KR20010054762A - Cathode structure of electron gun for cathode ray tube - Google Patents

Abstract

PURPOSE: A cathode structure of an electron gun for a color braun tube is provided to be capable of improving the focus characteristics as well as simplifying the fabrication process and enhancing the accuracy in assembling by fixing the distance between an electron emission layer and a first electrode. CONSTITUTION: The cathode structure comprises an electron emission layer(301), first base metal(302) for supporting the electron emission layer(301), a heater(303) for the material(301), a sleeve(304) for protecting the heater and transferring heat to the first base metal(302), and a holder(305) for supporting the sleeve. Preferably, second base metal(306) is installed on periphery of the first base metal(302) for fixing the distance between the electron emission layer(301) and a first electrode of the electron gun. The height difference between the second base metal(306) and the electron emission layer(301) is preferably set by a.

Description

Cathode structure of electron gun for color CRT tube

The present invention relates to a cathode structure of an electron gun for a color CRT tube, and in particular, to minimize a focus characteristic defect due to heat generation of a cathode, and for a color CRT tube capable of preventing degradation of electrical characteristics due to a thermal change of a three pole portion of the electron gun. A cathode structure of an electron gun.

Figure 1 shows the structure of a typical color CRT electron gun.

Referring to FIG. 1, a general color CRT electron gun includes a stem 101 to which a voltage is applied, a cathode 102 for emitting electrons, a cathode support 103 for supporting the cathode, and a cathode in the cathode. First electrode 104, second electrode 105, third electrode 106, fourth electrode 107, fifth electrode 108, and sixth to control / accelerate the emitted electrons and form a lens It is composed of a bead glass 110 for maintaining the distance between the electrode 109 and their positions.

The operation of the color CRT electron gun having the above configuration will be briefly described.

First, when a voltage is supplied to the stem 101, heat is applied to the cathode 102, and electrons are emitted from the cathode 102 to which the heat is applied. The emitted electrons are controlled by the first electrode 104 and the second electrode 105, and are partially focused and accelerated by the third electrode 106 and the fourth electrode 107, and the electrons continue to be focused ( The main focusing / acceleration is achieved by the fifth electrode 108 which is a lens forming electrode called a focus electrode and the sixth electrode 109 which is an anode electrode.

The structure and operation of the cathode of the conventional color CRT electron gun will be described with reference to FIG. 2.

2 is an assembled state diagram of a conventional cathode for a color CRT and a first electrode.

Referring to FIG. 2, the structure of the cathode 102 of the conventional electron tube for color CRT includes an electron emitting material 201 for emitting electrons and a base metal 202 for supporting the electron emitting material 201. And a heater 203 for heating the electrospinning material 201 and a sleeve for protecting the heater 203 and transferring heat energy generated from the heater 203 to the base metal 202. 204 and a holder 205 for supporting the sleeve 204. In addition, the holder 205 is welded to the cathode support tube 206 and the bottom thereof to support the cathode 102.

When the cathode of the color CRT tube is first applied to the heater 203, the cathode absorbs heat from the sleeve 203 and transfers the heat to the base metal 202. The heat energy transferred to the gas metal 202 is transferred to the electron emission material 201, and the electron emission material 201 emits electrons by the heat energy.

On the other hand, in an electron gun for a color CRT, the distance a between the electron emitting material 201 of the cathode 102 and the hole peripheral surface 104b of the cathode side of the first electrode 104 is very important. However, when the cathode receives thermal energy from the heater 203 during its operation, the distance a between the electron-emitting material and the first electrode is changed by thermal expansion.

In addition, in the conventional manufacturing process of the cathode of the electron tube for color CRT, the first electrode hole 104a is disposed on the side of the second electrode 105 in order to keep the distance a between the electron-emitting material and the first electrode constant. The air pressure is blown through a fine nozzle into the inside of the c), and the pressure is converted into a distance to maintain a constant distance for welding. Therefore, the cathode of the conventional color CRT electron gun has a problem in that the quality of the cathode is changed according to the precision of the system for converting air pressure into distance and the size of the first electrode hole 104a becomes smaller. Since the degree of processing of the nozzle inserted into the hole 104a is limited, it is difficult to secure a necessary distance between the cathode 102 and the first electrode 104, thereby deteriorating the focus characteristic.

The present invention has been made to solve the above problems, by fixing the distance between the electrospinning material and the first electrode, it is possible to minimize the failure of focus characteristics, to facilitate the manufacturing process, and to improve the precision of assembly It is an object of the present invention to provide a cathode structure of a color CRT electron gun that can be increased.

1 is a schematic view of the structure of an electron gun for a general color CRT.

2 is an assembled state diagram of a cathode and a first electrode of a conventional electron tube for color CRT.

3 is a structural diagram of a cathode of an electron gun for a color CRT tube according to the present invention;

Figure 4 is an assembled state of the cathode and the first electrode of the electron tube for color CRT according to the present invention.

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

101 ... Stem 102 ... Cathode

103 ... cathode support 104 ... first electrode

104a ... first electrode hole 104b ... around the first electrode hole

105 ... second electrode 106 ... third electrode

107 ... fourth electrode 108 ... fifth electrode

109 Sixth electrode 110 Bead glass

201, 301 Electromagnetic Emissions 202 Gas Metals

203, 303 ... heater 204, 304 ... sleeve

205, 305 holder holder 206 cathode support tube

302 ... First Gas Metal 306 ... Second Gas Metal

307 ... cathode support tube

a ... the distance between the cathode and the first electrode

In order to achieve the above object, the cathode structure of the electron tube for a color CRT according to the present invention, an electron emitting material for emitting electrons, a first gas metal for supporting the electron emitting material, and the electron emitting material A second gas metal disposed around the first gas metal to fix the distance between the first electrode of the electron gun and the top surface of the second gas metal and the electron emitting material having a height difference by a predetermined distance; And a heater for heating the material, a sleeve for protecting the heater and transferring heat energy generated from the heater to the first gas metal, and a holder for supporting the sleeve.

Here, it is preferable that the first electrode and the second gas metal are assembled in contact with each other, and the shape of the second gas metal is cylindrical and surrounds the cathodes of R, G and B, respectively.

In the present invention, by fixing the distance between the cathode and the first electrode of the electron gun, it is possible to minimize the failure of the focus characteristics, and to facilitate the assembly work, the second base metal is R, G, B It surrounds around the cathode to block the heat generated from each cathode, there is an advantage that can be prevented from deteriorating the electrical characteristics of the triode due to thermal changes.

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

3 and 4 is a view showing the structure of the cathode of the electron tube for color CRT tube according to the present invention, Figure 3 is a structural diagram of the cathode of the electron gun for color CRT tube according to the present invention, Figure 4 is for the color CRT tube according to the present invention It is a state diagram of assembling the cathode of the electron gun and the first electrode.

3 and 4, the cathode structure of the electron tube for color CRT according to the present invention includes an electron emitting material 301 for emitting electrons, and a first gas metal for supporting the electron emitting material 301. 302, a heater 303 for heating the electrospinning material 301, and protecting the heater 303 while transferring thermal energy generated from the heater 303 to the first gas metal 302. And a holder 305 for supporting the sleeve 304.

This configuration is not different from the prior art, the cathode 102 structure of the present invention is the first gas metal 302 to fix the distance between the electron-emitting material 301 and the first electrode 104 of the electron gun The upper surface of the second gas metal 306 and the electron emitting material 301 are installed around the second gas metal 306 is characterized in that the difference by a height.

Here, in the present embodiment, it is preferable that the shape of the second gas metal 306 is cylindrical.

At this time, the cathode 102 and the first electrode 104 are assembled, as shown in FIG. 4, on the upper end surface of the second gas metal 306 and the cathode peripheral surface of the first electrode 104. In a state where 104b is in contact with each other, the cathode support tube 307 and the holder 305 are welded and assembled.

By assembling the negative electrode in the above structure, the distance between the negative electrode 102 and the first electrode 104, which is very important for securing focus characteristics, is fixed, and the negative electrode 102 and the negative electrode due to thermal expansion due to heat generation of the negative electrode 102 are fixed. The distance change between the first electrode 104 may be eliminated, and the distance may be maintained as a distance to minimize the focus characteristic defect due to the change of the distance between the cathode 102 and the first electrode 104.

In addition, in the conventional cathode assembly method, as the quality of the product changes according to a system for converting air pressure into distance, and the diameter of the first electrode hole 104a is smaller, the required cathode 102 and the first electrode 104 are required. While it is difficult to secure the distance between the electrodes, the method of assembling the cathode 102 according to the present invention differs from the electron emitting material 301 by a certain height (a) around the electron emitting material 301 of the cathode 102. By installing the second gaseous metal 306 and welding the cathode support tube 307 and the holder 305, it is possible to precisely secure the distance between the required cathode 102 and the first electrode 104. .

On the other hand, the second gas metal 306 of the present invention may be formed of a shape other than a cylindrical shape, for example, a plurality of rods can fix the distance between the second gas metal 306 and the first electrode 104.

However, in the cathode structure of the electron tube for color CRT according to the present invention, by forming the cylindrical shape, a second gas metal 306 made of an insulating material surrounds each of the R, G, and B cathodes, and is generated from the cathode. The electrical characteristics of the three-pole portion consisting of the first electrode 104, the second electrode 105, and the third electrode 106 of the electron gun are blocked by blocking heat from being transmitted between R, G, and B. Can be prevented from deteriorating. Therefore, the second gas metal 306 is preferably formed in a cylindrical shape.

As described above, according to the cathode structure of the electron tube for a color CRT according to the present invention, a second gaseous metal spaced apart by a predetermined distance between the first electrode and the electron-emitting material around the electron-emitting material of the cathode is focused, The distance between the cathode and the first electrode, which is very important for securing the characteristics, is fixed to minimize focus defects, and the distance between the cathode and the first electrode can be secured as precisely as necessary, and the assembling work is easier. It can be done.

In addition, since the second base metal is surrounded around the cathodes of R, G, and B, it is effective to block heat generated from the cathodes, thereby preventing the deterioration of electrical characteristics due to the thermal change of the three poles of the electron gun. There is an advantage.

Claims (3)

Electron emitting materials for emitting electrons; A first gas metal for supporting the electron emitting material; A second gas metal disposed around the first gas metal to fix the distance between the electron emitting material and the first electrode of the electron gun, wherein the top surface of the second gas metal and the electron emitting material have a height difference by a predetermined distance; A heater for heating the electrospinning material; A sleeve for protecting the heater and transferring heat energy generated from the heater to the first gas metal; And Cathode structure of the electron gun for color tube, characterized in that it comprises a holder for supporting the sleeve. The method of claim 1, The cathode structure of the electron gun for a color CRT tube, characterized in that the first electrode and the second gas metal is assembled in contact with each other. The method according to claim 1 or 2, The negative electrode structure of the electron gun for a color CRT tube, wherein the shape of the second gas metal is cylindrical and surrounds the negative electrodes of R, G, and B.