KR200185281Y1 - Inline type electron gun for cathode-ray tube - Google Patents

Abstract

The present invention relates to a cathode of a cathode ray tube electron gun, and more particularly to an inline electron gun for cathode ray tube to improve the lifetime reliability and focus quality of the electron gun by placing the cathode perpendicular to the first electrode.

In the case of the conventional electron gun, when the structure of the cathode and the structure of the eyelet are not parallel to the surface where the oxide of the cathode is attached and the surface of the first electrode, or the center of the electron beam through hole of the first electrode and the surface of the oxide of the cathode is deviated much. The life of the CRT is shortened, and the spot shape of the screen is not symmetrical and causes asymmetrical halo on the left, right side, or the top and bottom side, thereby reducing the resolution.

The present invention is provided with a cathode support portion that is bent into the cylindrical side on the side of the eyelet 113 so that the cathode 110 is disposed perpendicular to the first electrode 121 in order to improve the lifetime reliability and focus quality of the electron gun for cathode ray tube In one embodiment, the cathode support is characterized by consisting of three or more pedestals 114 bent into a cylindrical shape on the side of the eyelet 113.

Description

Inline type electron gun for cathode-ray tube

The present invention relates to a cathode of an electron gun for a cathode ray tube, and more particularly, to a cathode ray tube inline electron gun that allows the cathode to be disposed perpendicularly to an eyelet, so that the cathode is more efficient when emitting an electron beam, and prevents deterioration of the life of the electron gun and quality deterioration during a drop test. It is about.

The configuration of a typical cathode ray tube is the same as the cross-sectional view shown in FIG.

Each electrode of the in-line electron gun for cathode ray tubes is directed to a path through which the electron beams 13, 14, 15 pass so that the electron beam generated at the cathode 3 can be controlled in a constant intensity to reach the screen 17. They are located at regular intervals from each other to be vertical.

As shown in the drawings, the three cathodes 3 which are independent of each other, the first electrode 4 which is a common lattice arranged at a predetermined distance from the cathode, and the second electrode 5 which are arranged at regular intervals from the first electrode and The third electrode 6, the fourth electrode 7, the first electrode 8a of the fifth electrode, the second electrode 8b of the fifth electrode, and the sixth electrode 9 are arranged in this order.

The upper part of the sixth electrode 9 is an inline type electron gun configured in the order of the shield cup 10 with the BSC 11 attached thereto, and the cut-off voltage of each electron gun must be the same. Different voltages are supplied to these cathodes to obtain current values.

The operation of the electron gun is that the heater 2 built in the cathode 3 receives a voltage from the stem pin 1 to emit electrons from the cathode 3, and the electrons are discharged to the first electrode 4. The electron beams 13, 14 and 15 are controlled by this, and the electron beams 13, 14 and 15 are accelerated by the 2nd electrode 5 which is an acceleration electrode, and the 2nd electrode 8b of the 5th electrode which is a main lens formation electrode is carried out. ) And the sixth electrode 9 pass through the shadow mask 16 provided on the inner surface of the fluorescent surface 18 to collide with the fluorescent surface 18 to emit light.

In addition, a deflection yoke 12 is disposed to deflect the electron beams 13, 14, and 15 emitted from the outside of the electron gun to the entire screen 17.

Fig. 5 is a view showing in detail the three poles of the conventional electron gun for cathode ray tubes.

The triode consists of the cathode 3, the first electrode 4 and the second electrode 5. In this figure, the cathode 3 is inserted into the eyelet 31 and welded at a predetermined distance from the first electrode 4, the eyelet 31 is welded with the bead supporter 32, and the bead supporter 32 is again It is inserted into the glass 19 to be fixed.

The eyelet 31 has a cylindrical shape and a flange is formed on an upper portion of the eyelet 31.

Referring to the operation of the prior art having such a configuration as follows.

The cathode 3 used for the CRT electron gun is inserted into the inside of the eyelet 31 which is welded and fixed to the eyelet bead supporter 32 to maintain a constant distance from the first electrode 4. The heater 2 is inserted into the cathode 3 by welding and fixing the end opposite to the flange portion of the eyelet and the end opposite to the portion where the oxide of the cathode is attached.

The cathode 3 uses hot electrons and the operating temperature reaches about 800 ° C. When a current flows in the heater 2 inserted in the cathode 3, the temperature rises, and this temperature is transmitted to the cathode 3 by radiation. In addition, heat transferred to the cathode 3 is transferred to the eyelet 31 and the first electrode 4 through conduction and radiation. Heat transferred to the eyelet 31 and the first electrode 4 transfers heat to the bead supporter 32 and the second electrode 5 again. The heat transmitted by conduction and radiation causes the first electrode 4, the second electrode 5, the third electrode 6 and the cathode 3, the eyelet 31, and the bead supporter 32 to reach a predetermined temperature. When the temperature rises, the components of the electron gun undergo thermal expansion.

Thermal expansion of the cathode 3 occurs instantaneously and the direction expands towards the first electrode 4. The temperature of the eyelet gradually rises and gradually expands in the opposite direction of the first electrode 4.

The expansion direction of the first electrode 4 expands toward the second electrode 5, and the expansion direction of the second electrode 5 expands toward the first electrode 4.

Therefore, the expansion direction of the first electrode 4 and the second electrode 5 is greatly affected by the shape of the first electrode 4 and the second electrode 5.

The cathode ray tube using an inline electron gun applies a voltage to the cathode 3 to generate a desired current. The amount of the electron beam is determined by the difference in the voltage across the cathode. When voltage is applied to each electrode of the electron gun, the voltage of the cathode 3 in which electrons are not generated in the cathode 3 is set. In this state, the amount of current is controlled while applying the voltage of the cathode 3.

When the CRT is turned on in the related art, a constant voltage is applied to each electrode of the electron gun, and a constant voltage is also applied to the cathode 3 and the heater 2. The voltage applied to the cathode 3 is a cut-off level voltage and varies depending on the type of electron gun.

When a voltage is applied as described above and a signal is input to the cathode 3 at the same time, electrons are emitted from the cathode 3. The amount of electrons emitted at this time is determined by the potential difference between the cathode 3, the first electrode 4, and the second electrode 5, and the lifetime of the CRT is determined by the amount of electrons emitted. . The stable and uniform release of electrons of the cathode (3) oxide further extends the life of the CRT. However, in general, due to the structure of the cathode 3 and the structural problems of the eyelet 31 and the flow of the cathode 3 during the drop test, as shown in FIG. The surfaces are not parallel or the centers of the electron beam through holes of the first electrode and the surfaces of the oxides of the cathode deviate a lot, which causes some problems as follows.

first; The life of CRT is shortened.

That is, FIG. 6 illustrates a case where the oxide surface of the cathode and the surface of the first electrode are inclined as shown in FIG. 6, in which the electric field penetrated from the second electrode concentrates the hot electrons of the cathode excited in the vicinity of the electron beam through hole. Because of the emission, the local part of the cathode inevitably shortens the life due to the large emission compared to other parts.

second; When the inclined oxide surface of the cathode and the center of the electron beam through hole of the first electrode do not coincide, the electrons excited by the heating of the heater on the cathode oxide surface are penetrated by the electron beam through the electron beam through hole of the first electrode. When eliciting, the electric field of the first electrode 4 is biased to attract electrons, so the distribution of electrons is uneven, so that the repulsive force between the electrons acts non-uniformly, and this irregular repulsive force causes the electron beam to deviate from the normal path.

FIG. 7A illustrates the cathode current amount with respect to the radius of the cathode oxide surface, and FIG. 7B is an example of a halo phenomenon of a screen spot caused by irregular repulsive force between electrons.

As a result, the spot shape of the screen is not symmetrical and causes asymmetrical halo on the left, right, or top and bottom sides, thereby lowering the resolution.

In order to improve such a problem, the present invention has a support means on the cathode side of the cathode ray gun electron gun, so that the cathode is disposed perpendicular to the first electrode to improve the lifetime reliability and focus quality for the cathode ray tube inline electron gun The purpose is to provide.

1 is a cross-sectional view showing a configuration of a cathode ray tube to which the present invention is applied.

Figure 2 (a), (b) is a cross-sectional view of an embodiment of the tripolar configuration according to the present invention.

Figure 3 is a working state of the spanset according to the present invention.

4 is a cross-sectional view showing a typical cathode ray tube configuration.

5 is a cross-sectional view of a three-pole configuration of the conventional electron gun for cathode ray tubes.

6 is a cross-sectional view showing a state where the oxide surface of the cathode and the surface of the first electrode are inclined in the conventional electron gun.

7 is a phenomenon appearing in a conventional inclined state,

(a) is a graph of the cathode current versus the cathode oxide radius.

(b) is the blur of the screen spot.

* Description of the symbols for the main parts of the drawings *

110: cathode 111: heater

112: stem pin 113: eyelet

114: pedestal 115: bead supporter

121: first electrode 122: second electrode

123: third electrode 124: fourth electrode

125: first electrode of the fifth electrode

126: second electrode of the fifth electrode

127: sixth electrode 130: shield cup

140: B.S.C 150,151,152: electron beam

160: fluorescent surface 170: shadow mask

180: screen 190: deflection yoke

200: glass 210: nozzle

220: cathode support

In order to achieve the above object, the present invention includes a plurality of cathodes for emitting an electron beam; Concentrating the three-pole portion consisting of a control electrode and an acceleration electrode for controlling the radiation amount of the electron beam, at least one prefocus lens portion consisting of two or more electrodes that serve to focus a predetermined amount of the electron beam, and focusing the electron beam on the screen An inline type electron gun for a cathode ray tube composed of a focusing electrode and a cathode electrode forming a main lens for forming a support means formed on the cathode by welding directly to the side of the body to be in close contact with the eyelet during assembly to support the cathode. ,

The support means is composed of three or more pedestals which are welded to the side of the cathode body to be in close contact with the inner surface of the eyelet to support the cathode, and the front end portion of the pedestal is smoothly bent and rounded at the end that is in close contact with the inner surface of the eyelet. do.

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

1 is a sectional view of an inline electron gun for a cathode ray tube to which the present invention is applied.

Each electrode 121, 122, 123, 124, 125, 126, 127 of the inline electron gun for a cathode ray tube has an electron beam 150, 151, 152 generated from the cathode 110 to be controlled in a constant intensity to reach the screen 180 in order to reach the screen 180. They are located at regular intervals from each other to be vertical.

As shown in the drawing, the first electrode 121 and the first electrode 121 which are spaced apart by a predetermined distance as a common lattice of the three cathodes 110 and the three cathodes 110 which are mutually independent are arranged at regular intervals. Second electrode 122, third electrode 123, fourth electrode 124, first electrode 125 of fifth electrode, second electrode 126 of fifth electrode, and sixth electrode 127 The sixth electrode 127 has an inline electron gun configured in the order of the shield cup 130 with the BSC 140 attached thereto, and the cut-off voltage of each electron gun must be the same. Different voltages are supplied to the cathode 110 to obtain a constant current value.

In addition, the electron gun emits electrons from the cathode 110 when the heater 111 embedded in the cathode 110 receives a voltage from the stem pin 112, and the electrons are emitted by the first electrode 121. 150, 151, 152 is controlled, and the electron beams 150, 151, 152 are accelerated by the second electrode 122, which is an acceleration electrode, and passes through the second electrode 126 and the sixth electrode 127 of the fifth electrode, which is the main lens forming electrode. By passing through the shadow mask 170 installed on the inner surface of the fluorescent surface 160 and collides with the fluorescent surface 160 to emit light. In addition, a deflection yoke 190 is disposed to deflect the electron beams 150, 151, and 152 emitted from the electron gun from the outside of the electron gun to the entire screen 180.

Figure 2 is a schematic view showing a cross-section of the three poles as the subject matter of the present invention.

Figure 2 (a) is one embodiment of the present invention, Figure 2 (b) is another embodiment.

The cathode 110 forming the triode is inserted into the eyelet 113 and welded to the first electrode 121 at a predetermined distance, and the eyelet 113 is welded to the bead supporter 115 and the bead supporter 115. ) Is inserted into the glass 200 again to be fixed.

The cathode 110 is formed in the support means that is in close contact with the eyelet 113 when assembled to weld directly to the side of the cathode body to support the cathode (110).

The support means is composed of three or more pedestals 114 which are welded to the cathode body side to be in close contact with the inner surface of the eyelet to support the cathode. In addition, the front end portion of the pedestal 114 is smoothly bent round the end portion in close contact with the inner surface of the eyelet so that the operation is made smoothly.

The process of welding the ends of the eyelet 113 and the cathode 110 by pressing the cathode 110 slowly into the eyelet 113 and stopping at a predetermined distance from the first electrode 121 is performed. set).

As described above, a bead mount in which cathodes, various electrodes, and eyelets are disposed at regular intervals is mounted on the spanset device so that the surface of the oxide of the first electrode and the cathode has a constant distance. Fine adjustment is required.

However, even when making such fine adjustments, the trimming is performed to closely contact the welded portions of the eyelet and the cathode, and the nozzle 210, which is a distance measuring part of the spanner device due to the minute vibration and the structural features of the cathode, is used. The distance H with is adjusted, but it is impossible to confirm or adjust the inclination of the cathode oxide surface with the surface of the first electrode.

As shown in FIG. 3, since a plurality of pedestals 114 supporting the cathode 110 are formed in the body of the cathode 110 while being welded thereto and closely attached to the eyelet 113, precision work is possible in the spanning operation. do.

That is, when the cathode mounted on the cathode support 220 of the spanner device is inserted into the eyelet 113 of the bead mount, the adjustment operation for pushing the cathode 110 to have a constant distance from the first electrode 121. When the pedestal 114 is attached to the body of the cathode 110 to support the cathode 110 so that the cathode 110 is located in the center of the eyelet 113.

The cathode positioned at the center of the eyelet prevents the inclination between the cathode oxide surface and the first electrode surface, which may occur between the conventional cathode and the first electrode, thereby reducing the lifespan of the conventional problem and the screen caused by uneven electron beam emission. It is possible to prevent the deterioration of focus and to prevent the deterioration of focus due to the flow of cathode during the drop test.

As described above, the present invention is a cathode and an electron gun for a cathode ray tube having a first electrode and a second electrode surrounding at least the cathode and the cathode to form a support which is welded to the body of the cathode and is in close contact with the eyelet to make the uniform and stable electrons of the cathode. It is a very useful technique that can contribute to the emission and prevent the deterioration of focus caused by the flow of cathode during the drop test to improve the life of the CRT and the focus quality of the screen.

Claims (3)

A plurality of cathodes emitting an electron beam; Concentrating the three-pole portion consisting of a control electrode and an acceleration electrode for controlling the radiation amount of the electron beam, at least one prefocus lens portion consisting of two or more electrodes that serve to focus a predetermined amount of the electron beam, and focusing the electron beam on the screen In the in-line electron gun for cathode ray tube composed of a focusing electrode and a positive electrode forming a main lens for The cathode is in-line electron gun for cathode ray tube, characterized in that the support means is formed in close contact with the eyelet when the assembly is configured to weld directly to the side of the body to support the cathode. According to claim 1, The support means An inline electron gun for cathode ray tubes, characterized in that it consists of three or more pedestals (114) welded to the side of the cathode body to adhere to the inner surface of the eyelet to support the cathode. The method according to claim 2, Inline type electron gun for cathode ray tube, characterized in that the front end portion of the pedestal 114 is bent round the end portion in close contact with the inner surface of the eyelet.