KR20000009401A - Dynamic quadruple electrode structure of electron gun for color cathode-ray tube - Google Patents

Abstract

PURPOSE: A dynamic quadruple electrode structure of an electron gun is provided to compensate a displacement error by deflection magnetic field from a deflection yoke. CONSTITUTION: In the dynamic quadruple electrode structure, a focus base voltage(VG3) is applied to a first electrodes(11) of plural grids, and a dynamic voltage(Vd) of parabolic waveform is applied to a second electrodes(12) of plural grids which are faced with the first electrodes(11), so that a dynamic quadruple lens portion(QL) is formed. Here, magnetic force to Red and Blue electron beams(R, B) is greater than that to Green electron beam(G) within the dynamic quadruple lens portion(QL). Thereby, the displacement error by deflection magnetic field can be compensated.

Description

Dynamic quadrupole electrode structure of electron gun for color cathode ray tube

The present invention relates to a dynamic quadrupole electrode structure of an electron gun for a color cathode ray tube, and more particularly, between a central electron beam and an ambient electron beam in passing a dynamic quadrupole lens portion between an electron beam at the center of the screen and an electron beam at the periphery of the screen. The present invention relates to a dynamic quadrupole electrode structure of an electron gun for a color cathode ray tube having a simple structure capable of canceling a difference due to a deflection magnetic field of a deflection yoke by changing the quadrupole action of the dynamic quadrupole lens portion.

As CRT screens become larger and smaller, the biggest problem is the resolution around the screen. The most important factor that determines the resolution of the periphery is the size and shape of the electron beam. The size of the electron beam is the ratio of magnification when the transition distance of the electron beam becomes longer.

M = Q / P × (Vf / Va) ^1/2

This increases the size of the electron beam.

In addition, another element that degrades the characteristics of the electron beam is that the electron beam is deflected to the periphery of the screen by the magnetic field of the self-convergence as shown in Figs. 10 and 11, the horizontal portion of the electron beam deflected by these magnetic fields Bh is focused on the screen, but since the electron beam of the vertical portion Bv is focused before the screen, a difference in focusing voltage between the horizontal portion Bh and the vertical portion Bv occurs at the periphery of the screen. do.

As shown in FIG. 12, unlike the electron beam G at the center of the screen, the electron beam Bp at the periphery of the screen is overfocused because the focus is made before the screen, and thus the halo part H is generated. Since the size of the electron beam is increased, it becomes difficult to obtain a distinct electron beam shape. As such a factor, the electron beam Bp at the periphery of the screen appears in a form including a halo component as shown in FIG. 2.

To solve this problem, as in the form of a conventional in-line electron gun, as in the dynamic focus electron gun disclosed in US Pat. No. 4,772,827, the electrode to which a focus voltage is applied is usually separated into a plurality of electrodes and one of these electrodes is used. The dynamic voltage Vd of the waveform as shown in FIG. 13 synchronized with the deflection yoke is applied to the other side, and the focus base voltage VG3 is applied to the other electrode opposite to each other. The electrode has a structure in which the horizontal electron beam is focused relatively strongly with respect to the vertical electron beam, and the electrode to which the dynamic voltage (Vd) is applied has a dynamic quadrupole lens unit in which the vertical radiation is stronger than the horizontal beam. QL) in the case where the electron beam is deflected in the periphery of the screen, the parabolic waveform shown in FIG. When the voltage is applied, the above-mentioned vertical electron beam focal length becomes longer, thereby canceling the difference in horizontal and vertical focusing at the periphery of the screen as shown in FIG. 12. As shown in FIG. The component will be removed.

However, as shown in Figs. 10 and 11, the effects of the horizontal and vertical magnetic fields applied to the electron beams R and B on the red and blue sides and the electron beam G on the center of rust are different from each other. The beams (R, B) are more affected and more distorted when deflected. Therefore, in order to make up for the influence difference between the magnetic fields, the dynamic quadrupoles acting on the electron beams of red, blue, and green must have different effects.

Therefore, the present invention has been invented to solve the above problems, and an object of the present invention is to provide a quadrupole lens that acts on an electron beam at the center of rust in the case of a dynamic quadrupole electrode constituting the dynamic quadrupole lens portion. Dynamic quadrupole of electron gun for color cathode ray tube which can compensate the effect of deflecting field acting differently on rust electron beam and red and blue electron beam by strengthening action of quadrupole lens on electron beam of red side and blue side It is to provide an electrode structure.

1 is a schematic cross-sectional view showing the configuration of an electron gun having a dynamic quadrupole electrode used in a color cathode ray tube;

2 is a shape diagram of an electron beam on a screen before a dynamic voltage is applied;

3 is a shape diagram of an electron beam showing a state in which a halo disappears around a screen as a dynamic voltage is applied;

4 is a configuration diagram of a first electrode to which a focus base voltage is applied, which is closer to the cathode side of two opposite electrodes constituting a dynamic quadrupole electrode according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating a shape of a second electrode to which a dynamic voltage opposite to the electrode of FIG. 4 is applied among two opposite electrodes constituting the dynamic quadrupole electrode according to an exemplary embodiment of the present invention; FIG.

6 is a cross-sectional view taken along line 6-6 of the central electron beam passing hole of FIG. 5;

7 is a cross-sectional view taken along line 7-7 of the side-side electron beam through hole of FIG. 5;

8 is an electron beam through hole shape diagram of the first electrode plate constituting the second electrode;

9 is a shape diagram of an electron beam passing hole of a second electrode plate constituting a second electrode according to another embodiment of the present invention;

10 is a distribution diagram of a magnetic field for deflecting an electron beam in a horizontal direction;

11 is a distribution diagram of a magnetic field for deflecting an electron beam in a vertical direction;

12 is a trajectory diagram of an electron beam showing difference in focusing of the electron beam at the center and periphery of the screen of the electron beam;

FIG. 13 is a waveform diagram showing waveforms of a dynamic voltage applied to a second electrode. FIG.

<Description of Major Symbols Used in Drawings>

K: cathodes G1 to G4: grid of electron guns

QL: Dynamic quadrupole lens part ML: Main lens part

V _G2 : Voltage applied to G2 grid V _G3 : Focus base voltage applied to G31, G32

Vd: Dynamic voltage C: Core part of electron beam

H: Halo part 11 of electron beam: 1st electrode (screen side electrode of G31 electrode)

12: second electrode (cathode side electrode of G32 electrode)

12 ': first electrode plate 12 ", 22": second electrode plate

Sg1: distance between the centers of electron beam passing holes R ', G', B 'of the first electrode

Sg2: Distance Sg2 between the centers of electron beam passing holes R ', G', and B 'of the second electrode

BR: Shortest distance between the center of the electron beam passing hole in the center and the electron beam passing hole in the side

R, G, B: red, green, blue electron beam R ', G', B ': electron beam passing hole

Bc: electron beam in the center of the screen Bp: electron beam in the center of the screen

Bh: horizontal part of the electron beam Bv: vertical part of the electron beam

In order to achieve the above object, the dynamic quadrupole electrode structure of the electron gun for color cathode ray tube according to the present invention controls and accelerates the cathode, which is a means for generating electrons, and the electron beam generated from the cathode, and collects grids for focusing on the screen. And separating some of the grids into a plurality of grids, and overlapping the focus base voltage and the focus base voltage on the first and second electrodes facing each other on the separated grid, respectively, to synchronize with the current of the deflection yoke. A dynamic quadrupole electrode structure of an electron gun for a color cathode ray tube configured to apply a parabolic waveform dynamic voltage to form a dynamic quadrupole lens portion: rather than the action of a quadrupole lens acting on an electron beam in the center of rust when a dynamic voltage is applied. Strengthen the intensity of the quadrupole lens acting on the electron beams (R, B) on the red and blue sides It is characterized by.

Of the quadrupole lens acting on the electron beams of the red and blue sides by increasing the size of the electron beam passing holes of the red and blue sides as compared with the size of the electron beam through holes at the center of the rust of the second electrode to which the dynamic voltage is applied. It is possible to increase the strength, and specifically, the second electrode includes a first electrode plate having a larger size of the electron beam through hole at the red and blue side than the size of the electron beam through hole at the center of rust, and the first electrode plate. And a pair of plate-shaped second electrode plates attached to the upper and lower portions of the electron beam passing holes adjacent to the electron beam passing holes in the center thereof, or the electrons on the side of the second electrode to which the dynamic voltage is applied. By increasing the horizontal size of the beam through hole to be larger than the horizontal size of the electron beam through hole in the center, the intensity of the quadrupole lens acting on the electron beam on the red and blue sides is increased. Specifically, the second electrode is attached to the first electrode plate and the first electrode plate having a larger size of the electron beam through hole at the red and blue side than the size of the electron beam through hole at the center of rust. And a plate-shaped second electrode plate having a larger horizontal size of the electron beam passing hole at the side than a horizontal size of the central electron beam passing hole.

In this case, the effect can be further enhanced by making the distance between the centers of the electron beam through holes of the second electrode larger than the distance between the centers of the electron beam through holes of the first electrode. The assembly can be improved by making the shortest distance between the center and the electron beam passing hole of the side equal to or larger than the shortest distance between the center of the electron beam passing hole of the center of the first electrode and the electron beam passing hole of the side.

The electron beam passing hole of the first electrode to which the focus base voltage is applied may have a keyhole shape, and in this case, the second electrode passes through the electron beam of red and blue sides as compared with the size of the electron beam passing hole in the center of rust. It consists of a 1st electrode plate with a large ball | bowl, and a pair of plate-shaped 2nd electrode boards which are attached to the upper and lower part of the electron beam through-hole of the said 1st electrode plate adjacent to the electron beam through-hole of the center. The intensity of the quadrupole lens acting on the electron beam on the blue side can be enhanced.

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

First, as shown in FIGS. 10 and 11, the effects of the horizontal and vertical magnetic fields applied to the electron beams R and B of the red and blue sides and the electron beam G of the center of rust, that is, the electron beams of the red and blue sides ( To compensate for the difference in magnetic field, where R and B are more affected and more distorted during deflection, the electron beam at the blue side is less than the action of the quadrupole lens acting on the electron beam at the center of rust. The dynamic quadrupole electrode is constituted by a structure in which the action of the quadrupole lens on (R, B) is strengthened.

That is, in FIG. 1, a cathode K, a control grid, and an acceleration grid, which are means for generating electrons, is provided, and an electron gun provided with a main lens unit ML for focusing an electron beam generated from the cathode K on a screen. The grid is configured so that a part of the grid is separated into a plurality of grids, and in the separated grid, when the parabolic waveform voltage synchronized with the current of the deflection yoke is applied to the applied voltage, quadrupoles are formed between the grids. When the dynamic voltage is applied, less than the action of the quadrupole acting on the electron beam of rust, it is characterized in that the strength of the quadrupole acting on the electron beam of blue is stronger.

For this purpose, the size of the through hole of the red and blue electron beams is larger than the size of the electron beam through hole of the rust electron beam passing hole of the applied quadrupole electrode, or the pass of the electron beam of rust of the quadrupole electrode to which dynamic is applied. The size of the passing holes of the red and blue electron beams may be larger than the horizontal size of the passing electron beams of the ball.

Meanwhile, the shape of the through hole of the electron beam through hole of the electrode to which the dynamic voltage is applied may be characterized by having a keyhole shape. In this case, the size of the green electron beam through hole of the electrode quadrupole forming portion to which the dynamic voltage is applied It is smaller than the size of electron beam through hole of red and blue, and it can be configured by welding and attaching the plate member on the upper and lower sides.

4 to 7 illustrate a dynamic quadrupole electrode structure of an electron gun for a color cathode ray tube according to an embodiment of the present invention.

Referring to FIG. 1, the dynamic quadrupole electrode structure of the electron gun for color cathode ray tubes consists of the first electrode 11 which is the screen side electrode of G31 electrode, and the second electrode 12 which is the cathode side electrode of G32 electrode.

In FIG. 4, the electron beam through holes R ', G', and B 'of the first electrode 11 to which the focus base voltage VG3 is applied have a keyhole shape.

As shown in FIGS. 5 to 7, the second electrode 12 to which the dynamic voltage Vd is applied has an electron beam through hole at the red and blue side as compared with the size of the electron beam through hole G 'at the center of rust. R ', B') is formed at the upper and lower portions of the first electrode plate 12 'having a large size and the electron beam passing holes R', G ', B' of the first electrode plate 12 '. It consists of a pair of plate-shaped 2nd electrode plate 12 ", 12" attached adjacent to the center electron beam through-hole G '.

In addition, according to another exemplary embodiment of the present invention, as shown in FIGS. 8 and 9, the second electrode 12 to which the dynamic voltage Vd is applied is formed at the electron beam passing hole G ′ at the center of the rust. Compared to the size, the first and second electrode plates 12 'having large sizes of the electron beam passing holes R' and B 'of the red and blue sides are attached to the first electrode plate 12' and passed through the electron beam of the side. The horizontal size of the balls (R ', B') may be composed of a plate-shaped second electrode plate 22 "larger than the horizontal size of the center electron beam passing hole (G ').

4 to 9, the distance Sg2 between the centers of the electron beam passing holes R ', G', and B 'of the second electrode to which the dynamic voltage Vd is applied passes through the electron beam of the first electrode. It is formed larger than the distance Sg1 between the centers of the balls R ', G', and B ', and the shortest distance between the center of the electron beam passing hole in the center of the second electrode 12 and the electron beam passing hole in the side ( BR is formed equal to or greater than the shortest distance BR between the center of the electron beam passing hole in the center of the first electrode 11 and the electron beam passing hole in the side.

In this configuration, the electron beams R and B of the side are more divergent than the electron beam G of the center in FIG. 11 and the focusing distance is increased, so that overfocusing is not performed. It is possible to compensate for the difference in the operation between (G) and the electron beams (R, B) of the side, and three types of electron beams including the electron beams (R, B) of the side as well as the central electron beam (G). All of the (R, G, B) can remove the halo portion (H) and obtain a beam spot formed only of the core portion (C) of uniform size.

That is, the shape of the electron beam through hole on the side to which the focus base voltage is applied has a shape of a key hole in consideration of assemblability. The opposite electrode side of the dynamic beam has three electron beam through holes and a horizontal hole above and below the electron beam. The plate-shaped grid has a welding-mounted structure, and the red and blue electron beams are larger than the rust electron beams (øc) to increase the red and blue electron beams (øs). The action of the quadrupole lens on the beam is made larger as shown by the arrow in FIG. When the dynamic voltage is applied, as the intensity of the main lens is weakened, the convergence characteristic of the electron beam side of the green and blue electron beams is weakened. As the distance between the green beam of the electrode to which the dynamic voltage is applied and the red and blue non-pass hole centers is larger than the distance between the centers of the blue beam passing holes, the red and blue electrons are applied when the electrostatic quadrupole is applied. By directing the beam toward the electron beam side of rust, the difference in magnetic field is compensated. The minimum distance of the electron beam passing space of the focus base voltage applying electrode and the minimum distance of the non-passing space of the quadrupole portion of the electrode to which the dynamic voltage is applied are the same as shown in FIGS. 4 and 8 to facilitate assembly. Done.

According to the structure and action of the dynamic quadrupole electrode structure of the electron gun for color cathode ray tubes of the present invention described above, the quadrupole lens in the electron beam on the blue side is smaller than the action of the quadrupole lens acting on the electron beam in the center of rust. By strengthening the effect, it is possible to compensate for the influence of the deflection magnetic field acting differently on the electron beam of rust and the electron beam of red and blue.

Claims (11)

Cathodes K, which are means for generating electrons, and grids G1-G4 for controlling and accelerating electron beams generated from the cathodes K, for focusing on the screen, and among the grids G1-G4; A part is divided into a plurality of grids G31 and G32, and the focus base voltage VG3 and the first and second electrodes 11 and 12 are respectively opposed to the separated grids G31 and G32. Dynamic quadrupole electrode structure of electron gun for color cathode ray tube configured to apply dynamic voltage Vd of parabolic waveform synchronous with current of deflection yoke superimposed on focus base voltage VG3 to form dynamic quadrupole lens part QL In: When the dynamic voltage Vd is applied, the intensity of the quadrupole lens acting on the electron beams R and B on the blue side is stronger than that of the quadrupole lens acting on the electron beam G in the center of green. Dynamic quadrupole electrode structure of electron gun for color cathode ray tube. 2. The electron beam passing holes R 'and B of the red and blue sides as compared with the size of the electron beam passing holes G' at the center of the rust of the second electrode 12 to which the dynamic voltage Vd is applied. Dynamic quadrupole electrode structure of electron gun for color cathode ray tube, characterized by large size. 3. The second electrode 12 has a larger size of the electron beam through holes R 'and B' on the red and blue sides than the size of the electron beam through holes G 'at the center of rust. The electron beam passing hole G 'at the center of the first electrode plate 12' and the upper and lower portions of the electron beam passing holes R ', G' and B 'of the first electrode plate 12'. A dynamic quadrupole electrode structure of an electron gun for a color cathode ray tube, comprising a pair of plate-shaped second electrode plates 12 ", 12 " The distance Sg2 between the centers of the electron beam through holes R ', G', and B 'of the second electrode to which the dynamic voltage Vd is applied is the electron ratio of the first electrode. A dynamic quadrupole electrode structure of an electron gun for color cathode ray tubes, characterized in that it is larger than the distance Sg1 between the centers of the through holes R ', G', and B '. The electron beam at the center of the first electrode 11 according to claim 2 or 3, wherein the shortest distance BR between the center of the electron beam passing hole at the center of the second electrode 12 and the electron beam passing hole at the side is formed. A dynamic quadrupole electrode structure of an electron gun for a color cathode ray tube, which is equal to or greater than the shortest distance (BR) between the center of the beam passing hole and the electron beam passing hole on the side. The horizontal size of the electron beam through holes R 'and B' on the side of the second electrode 12 to which the dynamic voltage Vd is applied is horizontal. A dynamic quadrupole electrode structure of an electron gun for color cathode ray tubes, characterized by being larger than its size. 7. The second electrode 12, to which the dynamic voltage Vd is applied, has an electron beam through hole R 'at the red and blue side as compared with the size of the electron beam through hole G' at the center of rust. The first electrode plate 12 'having a large size of B') and the horizontal size of the electron beam passing holes R 'and B' on the side are attached to the first electrode plate 12 'and the electron beam at the center. A dynamic quadrupole electrode structure of an electron gun for a color cathode ray tube, characterized by comprising a plate-shaped second electrode plate (22 ") larger than the horizontal size of the passage hole (G '). The distance Sg2 between the centers of electron beam through holes R ', G', and B 'of the second electrode to which the dynamic voltage Vd is applied is the electron ratio of the first electrode. A dynamic quadrupole electrode structure of an electron gun for color cathode ray tubes, characterized in that it is larger than the distance Sg1 between the centers of the through holes R ', G', and B '. 8. The electron beam at the center of the first electrode 11 according to claim 6 or 7, wherein the shortest distance BR between the center of the electron beam passing hole at the center of the second electrode 12 and the electron beam passing hole at the side is formed. A dynamic quadrupole electrode structure of an electron gun for a color cathode ray tube, which is equal to or greater than the shortest distance (BR) between the center of the beam passing hole and the electron beam passing hole on the side. The color cathode ray tube for a color cathode ray tube according to claim 1, wherein the electron beam through holes R ', G', B 'of the first electrode 11 to which the focus base voltage VG3 is applied have a keyhole shape. Dynamic quadrupole electrode structure of an electron gun. 12. The electron beam passing holes R 'and B of the red and blue sides according to claim 10, wherein the second electrode 12 to which the dynamic voltage Vd is applied is larger than the size of the electron beam passing hole G' at the center of rust. The first electron plate 12 'having a large size of') and the electron beams at the center of the upper and lower portions of the electron beam through holes R ', G', and B 'of the first electrode plate 12'. A dynamic quadrupole electrode structure of an electron gun for a color cathode ray tube, comprising a pair of plate-shaped second electrode plates 12 &quot; and 12 " attached adjacent to a passage hole G '.