KR100768180B1 - Electron gun and color picture tube therewith - Google Patents

Abstract

According to the present invention, a cathode, a control electrode, a screen electrode, a plurality of focus electrodes, and final acceleration electrodes are arranged in sequence; An electron gun having a bead glass for fixing the cathodes and the cathodes except the screen electrode, the through-holes are formed on both sides of the control electrode, the screen electrode and one focus electrode disposed in front of the screen electrode The guide electrode is installed to be movable, the guide rod is inserted through the through hole and the screw surface is formed on the outer peripheral surface; A first spacer formed of a metal material provided on one side of the insulator, the insulator having a screw formed on an inner surface thereof and fastened to the guide rod between the control electrode and the screen electrode; And an insulator having a screw formed on an inner surface of the screen electrode and a focus electrode in front of the screen electrode, and a second spacer provided on one side of the insulator and welded to a metal material of the first spacer. There is provided an electron gun having;

Description

Electron gun and color cathode ray tube equipped with it {Electron gun and color picture tube therewith}

1 is a cross-sectional view schematically showing the configuration of a general color cathode ray tube.

2 is an exploded perspective view of the electrodes of the electron gun;

3 is an explanatory view showing separation of the electrodes of the electron gun according to the present invention in a partial cross-sectional state;

4 is a front view and a side view of the second electrode shown in FIG.

5 is an exploded perspective view of the guide rod and the nut.

6 is an exploded perspective view of the spacer;

Fig. 7 is an explanatory diagram showing a partial cross section of the electron gun in the assembled state;

<Brief Description of Major Codes in Drawings>

11. Panel 12. Shadow Mask Frame Assembly

13. Funnel 16. Electron gun

17. Deflection yoke 20. Cathode

30. Cathode mount 31. First electrode

32. Second electrode 33. Third electrode

34. Guide rod 35. Nut

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun and a color cathode ray tube having the same, and more particularly, to an electron gun capable of focus adjustment by adjusting a distance between electrodes, and a color cathode ray tube having the same.

In general, a color cathode ray tube includes a panel in which a fluorescent surface is formed inside, and a funnel in which the panel is provided on one surface, and an electron gun is installed in a neck of the funnel. The electron gun generates electron beams corresponding to red, green, and blue according to an electric signal and is scanned on the fluorescent surface of the panel to display a predetermined image.

1 is a schematic cross-sectional view of a conventional color cathode ray tube.

Referring to the drawings, the color cathode ray tube includes a shadow mask frame assembly having a panel 11 having a predetermined pattern of a fluorescent film formed on an inner surface thereof, and a shadow mask 12a mounted inside the panel and spaced apart from the fluorescent film by a predetermined distance. 12), a funnel 13 having a neck portion 13a and a cone portion 13b to be sealed to the panel 11, an electron gun 16 inserted into the neck portion 13a, and the cone portion. The deflection yoke 17 provided in the outer side of 13b is provided. The electron beam incident from the electron gun 16 is deflected by the deflection yoke 17 and passes through the hole formed in the shadow mask 12a to reach the fluorescent film on the inner surface of the panel 11. The electron beam can display an image by exciting the phosphor of the fluorescent film.                         

Shown in FIG. 2 is a schematic exploded perspective view of the electrodes of the electron gun 16 of FIG. 1, which corresponds to the electrodes of a dynamic focus electron gun, similar to that disclosed in US Patent Application No. 4,814,670.

Referring to the drawings, the electron gun includes a cathode 21 corresponding to red, green, and blue, a control electrode 21, a screen electrode 22, and a first focus electrode 23 sequentially disposed in front of the cathode 21. ), A second focus electrode 24, and a final acceleration electrode 25. The control electrode 21 and the screen electrode 22 are composed of plate-shaped electrodes as shown in the drawing, while the focus electrodes 23 and 24 and the final acceleration electrode 25 are configured as cup-shaped electrodes or assembly of cup-shaped electrodes. . In practice, these electrodes are assembled with a predetermined distance from each other by bead glass. In the example shown in the drawing, the focus voltage VF, which is a constant voltage, is applied to the first focus electrode 23, while the dynamic focus voltage VD is applied to the second focus electrode 24.

In the electron gun as described above, the electrodes are fixed to each other by embedding the buried portion in the bead glass while maintaining a predetermined interval. The spacing of the electrodes is very important in maintaining the desired quality required by the electron gun. For example, the spacing between the control electrode, the screen electrode, and the first focus electrodes is very important in determining the focus of the electron gun. However, once the filling is made, the gap between the electrodes cannot be adjusted. Therefore, if the gap between the electrodes is not accurately adjusted at the time of filling, the electron gun itself must be discarded. However, when the electrodes are embedded in the bead glass, it is not easy to accurately adjust the distance between the electrodes, and thus, once the filling is made, the adjustment is impossible.

The present invention has been made to solve the above problems, it is an object of the present invention to provide an electron gun that can adjust the distance between the electrodes after the assembly of the electron gun is made.

Another object of the present invention is to provide a color cathode ray tube having an electron gun capable of adjusting the distance between electrodes.

In order to achieve the above object, according to the present invention, a cathode, a control electrode, a screen electrode, a plurality of focus electrodes, and final acceleration electrodes are arranged in sequence; An electron gun having a bead glass for fixing the cathodes and the cathodes except the screen electrode, the through-holes are formed on both sides of the control electrode, the screen electrode and one focus electrode disposed in front of the screen electrode The guide electrode is installed to be movable, the guide rod is inserted through the through hole and the screw surface is formed on the outer peripheral surface; A first spacer formed of a metal material provided on one side of the insulator, the insulator having a screw formed on an inner surface thereof and fastened to the guide rod between the control electrode and the screen electrode; And an insulator having a screw formed on an inner surface of the screen electrode and a focus electrode in front of the screen electrode, and a second spacer provided on one side of the insulator and welded to a metal material of the first spacer. There is provided an electron gun having;                     

According to one feature of the invention, the screen electrode is the body portion is formed with the through hole; And a supporting surface contacting the upper and lower sides of the main body to support the main body up and down, and one side of the upper fusion wing and the lower fusion wing fused to the bead glass.

According to another feature of the invention, the first spacer and the second spacer can be rotated using an electromagnet after the assembly of the electron gun is completed, whereby the screen electrode is the front of the control electrode and the screen electrode The guide rod may move in the longitudinal direction between the focus electrodes positioned at.

According to another feature of the present invention, there is provided a cathode, a control electrode, a screen electrode, a plurality of focus electrodes, and final acceleration electrodes arranged in sequence; A color cathode ray tube in which an electron gun including bead glass for fixing the electrodes and the cathode except for the screen electrode is inserted into the neck portion of the funnel, wherein the control electrode, the screen electrode, and the screen electrode are disposed in front of the screen electrode. Guide rods formed on both sides of one focus electrode, and the screen electrodes are installed to be movable, and are inserted through the through holes and have a screw surface formed on an outer circumferential surface thereof; A first spacer formed of a metal material provided on one side of the insulator, the insulator having a screw formed on an inner surface thereof and fastened to the guide rod between the control electrode and the screen electrode; And an insulator having a screw formed on an inner surface of the screen electrode and a focus electrode in front of the screen electrode, and a second spacer provided on one side of the insulator and welded to a metal material of the first spacer. A color cathode ray tube having; is provided.                     

According to another feature of the invention, by rotating the first spacer and the second spacer using an electromagnet outside the neck portion, the screen electrode is between the control electrode and the focus electrode located in front of the screen electrode It can move in the longitudinal direction of the guide rod.

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

3 is a schematic explanatory view showing a part of the electron gun according to the present invention in a partial cross section.

Referring to the drawings, a cathode mounting portion 30 having a cathode installed therein, a first electrode 31, a second electrode 32, and a third electrode sequentially disposed in front of the cathode mounting portion 30; 33 is provided. While the first electrode 31 and the second electrode 32 are formed of plate-shaped electrodes, the third electrode 33 is formed by welding two cup-shaped electrodes to each other. In FIG. 3, the third electrode 33 is formed. Only one of is shown. The first electrode 31 corresponds to the control electrode described with reference to FIG. 2, the second electrode 32 corresponds to the screen electrode, and the third electrode 33 corresponds to the first focus electrode. As known in the art, electron beam through holes through which red, green, and blue electron beams can pass are formed in the electrodes. For example, in FIG. 3, an electron beam through hole 33c is formed in the third electrode 33, and corresponding electron beam through holes are also provided in the first electrode 31 and the second electrode 32.

Meanwhile, the first to third electrodes 31, 32, and 33 are formed with holes through which the guide rod 34 can be inserted. That is, the through hole 31a is formed in the first electrode 31, the through hole 31b is formed in the second electrode 32, and the through hole 33a is formed in the third electrode 33. Guide rods 34 are inserted through the through holes 33a, 33b, and 33c. Guide rod 34, as will be described in more detail later, the screw surface is formed on the outer surface, it is formed of the material of the insulator. A nut 35 is fastened to an end of the guide rod 34, and the nut 35 is disposed inside the third electrode 33 formed of two cup electrodes.

Meanwhile, the first spacer 36 and the second spacer 37 are inserted and disposed between the electrodes. The first spacer 36 is disposed between the first electrode 31 and the second electrode 32, while the second spacer 37 is disposed between the second electrode 32 and the third electrode 33. Is placed on. Screw holes are formed in the first spacer 36 and the second spacer 37 so that the guide rod 34 can be inserted therein. The first spacer 36 and the second spacer 37 are formed entirely of insulators, some of which are formed of metal, as will be described in more detail below. Further, portions formed of the metal of the first spacer 36 and the second spacer 37 are welded to each other. Therefore, when the first spacer 36 and the second spacer 37 are rotated on the outer circumferential surface of the guide rod 34, the first spacer 36 and the second spacer 37 follow the longitudinal direction of the guide rod 34. Will move. Therefore, the position of the second electrode 32 disposed between the first spacer 36 and the second spacer 37 is also changed. That is, the guide rod 34 is moved along the length, and thus, the second electrode 32 may change the position between the first electrode 31 and the third electrode 33.

4 shows an isolated front view and a side view of the second electrode described with reference to FIG. 3.

Referring to the drawings, the second electrode 32 includes a main body portion 43, an upper fusion blade 41 in a separated state disposed above and below the main body portion 43, and a lower fusion blade 42. . In the main body portion, electron beam through holes 43R, 43G, and 43B through which red, green, and blue electron beams can pass are formed, and through holes 32a and 32b through which the bolt 34 can be inserted are formed. It is formed on the left and right sides of the through holes, respectively.

On the other hand, the upper fusion wing 41 and the lower fusion wing 42 is fused to the bead glass, and supports the body portion 43 to move up and down. Support surfaces 41a and 42a are formed on the bottom of the upper fusion wing 41 and the upper surface of the lower fusion wing 42, respectively, to easily support the main body portion 43 of the second electrode 32 therebetween. can do. In addition, the width of the support surfaces 41a and 42b is a limit of the interval at which the main body 43 of the second electrode 32 can move.

5 is an exploded perspective view of a guide rod and a nut fastened to an end of the guide rod.

Referring to the drawings, the guide rod 34 and the nut 35 have the shape of a conventional bolt and nut, whereas they are preferably made of an insulator. By being made of an insulator, it excludes electrical connections between the electrodes and does not affect the focusing and divergence of the electron beam.

6 is a schematic perspective view of the first spacer and the second spacer.                     

Referring to the drawings, the overall shape of the first spacer 36 and the second spacer 37 is similar to a conventional nut, which are formed of an insulator. One side of the first spacer 36 is provided with a metal weld 36a, and one side of the second spacer 37 is provided with a metal weld 37a. The metal welds 36a and 37a are welded to each other during assembly. These metal welding parts 36a and 37a are provided to rotate the spacers 36 and 37 by using an electromagnet or the like outside the neck of the cathode ray tube after the assembly of the electron gun is completed. That is, the spacers 35 and 37 are rotated by the magnetic force, whereby the spacers 36 and 37 are movable along the longitudinal direction of the guide rod 34.

7 is an explanatory view showing a partial cross section of the electron gun according to the present invention in an assembled state.

Referring to the drawings, the cathode mounting portion 30, the first electrode 31, the second electrode 32, and the third electrode 33 are in a state of being fixed by the bead glass 70 in order. As described with reference to FIG. 4, the second electrode 32 has an upper fusion vane 41 and a lower fusion vane 42 supporting the main body portion 43. Meanwhile, the guide rod 34 is inserted into a through hole formed in the first to third electrodes 31, 32, and 33, and the nut 35 is fastened to an end of the guide rod 34. A first spacer 36 and a second spacer 37 are coupled on the guide rod 34 between the electrodes.

In the electron gun assembled as described above, even after the assembly of the electron gun is completed, the second electrode 32 as the control electrode may be adjusted between the first electrode 31 and the first focus electrode 33 as the screen electrodes. That is, although the fusion vanes of the respective electrodes are embedded in the bead glass 70 as shown in FIG. 7, the main body portion 32 of the second electrode 32 is the upper fusion vane 41 and the lower fusion vane. It is supported so that a movement is possible between each support surface 41a and 42b of 42. As shown in FIG. In addition, a guide rod 34 inserted into the through holes 31a, 32a, 33a formed at both sides of the first to third electrodes 31, 32, 33, and a first spacer coupled to the guide rod 34. The second electrode 32 can be moved using the 36 and the second spacer 37. That is, after the assembled electron gun is enclosed in the neck portion of the color cathode ray tube as shown in FIG. 1, the first spacer 36 and the second spacer 37 can be rotated using an electromagnet. Since one side of the spacers 36 and 37 is provided with a metallic material, the spacers 36 and 37 may rotate on the outer circumferential surface of the guide rod 34 by acting on the magnetic force of the electromagnet. At the time of adjustment, the spacers 36 and 37 are rotated by the required angle using an electromagnet, and the focus is measured. The spacers 36 and 37 can be rotated to a position where the focus is optimal.

The electron gun and the color cathode ray tube having the same according to the present invention can adjust the distance between the electrodes even after the assembly of the electron gun is completed, so that the focus can be freely adjusted according to the characteristics of the color cathode ray tube, and accordingly the elegance of the color cathode ray tube Has the advantage of being improved. In addition, there is an advantage that the occurrence of the defect due to the assembly error of the electron gun electrode is essentially eliminated to increase the yield.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary and can be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. There will be. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

Claims (5)

A cathode, a control electrode, a screen electrode, a plurality of focus electrodes, and final acceleration electrodes arranged in sequence; An electron gun having bead glass for fixing the electrodes and the cathode except the screen electrode, Through holes are formed on both sides of the control electrode, the screen electrode, and one focus electrode disposed in front of the screen electrode, and the screen electrodes are installed to be movable. A guide rod inserted through the through hole and having a screw surface formed on an outer circumferential surface thereof; A first spacer formed of a metal material provided on one side of the insulator, the insulator having a screw formed on an inner surface thereof and fastened to the guide rod between the control electrode and the screen electrode; And, An insulator having a screw formed on an inner surface of the screen electrode and a focus electrode in front of the screen electrode, and a second spacer provided on one side of the insulator and welded to a metal material of the first spacer; Equipped with an electron gun. The method of claim 1, The screen electrode may include a main body portion in which the through hole is formed; And a support surface contacting the body portion up and down to support the body portion up and down, and one side of which has an upper fusion wing and a lower fusion wing fused to the bead glass. The method of claim 1, The first spacer and the second spacer may be rotated using an electromagnet after assembly of the electron gun is completed, whereby the screen electrode is guided between the control electrode and a focus electrode located in front of the screen electrode. An electron gun, which is movable in the longitudinal direction of the rod. A cathode, a control electrode, a screen electrode, a plurality of focus electrodes, and final acceleration electrodes arranged in sequence; In the color cathode ray tube inserted in the neck portion of the funnel is an electron gun having a bead glass for fixing the electrodes and the cathode except the screen electrode, Through holes are formed on both sides of the control electrode, the screen electrode, and one focus electrode disposed in front of the screen electrode, and the screen electrodes are installed to be movable. A guide rod inserted through the through hole and having a screw surface formed on an outer circumferential surface thereof; A first spacer formed of a metal material provided on one side of the insulator, the insulator having a screw formed on an inner surface thereof and fastened to the guide rod between the control electrode and the screen electrode; And, An insulator having a screw formed on an inner surface of the screen electrode and a focus electrode in front of the screen electrode, and a second spacer provided on one side of the insulator and welded to a metal material of the first spacer; Color cathode ray tube provided. The method of claim 4, wherein By rotating the first spacer and the second spacer using an electromagnet outside the neck portion, the screen electrode can move in the longitudinal direction of the guide rod between the control electrode and a focus electrode located in front of the screen electrode. Color cathode ray tube, characterized in that there is.

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