KR200276470Y1 - Kalashnikov gun - Google Patents

Abstract

It relates to an electron gun of a color CRT tube in which hot electrons can prevent leakage between electrodes due to a high voltage applied while passing through the electrodes, thereby improving the withstand voltage and accurately forming a focus.

A heater unit supported by the bead glass; A cathode emitting hot electrons; A first electrode; A second electrode; A third electrode and a fourth electrode for accelerating while connecting the hot electrons passing through the first electrode and the second electrode; In the electron gun of the color CRT including a fifth electrode for accelerating the hot electrons,

It is disposed on the outside of the electrodes, and includes a coating means for covering the outer surface of each of the electrodes to prevent adhesion of foreign matter to each of the electrodes and to prevent leakage between the electrodes.

Description

Kalashnikov gun

The present invention relates to an electron gun of a color CRT. More specifically, hot electrons can prevent leakage between electrodes due to a high voltage applied while passing through the electrodes, thereby improving the breakdown voltage and accurately forming a focus. It's about a color CRT electron gun.

In general, a color CRT tube reproduces an image by causing electrons accelerated at high voltage to collide with phosphors of a screen in a predetermined amount to emit light.

When the cathode is heated by a heater to emit hot electrons, the hot electrons are applied at high voltage while passing through a plurality of electrodes constituting the electron gun, and the hot electrons applied at high voltage as described above are applied to the panel. It is operated by the voltage to form the focus on the screen.

Therefore, it is desirable that the outer surface of each electrode of the electron gun does not adhere foreign matter so that hot electrons can be applied at a high voltage of a predetermined size while passing through the electrodes.

However, in the conventional electron gun, each electrode is made of a conductor, and since the outer surface of the electrodes is exposed to the outside as it is, foreign matter is easily attached to the outer surface of the electrodes and leaks easily to the outer surface of the electrodes. As a result, the above-mentioned electrodes are leaked due to the high voltage applied by the hot electrons passing through the electrodes due to the decrease in the work function, which causes the withstand voltage to drop and the focus cannot be accurately formed.

Therefore, the present invention was devised to solve the above problems, and an object of the present invention is to prevent leakage between the electrodes by high voltage applied while hot electrons pass through the electrodes, thereby improving the withstand voltage. In addition, it is to provide an electron gun of a color CRT tube to accurately form a focus.

In order to achieve the above object, the present invention, a heater portion supported on the bead glass; A cathode emitting hot electrons; A first electrode; A second electrode; A third electrode and a fourth electrode for accelerating while connecting the hot electrons passing through the first electrode and the second electrode; In the electron gun of the color CRT including a fifth electrode for accelerating the hot electrons,

It is disposed on the outside of the electrodes, and includes a coating means for covering the outer surface of each of the electrodes to prevent adhesion of foreign matter to each of the electrodes and to prevent leakage between the electrodes.

Accordingly, since the outer surface of each electrode of the electron gun is covered by the non-conducting coating means, foreign matters do not adhere to the electrodes, and electricity does not flow to the outer surface of the electrodes. The high voltage applied while passing through the electrodes prevents leakage between the electrodes.

1 is a partially cutaway perspective view showing an electron gun of a color CRT according to the present invention;

Figure 2 is a partial cutaway side view showing an electron gun of a color CRT according to the present invention.

Hereinafter, a preferred embodiment of the present invention with reference to the accompanying drawings in detail as follows.

1 and 2, the electron gun 1 of the color CRT includes a heater 5 embedded in and supported by the bead glass 3; A cathode 7 heated by the heater 5 to emit hot electrons; A first electrode 9; A second electrode 11; A third electrode 13 and a fourth electrode 15 maintained at different potentials and spaced apart from each other in order to accelerate the hot electrons passing through the first electrode and the second electrode; It may include a fifth electrode 17 for accelerating the hot electrons.

In addition, the heater unit 5 is connected to the stem pin 21 by the base 19, and to remove the residual gas in the bulb on the outer peripheral surface of the shield cup 23 mounted on the fifth electrode 17. The getter 25 is provided, and the bulb spacer 27 for maintaining a constant distance from the bulb is mounted.

The outer surfaces of the electrodes 9, 11, 13, 15, and 17 are disposed on the outside of the electrodes 9, 11, 13, 15, and 17 to prevent foreign matter from adhering to the electrodes and prevent leakage between the electrodes. It may include a coating means 29 for covering.

The coating means may be formed of a coating member 31 formed integrally with the outer surface of each electrode and formed of an insulator so as not to conduct electricity to the outer surface of each electrode.

The coating member 31 may coat the outer surfaces of the electrodes with silicon, which is a non-conductor, by dipping the electrodes in a silicon solution.

The coating member 31 may not be formed at the stem pin 21, the getter 25, and the bulb spacer 27 to which the voltage is applied through each electrode, as well as at the portion where the electrodes are coupled.

Accordingly, when the heater unit 5 is heated to emit hot electrons from the cathode 7, the hot electrons pass through the first electrode 9 and the second electrode 11, and then the third electrode 13 and the third electrode. The light is focused and accelerated while passing through the main lens formed by the through holes of the fourth electrode 15 and the fifth electrode 17, and the phosphor emits light while colliding with the screen of the panel.

At this time, the outer surface of each electrode (9, 11, 13, 15, 17) of the electron gun is covered by the coating member 31 of the coating means 29 which is a non-conductor, so that foreign matters are not attached to each electrode. Electricity does not flow to the outer surfaces of the electrodes, so that the electrodes are not leaked between the electrodes by the high voltage applied while the hot electrons pass through the electrodes.

As described above, the present invention enables to prevent leakage between the electrodes by the high voltage applied by the hot electrons passing through the electrodes by the coating means to improve the withstand voltage and to form the focus accurately. There is.

Claims (3)

A heater unit supported by the bead glass; A cathode emitting hot electrons; A first electrode; A second electrode; A third electrode and a fourth electrode for accelerating while connecting the hot electrons passing through the first electrode and the second electrode; In the electron gun of the color CRT including a fifth electrode for accelerating the hot electrons, It is disposed on the outside of the electrodes, and the coating of the color CRT including coating means for covering the outer surface of each of the electrodes to prevent adhesion of foreign matter to each of the electrodes and to prevent leakage between the electrodes. Electron gun. The electron gun of the color CRT according to claim 1, wherein the coating means is formed integrally on the outer surface of each of the electrodes and is formed of a coating member formed of an insulator so as not to conduct electricity to the outer surfaces of the electrodes. The electron gun of the color CRT according to claim 1, wherein the coating member dips each electrode into a silicon solution to coat the outer surface of each electrode with silicon.