KR20030089958A - An Electric Gun For The C-CRT - Google Patents

Abstract

PURPOSE: An electron gun for color cathode ray tube is provided to improve a lowering phenomenon of a focus characteristic and the unbalance of an electric characteristic by restraining the thermal variation of each element such as a cathode support tube and the first electrode due to the heat of the cathodes. CONSTITUTION: An electron gun for color cathode ray tube includes three cathodes(201), the first electrode(105), and the second electrode(106). The cathodes(201) are used for emitting the electron beam to a phosphor screen. The first electrode(105) and the second electrode(106) are used for focusing and accelerating the electron beam. In the cathodes(201), a cylindrical sleeve is fixed by an insulating material(104-2). A heater(201-1) is inserted into the cylindrical sleeve. The cathodes(201) are formed with only one component or three components.

Description

Electron gun for color cathode ray tube {An Electric Gun For The C-CRT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun for a cathode ray tube, and more particularly to an electron gun for a cathode ray tube, which improves the focus characteristic of a cathode ray tube by improving the structure of a cathode and an anode support of an electron gun.

As shown in FIG. 1, the conventional colored cathode ray tube structure includes a front glass called panel 1 and a rear glass called funnel 2, and a fluorescent surface having a predetermined light emitting role therein, and the fluorescent surface. With an electron gun (8) for emitting an electron beam (11) for emitting light, a shadow mask (3) serving as color screening, a frame (4), a stud pin (6), and a spring (5) for welding and fixing the shadow mask. It is composed. In addition, the inner shield 7 which serves to shield the cathode ray tube so as to be less affected by external geomagnetism during operation is fixed to the frame 4 and is sealed with high vacuum.

The general principle of cathode ray tube operation is as follows. In the electron gun 8 embedded in the neck of the funnel 2, the electron beam 11 strikes the fluorescent surface formed on the inner surface of the panel 1 by the anode voltage applied to the cathode ray tube, and the electron beam reaches the fluorescent surface. Before the deflection yoke (9) is deflected up, down, left and right to form a screen. And there is a magnet to correct the trajectory so that the electron beam hits the phosphor accurately, thereby preventing poor color purity. In addition, since the cathode ray tube is made of high vacuum, it may be easily deflated due to external impact. To prevent this, the reinforcing band 10 is mounted on the skirt portion of the panel to disperse the stress of the cathode ray tube in a high vacuum state, thereby improving impact resistance. Secure.

Referring to the configuration of the electron gun in detail with reference to the drawings, as shown in Figure 2, the cathode 103 for generating an electron beam, the first electrode 105 which is spaced apart from the cathode by a predetermined distance, and a predetermined distance from the first electrode The second electrode 106, the third electrode 107, and the fourth electrode 108 arranged in the first and second electrodes 109 and sixth electrode 110 spaced apart from the fourth electrode by a predetermined distance; And a shield cup 111 attached to the sixth electrode end to shield the leakage magnetic field and a BSC supporting the electron gun. Each of the electrodes is fixed by the bead glass while maintaining a constant interval, the electron gun is inserted into the neck glass constituting the neck portion of the funnel (2) and the neck glass is fused with the stem portion for applying a voltage from the outside to the electron gun And mounted on the cathode ray tube.

Referring to the operation of the electron gun, a heater built in the cathode 103 emits electrons by heating the cathode with a voltage applied to the stem pin, and the emitted electrons are controlled by the first electrode 105 as a control electrode. The electron beam is controlled, and the electron beam is accelerated by the second electrode 106 which is the acceleration electrode, and the electron beam is formed by the UPF lens formed between the third electrode 107, the fourth electrode 108, and the fifth electrode 109. Partially focused, the electron beam is mainly connected and accelerated by the fifth electrode 109 and the sixth electrode 110 and passes through the shadow mask 3 installed on the inner surface of the fluorescent surface to impinge on the fluorescent surface to emit light. In addition, the electron beam 11 emitted from the electron gun is deflected to the entire screen by the deflection yoke 9 mounted to the outside of the electron gun, thereby realizing a screen.

3A and 3B illustrate a structure of a cathode support 104 and a triode of a conventional electron gun. As shown in FIG. 3, the cathode 103 is inserted into a cylindrical cathode support tube 104-1 to form a first electrode 105. ) Is welded to maintain a constant distance (k), the cathode support 104 is a predetermined interval (p) by the crystallized glass 104-2, the three cathode support tubes (104-1) is an insulating material And a Hermetic Supporter (104-3) for fixing.

The cathode 103 used for the cathode ray tube electron gun having the above configuration uses hot electrons, and the temperature of the hot electrons is about 800 ° C. When a current flows through the heater 102 inserted into the cathode, the temperature rises, and the temperature is transmitted to the cathode 103 by radiation. The heat transferred to the cathode is transferred to the cathode support 104 and the first electrode 105 through conduction and radiation, and the heat transferred to the cathode support 104 and the first electrode 105 is again a second electrode. Delivered to 106. As described above, the first electrode 105, the second electrode 106, the third electrode 107 and the cathode 103, and the cathode support 104 reach a predetermined temperature by heat transferred by conduction and radiation. The rise in temperature causes each part of the gun to undergo thermal expansion. Among these, thermal expansion of the cathode 103 occurs instantaneously and expands toward the first electrode 105, and the second electrode 106 expands toward the first electrode 105, after applying a voltage to the heater 110. After about 15 minutes it is thermally stable.

However, in the conventional cathode 103 having the structure as described above, the temperature of the cathode support 104 and the first electrode 105 increases very much as the temperature of the cathode 103 rises, and thus the first electrode The thermal expansion of 105 is accelerated to change the distance k between the first electrode 105 and the cathode 103, which determines the focus and electrical characteristics of the cathode ray tube.

In addition, the conventional negative electrode support 104 is assembled with a plurality of electrodes while maintaining a predetermined distance (k) with a plurality of electrodes in the beading process of the assembly of the electron gun, and then three negative electrodes 103 are inserted into the three cathode support tubes 104-1 in the cathode support 104, and are welded while maintaining a predetermined distance k with the first electrode 105. By the way, the conventional negative electrode support 104 having the structure as described above is not only complicated assembly work, but the case of the negative electrode support tube (104-1) because of the use of a metal material resistant to thermal deformation high production cost unit There is this.

Accordingly, an object of the present invention is to solve the above problems, and in particular, to improve the focus characteristics of a cathode ray tube by improving the structure of a cathode and an anode support of an electron gun, and to provide an electron gun for a cathode ray tube having a low production cost.

1 is a structural diagram of a typical cathode ray tube

2 is a structural diagram of a conventional electron gun

Figure 3a is a structural diagram of a conventional negative electrode support

3B is a structural diagram of a triode in a conventional electron gun

4A illustrates an embodiment of the present invention.

Figure 4b is a view showing another embodiment of the present invention

5 is an electron gun structure diagram of the present invention

*** Explanation of symbols for the main parts of the drawing ***

103: cathode 104: cathode support

104-1: cathode support tube 104-2: crystallized glass

104-3: hermetic supporter 105: first electrode

106: second electrode 201: cathode

301: cathode support

The technical means of the present invention for achieving this object is in the electron gun for a color cathode ray tube comprising three cathodes for emitting an electron beam toward the phosphor screen and a plurality of electrodes for focusing and accelerating the electron beam, the cathode is a heater The inserted sleeve is fixed by an insulating material.

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

As described above, the conventional negative electrode support 104 is formed of a metal component at a predetermined interval (p) in an insulating material 104-2 such as crystallized glass by a metal-based Hermetic Supporter (104-3). The negative electrode support 104 is completed by applying high temperature heat while the two negative electrode support tubes 104-1 are inserted.

However, in the present invention, as shown in FIG. 4A, three cathodes 201 are directly supported and fixed by an insulating material 104-2, such as crystallized glass, without the cathode support tube 104-1. That is, the cathode 201 of the present invention covers the upper end of the cylindrical sleeve 201-32 in which the cathode heating heater 201-1 is inserted, and covers the base metal 201-4 with nickel as a main component and a small amount of reducing elements. The holder 201-2 is welded to the lower end of the sleeve to support the sleeve, and an electron emitting material layer 201-5 made of alkaline earth metal carbonate is formed on the upper surface of the base metal.

The negative electrode support 301 of the present invention configured as described above fixes the negative electrode 201 through the supporter 202 by assembling the supporters 202 to the two bead glasses 112 without the conventional beading work as shown in FIG. 5. do. At this time, since the supporter 202 need not be precisely assembled, there is an effect of improving workability.

In addition, the cathode 201 of the present invention is a process of assembling the conventional cathode 103 while maintaining a predetermined distance k from the first electrode 105 in the first electrode 105 during span set work. The distance between the electron beam passing hole (b) and the cathode 201-1 located in the center of the three electron beam passing holes (a, b, c) and the three cathodes 201 are assembled. Therefore, the spanset operation, which has been conventionally performed three times, can be reduced to one time, thereby reducing the work time.

FIG. 4B illustrates another embodiment of the present invention in which the sleeve, the base metal, and the holder are formed as a single part 201-6 at a cathode formed of the heater, the cylindrical sleeve, the base metal, the holder, and the electron emitting material layer. The cathode 201 having such a structure is simple in operation because it does not require a process of covering the base metal on the upper end of the sleeve after welding by inserting and fastening the sleeve into the holder as in the prior art.

As described above, the present invention suppresses the thermal change of the cathode support tube and the first electrode and its surrounding components by the heat generated from the three cathodes in the conventional cathode support, thereby reducing the gap between the cathode, the first electrode, and the second electrode. It is possible to improve the unbalance of the focus characteristic defect and the electrical characteristics due to the change of the interval, and to improve the assembly dispersion between the intervals of the three cathodes and the first electrode, thereby improving the characteristic distribution between the three electron beams.

In addition, the material cost of the electron gun can be reduced by eliminating the three cathode support tubes which used expensive metal materials by integrating the cathode and the cathode support, and by improving the electron gun alignment defect due to poor work by simplifying the assembly process. Manufacturing cost can be reduced.

Claims (3)

An electron gun for a color cathode ray tube comprising three cathodes for emitting an electron beam toward a phosphor screen, and a plurality of electrodes for focusing and accelerating the electron beam. The cathode is a gun for a color cathode ray tube, characterized in that the sleeve in which the heater is inserted is fixed by an insulating material. The method of claim 1, Electron gun for color cathode ray tube, characterized in that the cathode is composed of a single component. The method of claim 1, Electron gun for color cathode ray tube, characterized in that the cathode is composed of three parts.