KR880003372Y1 - An electron gun for color picture tube - Google Patents

Abstract

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Description

Electron gun of color tube receiver

1 is a longitudinal sectional view showing the general structure of the water pipe.

FIG. 2 (a) and FIG. 2 (b) are plan and cross-sectional side views of the electron gun provided with the present invention.

3 is a front view of the main focusing lens to which the present invention is mounted.

4 is a front view of a conventional main focusing lens.

5 (a) and 5 (b) are electric field and equipotential distribution diagrams between the counter electrodes according to the present invention forming a main focusing lens.

6 (a) and 6 (b) are electric fields and distribution diagrams between conventional counter electrodes forming a main focusing lens.

7 is a beam spot shape of the electron gun of the present invention.

8 is a beam spot shape diagram of a conventional electron gun.

* Explanation of symbols for main parts of the drawings

11: metal plate

The present invention relates to an electron gun of a water tube for color television. In particular, a 0.1-0.5 mm thick alloy plate of iron and nickel is mounted around the red and blue electron beam passing holes of the electrode, which is the main focusing lens part installed inside the electron gun, or the same thickness is formed on the electrode itself to pass the red and blue electron beams. By increasing the inclination and density of the electric field distribution in the outer side of the ball (vertical direction), the center side of the equipotential distribution is slightly shifted to the outer side, so that the red and blue electron beams converge in the direction of the green beam. Three beams of red, green, and blue are connected to one point, so the self-converging of the water pipe is good, and the shape of the beam spot is improved without distortion. It was intended to be.

In general, the water tube 20 of the color TV has an electron gun 1, a shadow mask 22, a panel 23 and a panel 24 on which phosphors are applied, as shown in FIG. In-line electron gun (1) is composed of a cathode (2), the first, second, third and fourth electrodes (6) which emit red, green and blue electron beams as shown in FIG. (7) (8) (9) or more electrodes are arranged in a line and fixed to the rod-shaped electrical insulator 10, and each of the electrodes 6, 7, 8 and 9 has three electron beam through holes. (3) (4) (5) are formed, and the three primary electron beams 21 emitted from the respective cathodes 2 are the electron beams of the electrodes 6, 7, 8, and 9 described above. While passing through the through holes (3) (4) (5) is focused on the main lens to form a beam spot on the inner surface of the panel 23 of the water pipe (20).

Therefore, in the conventional electron gun, the shape of the beam spot is distorted due to the electric field distribution being distorted due to the interference of each electric field distribution of red, green, and blue and the interference between each electron beam 21 in the main focusing electrode 9. As shown in FIG.

Here, the "X" direction is the direction in which the electron gun is arranged.

Therefore, the beam spot shape as described above becomes larger as the beam current increases and worsens the focus characteristic at the center of the screen, and also the warp of both beam spots is deflected by the deflection yoke at the periphery of the screen. This becomes stronger and aberrations occur from side to side, resulting in a deterioration in focusing.

Therefore, the present invention was devised to solve the conventional drawback, and the electron gun of the present invention is an alloy plate of 0.1-0.5mm of iron and nickel around the red and blue electron beam passing holes of the electrode corresponding to the main focusing lens part. Metal plate material is installed or the same thickness as the metal plate material is formed by the main focusing lens itself, so that the side electron beam (red, blue) passing through the main focusing lens is focused to the center side to improve self-converging and the electric field to the outside. By increasing the distribution, the shape of the beam spot is improved so as not to be distorted, thereby improving the quality of the screen.

This will be described in detail with reference to the accompanying drawings.

First, second, third and fourth electrodes 6 and 7 each having a cathode 2 and three, three, four, five through-holes of red, green and blue in the inline electron gun 1 (8) A third and fourth electrode (8), which is an electrode for forming a main focusing lens, in the known water tube for color TV, which is arranged in a row and fixed to a rod-shaped electric insulated light (10). 9) A metal plate mainly composed of nickel and iron having a thickness of 0.1-0.5 mm in the outer circumferential portion of each of the red, blue, and electron beam through holes 3 and 5 of the fourth electrode 9 to which high pressure is applied. 11) or a portion where the metal plate 11 is mounted is thickened with the fourth electrode 9 itself.

According to the present invention, a metal sheet having a thickness of 0.1-0.5 mm is formed by using nickel and iron as main components on the outer circumferential portions of each of the red and blue electron beam passing holes 3 and 5 of the fourth electrode 9. The thickness of the field distribution of the outside of the red and blue electron beam passing holes (3) (5) is greatly increased by making the portion where the metal plate 11 is to be mounted is about 0.1-0.5 mm thicker than the inner side. The side was slightly biased toward the outer side (Y side direction).

Therefore, as shown in FIG. 6, since the equipotential inclination is increased toward the outer side and the center side is biased, the red, blue, and electron beams passing therethrough are focused in the direction of the green beam (the central axis of the electron gun). The three beams of green and blue are focused at one point to improve the self-converging of the water pipe, and the distribution of electric field and equipotential lines in the outward direction (Y-direction) becomes stronger. It will not be crushed and will improve the focus of the screen.

Then, the electric field and the equipotential distribution between the third and fourth lenses (opposing lenses) 8 and 9 forming the main focusing lens of the electron gun according to the present invention of FIGS. 5 (a) and 5 (b) are shown. 6 (a) and 6 (b) show the distribution of electrodes and equipotentials between the third and fourth lenses forming the main focusing lens by the conventional electron gun.

As such, the present invention improves the quality of the screen by forming an arbitrary thickness portion in the main focusing lens or by attaching a metal plate to improve the converging and prevent the distortion of the beam spot shape. It can be improved.

Claims (2)

First, second, third and fourth electrodes 6 and 7 having a cathode 2 and three, three, through-holes 3, 4 and 5 of the red, green and blue holes formed in the inline electron gun 1, respectively. (8) A third and fourth electrode (8) (9), which is an electrode for forming a main focusing lens, in the known water tube for color TV, in which (9) is arranged in a row and fixed to a rod-shaped electrical insulator (10). Is a metal plate material mainly composed of nickel and iron having a thickness of 0.1-0.5 mm in the outer circumferential portion of each of the red and blue electron beam through holes (3) (5) of the fourth electrode (9). The electron gun of the award-winning tube for color TV characterized by attaching). The color TV according to claim 1, wherein a thickness of 0.1-0.5 mm is formed in the outer circumferential portion of each of the red and blue electron beam passing holes (3) (5) of the fourth electrode (9). Dragon Award Gun.