KR200363106Y1 - 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 flare formed is fused to the seal face of the neck end and fixed to the neck. In particular, the stem forms a fixed end projecting at a predetermined height from the edge of the flare toward the neck so as to surround the outer peripheral surface of the neck end.

This fixed end minimizes the gap between the neck and the stem even if the seal surface of the neck does not form a perfect flat surface, thereby suppressing the occurrence of holes during sealing, and matching the end of the neck with the stem to enable accurate welding process. This improves the yield and productivity of cathode ray tubes by making the sealing form of the stem more uniform.

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 suppress the occurrence of cracks due to the encapsulation defect And it relates to a stem of the cathode ray tube that can improve the yield and productivity of the cathode ray tube by making the sealing form of the stem more uniform.

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.

FIG. 6 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. 7, the diameter of the flare portion 5 of the stem 1 is formed to be similar to the outer diameter of the neck portion 3 so that the ends of the neck portion 3 and the stem 1 are separated. 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. 8, rather than the cut surface of the neck portion 3, that is, the seal surface 8a to be fused with the stem 1, to 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, so that the sealing form of the stem is not uniform for each cathode ray tube, and cracks are caused by poor sealing. To reduce 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 stem is sealed stem to minimize the sealing defect of the stem by the gap, due to the poor sealing It is to provide a stem of the cathode ray tube that can suppress the occurrence of cracks, and to improve the yield and productivity of the cathode ray tube by making the sealing form of the stem more uniform.

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 and 5 are side views of the stem according to the present invention.

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

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

Figure 8 is a cross-sectional view of the neck portion showing an enlarged neck end.

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 to form a fixed end protruding from the flare portion edge toward the neck portion to surround the outer peripheral surface of the neck end portion.

At this time, since the inner diameter of the fixed end is formed larger than the outer diameter of the end of the neck portion, when the stem is enclosed in the neck portion, the end of the neck portion is stably fixed to the flare portion while minimizing the occurrence of gaps by the fixed end.

As a result, even if the flatness of the neck portion seal surface is not constant, there is an advantage that the fusion process can be performed more precisely while suppressing the generation of holes by heat fusion between the fixed end and the neck end.

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 the panel 4 and the neck portion described above. The funnel 12 to which the deflection yoke 10 is mounted on the outer circumferential surface is connected integrally.

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

These pins 22 are fixed to the center portion of the stem 24. Thus, a plurality of pins 22 are mounted together with the electron gun 6, and are fused to the seal surface of the neck portion 8 so that the electron gun ( A member for fixing 6) to the inside of the neck 8 is called a stem 24.

Figure 3 is a side view of the stem 24 according to the present invention, the stem 24 is a flare portion 26 facing the seal surface 8a at the end of the neck portion 8, and the pins 22 are fixed firmly And a plurality of stem mounts 28 extending in the direction of the electron gun, and in the center of the flare portion 26, after the stem 24 is sealed, the exhaust pipe 30 is connected to the exhaust device to exhaust the inside of the bulb. Is installed.

The flare portion 26 of the stem 24 is formed with a diameter larger than the outer diameter of the seal portion 8a of the neck portion 8 and is not inserted into the neck portion 8, so that the seal surface of the neck portion 8 is closed. It forms a structure which is fused directly to (8a).

In particular, the stem 24 according to the present embodiment has the neck portion 8 at the edge of the flare portion 26 to surround the outer circumferential surface of the end portion 8a of the neck portion 8 at the upper portion of the flare portion 26. The fixed end 32 is formed to protrude toward the predetermined height.

The inner diameter of the fixed end 32 is formed to be larger than the outer diameter of the end of the neck portion 8 so as to surround the end of the neck portion 8 sufficiently, and the seal surface 8a and the neck portion 8 of which the plan view is not constant. The height of the fixed end 32 is approximately 0.5 to 1 mm so that the end of the neck portion 8 can be stably positioned inside the fixed end 32 while preventing a gap between the fixed ends 32. It is preferable.

When the stem 24 having the fixed end 32 formed thereon is positioned at the end of the neck portion 8, the end of the neck portion 8 is stably fixed inside the fixed end 32 and the outside of the stem mount 28. The seal surface 8a of the neck portion 8 faces the upper portion of the flare portion 26.

In the state where the end of the neck portion 8 is wrapped with the fixed end 32, as shown in FIG. 4, the fixed end 32 and the neck of the stem 24 are heated using a heating means such as a torch 34. Heating is carried out in a conventional manner until the end of section 8 is 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.

As such, the stem 24 according to the present embodiment has the following advantages by forming the fixed end 32 surrounding the end of the neck portion 8 on the stem 24.

First, it is possible to minimize the gap between the end of the neck portion 8 and the flare portion 26 to suppress the generation of holes that may occur during sealing. Therefore, when a hole is generated, the flame of the torch 34 enters the neck portion 8 to overcome the problem of lowering the reliability of the electron gun by oxidizing the cathode support and the pin of the electron gun.

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 is wrapped with the fixed end 32, sealing defects such as a sudden decrease in thickness at the junction with the end of the neck portion 8 are conventionally eliminated. 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 upwards or downwards based on 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 more uniformly maintaining the sealed form with the neck portion, preventing the occurrence of cracks due to the poor sealing, and minimizing the difference in the length of the neck portion.

Meanwhile, the neck portion 8 to be fused with the stem 24 may have a configuration in which the outer diameter becomes narrower toward the end where the stem 24 is fused while forming the same inner diameter as shown in FIG. 3. As shown in FIG. 5, the inner diameter and the outer diameter are both narrowed toward the end where the stem 24 is fused while being made to have the same thickness as a whole.

The stem 24 according to the present embodiment is fusion-fixed to the neck portion through the same process as described above not only in the case of the neck portion 8 shown in FIG. 5 but also in the case of the neck portion having another shape.

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.

In this way, the stem according to the present invention enables an accurate fusion process by matching the neck end and the stem by a fixed end, and minimizes the gap between the neck part and the stem even if the cut surface of the neck part, that is, the flatness of the seal surface, is not constant. This makes it possible to suppress the generation of holes during sealing. This prevents deterioration of the reliability of the electron gun which may be caused in the encapsulation step, and the encapsulation form with the neck portion becomes more uniform, thereby effectively improving the yield and productivity of the cathode ray tube.

Claims (4)

In the stem of the cathode ray tube which is equipped with pins for applying current to each grid electrode provided in the electron gun together with the electron gun, the flare portion is fused to the neck portion seal surface and fixed to the neck portion, The stem is a stem of the cathode ray tube, characterized in that for forming a fixed end projecting toward the neck portion from the flare edge to contact and wrap around the outer peripheral surface of the neck end. The stem of a cathode ray tube according to claim 1, wherein an inner diameter of the fixed end is larger than an outer 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 includes a flare portion fused to the neck portion seal surface; Cathode ray tube characterized in that it comprises a fixed end that protrudes from the edge of the flare portion toward the neck portion and wraps it in contact with the outer peripheral surface of the end of the neck portion. The cathode ray tube according to claim 3, wherein an inner diameter of the fixed end formed on the stem is larger than an outer diameter of the end of the neck portion.