JPH0549616B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention uses flame to weld and seal the neck of a glass bulb constituting a cathode ray tube and the stem of an electron gun. This invention relates to a welding device for cathode ray tubes, and is particularly characterized by its ring burner.

(Prior Art) Conventionally, as shown in the specification and drawings of Japanese Patent Application No. 60-294375 (unpublished), an electron gun in a cathode ray tube is inserted into a neck portion of a glass bulb, and the electron gun is kept stationary. Then, a ring burner placed around the neck of the glass bulb is swung in the circumferential direction, and the flame radiated from the inner peripheral surface of the ring burner welds the neck and the stem of the electron gun. There is a sealing device for cathode ray tubes that is sealed, a so-called static sealing device.

As shown in the above specification and drawings, this static sealing device consists of a bulb holder that holds a glass bulb, a mount chip that holds an electron gun at a prescribed position within the neck of the glass bulb, and a mount chip that holds the electron gun at a specified position within the neck of the glass bulb. It consists of a ring burner, etc. that repeats forward and reverse rocking motion at a predetermined rotation angle along the outer periphery.

Hereinafter, the conventional ring burner will be explained in detail. As shown in FIGS. 4 and 5,
A ring burner 13 is arranged around a neck portion 12a of a glass bulb 12 into which an electron gun 11 in a cathode ray tube is inserted. A large number of openings 14 are arranged on the inner peripheral surface of the ring burner 13 at regular intervals. Then, a flame 15 is emitted horizontally from each of the openings 14 toward the center of the tube axis, and the flame 15 of the burner burns a prescribed position of the neck portion 12a, and as shown in FIG. 1
It is welded to the stem portion 11a of No. 1.

At this time, a large number of flames 15 emitted from the inner circumferential surface of the ring burner 13 collide perpendicularly with the outer circumferential surface of the neck portion 12a from the front, so the flames 15 may interfere with each other (overlap). The temperature of the neck portion 12a rises abnormally, and the flame 15 collides head-on with the neck portion 12a, causing the flame 15 to expand at the impact surface, resulting in the neck portion 12a being burnt over a wide area. Therefore, the internal temperature of the neck portion 12a rises abnormally, and the temperature of the metal parts of the electron gun 11 also rises abnormally, causing a strong oxidation phenomenon in the metal parts. As a result, the emission quality, which is an important characteristic of cathode ray tubes, deteriorates.

Also, the ring burner 13 has a neck portion 12a.
When the wire is burned, the burnt portion of the neck portion 12a gradually softens, and the lower neck portion begins to fall from that portion. This falling part is called a cullet 16. The softened portion becomes thinner and the stem portion 11a
is welded to. After this welding, the cullet 16
is cut. The welded portion between the neck portion 12a and the stem portion 11a is further burnt to stabilize its shape so that good quality is maintained.

However, as described above, a large number of flames are radiated from the front to the entire circumferential surface of the neck portion 12a from the large number of openings 14 arranged on the inner circumferential surface of the ring burner 13, so that the flames interfere with each other. As a result, the flame spreads significantly on the surface of the neck portion, causing the neck portion 12a to soften over a wide range and increase the thickness of the welded portion.
This makes it difficult to cut the cullet 16, and the welded portion is thick, so the neck portion 12
Welding between a and the stem portion 11a tends to be insufficient, and there is a risk of damage starting at the welded portion.

(Problems to be Solved by the Invention) As described above, in the conventional ring burner 13, the flame 15 emitted so as to interfere with each other on the entire circumferential surface of the neck portion 12a
When the temperature of the electron gun 11 rises abnormally, the temperature of the electron gun 11 also rises abnormally, causing a problem that strong oxidation occurs in the components of the electron gun.

Furthermore, as mentioned above, the thickness of the welded part tends to become thicker, making cutting difficult.
There is a problem that the welding state between the neck portion 12a and the stem portion 11a is insufficient.

In order to solve the conventional problems in the welding and sealing process of cathode ray tubes, the present invention divides the flame emission direction of the burner chip of the ring burner into multiple directions in which the flames do not interfere with each other.
The purpose is to improve sealing quality and yield.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides for a ring burner disposed around the neck portion 12a of the glass bulb 12 in which the electron gun 11 of the cathode ray tube is inserted relative to the neck portion 12a. The ring burner is used to rotate the neck part 12a and the stem part 1 of the electron gun 11.
1a, the ring burner 21 has a plurality of burner chips 23 in a ring-shaped burner holder 22, and a plurality of flame emission directions that can avoid interference between flames. It is divided and provided at different locations.

(Function) According to the present invention, the flame 36 emitted from the burner chip 23, which is divided into a plurality of directions so that the flame emitting directions do not interfere with each other, is transmitted to the outer peripheral surface of the neck portion 12a by the rotation of the ring burner 21. , the circumferential surface of the neck portion 12a can be heated evenly, and excessive heating and flame expansion in the case where the flames 36 are radiated so as to interfere with each other are prevented, thereby preventing abnormal temperatures inside the neck portion. There is no increase in temperature, and oxidation of electron gun parts due to high temperature heating is prevented. In addition, since there is no flame expansion unlike in the conventional case, the part of the neck part 12a to be welded is locally softened, and the wall thickness of the welded part becomes thinner, making it easier to cut and making it easier to weld with the stem part 11a. will be carried out reliably.

(Example) Hereinafter, the present invention will be explained in detail with reference to the example shown in FIGS. 1 to 3.

As shown in FIG.
1, a plurality of burner chips 23 are provided in a ring-shaped burner holder 22 which is divided into two parts due to the sealing machine and burner mounting mechanism.

Each burner chip 23 is divided into equal positions to provide a plurality of flame emission directions in which interference between flames can be avoided. In Figure 1, 4
Although it is provided by being divided in one direction, it may be provided by being divided in three directions. The burner chips 23 shown in FIG. 1 constitute one group of three burner chips for each flame emission direction, and are configured to concentrate a strong flame in each direction.

A mixed gas supply pipe 24 is connected to each of the two divided burner holders 22, and the mixed gas (mixture of natural gas and oxygen) supplied through the pipe 24 is supplied as shown in FIG. Gas passage 25 formed inside burner holder 22
is pumped to.

Furthermore, each burner chip 23 is attached to the upper surface of the burner holder 22 by a bolt 26 so that the flame radiation angle can be adjusted, and the flame radiation angle of each burner chip 23 is set in the tangential direction of the neck portion 12a or the stem portion 11a. It is set towards.

As shown in FIG. 3, the shaft portion 2 of the bolt 26
The base 23a of the burner tip 23 is rotatably fitted into the burner tip 6a, the bolt shaft 26a is screwed into the upper part of the burner holder 22, and the bolt 26 is used to tighten and fix the burner tip base 23a. Therefore, by loosening this bolt 26, the direction of the burner tip 23 can be adjusted.

The gas passage 25 in the burner holder 22
These include an axial through hole 31 drilled in the shaft portion 26a of the bolt 26, a radial through hole 32, and an annular groove 33 provided in the inner circumferential surface of the burner tip base 23a.
It communicates with the inner hole 34 of the burner tip 23 through. Such a gas supply path is connected to each burner chip 2.
3, the mixed gas supplied from the mixed gas supply pipe 24 to the gas passage 25 is injected from the tip opening 35 of each burner chip 23 via the gas supply path, and is ignited. This results in a flame 36 as shown in FIG.

Then, flames 36 are emitted from the burner chips 23, which are grouped in three or four directions, toward the vicinity of the outer periphery of the stem portion 11a so that the flames do not interfere with each other. The length of this flame 36 is set to be slightly longer than the distance to the central axis of the neck portion 12a, so as to create an elongated and sharp flame.

The inner diameter of the opening 35 at the tip of the burner tip 23 is determined by the length of the flame 36. Usually, a small hole is formed with a diameter of 0.6 to 1.2 mm.

The flame 36 is caused by the neck portion 12a or the stem portion 1.
Since it is radiated in the tangential direction of 1a, the
Compared to the case where radiation is emitted from the front to a, the neck part 1
The flame expansion (thermal radiation) on the surface of the electron gun 2a in the tube axis direction is reduced, and the temperature rise of the metal parts of the electron gun 11 is accordingly reduced, and the oxidation level is weakened.

Further, since the burner chip 23 is set to be divided into the minimum number of parts in order to avoid flames from interfering with each other, there is no risk that the neck part 12a will be burnt widely and the thickness of the welded part will become thick as in the conventional case. Therefore, cutting becomes easy and the neck part 1
The welding between the welding part 2a and the stem part 11a can be performed with good familiarity, and the quality of the emitter is stabilized, and damage to the welded part is reduced, and the yield is improved.

〔Effect of the invention〕

According to the present invention, a ring-shaped burner holder is provided with a plurality of burner chips divided into positions where a plurality of flame radiation directions can be obtained to avoid interference between flames. It is possible to prevent the risk of abnormal temperature rise due to flames that interfere with each other, and the oxidation level of the electron gun can be significantly reduced, making it possible to stabilize the emission quality, which is an important characteristic of cathode ray tubes. . In addition, only the part of the neck to be welded is intensively heated by the flame, which is prevented from spreading, and only the welded part becomes thin and softened, making it easier to cut the cullet caused by heating and softening. , the welded shape is stable, there is less risk of damage due to poor shape or large distortion, and this can contribute to improved yield.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the cathode ray tube sealing device of the present invention, FIG. 2 is a cross-sectional view thereof, FIG. 3 is a cross-sectional view of the burner chip mounting part, and FIG. 4 is a conventional sealing device. FIG. 5 is a perspective view of the attaching device and a sectional view showing the state in which the neck portion of the cathode ray tube is welded to the stem portion. 11...electron gun, 11a...stem part, 12...
...Glass bulb, 12a...Network part, 21...
Ring burner, 22... Burner holder, 23...
Burna tip.

Claims (1)

[Claims] 1. A ring burner provided around the neck portion of a glass bulb in which an electron gun is inserted is rotated relative to the neck portion of the glass bulb in a cathode ray tube. In a sealing device for a cathode ray tube in which a part and a stem part of an electron gun are welded and sealed, the ring burner has a ring-shaped burner holder, and a plurality of burner chips are arranged in a ring-shaped burner holder, and a plurality of burner chips are arranged in a ring-shaped burner holder to prevent interference between flames. 1. A sealing device for a cathode ray tube, characterized in that the sealing device is divided and provided at positions where the direction of flame radiation can be obtained. 2. The sealing device for a cathode ray tube according to claim 1, wherein the burner tip is set such that the flame emission angle is directed in the tangential direction of the neck portion or the stem portion. 3. The sealing device for a cathode ray tube according to claim 1, wherein the burner chip is attached to the burner holder so that the angle of flame radiation can be adjusted. 4. The cathode ray tube sealing device according to claim 1, wherein a plurality of burner chips are provided in groups for each flame emission direction.