KR100228159B1 - Electron gun for color cathode ray tube - Google Patents

Abstract

The present invention relates to an electrode structure of an electron gun for a color receiver tube that improves the structure of some electrodes for improving the characteristics of an inline electron gun.

According to the present invention, at least one of the outer peripheral electrodes 13a and 14a formed on the opposing surfaces of the third grid 13 and the fourth grid 14 in the color water tube electron gun has its vertical plane cut in the form of a semicircle or an arc. Or by providing an electron gun for a color receiving tube characterized in that it has a protruding outer circumferential cut (S), to relax the electron beam focusing of the main lens portion and to enhance the quadrupole effect, spherical aberration, focus characteristics around the screen without changing the external dimensions of the water tube It is effective to improve the back.

Description

Kalashnikov gun

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

2 is a front view showing the structure of the electrode according to the present invention.

3 is a modified embodiment of FIG.

3 (a) is a perspective view,

FIG. 3 (b) is a cross sectional view of the center of FIG.

* 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

16 through-hole 23 focusing electrode

13a, 14a: outer electrode 13b, 14b: inner electrode

S, S ': outer periphery

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 that improves the structure of some electrodes for improving 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.

When the electron gun for the color water tube is outlined using FIG. 1, the three-pole part which consists of the cathode assembly, the 1st grid 11, and the 2nd grid 12 for emitting hot electrons from the cathode 10, and the said It includes a main lens unit composed of the third grid 13 and the fourth grid 14 to focus the hot electrons emitted from the triode to a predetermined electron beam, and supplies current and voltage to various grid assemblies including the cathode assembly. The stem glass assembly is composed of a plurality of inner lead and electrode ribbon fixed to the stem glass (not shown). 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. A plurality of anodes 15 to which a predetermined voltage (several tens kHz) is applied are 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, the astigmatism is generated because the electron beam focusing force in the horizontal direction is weaker than the electron beam focusing force in the vertical direction. . 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 methods have been proposed to improve such deterioration of characteristics. For example, in order to reduce spherical aberration, the focus lens may be increased by increasing the opening size of the electrodes 13a and 14a facing each other and increasing the size of the gap gap. It hardens | cures and alleviates the excessive connection of an electron. However, due to the structure of the neck part, this enlargement and increase in distance are limited to the lens aperture enlargement, and if the gap is too wide, the magnetic field of the electrostatic charge and deflection yoke permeating from the outer periphery of the neck part affects the focus lens, causing misconvergence of the electron beam. .

Accordingly, an object of the present invention is to provide a color water tube electron gun which improves the characteristic deterioration of the in-line type electron gun by weakening the lens focus of the main lens by appropriately improving the structure of the color water tube electron gun without changing the size or arrangement interval of the electrode. To provide.

In order to achieve this object, at least one of the outer circumferential electrodes 13a and 14a formed on opposing surfaces of the third grid 13 and the fourth grid 14 may have a semicircle or arc in its vertical plane. It provides an electron gun for a collar receiving tube, characterized in that it has an outer incision (S) to be cut into.

In this case, the outer circumferential cutout (S) may be formed in the same amount at the tip of the upper and lower horizontal planes of the outer circumferential electrodes 13a and 14a, instead of being formed on the vertical plane of the outer circumferential electrodes 13a and 14a. In addition, the outer periphery (S) may be formed where one of the two beams of the center or one of the R, G, B electron beam passes. In another embodiment, the focusing correction electrode 23 having the outer circumferential cutout S ′ formed in the direction of the opposite electrode may be further provided inside the outer circumferential electrodes 13a and 14a.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a front view showing the structure of the electrode according to the present invention.

The third grid 13 constituting the main lens unit is usually composed of an outer circumferential electrode 13a and an inner electrode 13b (see FIG. 1), wherein the former is bent to a predetermined length and a horizontal opening is formed. In the latter, three through holes 16 through which the R, G, and B electron beams pass are formed to extend backwards by a predetermined length by processing such as drawing.

At this time, as an embodiment according to the present invention to form an outer circumferential cut (S) that is cut in the form of a semi-circle or arc on the vertical surface in the outer circumferential electrode (13a) of the third grid 13, S) may be formed in each of the through holes 16 of each of the R, G, and B electron beams, or may be selectively formed at a position where a center beam or two beams on both sides of the R, G, and B electron beams pass. .

In addition, the present embodiment is configured to form the outer circumferential cutout (S) in the third grid 13, it is also possible to install only in the fourth grid 14 or all of them in combination.

In any case, since the outer circumferential cutout portion S is installed in the vertical direction, lens focusing of the electron beam is weakened, thereby reducing spherical aberration and improving focus characteristics.

FIG. 3 (a) shows a perspective view of a variant embodiment of FIG. 2, and FIG. 3 (b) shows a central cross section of FIG. 3 (a).

Referring to FIG. 3 (a), in the present embodiment, instead of forming the outer circumferential cutout portion S in the vertical plane of the outer circumferential electrodes 13a and 14a as shown in FIG. 2, the upper and lower sides of the outer circumferential electrodes 13a and 14a are not shown. It is formed at the tip of the horizontal plane. Even in this case, the outer circumferential cutout S may be selectively or collectively formed at a position where one beam in the center or two beams on both sides of the R, G, and B electron beams pass.

At this time, the focusing correction electrode 23 is additionally mounted inside the outer circumferential electrodes 13a and 14a at positions where the R, G, and B electron beams are divided into three. As described above, the thin plate-shaped focusing correction electrode 23 is a means for reducing astigmatism due to horizontal lateralization of the electrode in the in-line electron gun, rather than reducing spherical aberration by weakening the lens focus of the electron beam.

Referring to FIG. 3 (b), the focusing correction electrode 23 forms an outer circumferential cutout S ′ in a direction of an opposite electrode, that is, an outer circumferential cutout S ′ that is cut in a semicircle or arc shape. ) Is provided in the direction of the anode 15 (see FIG. 1) in the third grid 13 and in the direction of the cathode 10 (see FIG. 1) in the fourth grid 14. This arrangement reduces the spherical aberration by forming a common portion toward the main lens portion to mitigate the focusing of the electron beam.

Referring to FIG. 3 (c), the outer circumferential cutout S is formed at the tip of the upper and lower horizontal planes of the outer circumferential electrode 14a as shown in FIG. Even in this case, the outer circumference may be selectively or collectively formed at one of the R, G, and B electron beams through which the central one beam or the two beams on both sides pass. At this time, the focusing correction electrode 23 is additionally mounted inside the outer circumferential electrodes 13a and 14a at positions where the R, G, and B electron beams are divided into three. As described above, by protruding the vertical and horizontal planes of the outer circumferential electrode 14a in the cathode direction, the quadrupole effect for preventing focus deterioration of the corner portion of the large cathode ray tube can be enhanced.

As described through the above embodiments, the present invention forms an appropriate incision in the electrode constituting the main lens of the color water tube electron gun to alleviate the focusing of the electron beam, thereby improving spherical aberration and focus characteristics without changing the external dimensions of the water tube. It is effective to let.

Although the present invention has been described above through the 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 (4)

In the electron gun for color image tube which comprises the main lens part by the 3rd grid 13, the 4th grid 14, etc., and focuses R, G, B electron beams: The said 3rd grid 13 and the 4th grid 14 At least one of the outer circumferential electrodes 13a, 14a at the ends of the opposite sides of the outer circumferential cutout S, which is cut or protruded in the form of a predetermined arc around the vertical plane of the R, G, B electron beams on its horizontal plane, respectively. Color gun tube gun, characterized in that having a. The collar according to claim 1, wherein the outer circumferential cutout portion S is formed at the tip of left and right vertical surfaces of the outer circumferential electrodes 13a and 14a, instead of being formed on the horizontal plane of the outer circumferential electrodes 13a and 14a. Award tube gun. The electron gun for color image tubes according to claim 1 or 2, wherein a focusing correction electrode (23) is further provided inside each of the outer circumferential electrodes (13a) and (14a). . 4. A circular arc according to claim 3, wherein the focusing correction electrode 23 is a predetermined arc around the horizontal plane of the R, G, and B electron beams at the end portions of the third grid 13 and the fourth grid 14 opposite to each other. Color gun tube gun, characterized in that it has an outer circumcision (S ') is cut in the form of.