JPS63210045A - Device for sealing cathode-ray tube - Google Patents

Abstract

PURPOSE:To obtain the title sealing device capable of preventing an abnormal temp. raise at a neck part and capable of remarkably reducing the oxidation level of an electron gun, by separately arranging the plural burner tips of a ring burner for welding the neck part and the stem part of the electron gun at the positions where the mutual interference between the flames can be avoided. CONSTITUTION:The burner tips 23 are separately arranged in plural directions so that the flame projecting directions do not interfere with each other, and a flame 36 is ejected from the tips. Since the flame 36 is moved along the outer peripheral surface of the neck part 12a by the rotation of the ring burner 21, the peripheral surface of the neck part 12a is uniformly heated. Excessive heating caused when the flames 36 are ejected and interfere with each other can be eliminated, and also the expansion of the flame can be prevented. By this method, since the abnormal temp. raise in the neck part 12a is eliminated, the oxidation due to the heating of the electron gun parts at high temp. is prevented. As the flame does not expand unlike the conventional method, the welded part of the neck part 12a is locally softened, the thickness of the welded part is decreased, cutting is facilitated, and the neck part can be surely welded to the stem part 11a.

Description

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

(Prior art) Previously, the light n of Japanese Patent Application No. 60-294375 (unpublished)
As shown in the book and drawings, the electron gun in the cathode ray tube is inserted into the neck of the glass bulb, and while these are stationary, a ring burner placed around the neck of the glass bulb is fired in the circumferential direction. There is a so-called static type sealing device for a cathode m-tube, in which the neck portion and the stem portion of the electron gun are melt-sealed by a flame radiated from the inner circumferential surface of the ring burner.

This stationary LTJ mounting device consists of a bulb holder that holds a glass bulb, a mount depth that holds an electron gun at a prescribed position within the neck of the glass bulb, and a neck of the glass bulb, as shown in the above-mentioned $1 yen and drawings. It consists of a ring burner, etc. that repeats forward and reverse rocking motion at a predetermined rotation angle along the outer periphery of the burner.

Below is a detailed explanation of the conventional ring burner.
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 electric f-gun 11 in a cathode ray tube is inserted. A large number of openings 14 are arranged at regular intervals on the inner peripheral surface of the ring burner 13.

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 12a, and as shown in FIG. It is welded to the stem portion 11a of No. 11.

At this time, a large number of flames 15 emitted from the inner peripheral surface of the ring burner 13 collide perpendicularly with the outer peripheral 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, so that the flame 15 expands on the collision surface, so that the neck portion 12a is burnt widely. 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 strong oxidation development in the metal parts. As a result, the emission quality, which is an important characteristic of cathode ray tubes, deteriorates.

Further, when the neck portion 12a is burned by the ring burner 13, 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 cullet 1G.

The softened portion becomes thinner and the stem portion 11a k is welded. After this welding, the cullet 16 is cut. The welded portion between the neck portion 12a and the stem portion 11a is further baked to stabilize its shape so that good quality is maintained.

However, as described above, a large number of flames are emitted 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. There is also interference (collision), and the flame spreads significantly on the surface of the C1 neck portion, thereby softening the neck portion 12a over a wide range and increasing the thickness of the welded portion. This makes it difficult to tighten the JJlet 16, and the welded part is thick, so the neck part 1
The welding between the stem portion 2a and the stem portion 11a tends to be insufficient, and there is a risk that the welded portion may be damaged.

(Problems to be Solved by the Invention) As described above, in the conventional ring burner 13, the neck portion 1
Due to the flames 15 emitted from all 18 surfaces of the electron gun 2a so as to interfere with each other, the temperature of the neck part 12a rises abnormally and the IH temperature of the electron gun 11 also rises abnormally, causing the electron gun to become There is a problem of strong oxidation of component parts.

Furthermore, as mentioned above, the wall thickness of the welded part tends to become thick, making it difficult to cut the neck part 12a.
There is a problem that the welding state between the stem portion 11a and the stem portion 11a is not longer than 1 minute.

In order to solve the conventional problems in the melting of cathode ray tubes, the present invention divides the flame emission direction of the burner tip of a ring burner into multiple directions in which the flames do not interfere with each other. This aims to improve sealing quality and yield.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a ring burner disposed around the neck portion 12a relative to the neck portion 12a of the glass bulb 12 in which the electron gun 11 in the cathode ray tube is inserted. In a cathode ray tube sealing device that uses this ring burner to weld and seal the neck portion 12a and the stem portion 11a of the electron gun 11, the ring burner 21 is attached to a ring-shaped burner holder 22. A plurality of burner depths 23 are divided and provided at positions where a plurality of flame emission directions can be obtained while avoiding interference between flames.

(Function) In the present invention, the flame 36 emitted from the burner chip 23, which is divided into a plurality of directions so that the flame emission directions tATj do not interfere with each other, is caused by the rotation of the ring burner 21 to cause the flame 36 to radiate from the neck portion 12a. Since it moves along the outer circumferential surface, the circumferential surface of one neck portion 12a can be heated evenly, and the flame 36
excessive heating when they are radiated in such a way that they interfere with each other,
Flame expansion is prevented, thereby preventing an abnormal upper limit of the temperature inside the neck, and preventing oxidation of the electron gun parts due to thermal heating. In addition, since there is no flame expansion unlike in the conventional case, the welded portion of the neck portion 12a is locally softened, and the wall thickness of the welded portion is thinner, making it easier to cut and making it easier to weld the neck portion 12a with the stem portion 11a. will be ensured.

(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, the ring burner 21 has a ring-shaped burner holder 22 divided into two parts and a plurality of burner chips 23 provided thereon due to the sealing machine and barb attachment mechanism.

Each burner depth 23 is provided in divided positions at which a plurality of flame emission directions can be obtained in which interference between flames can be avoided. In FIG. 1, it is divided into four directions, but it may be divided into three directions. Also the first
The burner chips 23 shown in the figure constitute one group of three for each flame emission direction, and are configured so that a strong flame can be concentrated 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 []) supplied through the pipe 24 is supplied as shown in FIG. The gas is fed under pressure to a gas passage 25 formed inside the burner holder 22.

Further, 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 base 23a of the burner tip 23 is rotatably fitted to the shaft 2Ga of the bolt 26, and the bolt shaft 26a is screwed into the upper part of the barb holder 22. [Tighten and fix the barb depth base 23a.] Therefore, this bolt 26
The orientation of the burner tip 23 can be adjusted by loosening the .

The gas passage 25 in the burner holder 22 includes an axial through hole 31 bored in the shaft portion 26a of the bolt 2G, a radial through hole 32, and an inner peripheral surface of the burner tip base 23a. It communicates with the inner hole 34 of the burner tip 23 via the annular groove 33 . Since such a gas supply path is provided for each burner depth 23, the mixed gas supplied from the mixed gas supply pipe 24 to the gas passage 25 passes through the gas supply path to the opening at the tip of each burner depth 23. 35 and is ignited to form a flame 36 as shown in FIG.

Flames 36 are then emitted from each burner depth 23, which is grouped in three or four directions, aiming at 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 tip opening 35 of the burner tip 23 is the same as that of the flame 36.
determined by the length of Usually the diameter is 0.6~1
．． 2. Formed in a small hole in the steel.

Since the flame 3G is radiated in the tangential direction of the neck 112a or the stem portion 11a, compared to the case where the flame 3G is radiated from the front to the neck portion 128, the flame spreads in the tube axis direction etc. on the surface of the neck portion 12a (thermal radiation ) decreases, and the oxidation level of the metal parts of the electron gun 11 is reduced accordingly, thereby weakening the oxidation level.

In addition, since the burner depth 23 is set to be divided in a direction to avoid mutual interference of flames, there is a risk that the neck part 12a will be burnt widely and the welded part 1f will be thicker than in the conventional case. do not have. Therefore, cutting becomes easy, and the neck portion 12a and the stem portion 11a can be welded together with ease, the emission quality is stabilized, damage to the welded portion 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 depths divided at positions where a plurality of flame emission directions can be obtained while avoiding interference between flames. It is possible to prevent the risk of abnormal temperature rise due to flames interfering with each other inside, and the oxidation level of the electron gun can be significantly reduced, thereby stabilizing the emission quality, which is an important characteristic of cathode ray tubes. Gulp. In addition, only the part of the neck to be welded is heated intensively by the flame, which is prevented from spreading, and only the welded part becomes thin and softened, making it easier to cut the sawlet that is caused by heating and softening, and to improve the welded shape. It is stable, reduces the risk of damage due to poor shape or large distortion, and can contribute to improved yield.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a 1'4 mounting device for a cathode ray tube according to the present invention, FIG. 2 is a cross-sectional view thereof, FIG. FIG. 5 is a perspective view of a conventional sealing device, and a sectional view showing a 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, 128 φ/Neck part, 21... φ ring burner, 22... Burner holder, 23... Burner depth. Kaguri4enF45ggJ

Claims (4)

[Claims] (1) A ring burner installed around the neck of the glass bulb in the cathode ray tube is rotated relative to the neck of the glass bulb into which the electron gun is inserted. In a sealing device for a cathode ray tube in which a stem portion of the ring burner is welded and sealed, the ring burner has a plurality of burner chips attached to a ring-shaped burner holder, and a plurality of burner chips arranged in a plurality of flame emission directions to avoid interference between flames. 1. A sealing device for a cathode ray tube, characterized in that the sealing device is divided into parts and provided at positions where the following 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 radiation angle is oriented 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.