KR20030071223A - Electron gun for color CRT - Google Patents

Abstract

PURPOSE: An electron gun of a color CRT(Cathode Ray Tube) is provided to obtain aiming astigmatism by increasing the vertical measurement of a main lens aperture part. CONSTITUTION: A triode part emits and controls electron beam. The first and second focusing electrodes(60,61) are installed for fixing and supporting a main lens. A pair of electrostatic field controlling electrodes(51,52) are installed in the first and second focusing electrode. A bead glass part(70) fixes and holds the electrodes spaced apart from each other. At this time, an enlarged part(62) used as an outer part of the first and second focusing electrode, is formed larger than any other electrodes for increasing the vertical size of the electrostatic field controlling electrodes.

Description

Electron gun for color cathode ray tube {Electron gun for color CRT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun of a cathode ray tube mounted inside a television. More specifically, the first and second collecting acceleration electrodes and the first and second collecting acceleration electrodes for focusing and accelerating the electron beam scanned from a triode portion, which is a cathode, a control electrode, and an acceleration electrode A vertical dimension of the electrostatic field control electrode mounted in the second collecting acceleration electrode and the main lens aperture, which is the electron beam passing hole of the electrostatic field control electrode, and the interval between the first and second collecting acceleration electrodes; By installing bead glass so that the distance between the electrodes is uniform, by reducing the size of the electron beam according to the weakening of the electron beam intensity passing through the main lens aperture to prevent the degradation of the resolution of the conventional color CRT In particular, the charge distribution between the electrodes and the bead glass is uniformly formed by maintaining a constant distance between the electrodes and the bead glass. It relates to an electron gun of a color CRT tube which is made to improve the withstand voltage characteristics.

Cathode-ray-tubes, generally called TV cathode ray tubes, convert electrical signals into optical images such as images, figures, and characters by the action of an electron beam, and explain the configuration thereof. Is as follows.

As shown in FIG. 1, the color cathode ray tube is a panel of glass material coated on an inner surface of a three-primary (red, green, blue) phosphor 3 which emits light upon collision of the scanned electron beam and converts it into visual information. Panel (1), and the internal shape is coated with the internal graphite while the overall shape is a cone shape, the glass funnel (2) fixed to the panel (1) to form a bulb-type vacuum container (2) And an electron gun 6 which is inserted into the neck 5 of the funnel 2 and emits an electron beam in accordance with an electric signal for displaying image information, and is mounted to the outer neck 5 of the funnel 2. A deflection yoke 7 for deflecting the electron beam emitted from the electron gun 6 up, down, left, and right to be reproduced two-dimensionally on the panel 1, and positioned behind the three primary phosphors 3. The electron beam mounted in the panel 1 and deflected by the deflection yoke 7 It consists of a shadow mask (shadow mask) (4) that is a color selection electrode to be scanned to the fluorescent surface of the phosphor 3 at a predetermined position.

In addition, the detailed configuration of the electron gun 6, which is a component of the color cathode ray tube, will be described. As shown in FIG. 2, the cathode 8 which emits electrons according to the heat source of the embedded heater, and the cathode (8) a control electrode 9 for controlling the amount of electrons emitted from the acceleration electrode, an acceleration electrode 10 for accelerating a predetermined amount of electrons controlled by the control electrode 9 in the form of a beam, and the acceleration electrode 10 A first focusing / acceleration electrode 11 (hereinafter referred to as a first focusing electrode) 11 in which a main lens is formed so as to focus and accelerate the electron beam scanned through the panel 1 to be scanned onto the phosphor 3 of the panel 1; A shielding electrode mounted on a second focusing / acceleration electrode (hereinafter referred to as a second focusing electrode) 12 and the second focusing electrode 12 to shield and weaken the leakage magnetic field of the deflection yoke 7. 13 and bead glass fixed to both ends of the electrodes to fix and maintain the electrodes at predetermined intervals. It consists of 14. At this time, three electron beam through holes (circular holes) are formed in the control electrode 9, the acceleration electrode 10, the first collection acceleration electrode 11, and the second collection acceleration electrode 12 in plan view. In particular, the control electrode 9 and the acceleration electrode 10 are formed in a plate shape, and the first and second acceleration acceleration electrodes 11 and 12 are formed in a non-circular cylinder shape.

Among the electrodes of the color cathode ray tube electron gun 6 configured as described above, a voltage of 500 to 1000 V is applied to the acceleration electrode 10, and a high voltage of 25 to 35 kV is applied to the second collector acceleration electrode 12. When the middle acceleration voltage corresponding to 20-30% of the second acceleration acceleration electrode 12 is applied to the acceleration acceleration electrode 11, the first acceleration acceleration electrode 11 and the second acceleration acceleration electrode 12 and The main lens is formed while an equipotential surface is formed in the opening hole of the first and the second acceleration acceleration electrode 12 by the voltage difference of the negative electrode 8 and the control. The electron beam scanned through the electrode 9 and the acceleration electrode 10 is focused and accelerated by the main lens to pass through the electron beam through hole of the shadow mask 4, and the electron beam passes through the inner surface of the panel 1. The screen is formed on the panel 1 while hitting the three primary colors (red, green, blue) phosphor 3.

However, since the first collection acceleration electrode 11 and the second collection acceleration electrode 12 are formed in a rectangular cylindrical shape having a short length in the vertical direction and a long length in the horizontal direction, application of a predetermined voltage is performed as described above. When the electron beam passes through the openings of the first and second collection acceleration electrodes 11 and 12 in which the main lens is formed, the horizontal focusing force is compared with the vertical focusing force of the main lens formed in the hole. Since the remarkably weak action, the aspect ratio of the electron beam is changed according to the focusing force difference in the horizontal and vertical directions, thereby causing severe astigmatism, and the astigmatism deteriorates the resolution around the screen of the cathode ray tube. There was a big problem with being degraded.

In order to solve the above-mentioned problem, the electron gun for color cathode ray tube of US Patent 5,512,797 and the electron gun for color cathode ray tube of US Patent 5,146,133 have been proposed in recent years. As shown in FIG. The first and second acceleration and acceleration electrodes 11 and 12, which focus and accelerate the electron beam, are formed in a U-shape and have a long rectangular shape and a short transverse direction in order to prevent degradation of resolution at the center. Electrostatic field control electrodes 15 and 16 provided with lens apertures 20 and 21 are provided, respectively, and in another 5,146,133 color cathode ray tube electron gun, an electron beam is focused and accelerated as shown in FIG. A transverse electrostatic field control electrode 15a having three elliptical main lens apertures 20a long in the longitudinal direction and short in the transverse direction in the first and second acceleration acceleration electrodes 11a and 12a; Oval in the center Longitudinal electrostatic field control electrodes 16a each having a concave shape at both ends are formed to be formed while the main lens aperture 21a of the shape is formed, so that the electron beams are formed on the first and second collection acceleration electrodes 11. The main lens is formed by the electrostatic field control electrodes 15, 15a, 16, and 16a, which pass through (11a) (12) and 12a and have different sizes in the horizontal direction (wc) and in the vertical direction (wcv). Positive convergence (OCV) is possible by adjusting the intensity of the cross-section. However, if a high current is generated in the electron gun 6, the current density of the crossover does not increase as the beam current value increases due to the space charge repulsion effect. As the distribution is closer to the flat and uniform distribution rather than the Gaussian distribution, the crossover deteriorates and spots and deterioration appear on the screen.

When the third electrode is moved to the second electrode in order to improve the deterioration on the screen, the potential of crossover is increased and the space charge repulsion effect is reduced. As a result, the cathode 8, the control electrode 9, and the acceleration are accelerated. As the divergence angle of the electron beam emitted from the tripolar portion of the electrode 10 increases, the size of the electron beam increases in the main lens portion, and the spherical aberration also increases, thereby increasing the spot on the screen as shown in FIG. 5. In this case, if the divergence angle increased as described above is reduced by adjusting the unipotential lens, the astigmatism of the electron beam emitted from the triode is also changed, and there is a big problem that the deviation of the desired astigmatism is out of range. The focusing force in the vertical direction rather than the horizontal direction is increased by increasing the size of the vertical direction of the electrostatic field control electrodes 15, 15a, 16, 16a to obtain proper astigmatism. Sikyeotjiman reduced, and there were also significant problems as shown in Fig. 6 is out of the appropriate range of the astigmatism that is to be a spot on the screen, and degradation occurs.

In addition, when a high pressure is applied to the second collection acceleration electrodes 12 and 12a, the first and second collection acceleration electrodes 11 serving as the main lenses 11 may be used to minimize the shock transmitted to the bead glass 14. All the electrodes 8, 9, 10, 11, 12 are formed in the bead glass 14 in which the 11a, 12, 12a are positioned to form a groove having a predetermined size. (13) is fixed and held at a predetermined interval, but the grooves are equally spaced between the electrodes 8, 9, 10, 11, 12, 13 and the bead glass 14. There is also a big problem that the charge distribution generated between the electrodes and the bead glass 14 is not evenly formed.

Furthermore, when increasing the vertical size of the electrostatic field control electrodes 15, 15a, 16, 16a in order to obtain an appropriate astigmatism of the electron beam, the first and second collection acceleration electrodes 11 are fixed. (11a) (12) There was also a problem in that the size and the size of the bead glass 14 and the funnel neck 5 were restricted to the inner diameters of the 12a and 12a.

The present invention has been made in order to solve the above problems, the first and second collecting acceleration electrode for focusing and accelerating the electron beam and the electrostatic field control electrode fixed in the first and second collecting acceleration electrode, and the electrostatic field control By increasing the vertical dimension of the main lens aperture which is the electron beam through hole of the electrode, the objective is to reduce the electron beam size according to weakening the vertical main lens intensity of the electrostatic field control electrode so that the desired astigmatism can be realized. .

In addition, the bead glass is provided so that the distance between the first and second collecting acceleration electrode and the distance between the other electrodes is uniformly formed, thereby evenly forming the charge distribution generated between the electrode and the bead glass. It is another object to improve the withstand voltage characteristics.

1 is a cross-sectional view showing the structure of a conventional color cathode ray tube.

FIG. 2 is a cross-sectional view illustrating a coupled state of the electron gun among the components of FIG. 1. FIG.

3 is a perspective view of a collecting acceleration electrode equipped with an electrostatic field control electrode of the components of a conventional electron gun.

4 is a perspective view of a collecting acceleration electrode equipped with another electrostatic field control electrode;

5 is a state diagram showing focus of an electron beam by spherical aberration of a conventional electron gun;

Figure 6 is a state diagram showing the difference in astigmatism of the electron beam by the spherical aberration of the conventional electron gun.

Figure 7 is an enlarged perspective view of the electrostatic field control electrode mounted on the coupled state and the acceleration electrode of the present invention for the cathode ray gun.

8 is another embodiment of the electrostatic field control electrode.

9 is another embodiment of bead glass that is a component of the present invention.

10 is a state diagram showing the difference between the focused state and the astigmatism of the electron beam by the electron gun spherical aberration of the present invention.

<Explanation of symbols for the main parts of the drawings>

8. Cathode 9. Control electrode 10. Acceleration electrode 50. Electron gun

51, 52. Electrostatic Field Control Electrode 51a, Horizontal Electrostatic Field Control Electrode

52a. Long type electrostatic field control electrodes 53, 54. Square main lens aperture

53a, 54a. Ellipse main lens diameter 60. The first acceleration electrode

61. Second collector acceleration electrode 62. Enlarged portion

70. Bead glass 71. Indent 72. Uneven

7 is an enlarged perspective view of the coupled state of the cathode electron gun of the present invention and the electrostatic field control electrode mounted on the collecting acceleration electrode, and FIG. 8 illustrates the first and second collecting acceleration electrodes of the components of the present invention. An embodiment of another configuration of the mounted electrostatic field control electrode is shown.

In order to achieve the above object, the electron gun 50 for the color cathode ray tube of the present invention includes: three-pole portions (8) (9) (10) for emitting and controlling electrons according to a heat source of an embedded heater to scan in a beam form; A first collecting electrode 60 and a second collecting acceleration electrode 61 in which a main lens is formed to collect and accelerate the electron beam scanned through the triodes 8, 9, and 10 to the screen; Electrostatic field control electrodes 51 and 52 installed in the first and second acceleration electrodes 60 and 61, and bead glass 70 for fixing and holding the electrodes at predetermined intervals An electron gun for a configured color cathode ray tube;

In order to increase the size of the vertical holes 53 and 54 of the electrostatic field control electrodes 51 and 52 installed in the first and second collection acceleration electrodes 60 and 61, the first collection acceleration electrodes The enlarged portion 62 in which the outer portion of the 60 and the second collection acceleration electrode 61 is larger than the other electrode is formed.

In addition, as another embodiment of the electrostatic field control electrodes 51, 52 that are mounted and fixed in the first and second collection acceleration electrodes 60, 61, as shown in Figure 8, the longitudinal length A horizontally-shaped electrostatic field control electrode 51a having three elliptical main lens apertures 53a each of which is enlarged to a predetermined size; The longitudinal length of the main lens aperture 54a formed at the center is the same as that of the main lens aperture 53a of the transverse electrostatic field control electrode 51a, and the longitudinal length thereof is enlarged to a constant size, and both ends thereof are semi-elliptical. And an elongated electrostatic field control electrode 52a formed concave.

The enlarged portion 62 is formed in a region where the electrostatic field control electrodes 51, 51a, 52, and 52a are positioned from the main lens forming portion, and particularly, the enlarged portion 62 has a vertical length. In this case, is formed to a size that can be mounted within the diameter of the cathode ray tube neck (5).

The bead glass 70 is beaded so that the enlarged portion 62 of the first and second collection acceleration electrodes 60 and 61 formed to be enlarged to a size that can be mounted in the cathode ray tube net diameter. A buried portion 71 having a predetermined size groove is formed in a predetermined portion, and the interval between the first and second collection acceleration electrodes 60 and 61 and the enlarged portion 62 and the other electrodes 8. (9) It is fixed to both ends of the electrodes (8), (9), (10), (60) and (61) so that the intervals between the (9) and 10 are formed uniformly.

9 shows an embodiment of another configuration of the bead glass of the components of the electron gun for color cathode ray tube of the present invention, the bead glass 70, the first, second collection acceleration electrodes 60, 61 enlarged portion In order to prevent cracking of the buried portion 71 according to the buried fixing of the (62), the concave-convex portion 72 of the same size is formed on the outer portion of the buried portion 71 to have a uniform thickness.

Hereinafter, the effect | action of the electron gun for color cathode ray tubes of this invention is demonstrated in detail.

FIG. 10 is a state diagram illustrating a difference in focus state and astigmatism of an electron beam by electron gun spherical aberration of the present invention. FIG.

During the operation of the present invention, since the electrons emitted through the cathode 8 are accelerated and scanned in the form of an electron beam by the control electrode 9 and the acceleration electrode 10, the same as in the conventional cathode ray tube electron gun, In operation, the electron beam scanned through the triode portion, which is the cathode 8, the control electrode 9, and the acceleration electrode 10, is focused and accelerated through the first and second acceleration electrodes 60 and 61, respectively. Explain the process.

As described above, when the electron beam is scanned to the first and second collection acceleration electrodes 60 and 61 through the triodes 8, 9, and 10, the first collection acceleration electrode 60 and the second electrode. Electrostatic fields mounted on the openings of the first and second collection acceleration electrodes 60 and 61 and the first and second collection acceleration electrodes 60 and 61 while different voltages are applied to the collection acceleration electrodes 61. An equipotential surface is formed on the control electrodes 51, 51a, 52, and 52a to form a main lens, and the electron beam is focused and accelerated by the main lens formed as described above. At the same time as passing through the electron beam through hole of the mask (4), the three primary (red, green, blue) phosphor 3 hits the phosphor 3, the screen is formed on the panel coated with the phosphor 3, wherein the first, Hereinafter, a process of focusing and accelerating the electron beam by the two acceleration electrodes 60 and 61 will be described in detail.

In the first and second collection acceleration electrodes 60 and 61, which are enlarged to a size that can be allowed to be mounted in the cathode ray tube net diameter, which is a component of the present invention, the main lens apertures 53 and 54 of the main lens aperture 53 and 54 are conventionally formed. Electrostatic field control electrodes 51 and 52 having an enlarged vertical size and an outer vertical size of the electrode, or three elliptical main lens apertures 53a having a longer length in the longitudinal direction than a conventional one are formed. The longitudinal length of the horizontal electrostatic field control electrode 51a and the main lens aperture 54a formed at the center are the same as that of the main lens aperture 53a of the horizontal electrostatic field control electrode 51a. When the enlarged, long-length, long-length electrostatic field control electrodes 52a each of which is concave in a semi-elliptical shape are mounted, and the electron beams are scanned on the first and second collection acceleration electrodes 60 and 61, respectively. And the electrostatic field control electrodes 51, 51a, 52, and 52a mounted on the home acceleration electrodes 60 and 61. The electron beam passes through the main lens apertures 53, 53a, 54, and 54a of different sizes. At this time, the electron beams have the vertically enlarged electrostatic field control electrodes 51, 51a ( The main lens apertures 53, 53a, 54, and 54a pass through the main lens apertures 53, 53a, 54, and 54a of 52 and 52a, so that the focusing force in the vertical direction is more conventional. The intensity is weakened so that the difference in the focusing force in the horizontal and vertical directions passing through the main lens apertures 53, 53a, 54, and 54a is greatly reduced, and as described above, the main lens apertures 53, 53a, 54 As shown in FIG. 10, as the difference in the focusing force in the horizontal and vertical directions of the 54a is reduced, the size of the electron beam is reduced due to the reduction of the spherical aberration, so that the desired astigmatism can be adjusted and the screen resolution is greatly improved. do.

Furthermore, the gap between the bead glass 70 between the first and second collecting acceleration electrodes 60 and 61 and the enlarged portion 62 and the gap between the other electrodes 8, 9, and 10 are increased. The electrodes 8, 9, 10, 60, and 61 are fixed to both ends of the electrodes 8, 9, 10, 60, and 61 so that the electrodes 8, 9, 10, 60, 61 are uniformly formed. The charge distribution generated between the 70 is formed evenly, thereby greatly improving the withstand voltage characteristic.

The electron gun for the color cathode ray tube according to the present invention is a first and second collecting acceleration electrode for focusing and accelerating an electron beam, an electrostatic field control electrode fixed in the first and second collecting acceleration electrodes, and an electron beam passing hole of the electrostatic field control electrode. By increasing the vertical dimension of the main lens aperture, the size of the electron beam according to the weakening of the vertical main lens intensity of the electrostatic field control electrode is reduced to achieve the desired astigmatism. By adjusting the astigmatism, the screen resolution can be greatly improved.

In addition, as the bead glass is installed such that the distance between the first and second collecting acceleration electrodes and the distance between the other electrodes are equal to each other, the electric charge distribution generated between the electrode and the bead glass is uniformly formed. There is also an excellent effect of improving the properties.

Claims (6)

A triode which emits and controls electrons according to a heat source of an inherent heater, and scans them in a beam form; and a first collecting electrode and a second, in which a main lens is formed to house and accelerate an electron beam scanned through the tripole on a screen. An electron gun for a color cathode ray tube consisting of a collecting acceleration electrode, an electrostatic field control electrode installed in the first collecting electrode and the second collecting acceleration electrode, and bead glass for fixing and holding the electrodes at predetermined intervals; In order to increase the size of the vertical hole of the electrostatic field control electrode installed in the first and second collection acceleration electrodes, the outer size of the first and second collection acceleration electrodes is larger than other electrodes. Electron gun for a color cathode ray tube, characterized in that formed. The fixed-field electrostatic field control electrode of claim 1, wherein the electrostatic field control electrode mounted in the first and second collection acceleration electrodes has three elliptical main lens apertures of which the length in the longitudinal direction is enlarged to a certain length. and; The longitudinal length of the main lens aperture formed at the center thereof is the same as that of the main lens aperture of the transverse electrostatic field control electrode, and the longitudinal length thereof is enlarged to a certain size, and the longitudinal electrostatic field is formed to be concave in a semi-elliptical shape at both ends. An electron gun for a color cathode ray tube, characterized in that the control electrode. The electron gun for a color cathode ray tube of claim 1, wherein the enlarged portion is formed in a region where the electrostatic field control electrodes are positioned from the main lens forming portion. The color cathode ray according to claim 1, wherein the bead glass has a buried portion having a predetermined size groove in a bead portion to fix the first and second collecting acceleration electrodes having an enlarged portion enlarged larger than the other electrode. Tolerance gun. The bead glass of claim 1 or 4, wherein the bead glass is fixed to both ends of the electrodes such that a gap between the first and second collecting acceleration electrode enlargement portions and a gap between the other electrodes are formed to be uniform with each other. Electron gun for color cathode ray tube, characterized in that. According to claim 1, wherein the bead glass, the same size irregularities are formed on the outer portion of the buried portion in order to prevent the occurrence of cracks in the buried portion due to the buried fixing of the first and second collecting acceleration electrode expansion portion, Electron gun for color cathode ray tube, characterized in that the overall thickness of the bead glass is uniform.