
Needless to say, pre-processing such as coating or planting necessary parts is completed.

FIG. 2 is a side view of a conventional example, and FIG. 3 is a plan view in the direction of arrows A to A 'in FIG. However, FIG. 3 is a view in which the holding block 5 shown in FIG. 2 is removed for easy understanding. FIG. 4 shows arrows B to B 'in FIG.
FIG. A conventional example in which the front and rear containers of the image display tube are joined with frit glass will be described with reference to these drawings. Clamper 1 with back container 3 against base 6
Fix with. The front container 2 is placed on the back container 3, and the frit glass 8 is evenly applied to the periphery of the front container 3 where the front container 2 contacts the back container 3. Thereafter, the holding block 5 is placed on the front container 2, and the base 6 is inclined as shown in FIG. 2 and put in a high-temperature furnace to melt the frit glass 8 and join the front container 2 and the back container 3. Let it. In this case, it is necessary to accurately match the relative positions of the front container 2 and the back container 3. For this purpose, the positioning stopper 4 is arranged as shown in FIG. As described above, since the base 6 is inclined and the frit glass 8 is melted at a high temperature in the furnace, the front container 2 tends to slide down in the direction of arrow C due to the weight of the holding block 5. As a result, the peripheral end of the front container 2 comes into contact with the positioning stopper 4 so that accurate positioning of the back container 3 and the front container 2 can be performed.

Problems to be Solved by the Invention In the conventional example described above, the positioning stopper 4 is made of a metal material. Since the frit glass is easily bonded not only to the glass material but also to the metal material, the frit glass 8 is often bonded to the positioning stopper 4 after coming out of the high-temperature furnace. Therefore, when the front container 2 and the back container 3 that have been joined are removed from the base 6, a crack is generated in the frit glass 8 that is joined to the positioning stopper 4, and the front container 2 and the back container 3 that are bent and joined by the crack Cracks also occur at the joint surface of In severe cases, the outer container 2 may be cracked. As described above, the inside of the image display tube must be maintained at a vacuum. However, if a crack is generated at the joint surface between the front container 2 and the back container 3, the vacuum cannot be maintained. This is even more so.

As described above, the conventional positioning stopper 4 made of a metal material has a problem that it is difficult to prevent a crack at the joint surface between the front container 2 and the rear container 3.

Therefore, an object of the present invention is to provide a welding device that does not cause a crack in a joint surface between a front container and a back container and that can accurately position the front container and the back container.

Means for Solving the Problems The present invention, in order to achieve the above object, comprises a positioning stopper for positioning the two containers, in the welding device to join the two containers using frit glass,
The positioning device is characterized in that the main body is made of a metal material and the tip is made of boron nitride or graphite.

Operation Since the present invention is configured as described above, when the frit glass passes through a high-temperature furnace and melts, the frit glass joins the two containers, but does not join with the positioning stopper. Therefore, when the two containers that have been joined are removed, no crack is generated in the joint surface of the two containers that have been joined. As a result, the production yield can be significantly improved.

FIG. 1A is a plan view of a positioning stopper 4 used in the welding device of the present invention, and FIG. 1B is an arrow D- in FIG. 1A.
It is sectional drawing in D '. The body part b shown in FIG. 1B is made of metal, but the tip a for contacting the container is made of boron nitride or graphite.

Boron nitride or graphite has a characteristic that it has heat resistance and is hardly bonded to frit glass. However, it has the disadvantage that it is more brittle than metal and has lower mechanical strength than metal material. Therefore, as shown in FIG. 1B, the insufficiency of the mechanical strength of the contact tip a is compensated for by the metal part of the body b so that the protrusion of the contact tip a and the recess of the body b are fitted. ,
In addition, the use of boron nitride or graphite in the contact portion with the frit glass significantly reduces the bonding property with the frit glass.

The present invention uses the positioning stopper 4 configured as described above, so that when passing through a high-temperature furnace, the end of the front container comes into contact with the positioning stopper 4 so that accurate positioning can be performed. In addition, since the frit glass and the positioning stopper 4 are not joined, it is possible to prevent the occurrence of cracks at the joint surface between the front container and the back container when removing the front container and the back container after the joining operation.

Although the case where the back container is made of a metal material has been described in the present embodiment, it goes without saying that the same effect can be obtained when the back container is made of a glass material.

Further, in this embodiment, an example is shown in which the contact tip a of boron nitride or graphite and the main body b of the metal material are assembled by fitting them in a convex or concave manner. For example, a method of assembling b with screws may be employed. Further, the metal material may be a ceramic material having sufficient mechanical strength.

Effect of the Invention In the present invention, since the abutting tip of the positioning stopper is made of boron nitride or graphite as described above, when the frit glass passes through a high-temperature furnace and melts, the frit glass joins the two containers. However, it does not join with the positioning stopper. Therefore, when the two containers that have been joined are removed, no crack is generated in the joint surface of the two containers that have been angle-joined. As a result, the production yield can be significantly improved.

[Brief description of the drawings]

1A is a plan view of a positioning stopper according to one embodiment of the present invention, FIG. 1B is a cross-sectional view taken along arrows D-D 'of FIG. 1A, FIG. 2 is a side view of a conventional example, and FIG. Is the arrow A in FIG.
FIG. 4 is a cross-sectional view taken along arrows B-B ′ in FIG. 4. Positioning stopper, a ... Contact tip, b ...
Main body.

Claims (2)

(57) [Claims] 1. A welding device comprising a plurality of positioning stoppers and joining two containers by using frit glass, wherein the positioning stopper has a main body made of a metal material, and has a contact tip that comes into contact with the container. A welding device comprising boron nitride, wherein the tip portion is detachable from the main body portion. 2. The welding device according to claim 1, wherein the contact tip of the positioning stopper is made of graphite.