KR940010843B1 - Electron gun for cathode-ray tube - Google Patents

Abstract

The gun improves the quality and color image, and prevents the heating loss. The gun includes electricity cathodes (4,4',4") which have the various heaters (3,3',3") and mosaic shape caps, a lower hermatic assembly (2) which has cathode ilets (5,5',5"), and a 1st auxiliary electrode (10) which holds the multitude of budglasses. The outer apertures (14,14') and central a aperture (13') of the 1st auxiliary electrode (10) have a cylindrical shape, and the projecting direction of the outer apertures (14,14') in directed toward the control grid (9).

Description

Electron gun for cathode ray tube

1A is a partial cross-sectional view showing a scene structure of a conventional cathode ray tube electron gun.

(b) is a side view showing a coupling relationship between the first auxiliary electrode and the mechanical assembly of a conventional cathode ray tube electron gun.

2 is a perspective view of a first auxiliary electrode of a conventional electron gun for a cathode ray tube.

3 is a graph showing the heating time and cathode current of an electron gun for a conventional cathode ray tube.

4 is a cross-sectional view showing the structure of an electron gun for a cathode ray tube of the present invention.

5 is a perspective view of a first auxiliary electrode of an electron gun for a cathode ray tube of the present invention.

Figure 6 is a graph showing the heating time and cathode current of the electron gun for the cathode ray tube of the present invention.

* Explanation of symbols for main parts of the drawings

4, 4 ', 4 ": cathode 5,5', 5": cathode eyelet

10: first auxiliary electrode 13 ': center diameter

14, 14 ': outside diameter

The present invention provides a cathode ray tube suitable for improving the white uniformity of the color receiver by maintaining the equality of the cathode current by preventing the heat loss of the outer cathode by making the outer diameter of the first auxiliary electrode cylindrical in the cathode ray tube electron gun. It's about an electron gun.

As shown in FIG. 1A, the electron gun for the cathode ray tube includes the cathodes 4, 4 ′, in which heaters 3, 3 ′, 3 ″ are inserted into the ceramic assembly 2 to which the insulating glass 1 is coupled. 4 ") is inserted into the cathode eyelets 5, 5 ', 5", and caps 6, 6', 6 "on top of each cathode 4, 4 ', 4" to form an oxide ( 7,7 ', 7 ").

In addition, the control grid 9 having the recess 8 formed with a predetermined distance away from the cathodes 4, 4 ′ and 4 ″ is coupled to the first auxiliary electrode 10 at regular intervals from the control grid 9. The screen grid 12 in which the block portion 11 is formed is fixed, and the first auxiliary electrode 10 is provided with holes 13 so that the cathode eyelets 5, 5 ', 5 "are fitted as shown in FIG. , 13 ', 13 ") are formed.

As described above with reference to FIG. 1B in the assembly of the electron gun employing the Hammatic assembly as follows.

That is, in the beam process of the electron gun, a spacer (not shown) is inserted between the electrodes to maintain a predetermined distance therebetween, followed by heating a bead glass and then fusion bonding the electrodes and the first auxiliary electrode 10. After removing the spacer, the electrode assembly is completed, and the hammatic assembly 2 is inserted into the leg of the first auxiliary electrode 10 and then welded (21, 21 ') to fix the cathode eyelet (5). The cathode 4 is inserted into the control grid 9 to maintain a constant distance from the control grid 9, and then welded 21 and 21 'to obtain the cathode cutoff voltage EKCO.

In this way, the first auxiliary electrode 10 holds the mechanical assembly 2 to maintain a constant distance from the control grid 9.

The conventional electron gun for the cathode ray tube configured as described above is disposed on the cathode 4, 4 ', 4 "when the cathode spheres constituting the cathodes 4, 4', 4" are warmed up as shown in FIG. The spacing between the control grid 9 and the screen grid 12 located differently did not maintain the desired cathode equivalence.

Thus, when the cathode spheres were heated, the central cathode 4 'was operated at a temperature higher than the temperature of the other outer cathodes 4, 4 ".

That is, due to the temperature rise during heating of the cathode sphere, the expansion amount of the outer cathode 4,4 "is larger than the arrow direction A, C, and the expansion amount of the central cathode 4 'is larger than the arrow direction B. The equivalence of the cathode current is not maintained as in FIG.

Therefore, in the conventional cathode ray tube electron gun, the central cathode 4 'is made higher by the radiation of heat generated from the outer cathode 4,4 "so that the outer cathode 4,4" is directed toward the neck of the water pipe. There was a problem that it is difficult to obtain a standard white image due to the cathode (4,4 ', 4 ") temperature distribution difference because the heat loss, etc. is lowered.

In order to solve the conventional problems, the present invention protrudes the outer diameter of the first auxiliary electrode into a cylindrical shape to prevent heat loss generated from the outer cathode, thereby changing the initial gap between the cathode and the control grid so that the cathode is constant. The purpose of the present invention is to improve white uniformity by obtaining a current. The configuration and effect of the present invention will be described with reference to the accompanying drawings.

First, the configuration of the electron gun for the cathode ray tube of the present invention, as shown in FIG. 4, the heaters 3, 3 ', 3 "inserted into the ceramic assembly 2 to which the insulating glass 1 is coupled ( 4, 4 ', 4 "are inserted into the cathode eyelets 5, 5', 5", and the recesses 8 are formed at a predetermined distance from the cathodes 4, 4 ', 4 ". The control grid 9 is coupled to the first auxiliary electrode 10 and the screen grid 12 on which the block portion 11 is formed is fixed to the control grid 9 at a predetermined interval, and the first auxiliary electrode 10 is formed of a first auxiliary electrode 10. As shown in FIG. 5, the center pore 13 'is the same as the conventional one so that the cathode eyelets 5, 5', 5 "are fitted, and the outer pore 14, 14 'is configured to protrude in a cylindrical shape.

The effect of the electron gun for the cathode ray tube of the present invention configured as described above is as shown in FIG. 10. The cylindrically protruding outer cavity 14,14 'is fitted so as to completely surround the cathode 4,4 ", preventing the external heat loss when the cathode sphere is heated, thereby reducing the cathode 4,4'. 4 ") is made uniform as shown in FIG.

As described above, the cylindrical external pore formed in the first auxiliary electrode prevents heat loss generated in the external cathode, so that the matching time of each cathode current can be shortened, so that the equality of the cathode current can be easily obtained. It is possible to improve the white uniformity such as color water pipes to make the image excellent, thereby improving the quality of the product.

Claims (2)

The conventional cathode, which houses each heater and has a cap on the top, holds the electric cathode from the bottom, and insulates the cathode eyelet and the cathode eyelet. In an electron gun having a first auxiliary electrode holding a matic assembly in a plurality of bird glasses, the outer diameters 14 and 14 'of the first auxiliary electrode 10 are cylindrically different from the central pore 13'. Electron gun for cathode ray tube, characterized in that configured to protrude. The electron gun for cathode ray tube according to claim 1, wherein the protruding direction of the outer diameters (14, 14 ') is configured to protrude toward the control grid (9) side.