KR100300308B1 - Electron gun of cathode ray tube - Google Patents

Abstract

PURPOSE: An electron gun of a cathode ray tube is provided to simplify a configuration, easily performing a mounting operation, and a performance of a product 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(G6,G7) 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 seventh grid electrode(G7) which has three electron beam through holes. A contact spring(35) is electrically connected to an anode button.

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 (a, b) is a perspective view showing a grid electrode constituting the convergence lens unit of the present invention.

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

4 and 5 are cross-sectional views showing a convergence lens unit of another embodiment according to the present invention.

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

Industrial use

The present invention relates to an electron gun of a cathode ray tube, and more particularly, to an inline array electron gun which focuses three electron beams as a common large-diameter lens and performs convergence on a screen.

Conventional technology

As is known, as the cathode ray tube is colored, an inline array structure is proposed in which an electron gun accelerates and focuses three electron beams through a plurality of electrodes, and converges them and lands them on the corresponding R, G, and B phosphors on 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, the diameter of the open hole of the electrode is increased to form a large-diameter lens, or to increase the distance between the electrodes to form a long-focused lens.

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. In addition, in order to realize such a large diameter, it is possible to form a large diameter of the neck, but this is due to the increase in power of the deflection yoke and the difficulty of convergence, and thus reaches a limit.

As a way to solve this problem, Japanese Patent Laid-Open Nos. 61-188840 and 63-10440 are provided with a common large-diameter lens, and an electron gun in which three electron beams cross and converge so as to pass through the center portion thereof. Is proposed.

6 is a conceptual diagram showing a known example of an electron gun having the above common large-diameter lens.

As shown, the three electron beams emitted from the triode 1 are incident and intersected so as to converge in the main lens unit 3, and are focused by a focusing lens with a low spherical aberration formed by the common large-diameter electrode 5. And a pair of deflection plates 7 and 9 on the inner and outer sides arranged flat in the tube axis direction at the rear end of the main lens unit 3 to pass through the aperture of the shadow mask 11 and onto the screen ( 13) to be landed on the phosphor.

Here, the deflection plate emits from the main lens part by applying a voltage of V1> V2 to the pair of electrodes 7 and 9 on the inner side and the outer side to form an electric field formed inward from the side of the deflection plate. The two electron beams R and B are converged on the screen.

Problems the invention tries to solve

On the other hand, in the method of applying different voltages to the deflection plate as described above, the high pressure applied from the anode button is connected to the inner deflection plate, and the low voltage obtained by dropping the anode voltage to around 1 kV through the resistor is connected to the outer deflection plate. Is achieved.

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 deflection plates as described above.

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 by 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 one cathode ray plate.

In addition, the present invention is to drive the common large diameter electrode, that is, the convergence electrode at a low voltage lower than the voltage of 1kV of the conventional anode voltage, thereby eliminating a separate voltage application means, and to achieve the convergence performance sufficiently another object is have.

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 including sixth and seventh grid electrodes including a common large-diameter electrode is provided to deflect the side electron beam emitted from the main lens unit.

The convergence lens unit applies a low voltage to the sixth grid electrode and a high voltage to the seventh grid electrode, and is connected to the sixth grid electrode connected to the focus voltage applied from the step pin and the anode button. And a seventh grid electrode. Accordingly, a common focusing lens is formed on the sixth grid electrode, and a common diverging lens that is relatively weaker than the focusing lens is formed on the seventh grid electrode.

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

In addition, the sixth grid electrode may be connected to a low voltage applied from the second 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 shape that focuses the three electron beams (Rb, Gb, Bb) emitted from the triode 210 by crossing a central portion of a common large-diameter electron lens through the center thereof. 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 includes a sixth grid electrode G6 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, and The convergence lens unit 212 is configured to include the seventh grid electrode G7.

In the front part of the seventh grid electrode G7, 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 seventh grid electrode G7, which is connected to the third grid electrode G3 and the fifth grid electrode G5, which are re-powered in common, to provide a high voltage in common. Will be authorized.

On the other hand, the step pin 31 is connected to the sixth grid electrode G6. Unlike the anode high voltage Eb, the focus voltage Vf, which becomes a low voltage, is applied to the sixth grid electrode G6.

In addition, a cut-off voltage of approximately 15OV to which the image signal is applied is applied to the cathode electrode K, and the step 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

Meanwhile, the sixth grid electrode G6 described above may be connected to a low voltage applied by the second grid electrode G2 as another example of the present invention, and may be connected to the fourth grid electrode G4 in common. The performance is shown to be the same as described above.

Accordingly, the convergence lens unit 212 configured as described above has a weaker common divergence than the common focusing lens formed by the sixth grid electrode G6 and the focusing lens formed by the seventh grid electrode G7. The lens is formed, which substantially forms the large-diameter electron lens L1 between the sixth grid electrode G6 and the seventh grid electrode G7.

FIG. 2 (a) shows a sixth grid electrode constituting the convergence lens unit.

The sixth grid electrode G6 is formed of a substantially cylindrical electrode, and the inner diameter of the seventh grid electrode G7 is inward in a horizontal direction in which three electron beams are arranged at an end thereof close to the seventh grid electrode G7. The focus reinforcement part 37 which is reduced and formed is protrudingly formed.

In addition, a seventh grid electrode constituting the above-mentioned convergence lens unit is shown in FIG. 2 (b).

Similarly, the seventh grid electrode G7 is formed of a substantially cylindrical electrode, and an annular flange portion 39 having an inner diameter smaller than that of the focus reinforcement portion 37 at an end thereof close to the sixth grid electrode G6. Is formed.

As described above, a low pressure is applied to the sixth grid electrode G6 and a high pressure is applied to the seventh grid electrode G7, so that the sixth grid electrode ( A relatively strong common focusing lens is formed at the rear end of G6), and a relatively weak common diverging lens is formed at the front end of the seventh grid electrode G7.

3, the shape of the electron beam in the convergence lens unit is optically shown.

The large-diameter electron lens L1 as shown is formed between the sixth grid electrode G6 and the seventh grid electrode G7 constituting the convergence lens unit.

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 center electron beam Gb passes through the center of the large-diameter electron lens L1, the center 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.

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

As can be seen from the figure, auxiliary electrodes 41 and 43 having three independent electron beam through holes are provided inside the sixth grid electrode G6 and the seventh grid electrode G7.

In the auxiliary electrodes 41 and 43, the side electron beam passing holes are provided to be eccentric with respect to the traveling direction of the electron beam. That is, the centers of the side electron beam passing holes of the auxiliary electrode 41 disposed at the front end and the side electron beam passing holes of the auxiliary electrode 43 arranged at the rear end are formed to be offset from each other. The ball is more eccentric to the outside.

Therefore, according to the auxiliary electrodes 41 and 43, a large-diameter electron lens L2 having an eccentrically independent small-diameter focusing lens is formed at the front end, which further increases the amount of deflection of the side electron beams Rb and Bb. Thus, convergence can be easily performed.

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

As can be seen from the figure, inside the sixth grid electrode G6 and the seventh grid electrode G7, as described above, auxiliary electrodes 45 and 47 having three independent electron beam through holes are mounted. .

Here, the auxiliary electrode 45 has a side electron beam through hole in which the thickness T1 of the outer wall is greater than the thickness T2 of the inner wall with respect to the horizontal direction (vertical direction of the drawing) in which the three electron beams are arranged. It is provided with.

Therefore, according to the auxiliary electrodes 45 and 47, the large-diameter electron lens L3 having the independent small-diameter focusing lens eccentrically formed at the front end is formed, and the independent small-diameter lenses on both sides of the side are formed to be inclined, so that the side electron beam By increasing the deflection amount of (Rb, Bb), convergence can be carried out more easily.

[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 employing a cylindrical integrated diameter large diameter electrode, it is easy to mount, there is no fear of technical difficulties during welding or deformation of the electrode.

In addition, the present invention applies a focus voltage focused on a stem pin or a second grid electrode which becomes a low voltage to the front convergence electrode, and connects an anode high voltage to the rear convergence electrode, thereby avoiding the conventional complicated voltage application method. A substantially simple voltage application method is adopted.

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 (7)

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; Providing a convergence lens unit including sixth and seventh grid electrodes made of a common large-diameter electrode to deflect the side electron beam emitted from the main lens unit; And a focus voltage applied from the step pin to the sixth grid electrode, and an anode voltage applied from the anode button to the seventh grid electrode. The electron gun of a cathode ray tube according to claim 1, wherein the seventh grid electrode is connected in common with the third and fifth grid electrodes. The electron gun of a cathode ray tube according to claim 1, wherein the sixth grid electrode is connected to the low voltage applied from the second grid electrode and is connected in common with the fourth grid electrode. 2. The cathode of claim 1, wherein the sixth grid electrode has a focusing reinforcement 37 which is formed to be smaller than the inner diameter of the seventh grid electrode in a horizontal direction in which three electron beams are arranged. Electron gun. The electron gun of the cathode ray tube according to claim 1, wherein an auxiliary electrode having three independent electron beam through holes is provided inside the sixth grid electrode and the seventh grid electrode. The electron gun of the cathode ray tube according to claim 5, wherein the two auxiliary electrodes (41, 43) are provided with side electron beam through holes eccentric with each other. The auxiliary electrode 45 provided in the sixth grid electrode has a side electron beam through hole having a thickness of an outer wall greater than an inner wall in a horizontal direction in which three electron beams are arranged. Electron gun of cathode ray tube.