KR100228168B1 - Electron gun for cathode ray tube - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode structure of an electron gun for a color receiver tube that improves the electrode structure of a quadrupole lens used to improve the characteristics of an inline electron gun.

The present invention relates to a quadrupole electrode provided between the third grid 13 and the fourth grid 14, which are main lens parts, to improve focusing characteristics of R, G, and B electron beams passing through the through holes 16. By accommodating the through-hole H and having a U-shaped cross-section that is retracted in a predetermined width (w) and depth (d) in a direction parallel thereto, the quadrupole effect of the quadrupole electrode in the color tube electron gun is maintained. The manufacturing cost is effective to minimize.

Description

Kalashnikov gun

1 is an illustration showing the basic configuration of a color gun electron gun.

2 and 3 are grids for a conventional quadrupole lens configuration.

3 (a) is a front view.

Fig. 3 (b) is a longitudinal sectional view thereof.

4 is a grid for the configuration of the quadrupole lens of the present invention,

4 (a) is a front view.

4 (b) is a longitudinal cross-sectional view thereof.

* Explanation of symbols for main parts of the drawings

10: cathode 11: the first grid

12: second grid 13: third grid

14 fourth grid 15 anode

H: Through Hole B: Bead

S: Slit P: Plate

Q: 4-pole electrode w d: width depth

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color water tube electron gun, and more particularly, to an electrode structure of a color water tube electron gun which improves the electrode structure of a quadrupole lens used for improving the characteristics of an inline type electron gun.

In general, the color receiving tube (cathode ray tube) is a bulb type in which a fluorescent film is applied to the front screen and an electron gun is accommodated in the rear neck portion. R, G, and B electron beams emitted from the electron gun of the neck portion are spaced apart from the screen. And impinges on the fluorescent film through the micro holes of the shadow mask to be mounted to form pixels.

A schematic view of a color water tube electron gun using FIG. 1 shows a cathode assembly for emitting hot electrons from the cathode 10. First Grid (11) And a main lens portion composed of a third grid 13 and a fourth grid 14 for focusing the hot electrons emitted from the third pole into a predetermined electron beam. A stem glass assembly comprising a plurality of inner leads and electrode ribbons fixed to a stem glass (not shown) for supplying current and voltage to various grid assemblies including the assembly is provided. The first and second grids 11 and 12 of the three poles function as control electrodes and acceleration electrodes, respectively, and the third and fourth grids 13 and 14 of the main lens unit are screens of an electron beam. This function adjusts the focus on. An anode 15 to which a predetermined voltage (often kV) is applied is installed at the front of the plurality of grids.

On the other hand, in-line electron guns used in color receiving tubes have the advantages of simple structure because of R, G, B electron beams are arranged in a row, and spherical aberration of the focus lens that focuses the electron beam. ), The resolution decreases as the size of the pixel formed on the screen increases due to the spherical aberration caused by the electron beam focusing between the third grid 13 and the fourth grid 14 during the operation of the electron gun. do. At the same time, since the opening of the horizontal shape of the R, G, and B electron beams is used in the horizontal direction, astigmatism occurs because the horizontal electron beam focusing force is weaker than the vertical electron beam focusing force. . As the lens magnification increases due to the enlargement of the color receiving tube or the high voltage of the anode 15, spherical aberration becomes more severe and overfocus occurs, thereby deteriorating the focus characteristic.

At this time, various measures have been proposed to improve such deterioration of characteristics. For example, the quadrupole electrode Q (in the middle of the focus electrode divided into two parts of the third grid 13 and the fourth grid 14) 1) and an appropriate focusing constant voltage and focusing dynamic voltage are applied so that the electron beam is focused in an elongated shape. Since this is combined with the above-described electron beam horizontalization, the focus deterioration due to the distance difference between the screen center part and the periphery part or the resolution deterioration of the screen periphery part is compensated by the change of the focusing voltage, and the distortion of the electron beam due to the nonuniform deflection magnetic field Is compensated.

2 and 3 are grids for a conventional quadrupole lens configuration, and FIG. 3 (a) is a front view. Figure 3 (b) shows a longitudinal cross-sectional view.

In FIG. 2 (a), rectangular slits (S) and circular beads (B) are formed around the through holes (H) through which the R, G, and B electron beams pass. Referring to FIG. The slits S are recessed to a predetermined depth to have through holes H, and the beads B protrude to a predetermined width and height. This structure increases the die cost due to the relatively complicated complexity of dimensional control in the quadrupole electrode Q (see FIG. 1), which is a small part, and increases the cost of die processing because a press device with a relatively high pressure is used. Becomes

In FIG. 3 (a), plates P are installed at upper and lower sides of the through holes H through which the R, G, and B electron beams pass. Referring to FIG. 3 (b), the plate P is predetermined. It has a width and height of, and protrudes parallel to each other. Unlike the case of FIG. 2, such a structure does not increase the unit cost of mold processing, but in the quadrupole electrode Q (see FIG. 1), which is a small part, the joining process is difficult and the thermal effect thereof is caused. There is a disadvantage.

Accordingly, an object of the present invention is to provide a color water tube electron gun having a structure that can minimize the manufacturing cost while maintaining the 4-pole effect of the 4-pole electrode used to improve the deterioration of characteristics of the in-line type electron gun of the color water tube. It is.

In order to achieve the above object, the present invention provides a focusing characteristic of R, G, B electron beams installed between the third grid 13 and the fourth grid 14, which are main lens parts, and passed through three through holes H. In the electron gun for a color image tube including a quadrupole electrode (Q) to improve the power, the quadrupole electrode (Q) is a predetermined parallel to the axis connecting the through holes (H) in the through hole (H) portion Provided is a color water tube electron gun having a U-shaped cross-sectional shape that is retracted in width (w) and depth (d).

Hereinafter, with reference to the accompanying Figure 4 will be described in detail a preferred embodiment of the present invention.

In FIG. 4 (a), the quadrupole electrode Q of the present invention has the same point that the through-hole H through which the R, G, and B electron beams pass is formed on the same line. There is a difference in changing the structure with a predetermined width w in the direction parallel to it while receiving the ball H. The structural change is achieved by the quadrupole electrode Q having a bent portion having a c-shaped cross section which is retracted and bent to a predetermined depth d as shown in FIG. 4 (b).

As shown in FIG. 2, such a structure does not increase the mold processing cost of the quadrupole electrode Q, which is a small component, and as shown in FIG. 3, the manufacturing process is increased due to the difficulty of joining and the addition of subassembly operations. In addition, the disadvantages of thermal effects due to welding heat are excluded.

In addition, in fabricating and managing various quadrupole electrodes Q according to the type change of the color receiving tube, it is possible to easily change the predetermined width w and the depth d and bend-molded. Advantageous over the conventional embodiment described with reference to FIG. 3.

As described through the above embodiment, the present invention has the effect of minimizing the manufacturing cost while maintaining the quadrupole effect of the quadrupole electrode Q in the color water tube electron gun.

Although the present invention has been described above through its embodiments, the present invention is not limited thereto, and various modifications and applications may be made by those skilled in the art from the above-described embodiments and the appended claims.

Claims (1)

A color is provided between the third grid 13 and the fourth grid 14, which are main lens parts, and includes a four-pole electrode for improving focusing characteristics of R, G, and B electron beams passing through three through holes H. In the electron tube for a water tube, the quadrupole electrode has a U-shaped cross-sectional shape that is retracted by a predetermined width (w) and a depth (d) in parallel with the axis connecting the through holes (H) in the through holes (H). Color gun tube gun.