KR100813830B1 - Electron gun for cathode ray tube - Google Patents

Abstract

The present invention relates to an electron gun for a cathode ray tube, and more particularly, to an electron gun for an anode ray tube having an improved installation structure of a resistor used to apply a high voltage to a middle electrode at a reduced pressure.

An electron gun for a cathode ray tube according to the present invention comprises a pair of bead glass for supporting a plurality of electrodes forming a cathode assembly for emitting an electron beam and an electron lens for focusing and accelerating the electron beam emitted from the cathode assembly; Resistors are installed side by side in the longitudinal direction of the bead glass on at least one side of the bead glass; And at least one connector for applying a voltage applied to the resistor from the resistor to the electrodes, and providing an electron gun for the cathode ray tube having improved withstand voltage characteristics by securing a maximum distance from the resistor to the inner surface of the neck portion. .

Description

Electron gun for cathode ray tube

1 is a conventional electron gun for a cathode ray tube, a partially cut-out front view schematically showing a state where a resistor is placed on the bead glass;

2 is a cross-sectional view showing a cross section of FIG.

3 is a perspective view schematically showing an electron gun for a cathode ray tube according to an embodiment of the present invention;

4 is a partially cutaway front view schematically showing a state in which the cathode ray tube electron gun of FIG. 3 is enclosed in a neck portion;

5 is a perspective view schematically showing an electron gun for a cathode ray tube according to another embodiment of the present invention;

Figure 6 is a perspective view schematically showing an electron gun for a cathode ray tube according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

8 Intermediate electrode 20 Bead glass

21 ... resistor 22 ... connector

The present invention relates to an electron gun for a cathode ray tube, and more particularly, to an electron gun for an anode ray tube having an improved structure for installing a resistor used to apply a high voltage to a middle electrode at a reduced pressure.

In general, a cathode ray tube is a type of display component that converts an electrical signal into an optical signal. Cathode electrons (thermal electrons) are emitted from the electron gun (thermal electron generator) installed in the cathode of the cathode ray tube, and these electrons are attracted by the strong positive electricity and are injected along the tube. Deflection York deflects the electrons up, down, left, and right. To enable two-dimensional display. The former hits the back surface of the screen on which the phosphor is coated, that is, the fluorescent surface, and emits the phosphor, and displays images such as letters and figures on the screen. At this time, the electron gun for the cathode ray tube refers to a device for emitting hot electrons as described above.

1 is a conventional electron gun for a cathode ray tube, is a partially cut-out front view schematically showing a state where a resistor is placed on the bead glass, Figure 2 is a cross-sectional view showing a cross-section of FIG.

Referring to the drawings, an electron gun 1 for a cathode ray tube includes a cathode assembly 2, first, second, third, fourth and fifth electrodes 3, 4, 5, 6, and 7, an intermediate electrode 8, and a sixth electrode. (9), and the shield cup 10 is made by combining sequentially. The electrodes are supported at both sides by a pair of bead glass 20 at predetermined intervals to form a bead mount, and are coupled to a stem portion 11 having stem pins formed on the bead mount to provide the electron gun for the cathode ray tube. Are made. In addition, an electron gun for the cathode ray tube assembled as described above is accommodated inside the neck portion 12 of the funnel, and the neck end is sealed.

A high voltage is applied to the electrodes, and a voltage may be applied from the outside by connecting a connector to each electrode from a stem pin formed in the stem, but a high voltage may be directly applied from the inner conductive film. In the latter case, a resistor 21 is provided in the bead glass, and a high voltage applied from an internal conductive film (not shown) is reduced to a voltage required for each electrode and supplied to the electrodes.

As described above, a resistor is used to apply a high voltage to the intermediate electrode at a reduced pressure. In the conventional cathode ray tube electron gun, the resistor 21 is mounted on the bead glass 20 and assembled. The connector 22 is connected to the intermediate electrode 8 from the resistor, the voltage supplied from the outside is reduced by the resistor, and a voltage is applied to the intermediate electrode.

In the conventional cathode ray tube electron gun, since the resistor is placed on the bead glass as shown in FIG. 2, the distance (A) from the resistor to the inner surface of the neck portion from the bead glass (B) is the distance (B) from the upper surface of the bead glass. Smaller than). Since the thickness of the resistor is usually 0.8 mm to 1.0 mm, the distance A becomes smaller than the distance B by this thickness.

As the distance (B) from the resistor to the inner surface of the neck is closer, there is a high risk of resistance value change due to the discharge during the high pressure aging treatment, the high pressure treatment is not good, leakage during operation of the electron gun There is a problem in that the reliability is deteriorated, such as deterioration of the voltage resistance characteristics such as generation of a discharge by a current, deterioration in focus performance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the object of the present invention is to provide a cathode ray tube electron gun having improved withstand voltage characteristics by ensuring a maximum distance from the resistor to an inner surface of the neck portion of the cathode ray tube electron gun.

Electron gun for cathode ray tube according to the present invention to achieve the above object,

A pair of bead glass for supporting a cathode assembly that emits an electron beam and a plurality of electrodes that form an electron lens for focusing and accelerating the electron beam emitted from the cathode assembly at predetermined intervals;

Resistors are installed side by side in the longitudinal direction of the bead glass on at least one side of the bead glass; And

And at least one connector for applying a voltage applied to the resistor from the resistor to the electrodes.

In addition, the resistor is characterized in that attached to the side of the bead glass.

In addition, a groove is formed in the longitudinal direction on the side of the bead glass to have a predetermined depth in the width of the thickness of the resistor, characterized in that the resistor is inserted into the groove.                     

In addition, a step is formed in the longitudinal direction to have a predetermined depth at the lower end of one side of the bead glass, characterized in that the resistor is immersed in the step.

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

3 is a perspective view schematically showing an electron gun for a cathode ray tube according to an embodiment of the present invention.

Referring to the drawings, a cathode ray tube electron gun 1 according to an embodiment of the present invention includes a cathode assembly that emits an electron beam and a plurality of electrodes that form an electron lens that focuses and accelerates the electron beam emitted from the cathode assembly. Is done. At this time, the cathode ray tube electron gun 1 is similar to a conventional electron gun, the cathode assembly 2, the first, second, three, four, five electrodes (3, 4, 5, 6, 7), the intermediate electrode (8) The sixth electrode 9 and the shield cup 10 may be sequentially coupled to each other at predetermined intervals in a direction in which the electron beam is emitted. The electrodes are supported on both sides by a pair of bead glass 20 at predetermined intervals.

In addition, resistors 21 are disposed side by side in the longitudinal direction of the bead glass on at least one side surface of the bead glass. In this case, the resistor may be attached to the side of the bead glass. In addition, the resistor may be supported and installed by a predetermined support means on the electrodes on the side of the bead glass. The resistor may be formed by inserting a metallic resistor into the insulator of the ceramic system. In this case, the shell of the resistor that surrounds the metallic resistor does not pass through electricity.

In addition, the connectors 22 distribute and supply the voltage applied to the resistor to the predetermined electrodes with the voltages required for each. The connectors form a terminal at a required position of the resistor and are connected to the electrode therefrom, where necessary, a terminal is formed at the resistor and connected to each required electrode by connecting means such as welding. Further, in the case where the resistor is supported by the predetermined support means on the electrodes on the side of the bead glass, the connectors may be used as the support means.

As the support means, the above methods may be used in combination. One side of the resistor may be attached to one side of the bead glass, and may be supported by the support means as described above on the electrodes, or may be supported by the connector as the support means.

4 is a partially cutaway front view schematically showing a state in which the cathode ray tube electron gun of FIG. 3 is enclosed in the neck portion.

Referring to the drawings, the illustrated cathode ray tube electron gun has the same configuration as the above example except for the following features. Therefore, the same reference numerals as those used in FIG. 3 are used for the same components, and detailed description thereof will be omitted.

The electron gun 1 for the cathode ray tube includes a cathode assembly 2, first, second, third, fourth, fifth electrodes (3, 4, 5, 6, 7), an intermediate electrode 8, a sixth electrode 9, and Shield cup 10 is made by combining sequentially. The electrodes are supported at both sides by a pair of bead glass 20 at predetermined intervals to form a bead mount, and are coupled to a stem portion 11 having stem pins formed on the bead mount to provide the electron gun for the cathode ray tube. Is made. In addition, an electron gun for the cathode ray tube assembled as described above is accommodated inside the neck portion 12 of the funnel, and the neck end is sealed. In addition, resistors 21 are disposed side by side in the longitudinal direction of the bead glass on at least one side surface of the bead glass.

A high voltage is applied to the electrodes, and a voltage may be applied from the outside by connecting a connector to each electrode from a stem pin formed in the stem, but voltage may be directly applied from the internal conductive film through the resistor from the inner conductive film. have. In the case of the present invention, a resistor 21 is provided in the bead glass, and a high voltage applied by the connector 13 from an inner conductive film (not shown) is reduced to a voltage required for each electrode and supplied to the electrodes.

In this case, one end 211 of the resistor is electrically connected to the connector 13 connected from the inner conductive film, and the other end 212 of the resistor is connected to one of the stem pins to be electrically connected to the earth potential. do. Thus, a voltage of 25 to 35 KV drawn from the inner conductive film is applied to the sixth electrode, which is the final acceleration electrode, and the voltage drawn from the inner conductive film is reduced by the resistor to be applied to the intermediate electrode or other necessary electrodes. .

5 is a perspective view schematically showing an electron gun for a cathode ray tube according to another embodiment of the present invention.

Referring to the drawings, the illustrated cathode ray tube electron gun has the same configuration as the above example except for the following features. Therefore, the same reference numerals as those used in FIG. 3 are used for the same components, and detailed description thereof will be omitted.

In the electron gun for cathode ray tube according to the present embodiment, a groove is formed in the longitudinal direction to have a predetermined depth at the side of the bead glass 20 with a width of the thickness of the resistor 21, the resistor is inserted into the groove is installed, the connector 22 may be connected to the required electrodes from the resistor.

Although the support means of the resistor used in the embodiment shown in FIG. 3 may be used, in the present embodiment, since the resistor is inserted into a groove formed on the side of the bead glass, the support means is required if necessary. It may not be. In particular, the resistor may be fixed to the groove using fixing means such as an adhesive, in which case it will be more so.

6 is a perspective view schematically showing an electron gun for a cathode ray tube according to another embodiment of the present invention.

Referring to the drawings, the illustrated cathode ray tube electron gun has the same configuration as the above example except for the following features. Therefore, the same reference numerals as those used in FIG. 3 are used for the same components, and detailed description thereof will be omitted.                     

The electron gun for the cathode ray tube according to the present embodiment is formed with a step in the longitudinal direction to have a predetermined depth at the bottom of one side of the bead glass 20, the resistor 21 is immersed in the step is installed, the connectors 22 It may be connected to the required electrodes from the resistor.

 In this embodiment, since the resistor is immersed in the step formed on the side of the bead glass, the resistor is attached to the portion where the step of the bead glass is formed by adhesive means such as an adhesive as shown in FIG. Alternatively, a separate support means may be used. Also, as in the embodiment shown in FIG. 3, the connectors may be used as a supporting means of the resistor.

According to the electron gun for cathode ray tubes of the present invention described above,

By maximizing the distance from the resistor to the inner surface of the neck portion, it is possible to prevent the generation of arc discharge or leakage current that may occur between the resistor and the inner surface of the neck portion, thereby improving the withstand voltage characteristics.

In addition, it is possible to secure the reliability of the resistor by reducing the breakage of the resistor due to the process such as high pressure aging treatment in the manufacturing process.

In addition, since a voltage is applied from the internal conductive film through the resistor, the number of the stem pins to which a voltage is applied from the outside can be reduced, and the complicated connectors connected from the stem pins can be reduced.

In addition, the stable focus quality of the entire cathode ray tube can be obtained by securing the reliability of the resistor, and the reliability of the cathode ray tube according to the present invention can be increased by the above effects.

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, it is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. will be. Therefore, the true scope of protection of the present invention should be defined by the technical spirit of the appended claims.

Claims (4)

delete delete A pair of bead glass for supporting a cathode assembly that emits an electron beam and a plurality of electrodes that form an electron lens for focusing and accelerating the electron beam emitted from the cathode assembly at predetermined intervals; Resistors are installed side by side in the longitudinal direction of the bead glass on at least one side of the bead glass; And At least one connector for applying a voltage applied to the resistor from the resistor to the electrodes, An electron gun for a cathode ray tube, wherein a groove is formed in a longitudinal direction on a side of the bead glass so as to have a predetermined depth in a width of the thickness of the resistor, and the resistor is inserted into the groove. A pair of bead glass for supporting a cathode assembly that emits an electron beam and a plurality of electrodes that form an electron lens for focusing and accelerating the electron beam emitted from the cathode assembly at predetermined intervals; Resistors are installed side by side in the longitudinal direction of the bead glass on at least one side of the bead glass; And At least one connector for applying a voltage applied to the resistor from the resistor to the electrodes, An electron gun for a cathode ray tube, wherein a step is formed in a longitudinal direction at a lower end of one side of the bead glass to have a predetermined depth, and the resistor is inserted into the step.

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