KR200342945Y1 - Stem for cathode ray tube and cathode ray tube having the same - Google Patents

Abstract

It is a stem of a cathode ray tube that prevents the occurrence of holes and makes the sealing shape more uniform when fused to the neck. The stem is equipped with a plurality of pins for applying current to each grid electrode of the electron gun and the electron gun. The formed flare is fused to the seal face of the neck end and is fixed to the neck. In particular, the stem has a stem height base of a certain height between the flare and the stem so that the inner circumferential surface of the neck end can be closely contacted with the stem at a constant height. Or a concave portion of a predetermined depth is formed at the edge of the flare portion facing the neck portion seal surface, or a protrusion is formed at a predetermined height toward the neck portion from the stem mount circumference.

Minimize the gap between the end of the neck and the stem by the stem base or concave or protrusion to prevent the occurrence of holes when encapsulating, and by matching the end of the neck with the stem to enable accurate fusion process, the shape of the stem By making it more uniform, the yield and productivity of a cathode ray tube are improved.

Description

Stem of cathode ray tube and cathode ray tube comprising same {Stem for cathode ray tube and cathode ray tube having the same}

The present invention relates to a stem of a cathode ray tube, and more particularly, to minimize the gap between the end of the neck portion and the stem to which the stem is sealed, to minimize the encapsulation defect of the stem by the gap, and to more uniform the sealing shape of the stem It relates to a stem of a cathode ray tube which can improve the yield and productivity of the cathode ray tube.

In general, a cathode ray tube is a display device that implements a predetermined image by scanning a three-beam electron beam emitted from an electron gun onto a fluorescent screen screen in which a plurality of green, blue, and red fluorescent films are patterned in a dot or stripe shape and emitting light.

Here, the electron gun is formed as an electron beam through the process of focusing and accelerating the hot electrons emitted from the cathode using a plurality of grid electrodes, the electron gun is formed on a stem equipped with a plurality of pins that provide current to these grid electrodes. It is mounted and located inside the neck.

7 is a view showing a method for sealing a stem according to the prior art, wherein the neck portion 3 facing the flare portion 5 of the stem 1 in a state where the stem 1 is located inside the neck portion 3. The outer circumferential surface of the substrate is heated by fusion with a torch 7 or the like, and the lower end of the remaining neck portion 3 is fused.

However, this technique generates fine glass powder as the lower end of the neck portion 3 is fused and cut or broken, and the glass powder enters into the cathode ray tube through the exhaust pipe 9 formed on the stem 5 and the like. It adversely affects the performance of cathode ray tubes, such as clogging holes, and causes material loss due to parts being disposed of.

Therefore, to overcome this drawback, as shown in FIG. 8, the diameter of the flare part 5 of the stem 1 is formed to be similar to the outer diameter of the neck part 3 so that the ends of the neck part 3 and the stem 1 may be formed. A technique for directly welding the flare portion 5 has been developed.

However, the above-described technique forms a predetermined curvature as shown in FIG. 9, rather than the cut surface of the neck portion 3, that is, the seal surface 8a to be fused with the stem 1, into a complete plane due to the nature of the glass material. Since there is a tendency to be cut, placing a neck portion (3) seal surface (3a) on the flare (5) for sealing with the stem (1) will generate a small gap (t).

By the gap, the flame of the torch causes a backfire when it is enclosed, and a hole is generated in the encapsulation surface. Through the above hole, the flame of the torch enters the neck part and oxidizes the cathode support and the pin of the electron gun to oxidize the electron gun. Lowers the reliability.

In addition, due to the main reason that the seal surface of the neck portion does not form a flat surface, a difference occurs in the length of the neck portion encapsulated for each cathode ray tube, resulting in a non-uniform sealing form of the stem for each cathode ray tube, causing sealing failure. Etc., lowers the yield and productivity of the cathode ray tube.

Therefore, the present invention is designed to solve the above problems, the object of the present invention is to minimize the gap between the end of the neck and the stem to which the stem is sealed to minimize the poor sealing of the stem by the gap, the form of the encapsulation of the stem It is to provide a stem of the cathode ray tube that can be more uniform to improve the yield and productivity of the cathode ray tube.

1 is a cross-sectional view of a cathode ray tube including a stem according to the present invention.

2 is a side view of the electron gun.

3, 5 and 6 are side views of a stem according to the first, second and third embodiments of the present invention.

Figure 4 is a side view showing a fusion method of the stem according to the present invention.

7 and 8 are side views showing a method for fusion of the stem according to the prior art.

9 is a cross-sectional view of the neck portion showing an enlarged end of the neck portion.

The present invention to achieve the above object,

A stem of a cathode ray tube mounted with a plurality of pins for applying an electric current to an electron gun and each grid electrode of the electron gun, wherein a flare portion having a maximum diameter is fused to the neck portion seal surface and fixed to the neck portion.

The stem provides a stem of the cathode ray tube, characterized in that the inner peripheral surface of the end of the neck portion and the stem is provided in close contact with a predetermined height on one surface of the flare portion facing the neck portion.

The means consists of a stem base formed at a predetermined height and a diameter smaller than the inner diameter of the end of the neck portion between the flare portion and the stem, or a step at a predetermined depth at the edge of the flare portion facing the neck portion seal surface. It may be made of a concave portion, it may also be made of a protrusion formed protruding to a predetermined height in a plurality of stem mountain periphery.

By the stem base, the concave portion, or the protruding portion, the end of the neck portion is stably fixed to the stem while minimizing the occurrence of a gap, so that even when the flatness of the neck portion seal surface is not constant, fusion with the stem occurs. Suppression has the advantage of preventing the sealing failure.

Hereinafter, with reference to the accompanying drawings illustrating a preferred embodiment of the present invention in more detail.

1 is a cross-sectional view of a cathode ray tube including a stem according to the present invention. As shown in the drawing, the cathode ray tube includes a panel 4 that forms a fluorescent film screen 2 on its inner surface, a neck portion 8 that mounts an electron gun 6 on its inner circumferential surface, and a panel 4 and a neck portion ( 8) and the funnel 12 to which the deflection yoke 10 is mounted on the outer circumferential surface is integrally coupled.

The fluorescent film screen 2 includes a plurality of green, blue, and red fluorescent films patterned in a dot or stripe shape, and has three lines of electron beams whose current density is controlled in the electron gun 6 to emit the fluorescent films. 14, these electron beams 14 are deflected by the magnetic field from which the deflection yoke 10 is generated, thereby realizing a predetermined image by drawing a raster on the fluorescent film screen 2.

FIG. 2 is a side view of a general electron gun, wherein the electron gun 6 includes a cathode 16 that emits hot electrons, a plurality of grid electrodes 18 formed of electron beams by focusing and accelerating the hot electrons, and these grid electrodes And a pair of bead glasses 20 for integrally fixing 18, and a plurality of pins 22 for applying current to these grid electrodes 18.

The pins 22 are connected to both ends of each of the grid electrodes 18 and an external power supply circuit (not shown) so that the cathode 16 is transferred to each grid electrode 18 by transferring current applied to the external power supply circuit. Focus and accelerate the hot electrons emitted by the

The pins 22 are inserted into and fixed to the stem 24 at the center thereof. Thus, the plurality of pins 22 are mounted together with the electron gun 6, and the pins 22 are fused to the seal surface of the neck part 8. A member for fixing 6) to the inside of the neck 8 is called a stem 24.

3 is a side view of the stem 24 according to the first embodiment of the present invention, wherein the stem 24 has a flare portion 26 facing the seal surface 8a at the end of the neck portion 8 and the pin ( 22 includes a plurality of stem mounts 28 extending in the direction of the electron gun to securely hold them, and after sealing the stem 24 at the center of the flare portion 26, the stem 24 is connected to an exhaust device to exhaust the inside of the bulb. Exhaust pipe 30 is provided.

The flare portion 26 of the stem 24 is formed with a diameter larger than the outer diameter of the end of the neck portion 8 and is inserted into the seal portion 8a of the neck portion 8 without being inserted into the neck portion 8. A direct fusion structure is achieved.

In particular, the stem 24 according to the present embodiment has a predetermined height from below the stem mount 28 toward the neck portion 8 so as to be in close contact with the inner circumferential surface of the end of the neck portion 8 at the top of the flare portion 26. The stem acid base 32 is formed.

The diameter of the stem base 32 is formed to be the same as or slightly smaller than the inner diameter of the end of the neck portion 8 so that the end of the neck portion 8 sufficiently surrounds the stem base 32, the neck portion (8) The diameter and height of the stem base 32 may be adjusted so that the end of the neck portion 8 may be stably positioned at the outside of the stem base 32 while preventing a gap between the inner circumferential surface of the tip and the stem base 32. Set it appropriately.

When the stem 24 having the stem mount base 32 formed in this way is positioned at the end of the neck portion 8, the end of the neck portion 8 has a gap with the stem mount base 32 outside the stem mount base 32. It is fixed while minimizing, and the seal surface 8a of the neck portion 8 faces the edge surface of the flare portion 26.

In the state where the end of the neck portion 8 surrounds the stem mount base 32, as shown in FIG. 4, the flare portion 26 of the stem 24 is heated using a heating means such as a torch 34. Heating is carried out in a conventional manner until the ends of the neck portion 8 are melted. Through this heating, the stem 24 is fused to the neck portion 8, and they are integrally fixed while forming a smooth curved surface as shown in FIG.

5 is a side view of the stem according to the second embodiment of the present invention, hereinafter, the same reference numerals are used for the same components. As shown, the stem 24 according to the present embodiment has a predetermined step with the flare center portion 26a at the edge of the flare portion 26 facing the seal surface 8a of the neck portion 8. The recessed part 26b of constant depth is formed.

The central portion 26a of the flared portion whose outer diameter is reduced by the concave portion 26b is formed to have a diameter the same as or slightly smaller than the inner diameter of the end of the neck portion 8, and there is a gap between the end of the neck portion 8 and the end portion thereof. While minimizing the occurrence of the neck portion (8) end so as to fully surround the flare center portion (26a).

At this time, the step d between the flare center portion 26a and the recess 26b is sufficiently higher than the planar error range of the seal portion 8a of the neck portion 8 so that the neck portion 8 and the stem 24 are formed. Minimize the gap between).

When the stem 24 with the step formed by the recessed portion 26b is positioned in the neck portion 8 in this manner, the end of the neck portion 8 is located outside the center portion 26a of the flange portion, and the neck portion 8 Seal face 8a faces the surface of recess 26b.

In such a state, the stem 24 is fixed to the neck portion 8 by fusing them by using a heating means such as a torch.

Finally, Figure 6 is a side view of the stem according to the third embodiment of the present invention, the stem 24 according to the present embodiment is located around the stem acid 28 to surround the plurality of stem acid 28 A protrusion 34 is formed to protrude toward the neck 8 at a predetermined height.

The outer diameter of the protrusion 34 is the same as or slightly smaller than the inner diameter of the end of the neck portion 8, the same as in the previous embodiment, while minimizing the occurrence of gaps between the neck and the end of the neck portion (8) 8) The end wraps enough of the protrusion (34).

This embodiment of such a configuration is also fused to the neck portion 8 in the same manner as the previous embodiment is fixed integrally.

As described above, the stem base 32, the recess 26b, or the protrusion 34 are formed on the stem 24, and the stem according to the present invention has the following advantages.

First, since the end of the neck portion 8 and the stem 24 are fused at a fixed height, the gap between the neck portion 8 and the stem 24 is minimized to suppress the occurrence of holes that may occur during sealing. can do. Therefore, when a hole is generated, the flame of the torch enters the neck portion 8 to overcome the problem of lowering the reliability of the electron gun 6 by oxidizing the cathode support and the pin of the electron gun 6.

Second, since the stem 24 can be stably fixed to the end of the neck 8, the end of the neck 8 and the stem 24 can be exactly matched at the desired sealing position. As a result, the stem 24 and the neck portion 8 exactly match the operation error of the fixing means for fixing the funnel, so that a more accurate welding process can be performed.

Third, since the stem 24 is fused in a state where the end of the neck portion 8 covers a part of the stem 24, sealing failure such as a sudden decrease in thickness at the junction with the end of the neck portion 8 is conventional. The neck portion 8 and the stem 24 can be fused more uniformly and smoothly.

In addition, since the stem 24 can adjust the length of the neck portion 8 by slightly adjusting its position upward or downward with reference to the drawing in the process of fusion with the neck portion 8, The difference in length of the neck portion 8 to be sealed can be corrected.

As described above, the stem according to the present embodiment has an advantage of preventing the sealing failure, maintaining the sealing form with the neck portion more uniformly, and minimizing the difference in the length of the neck portion.

In the above description of the preferred embodiment of the present invention, the present invention is not limited to this, but can be carried out in various ways within the scope of the utility model registration claim and the detailed description of the invention and the scope of the accompanying drawings. Naturally, it belongs to the scope of the present invention.

As described above, the stem according to the present invention enables a precise fusion process by closely contacting a part of the neck end portion with the stem, and minimizes the gap between the neck part and the stem, even though the flatness of the neck part seal surface is not constant, thereby causing the encapsulation step. It is possible to prevent the deterioration of the reliability of the electron gun which can be caused by. In addition, it is possible to improve the yield and productivity of the cathode ray tube by making the sealing form between the stem and the neck portion more uniform.

Claims (8)

In the stem of the cathode ray tube mounted on the electron gun and a plurality of pins for applying a current to each grid electrode of the electron gun, the flare portion formed to the maximum diameter is fused to the neck portion seal surface fixed to the neck portion, The stem is a stem of the cathode ray tube, characterized in that to provide a means for the inner circumferential surface of the end of the neck portion and the stem in close contact with a predetermined height on one surface of the flare portion facing the neck portion. The stem of claim 1, wherein the means has a diameter smaller than the inner diameter of the end portion of the neck portion and a predetermined height, and is formed of a stem acid base having a plurality of stem acids formed on the surface thereof. 2. The stem of a cathode ray tube according to claim 1, wherein said means comprises a concave portion that forms a step at a predetermined depth at an edge of the flare portion facing the seal surface of the neck portion. The stem of claim 1, wherein the means is formed to protrude to a predetermined height from a plurality of stems around the stem, the outer diameter is formed of a projection formed smaller than the inner diameter of the end of the neck portion. A panel for forming a fluorescent film screen on the inner surface, a neck portion for mounting the electron gun on the inner circumferential surface, a funnel for connecting the panel and the neck portion, and an electron gun mounted and sealed to the neck portion to fix the electron gun inside the neck portion. In the cathode ray tube comprising: The stem is flared and fused to the neck seal surface; A stem mount which fixes a plurality of pins connecting each grid electrode of the electron gun and an external circuit; The cathode ray tube, characterized in that provided on one side of the flare facing the neck portion, the inner circumferential surface of the stem and the end of the neck portion is arranged in close contact with a predetermined height. The cathode ray tube according to claim 5, wherein the means is formed of a stem acid base having a diameter smaller than the inner diameter of the end of the neck portion and a predetermined height, and having a plurality of stem acids formed on the surface thereof. 6. The cathode ray tube according to claim 5, wherein said means comprises a concave portion forming a step at a predetermined depth at the edge of the flare portion facing the seal surface of the neck portion. 6. The cathode ray tube according to claim 5, wherein the means is formed to protrude at a predetermined height from a plurality of stem mounts and has an outer diameter smaller than an inner diameter of the end of the neck portion.