KR200147994Y1 - Electrode of inline type electron gun - Google Patents

Abstract

The present invention discloses an improved electrode of an in-line color electron gun.

If the three-electron beam passing holes are configured in the same manner to form a four-pole lens, the intensity of the outer side is weakened, so that uniform beam spot correction is impossible.

In the present invention, the height of the opening of the outer electron beam passing hole increases toward the outside, thereby reinforcing the lens strength of the outside to obtain a uniform beam spot.

Description

Inline Electron Gun Electrode

1 is a plan view of a fluorescent surface showing a beam spot shape of an inline type electron gun;

2 is a perspective view illustrating the operation of an adjacent electrode for forming a quadrupole lens.

3A to 3C are front views showing configurations of a conventional electron beam through hole for forming a four-pole lens.

4 is a cross-sectional view showing a state in which three electron beams are deformed by a quadrupole lens.

5 and 6 are plan views of the electrodes according to the present invention.

* Explanation of symbols used in the main part of the drawing

G: electrode A1: (center) electron beam through hole

A2: (outside) electron beam passing hole O1, O1 ': opening (of central electron beam passing hole)

O2, O2 ': opening (of outer electron beam passing hole)

The present invention relates to an electrode of an in-line type CRT, and more particularly to an electrode forming a quadrupole lens.

The present invention relates to an electrode constituting an electron gun of a CRT, and more particularly to an electrode suitable for use in an in-line type color electron gun.

The CRT is a device for selectively emitting a fluorescent surface by deflecting an electron beam emitted from an electron gun. Since the fluorescent surface does not form a perfect sphere from the electron beam emission center, the beam spot outside the fluorescent surface becomes larger than the center side.

However, in the inline type color electron gun, since three guns of R, G, and B are arranged side by side, the distance of the fluorescent surface from the outer gun, that is, the R and B guns, is greatly different from the left and right sides of the fluorescent surface. When deflected, the projection of the fluorescent surface of the outer gun causes a crushed, trapezoidal mis-convergence.

Accordingly, a self-convergence yoke (SCY) deflection yoke, which provides a non-uniform magnetic field, is used. This SCY provides a pin-cushion-type horizontal magnetic field and a barrel-type vertical magnetic field to project the image of the outer gun. Will be corrected to square.

However, when looking at the beam spot B on the fluorescent surface S, as shown in FIG. 1, a halo (H) is formed to be diffused in a diagonal direction around a core C, which is flat from side to side, as shown in FIG. Appears in a distorted form with

Here, the flat core (C) is mainly due to the SCY over-focusing the outer beam in the vertical direction than the central beam, halo (H) is a boiling point (non-point that the electron beam is distorted by the non-uniform magnetic field of SCY) Iv) a combination of aberrations, spherical aberrations in which the fluorescent surface is aspherical, and spherical aberrations in which the magnification of the electron lens is too large for the aperture or the intensity of the external lens is weakened by end effects, etc. Is caused by.

As a method of correcting the distortion of the beam spot B, a method of correcting the correction magnet in the deflection yoke of the SCY method, a method of changing the size and shape of the electron beam through hole of the outer gun, and landing of the fluorescent surface Dynamic focusing method that adjusts the focal length according to the position, electrostatic lens formed between electrodes such as quadrupole or quadrupole lens, and gives a negative astigmatism to the electron beam in advance to close the electron beam. Various methods are used, such as a long form correction method.

FIG. 2 shows a method of forming a quadrupole lens as an example of the beam spot correction method. For example, the elongated electron beam through hole A is formed in one electrode G on the high-pressure side, and the low-pressure side adjacent thereto. By forming the transverse electron beam passing holes A 'on the other electrodes G', the cross section of the electron beam E passing through the electron beam E is formed in the vertical shape.

FIG. 3 shows various types of electron beam through holes forming such a quadrupole lens. First, (a) shows longitudinal and horizontal electron beam through holes A and A 'as shown in FIG. Is a combination.

On the other hand, (b) is a key hole-type electron beam through hole (A) in which the openings 10 are formed on the left and right sides up and down to compensate for the deterioration of the assembly of (a), and (c) An electron beam through hole A in which a slit S is formed above and below according to an earlier patent application No. 95-30839.

However, all of these conventional configurations can be said to be passive methods of controlling the electron beam by forming an opening outside the electron beam through hole A to locally weaken the electric field. Accordingly, the control effect such as the strength of the quadrupole lens is low, there is a problem that a sufficient degree of compensation is impossible.

In particular, there is a problem that the strength of the four-pole lens is weakened toward the outside, Figure 4 shows the shape of the electron beam (E1, E2) lengthened in the three quadrupole lens. In this case, the central electron beam E1 is uniformly lengthened, but the upper and lower edges of the outer electron beam E2 are dead. Accordingly, a small bump hangs on the outside of the beam spot B of the outer gun corrected by the quadrupole lens and is distorted into a crushed western ship shape, thereby preventing sufficient compensation.

Accordingly, it is an object of the present invention to provide an electrode that can obtain a good beam spot by reinforcing a quadrupole lens at the outer tendon edge.

In order to achieve the above object, the electrode according to the present invention is characterized in that, in an electrode in which three electron load passing holes are arranged laterally and the openings are formed to extend up and down, the height of the opening of the outer electron beam passing hole gradually increases toward the outside. It is done.

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

In FIG. 5, rectangular openings O1 and O2 extend vertically in the three electron beam through holes A1 and A2 of the inline electrode G to form a keyhole shape.

Here, the opening O2 of the outer electron beam passing hole A2 is gradually increased toward the outside to form a trapezoidal opening O2.

Meanwhile, in the embodiment of FIG. 6, the openings O1 ′ and O2 ′ are formed in a triangle, and the openings O2 ′ of the outer electron beam through hole A2 are formed in a right triangle shape with the outer end height.

Accordingly, the quadrupole lens forming effect gradually increases toward the outside, and thus the beam spot B having a uniform shape can be obtained by solving the conventional problem as shown in FIG.

Therefore, the present invention has an effect of improving the image quality of the inline type color cathode ray tube.

Claims (3)

An electrode of an inline type color electron gun in which openings extend above and below three electron beam through holes arranged in a horizontal direction, wherein the heights of the openings O2 and O2 ′ of the outer electron beam through holes A2 increase toward the outside. Inline electron gun electrode. The electrode of an inline electron gun according to claim 1, wherein the openings (O1, O2) are rectangular and the openings (O2) of the outer electron beam through hole (A2) form a trapezoid. The electrode of an inline electron gun according to claim 1, wherein the openings (O1 ', O2') are triangular and the openings (O2 ') of the outer electron beam through hole (A2) form a right triangle.