KR20030027412A - A voltage connection and electric-pole shape of An uni-bi electron-gun with A horizontally-amplifying uni-lens - Google Patents

Abstract

PURPOSE: A voltage connecting and electrode structure for a uni-bi electron gun is provided to achieve improved horizontal focusing performance by permitting the horizontal beam to have a diameter larger than the diameter of the vertical beam when electron beams are incident to the main lens. CONSTITUTION: A uni-bi electron gun comprises a cathode, a control electrode, a screen electrode, first and second quadrupole lenses, and a main lens. A voltage connecting and electrode structure for the uni-bi electron gun comprises a uni-lens interposed between the screen electrode and the first quadrupole lens, and constituted asymmetrically in such a manner that the intensity of the electrostatic lens in the vertical direction is higher than the intensity in the horizontal direction. The uni-lens includes a first electrode(G4) applied with a constant voltage, and which has a circular shape at the side emitting electron beams; and a second electrode(G5-1) applied with a dynamic voltage, and which has a longitudinally elongated shape at the side where electron beams are incident.

Description

A voltage connection and electric-pole shape of An uni-bi electron-gun with A horizontally-amplifying uni-lens}

The present invention relates to an electron gun for a color cathode ray tube, and more particularly, to a structure and a shape of an electrode of an electron gun having an improved horizontal beam diameter at the periphery of a screen.

In general, the electron gun for the color cathode ray tube is installed in the neck portion of the cathode ray tube to emit hot electrons, the image quality is different depending on the state in which the electron beam emitted from the electron gun is landing on the fluorescent film. Therefore, many electron guns have been developed to reduce the focus characteristic and the aberration of the electron lens so that the electron beam emitted from the electron gun can be accurately landed at the fluorescent point of the fluorescent film. In particular, in order to reduce the electric field of the cathode ray tube, the deflection angle of the cathode ray tube is increased and the length of the electron gun is reduced. In this case, however, the focusing length of the electron beam landing at the periphery of the fluorescent film is relatively longer than the focusing length of the electron beam landing at the central portion of the fluorescent film, and the focus characteristic of the electron beam is degraded at the periphery of the screen.

As a result, as the polarization and planarization of the cathode ray tube increases, the focal length difference increases around the screen and the astigmatism caused by the deflection yoke is further increased, which requires strong astigmatism correction and focal length correction. For the strong astigmatism correction, the difference in potential across the electrodes forming the quadrupole lens must be large, and the focal length correction around the screen must be large, so that a high voltage must be generated around the screen. However, these high voltages cause circuit reliability and withstand voltage problems between electron gun electrodes. In addition, the incident angle of the beam incident on the screen at the periphery of the screen is small and the vertical angle is increased due to the horizontal focusing and vertical divergence of the action of the quadrupole lens close to the main lens when incident on the screen. The problem arises that the horizontal mirror becomes larger.

Figure 1 shows the voltage connection of a conventional Uni-Bi electron gun. As shown in FIG. 1, the G1 electrode, the G2 electrode, the G3 electrode, the G4 electrode, the G5-1 electrode constituting the Q1 lens, and the G5-3 electrode constituting the Q2 lens, such as the G5-2 and G5-2 electrodes, And the G6 electrode constituting the main lens is shown. The dynamic voltage is applied to the G5-1 electrode and the G5-3 electrode, and the constant voltage is applied to the G3 and G5-2 electrodes.

Fig. 2 shows the shape and structure of a beam through hole of a uni-lens of a conventional Uni-Bi electron gun.

Referring to the shapes of the electrodes constituting the Q2 lens, the beam exit hole shape of each of the exit side and the incident side of the electrodes G5-2 and G5-3 which are adjacent to each other are shown, and the electron beam exit side of the G5-2 electrode. The beam through hole has a horizontal, independent R, G, and B shape, and the beam through hole on the electron beam incident side of the G5-3 electrode has a circular shape.

Referring to the shapes of the electrodes constituting the Q1 lens, the beam exit hole shape of each of the exit side and the incident side of the electrodes G5-1 and G5-2 which are adjacent to each other are shown, and the electron beam exit side of the G5-1 electrode. The beam through hole has a horizontal, independent R, G, and B shape, and the beam through hole on the electron beam incident side of the G5-2 electrode has a vertical, independent shape with a R, G, and B shape.

On the other hand, the beam through hole shape of the electron beam incident side of the G5-1 electrode is R, G, B independent circle, and the beam through hole shape of the electron beam exit side of the G4 electrode is formed R, G, B independent circle. .

The operation of the conventional electron gun having such a voltage connection and an electrode shape is as follows.

First of all, the Q2 lens has a strong divergence and a horizontal focus. By the way, the result is that the horizontal is over-focused. To correct this, the Q1 lens, which serves as horizontal divergence and vertical focusing, is placed in front of the Q2 lens. However, in the uni-by electron gun for color cathode ray tubes, the horizontal beam diameter of the peripheral portion is deteriorated compared to the center of the screen as the screen is flattened, enlarged, and wide-angled. In particular, in a uni-lens in which the dynamic wave voltage is applied as the electron beam is scanned on the screen and the lens intensity is changed dynamically, the intensity of the uni-lens is equal to the horizontal and vertical as the dynamic voltage is applied to the center or periphery of the screen. Because of this intensity change, it is difficult to adjust the incident angle or the beam diameter at which the horizontal beam is incident on the main lens.

The present invention is to solve the problems of the prior art, and when the electron beam is incident on the main lens, the horizontal beam diameter is larger than the vertical beam diameter to improve the horizontal focusing, and as the beam is deflected, the uni-lens becomes horizontal divergence and vertical focusing. It reduces the deflection aberration caused by the deflection magnetic field by reducing the horizontal overfocusing caused by the vertical strong divergence of the Q2 lens, and by reducing the incident angle and beam diameter of the electron beam incident on the main lens when the dynamic voltage is applied during deflection. As a result, the objective is to improve the horizontal beam diameter also in the peripheral portion.

1 is a voltage connection structure of a conventional uni-by electron gun,

2 is a view of a beam through hole of a uni-lens in a conventional uni-by electron gun;

3 is a shape and a structure of a beam passing hole forming a uni-lens according to the present invention;

4 is another shape and structure of a beam through hole forming a uni-lens according to the present invention;

5 is another shape and structure of a beam through hole forming a uni-lens according to the present invention, and

Fig. 6 is an electron beam flowchart showing the flow of electron beams in the electron gun structure having the beam passing holes of the present invention.

-Explanation of symbols for the main parts of the drawings-

Q1: first quadrupole lens Q2: second quadrupole lens

G4: first electrode of uni-lens G5-1: second electrode of uni-lens

For this purpose, the present invention provides an electrode shape capable of horizontally lengthening an electron beam by making the intensity of the uni-lens asymmetric, that is, making the vertical intensity larger than the horizontal intensity.

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

The wiring structure of the constant voltage and the dynamic voltage of each electrode according to the present invention is the same as the conventional voltage wiring structure shown in FIG. As shown in FIG. 1, the G1 electrode, the G2 electrode, the G3 electrode, the G4 electrode, the G5-1 electrode constituting the Q1 lens, and the G5-3 electrode constituting the Q2 lens, such as the G5-2 and G5-2 electrodes, And the G6 electrode constituting the main lens is shown. The dynamic voltage is applied to the G5-1 electrode and the G5-3 electrode, and the constant voltage is applied to the G3 and G5-2 electrodes.

3 shows the shape and structure of a beam through hole forming a uni-lens of a Uni-Bi electron gun according to the present invention. In the electrode structure according to the present invention, the G4 direction, that is, the electron beam, is selected from among the three beams G3-1 through which the dynamic voltage is applied among the three electrodes G3, G4, and G5-1 forming the uni-lens in the uni-by electron gun. The shape of the beam passing holes is configured so that the electrostatic lens intensity formed between the beam passing hole of the incident part and the G4 electrode facing the G5-1 electrode is asymmetric, that is, the vertical is stronger than the horizontal. As shown in Fig. 3, the shape of the beam through hole on the electron beam incident side of the G5-1 electrode is formed as an independent length of R, G, and B, and the shape of the beam through hole of the G4 plate electrode opposite thereto is R. , G, B Independent form. Here, the shape of the beam passing hole on the electron beam incident side of the G5-1 electrode can also be configured as an elongated flat.

Fig. 4 shows another shape and structure of the beam passing hole forming the uni-lens of the Uni-Bi electron gun according to the present invention. In the electrode structure according to the present invention, the G4 direction, that is, the electron beam, is selected from among the three beams G3-1 through which the dynamic voltage is applied among the three electrodes G3, G4, and G5-1 forming the uni-lens in the uni-by electron gun. Any electrode shape may be formed by configuring the shape of the beam passing holes such that the electrostatic lens intensity formed between the beam passing hole of the incident portion and the G4 electrode facing the G5-1 electrode is asymmetric, that is, the vertical is stronger than the horizontal. As another example, as shown in FIG. 4, the shape of the beam through hole on the incident side of the electron beam of the G5-1 electrode is formed in an independent circle of R, G, and B, and the beam through hole of the G4 plate electrode opposite thereto is formed. The shape of is composed of R, G and B independent horizontally. Here, the shape of the beam passing hole of the G4 plate electrode can also be configured as a horizontal flat.

Fig. 5 shows another shape and structure of the beam passing hole forming the uni-lens of the uni-by electron gun according to the present invention. As shown in Fig. 6, an R, G, B integral type horizontal plate electrode is formed on the G4 electrode. In addition, the G4 electrode may be configured as a plate electrode separated up and down.

Referring to the operation of the electron gun structure having the shape and structure of the beam through hole of the uni-lens according to the present invention.

In general, the intensity of the Q1 lens plays a role of horizontal divergence and vertical focusing, and the intensity of the Q2 lens plays a role of horizontal convergence and vertical divergence. Here, the electrostatic lens intensities formed by the electrode structures G4 and G5-1 according to the present invention are asymmetric so that the vertical is larger than the horizontal, so that the flow of the electron beam becomes horizontal. That is, the electron beam is emitted horizontally by the G3, G4 and G5-1 electrodes forming the uni-lens, in particular by the G4 electrode having the circular beam passing hole and the G5-1 electrode having the longitudinal beam passing hole. It is focused vertically. As a result, when the electron beam is incident on the main lens, the horizontal beam diameter is made larger than the vertical beam diameter to improve horizontal focusing. In addition, horizontalization of the electron beam formed by the G4 electrode and the G5-1 electrode may reduce horizontal over-focusing due to vertical strong divergence of the main lens and the Q2 lens. In addition, even when a dynamic voltage is applied during deflection, the beam diameter and the incident angle to the main lens are reduced, and as a result, the deflection aberration due to the deflection magnetic field can be reduced.

6 shows the intensity of the uni-lens and the trajectory of the electron beam according to the present invention. As shown in Fig. 6, if the horizontal intensity of the uni-lens is made thinner than the vertical intensity in the center of the screen to make the electron beam horizontal, the horizontal beam diameter incident angle Φ becomes large at the center of the screen, resulting in a smaller beam diameter. Also, when deflected to the periphery, the intensity of the uni-lens varies dynamically with horizontal divergence and vertical focusing, so that the horizontal beam diameter in the main lens becomes smaller as the dynamic voltage increases, and at the same time, the angle of incidence on the screen becomes smaller. . As a result, the deflection aberration due to the deflection yoke can be minimized.

According to the electrode structure and shape of the electron gun according to the present invention having the above structure and action, when the electron beam is incident on the main lens, the horizontal beam diameter becomes larger than the vertical beam diameter, so that the horizontal focusing is good, and the uni-lens is horizontal even when the beam is deflected. Because of divergence and vertical focusing, horizontal overfocusing due to vertical strong divergence of Q2 lens is reduced, and when the dynamic voltage is applied during deflection, the angle of incidence and beam diameter of the electron beam incident on the main lens is reduced, which is caused by the deflection magnetic field. As the deflection aberration is reduced, the horizontal beam diameter is improved not only in the center portion but also in the periphery portion, resulting in better image quality.

While the invention has been shown and described with respect to certain preferred embodiments thereof, the invention is not limited to these embodiments, and has been claimed by those of ordinary skill in the art to which the invention pertains. It includes all variants of various forms that can be implemented without departing from the technical idea.

Claims (7)

In the uni-by electron gun for color cathode ray tube comprising a cathode, a control electrode and a screen electrode and a first, a second quadrupole lens and a main lens forming a triode, Voltage connection and electrode shape of the uni-by electron gun for color cathode ray tube, characterized in that forming a uni-lens between the screen electrode and the first quadrupole lens the strength of the electrostatic lens portion asymmetrically more vertically than horizontal. rescue. The method of claim 1, wherein the uni-lens A first electrode having a constant voltage applied thereto and having a circular electrode shape at a side from which the electron beam is emitted; And A voltage connection and an electrode structure of a uni-by electron gun for color cathode ray tubes, wherein a dynamic voltage is applied and the electrode on the side of which the electron beam is incident consists of a second electrode having an elongated shape. The method of claim 1, wherein the uni-lens A first electrode having a constant voltage applied thereto and having a circular electrode shape at a side from which the electron beam is emitted; And Uni-by electron gun for color cathode ray tube, characterized in that the dynamic voltage is applied, and the electrode shape of the side on which the electron beam is incident is an elongated flat, and is composed of a second electrode coupled with an electrode having a circular R, G, B beam passing hole. Voltage connection and electrode structure. The method of claim 1, wherein the uni-lens A first electrode to which a constant voltage is applied and whose electrode shape on the side from which the electron beam is emitted is horizontal; And A voltage connection and an electrode structure of a uni-by electron gun for a color cathode ray tube, wherein a dynamic voltage is applied and the electrode on the side of which the electron beam is incident is composed of a circular second electrode. The method of claim 1, wherein the uni-lens A first electrode to which a constant voltage is applied and the electrode shape of the side from which the electron beam is emitted is coupled to an electrode having a circular flat R, G, and B beam passing hole; And A voltage connection and an electrode structure of a uni-by electron gun for a color cathode ray tube, wherein a dynamic voltage is applied and the electrode on the side of which the electron beam is incident is composed of a circular second electrode. The method of claim 1, wherein the uni-lens A first electrode having a constant voltage applied thereto, the first electrode being a plate electrode having an electrode shape on the side from which the electron beam is emitted; And A voltage connection and an electrode structure of a uni-by electron gun for a color cathode ray tube, wherein a dynamic voltage is applied and the electrode on the side of which the electron beam is incident is composed of a circular second electrode. The method of claim 1, wherein the uni-lens A first electrode to which a constant voltage is applied and an electrode shape of the side from which the electron beam is emitted is a horizontal plate electrode of an R, G, B integrated type; And A voltage connection and an electrode structure of a uni-by electron gun for a color cathode ray tube, wherein a dynamic voltage is applied and the electrode on the side of which the electron beam is incident is composed of a circular second electrode.