KR920005234Y1 - One-body type electrode of crt - Google Patents

Abstract

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Description

Integral electrode of electron gun for cathode ray tube

1 is a longitudinal cross-sectional view of a conventional electron gun.

2 is a longitudinal cross-sectional view of the electron gun according to the present invention.

3 is an enlarged cross-sectional view showing main parts in which the third electrode and the fourth electrode are integrally combined with respect to part A of FIG.

4 is a perspective view of an insulated electrode applied to the present invention.

* Explanation of symbols for main parts of the drawings

1: first electrode 2: second electrode

3: third electrode 4: fourth electrode

5: lens support 6: bead glass

7: Insulation electrode 8,8 ': Fixed iron piece

9: home

The present invention relates to an electrode of an electron gun for a cathode ray tube, and in particular, a ceramic insulator having a predetermined thickness is integrally formed between a fourth electrode to which a high voltage is applied and a third electrode to form a main focus voltage, thereby mutual thermal deformation. The present invention relates to an integrated electrode structure of an electron gun for cathode ray tubes, which prevents and improves intergranular characteristics and electron beam characteristics of an electron gun.

In general, an electron gun is a device in which a cathode, which receives heat from a heater, emits hot electrons to form an electron beam by controlling, accelerating, and connecting the electrons again. A fourth grid 4 (or G4 electrode: hereinafter referred to as a fourth electrode) that connects an electron beam by applying a high voltage to the first grid 1 (or G1 electrode: hereinafter referred to as a first electrode) to control hot electrons. It adheres in the state arranged in a line until it is fixed to the bead glass 6 which is an electrical insulator.

In such a conventional electron gun, the fourth electrode 4 to which a high voltage (about 25 Kv) is applied and the third electrode 3 to form a main focus voltage are connected to an exact point of the electron beam to focus the hot electron emission of the cathode. It is assembled with a predetermined interval spaced apart, the predetermined interval is controlled to accelerate and accelerate the electron beam emitted from the cathode by the first electrode and the pre-focus, and then the flow of particles to send to the fluorescent surface a very narrow one point It will be responsible for focusing from the main focus to narrow it down.

In the conventional electron gun having such a structure, each of the electrodes 1 to 4 is separately separated before being buried in the bead glass 6, and after assembly, separately assembled parts, and then bead glass It was completed by assembling in (6) through a double process.

However, this method maintains a separate interval between the fourth electrode 4 to which a high voltage is applied during assembly of the electron gun and the third electrode 3 forming the main focus voltage so as to maintain a predetermined interval for intergranularity. It takes a long time to assemble and maintains the gap between the electrodes by going through the process of inserting the spacer and by performing another gap measuring process to see if the correct predetermined interval is maintained between the electrodes. Spacer also has a number of problems, such as easy change in thermal deformation, such as the electron beam characteristics of the electron gun is inferior.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and the purpose is to integrally assemble a predetermined interval between the fourth electrode to which the high voltage is applied and the third electrode to form the main beam. It is possible to achieve efficiency in assembling the electron gun without inserting a separate space keeping spacer, or to perform the gap measurement process and electrode management, and to improve the breakdown voltage characteristics so that it does not change at all due to thermal deformation due to high voltage. An integrated electrode of an electron gun is provided.

In order to achieve the above object, the integrated electrodes of the electron tube for cathode ray tube according to the present invention are arranged in a row from the first electrode to the fourth electrode and buried in the bead glass, which is an electrical insulator, in which the high voltage is applied. An insulating electrode having a thickness of a predetermined interval is inserted between the fourth electrode and the third electrode forming the main focus voltage, and the insulating electrode maintains a predetermined distance between the third electrode and the fourth electrode. A plurality of grooves are formed for connection between them, and each of the grooves of the insulated electrode is fitted with a plurality of fixing iron pieces so as not to be separated from each other. The electrode is characterized in that it is made to be fixed integrally.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention.

FIG. 2 is a longitudinal cross-sectional view of the electron gun according to the present disclosure. FIG. 3 is an enlarged cross-sectional view of main parts of the third electrode and the fourth electrode integrally coupled to the line A-A 'of FIG. 2, and FIG. It is a perspective view of the insulated electrode applied to this invention.

In FIG. 3, reference numeral 3 denotes a third electrode forming a main focus voltage, reference numeral 4 denotes a fourth electrode to which a high voltage is applied, and reference numeral 8, 8 'denotes an insulating electrode 7. The third electrode 3 and the fourth electrode 4 support each other A fixed iron piece having a magnetic shape, and (7) is an insulating electrode shown in FIG. 4 and has a thickness equal to a predetermined interval for maintaining a predetermined interval between the third electrode 3 and the fourth electrode 4.

In addition, the insulating electrode 7 is made of a ceramic material having a high dielectric strength to withstand high high pressure sufficiently.

The thickness of the insulating electrode 7 by a predetermined interval insulates between the third electrode 3 and the fourth electrode 4, and also prevents thermal deformation of the third electrode 3 and the fourth electrode 4. The pressure resistance characteristics are taken into consideration so as to sufficiently prevent them.

In the insulating electrode 7 made of ceramic material, several grooves 9 are formed to integrally fix the third electrode 3 and the fourth electrode 4, and each of the grooves 9 is fixed. Iron piece (8) is made of a structure that is engaged so that it is not easily separated.

Such an insulating electrode 7 of ceramic material is first inserted between the third electrode 3 and the fourth electrode 4 during assembly, and then inserted into the grooves 9 formed on both sides of the insulating electrode 7. Of the number corresponding to this groove (9) One side of the stationary iron pieces 8 and 8 'having a magnetic shape is fitted, and the other side of the stationary iron pieces 8 and 8' is in close contact with the outside of the third electrode 3 and the fourth electrode 4, respectively. Then, the third electrode 3 and the fourth electrode 4 are integrally fixed by welding or ultrasonic welding.

When high pressure is applied to the third and fourth electrodes 3 and 4 that are integrally assembled by such an assembly method, the dielectric strength due to the intrinsic resistance of the insulating electrode 7 is strengthened, and the withstand voltage characteristics thereof are constant. This prevents thermal deformation between electrodes.

According to the integrated electrode of the cathode ray tube electron gun of the present invention as described above, by fixing the third electrode and the fourth electrode integrally by the insulating electrode and the fixing iron piece, it is possible to shorten the work process and increase the performance during assembly. In addition, it is possible to prevent the thermal deformation between the electrodes by maintaining the precise interval between the electrodes by the insulating electrode having a high dielectric strength, and also has a very excellent effect such that the life span and electron beam characteristics of the electron gun is significantly improved.

Claims (2)

In the electron gun arranged in a row from the first electrode 1 to the fourth electrode 4 and fixed to the bead glass 6, which is an electrical insulator, the fourth electrode 4 to which a high voltage is applied; The insulating electrode 7 having a predetermined thickness is inserted between the third electrodes 3 forming the main focus voltage, and the insulating electrode 7 is formed of the third electrode 4 and the fourth electrode 4. And a plurality of grooves 9 for maintaining a predetermined gap between the plurality of grooves 9 and connecting them to each other, and each of the grooves 9 of the insulating electrode 7 has a third electrode 3 and a fourth electrode 4. An integrated electrode of an electron gun for a cathode ray tube, characterized in that the () is integrally formed. 2. The cathode electrode tube according to claim 1, wherein the insulating electrode (7) is made of a ceramic material having a high dielectric strength that can withstand high pressures while preventing thermal deformation between the third electrode (3) and the fourth electrode (4). Electrode of electron gun.