KR100300309B1 - Electron gun of cathode ray tube - Google Patents

Abstract

PURPOSE: An electron gun of a cathode ray tube is provided to simplify a configuration, and easily facilitate a mounting operation, and improve a through-put by installing a large caliber common electrode. CONSTITUTION: A triode(210) includes three cathodes(K), first and second grid electrodes(G1,G2). Each of the three cathodes(K) generates an electron. A main lens section(211) includes third, fourth, and fifth grid electrodes(G3,G4,G5) for intersecting and focusing three electron beams from the triode(210). A convergence lens section(212) includes sixth and seventh grid electrodes(G5,G6) for deflecting side electron beams radiated by the main lens section(211). A step pin(31) is connected to the sixth grid electrode(G6). A sealed cup(33) is formed at a front surface of the sixth grid electrode(G6) which has three electron beam through holes. A contact spring(35) is electrically connected to an anode button. A high voltage of an anode is supplied to the sixth grid electrode(G6). A large caliber electronic lens(L1) is formed at the convergence lens(212) between the fifth and sixth grid electrodes(G5,G6).

Description

Electron gun of cathode ray tube

1 is a partial cross-sectional view showing a cathode ray tube according to the present invention.

2 is an optical diagram showing an electron beam state of a convergence lens unit according to the present invention.

3 and 4 are cross-sectional views showing a convergence lens unit according to another embodiment of the present invention.

5 is a conceptual diagram showing a conventionally known electron gun.

[Industrial use]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun of a cathode ray tube, and more particularly, to an inline array electron gun that connects three electron beams as a common large-diameter lens and converges on a screen.

[Prior art]

As is known, as the cathode ray tube becomes colored, an in-line arrangement structure is proposed in which an electron gun accelerates and focuses three electron beams through a plurality of electrodes, converges them, and lands them on corresponding R, G, and B phosphors of the screen. .

However, in the color receiving tube, the distance between the electron gun and the phosphor screen is increased so that the optical magnification of the electron lens is increased, resulting in a problem that the beam spot diameter is increased and the resolution is decreased.

In order to overcome this problem, conventionally, in order to improve the performance of the lens, a large diameter lens is formed by increasing the diameter of the open hole of the electrode, or a long-focused lens is formed by lengthening the distance between the electrodes.

However, the above-described inline array electron gun has a grid electrode constituting the lens, each having three through holes, which limits the large diameter of the lens. Moreover, although the diameter of a neck may be formed large in order to implement such a large diameter, this is achieved by connecting the outer deflection plate to the increase of the power of a deflection yoke, and the low pressure dropped about 1 kV through a resistor.

However, according to the above method, in order to apply different voltages to the deflection plate, an additional resistor must be provided and the structure of the deflection plate is complicated.

Further, Japanese Patent Application Laid-Open Nos. 63-106051 and 63-106052 propose an electron gun provided with a voltage application device for applying different voltages to the above-mentioned flat plate.

However, the electron gun still has a deflection plate having a complicated structure, which requires a high level of technology for fusion of approximately four plate-like structures when mounted, and is accompanied with the fear of electrode deformation during welding.

In addition, the cathode ray tube equipped with the electron gun has a complex connection structure such as providing a plurality of voltage supply pins corresponding to the deflection plate in the anode button or installing a plurality of lead wires connected from the anode button.

In order to solve this problem, an object of the present invention is to install a common large diameter electrode in place of the deflection plate having a complex structure, simplifying the structure and easy to mount, as well as substantially improve the performance of the product. To provide an electron gun of a cathode ray tube.

In addition, the present invention has another object to drive the common large-diameter electrode, that is, the convergence electrode at a low voltage lower than the conventional 1 kV, to remove the separate voltage applying means and to sufficiently exhibit the convergence performance.

[Means to solve the problem]

Accordingly, the electron gun of the cathode ray tube according to the present invention has the following characteristics.

That is, three cathodes emitting electron beams, and a triode tube portion each including a first grid electrode and a second grid electrode each having an electron beam passing hole are provided.

In addition, the main lens unit includes a third, fourth and fifth grid electrodes for focusing the three electron beams emitted from the triode through the center thereof.

In addition, a convergence lens unit is provided to share the fifth grid electrode to form a common large-diameter lens between the sixth grid electrode to deflect the side electron beam emitted from the main lens unit.

The convergence lens unit applies a low voltage to the fifth grid electrode and a high voltage to the sixth grid electrode, and thus, the fifth grid electrode connected to the focus voltage applied from the stem pin and the sixth electrode connected to the anode button. It is provided with a grid electrode. Therefore, a common large-diameter lens car is formed between the fifth grid electrode and the sixth grid electrode according to the electric field distribution.

Here, the fifth grid electrode is connected in common with the third grid electrode.

EXAMPLE

Hereinafter, non-limiting embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a partial cross-sectional view showing a cathode ray tube according to the present invention.

As shown, the cathode ray tube includes a face panel 15, a funnel 17 bonded to the panel 15, and a neck 19 that is continuously fused to the funnel 17. The outer container which becomes a vacuum state is comprised.

The electron gun 21 for generating three electron beams Rb, Gb, and Bb is accommodated in the neck 19.

In addition, the outer surfaces of the funnel 17 and the neck 19 have a horizontal deflection coil for generating a magnetic field to deflect three electron beams in a horizontal direction, and a vertical deflection coil for generating a magnetic field for deflecting a vertical direction. The deflecting device 23 which has is provided, and the multipolar magnet 25 which adjusts the trajectory of three electron beams is arrange | positioned at the rear end.

Phosphor 27 is formed on the inner side of the panel 15, and a substantially rectangular shadow mask (not shown) is provided inside the tube at predetermined intervals to face the phosphor 27.

The inner conductive film 29 is applied to some inner walls of the outer container extending from the funnel 17 to the neck 19, and a plurality of stem pins 31 are provided at the end of the neck 19.

Although the electron gun 21 is not shown, the electron gun 21 is electrically connected to the stem pin 31 to which power is applied from the outside.

Here, the electron gun 21 includes three cathode electrodes K for generating electrons, and a triode tube portion including a plate-shaped first grid electrode G1 and a second grid electrode G2 each having an electron beam passing hole. 210 is provided.

In addition, the electron gun 21 is a substantially cylindrical agent that focuses the three electron beams (Rb, Gb, Bb) emitted from the triode 210 by crossing them through a central portion of a common large-diameter lens. The main lens unit 211 includes the third grid electrode G3, the fourth grid electrode G4, and the fifth grid electrode G5.

In addition, the electron gun 21 according to the present invention uses a fifth grid electrode G5 made of a common circular large-diameter electrode in order to deflect the side electron beams Rb and Bb emitted from the main lens unit 211. At the same time, the convergence lens unit 212 is configured to include the sixth grid electrode G6 continuously adjacent to the fifth grid electrode G5.

In the front part of the sixth grid electrode G6, a shield cup 33 having three electron beam through holes is provided, and a contact spring 35 electrically connected to an anode button (not shown) is connected thereto. It is. Therefore, the high voltage Eb of the anode is supplied to the sixth grid electrode G6.

On the other hand, the stem pin 31 is connected to the fifth grid electrode G5. Unlike the anode high voltage Eb, a focus voltage Vf, which becomes a low voltage, is applied to the fifth grid electrode G5, which is again applied to the third grid electrode G5. Focused in common with (G3).

In addition, a cut-off voltage of approximately 150 V to which the image signal is applied is applied to the cathode electrode K, and the stem pin 31 is also applied to the second grid electrode G2 and the fourth grid electrode G4 which are not mentioned. Voltage is applied from

Therefore, the large-diameter electron lens L1 according to the electric field distribution is formed between the fifth grid electrode G5 and the sixth grid electrode G6 in the convergence lens unit 212 configured as described above.

2 shows an optical form of the electron beam in the convergence lens unit as described above.

A large-diameter electron lens L1 according to the electric field distribution is formed between the fifth grid electrode G5 and the sixth grid electrode G6 constituting the convergence lens unit as shown.

Here, one electron beam Bb generated at the cathode K is subjected to the vector combining force F of the force in the large-diameter electron lens L1 region, and is deflected and focused in the direction of the center electron beam Gb as shown.

In addition, the electron beam Rb (not shown) is deflected and focused in the same direction as the one electron beam Bb. In addition, since the central electron beam Gb passes through the center of the large-diameter electron lens L1, the central electron beam Gb is focused without deflection.

Therefore, the three electron beams Rb, Gb, and Bb generated from the cathode K are converted as described above and landed on the phosphor 27 of the panel 15, respectively.

3 shows a convergence lens unit according to another embodiment of the present invention.

As illustrated, the fifth grid electrode G5 has a substantially cylindrical shape, and a reduced inner diameter portion 36 is formed in the fourth grid electrode G4 direction to form the fourth grid electrode G4. It is inserted inward.

In addition, a concentrating reinforcement part 37 having an inner diameter smaller than the flange portion 39 of the sixth grid electrode G6 is formed on the opposite side of the reduced inner diameter portion 36.

As described above, a low pressure is applied to the fifth grid electrode G5 and a high pressure is applied to the sixth grid electrode G6. As a result, the fifth grid electrode ( A relatively strong common focusing lens L2 is formed at the rear end of G5, and a relatively weak common diverging lens L3 is formed at the front end of the sixth grid electrode G6.

Accordingly, a large diameter electron lens L4 is formed between the fifth grid electrode G5 and the sixth grid electrode G6 according to the electric field distribution, which protrudes toward the fifth grid electrode G5. By forming more inclined, the deflection of side electron beams Rb and Bb can be made larger, and conversion can be performed more easily.

4 shows a convergence lens unit according to still another embodiment of the present invention.

As can be seen from the drawing, the fifth grid electrode G5 has a reduced inner diameter 36 in the direction of the fourth grid electrode G4 as described above.

In addition, as described above, the sixth grid electrode G6 includes a reduced inner diameter portion 41 in the direction of the fifth grid electrode G5, and the tip thereof is inserted into the fifth grid electrode G5. It is.

A low pressure is applied to the fifth grid electrode G5 and a high pressure is applied to the sixth grid electrode G6. Thus, the front end of the sixth grid electrode G6 is applied. The large-diameter electron lens L5 is formed thereon.

The large-diameter electron lens L5 is subjected to convergence by deflecting the side electron beams Rb and Bb in the same manner as described through the embodiment.

[Effects of the Invention]

As can be seen through the embodiments described above, the cathode ray tube electron gun according to the present invention comprises a common cylindrical large-diameter electrode in order to converge three electron beams, which is a convergence structure by a deflection plate of the prior art. Will effectively overcome the problem.

That is, according to the present invention, unlike the conventional deflection plate of a complicated structure, it is made by adopting the integrated large diameter electrode having a win-tube shape, it is easy to mount, there is no fear of technical difficulties or welding during welding.

In addition, the present invention applies a focus voltage that becomes a low voltage to the front convergence electrode and connects an anode high voltage to the rear convergence electrode, thereby adopting a substantially simple voltage application method, deviating from the conventional complicated voltage application method. .

Further, according to the present invention, since a separate voltage applying device such as a conventional resistor or a voltage application pin is not required, productivity can be improved and production cost can be achieved.

Claims (4)

A triode tube portion comprising three cathodes for emitting an electron beam, a first grid electrode and a second grid electrode each having an electron beam passing hole; A main lens unit including third, fourth, and fifth grid electrodes for focusing the three electron beams emitted from the triode through the center of the triode; In order to deflect the side electron beam emitted from the main lens unit, a sixth grid electrode which shares the fifth grid electrode and becomes a common large diameter electrode continuous thereto is disposed, and a large diameter lens is formed according to the electric field distribution between the two electrodes. Providing a convergence lens unit; And a focus voltage applied from the stem pin to the fifth grid electrode, and an anode voltage applied from the anode button to the sixth grid electrode. The electron gun of a cathode ray tube according to claim 1, wherein the fifth grid electrode is connected in common with the third grid electrode. The electron gun of the cathode ray tube according to claim 1, wherein the fifth grid electrode includes a focusing reinforcement portion having an inner diameter smaller than the flange portion of the sixth grid electrode in a horizontal direction in which three electron beams are arranged. The electron gun of the cathode ray tube according to claim 1 or 3, wherein the tip of the reduced inner diameter of the sixth grid electrode is inserted into the fifth grid electrode.