KR20010017108A - the grid-structure of the electron gun in a braun-tube - Google Patents

Abstract

PURPOSE: A structure of an electrode in an electron gun for a color cathode ray tube is provided to prevent the electrode from being inclined due to the tensile strength during stretching of a tap welded to the electrode toward a stem by improving a structure of the electrode in the electron gun for the color cathode ray. CONSTITUTION: The structure of an electrode in an electron gun for a color cathode ray tube according to the present invention includes a stem(60) for applying a voltage to an electrode, a stem pin(61) being installed at the stem(60), electrode plates having holes for allowing an electronic beam to pass through, tap connecting portions being formed at the electrode plate, electrodes being comprised of the electrode plates and the tap connecting portions, and a tap for connecting the electrode with the stem pin. The thickness of the tap connecting portion in formed at the electrode plate is smaller than that of the electrode plate. As a result, the force applied to the tap connecting portion is adsorbed therein.

Description

Electrode structure of the electron gun for CRT {the grid-structure of the electron gun in a braun-tube}

The present invention relates to a cathode ray tube, and more particularly to an electrode structure of an electron gun for a cathode ray tube.

In general, a flat CRT is a panel 13 having a fluorescent surface 11 on which red, green, and blue strips or dots of phosphor layers are formed, as shown in FIG. 12, the rail 19 fixed by the frit glass 22 to fix the shadow mask 18 to the panel, the inner shield 20 to prevent the influence of the geomagnetic field, and to reduce the howling phenomenon. A wire damper 23, a funnel 14 coupled to an inner surface of the panel 13 by a frit glass 22, and an electron gun encapsulated in a neck 15 of the funnel to emit an electron beam 16 ( 17 and a deflection yoke 21 for deflecting the beam 16 to the front surface of the panel 13.

The image reproduction process of the planar CRT having such a configuration is as follows.

When an image signal is input to the electron gun 17 enclosed in the neck portion 15 of the funnel 14, the electron beam 16 is emitted from the cathode (not shown) of the electron gun 17, and the emitted electron beam 16 ) Is controlled, accelerated and focused by the voltage applied to each electrode of the electron gun 17, and then passes through the shadow mask 18 with the orbit modified in the horizontal and vertical directions by the static magnetic field of the deflection yoke 21. By emitting the phosphor 11 coated on the inner surface of the panel 13, the image is reproduced.

Based on the configuration and operation principle of the CRT, the inline electron gun of the CRT will be described in more detail.

As shown in FIG. 2, three mutually independent cathodes 40 emitting electron beams 16, a first lattice 110, which is a common lattice of three cathodes disposed at a predetermined distance from the cathode, Power supply for applying different constant voltages to the second, third, fourth, fifth, sixth electrodes 120, 130, 140, 150, and 160 arranged at regular intervals from the first electrode. Cause The stem 60, the stem pin 61 installed on the stem, the tab 70 connecting the stem pin and the electrode to each other, and the shield cup 50 located immediately after the sixth electrode 160. And a bulb space connector 51 positioned between the shield cup and the neck portion 15 to support the electron gun 17 to the CRT.

In the electron gun 17 made as described above, the heater 41 embedded in the cathode 40 receives power from the stem pin 61 to generate heat, and the electron beam 16 is emitted from the cathode 40 by this heat. The electron beam 16 is controlled by the first electrode 110 which is a control electrode, is accelerated by the second electrode 120 which is an acceleration electrode, and the fifth electrode 150 which is an electrode serving as a main lens. The electron beam 16 passing through the sixth electrode 160 and passing through the electrode passes through a shadow mask 18 having a plurality of minute slots 18a formed therein, and a fluorescent surface 11 coated with phosphors on an inner surface of the panel 13. ) To emit light.

The prior art will be described with reference to FIGS. 3A and 3B showing a state in which a tab is welded to a tab connection part formed on the electrode plate, and FIG. 3C showing a state in which the tab is welded to the electrode plate itself.

The tab connecting portions 122 and 142 and the electrode plates 121 and 141 formed on the electrode plates 121 and 141 have the same thickness, or do not form separate tab connecting portions 122 and 142. The electrode structure of the CRT electron gun formed by connecting the tab 70 to any one of the plates 141.

The electrodes 110, 120, 130, 140, 150 and 160 made as described above are connected to the stem pin 61 by the tab 70 as follows.

In the manufacture of the electron gun 17, the tabs 70 welded and connected to the respective electrodes 110, 120, 130, 140, 150 and 160 to apply different voltages are different from the other tabs. In order to prevent mutual interference and mutual interference with other electrodes of the forming process as follows and welded to the step pin (61).

The tab 70 is tensioned toward the stem 60 to be properly shaped, and the properly shaped tab 70 is welded and connected to the stem pin 61 installed on the stem 60.

However, the prior art has the following problems.

In the shaping operation, tensile force is concentrated on the tab connecting portions 122 and 142 of the electrode to which the tab 70 is connected, so that the tab connecting portion is inclined toward the stem 60, and the electrodes 110 are arranged in a straight line at regular intervals. The intervals of 120, 130, 140, 150, and 160 are not constant.

Therefore, the spacing of the electrodes on which the electron beam passing holes 123 and 143 are formed is not constant, causing a difference in characteristics between the three electron beams 16, that is, a deviation between the electron beams 16, resulting in deterioration of resolution. Is holding.

The present invention has been made to solve the above-mentioned conventional problems, and the object of the present invention is to prevent the inclination of the electrode by the tensile force when the tab welded to the electrode is improved toward the stem by improving the electrode structure of the CRT electron gun. have.

1 is a longitudinal cross-sectional view showing the configuration of a typical CRT.

2 is a block diagram of a general electron gun.

Figure 3a is a perspective view showing the structure of the tab connection of the second electrode tab welded according to the prior art.

Figure 3b is a perspective view showing the tab connection portion structure of the fourth electrode welded tab according to the prior art.

Figure 3c is another embodiment showing the electrode plate structure of the fourth electrode welded tab according to the prior art.

Figure 4a is a first embodiment showing the structure of the tab connection portion of the second electrode tab welded according to the present invention.

Figure 4b is a first embodiment showing the structure of the tab connection portion of the fourth electrode welded tab according to the present invention.

Figure 5 is a second embodiment showing the structure of the tab connection portion of the fourth electrode welded tab according to the present invention.

Figure 6 is a third embodiment showing the structure of the tab connection portion of the fourth electrode welded tab according to the present invention.

Explanation of symbols for main parts of the drawings

220: second electrode 240: fourth electrode

221 and 241: electrode plates 222 and 242: tab connection

223 and 243: electron beam passing hole 244: boundary groove

245: isolation

A first embodiment of the present invention for achieving the above object is an electrode structure of a CRT electron gun made by making the thickness of the tab connection portion formed in the electrode plate thinner than the thickness of the electrode plate.

The second embodiment is an electrode structure of a CRT electron gun formed by forming a boundary groove at a boundary between a tab connection portion formed on an electrode plate and an electrode plate.

The third embodiment is an electrode structure of an electron gun for a CRT, which is formed by isolating a portion of a tab connecting portion formed on an electrode plate and an electrode plate.

The electrode structure of the CRT electron gun made as described above is an electrode structure of the CRT electron gun for preventing the electrode from inclining toward the tab connection portion by a tensile force when the tab welded to the stem of the electrode is pulled toward the stem.

Hereinafter, with reference to the accompanying Figures 4a to 6 to describe the contents in more detail as follows.

Figure 4a is a first embodiment showing the structure of the tab connection of the second electrode tab welded according to the present invention, Figure 4b is a first embodiment showing the structure of the tab connection part of the fourth electrode welded tab according to the present invention 5 is a second embodiment showing the structure of the tab connection portion of the fourth electrode welded tab according to the present invention, Figure 6 is a third showing the structure of the tab connection portion of the fourth electrode welded tab according to the present invention Example.

4A and 4B have a structure in which the thickness of the tab connecting portions 222 and 242 formed in the electrode plates 221 and 241 is thinner than that of the electrode plates 221 and 241. The electrode structure of the CRT electron gun.

The electrode structure, after welding the tab 70 to the tab connecting portion 222, 242 formed on the electrode plate to apply a different voltage to each electrode when connecting the tab 70 to the stem pin 61 The tab 70 is stretched toward the stem 60 to be welded to the step pin 61 to prevent mutual interference with the installed tabs 70 and mutual interference between the tabs 70 and the electrodes. .

Due to the tensile force of the tab 70 is tensioned as described above, the tab connecting portion 222, 242 side of the electrode is inclined toward the stem 60, the electrode 220, 240 is tilted to one side as a whole. .

Therefore, the electrode structure of the present invention is generated when the tab 70 is stretched to prevent the electrodes 220 and 240 formed with the electron beam passing holes 223 and 243 and the tab connecting portions 222 and 242 from being tilted as a whole. It is an electrode structure of the CRT gun so that the tensile force is applied only to the tab connection portion 222, 242 of the electrode to prevent the tilt of the entire electrode 220, 240.

The electrode structure will be described in more detail as follows.

When the thickness of the tab connection portions 222 and 242 formed on the electrode plate is made thinner than the thickness of the electrode plates 221 and 241, the electrodes 220 and 240 are inclined by the tensile force generated when the tab 70 is stretched. Since the thickness of the tab connecting portions 222 and 242 formed on the electrode plate may be about 1/2 of the thickness of the electrode plates 221 and 241, it is most ideal.

On the other hand, if the thickness of the tab connection portion 222, 242 formed on the electrode plate is thicker than 2/3 to the thickness of the electrode plate 221, 241, the thinning effect is halved and occurs when the tab 70 is tensioned Since the tensile force is transmitted to the electrode plates 221 and 241, the electrodes 220 and 240 are inclined.

In addition, when the thickness of the tab connection portions 222 and 242 formed on the electrode plate is thinner than 1/3 of the thickness of the electrode plate, the mechanical strength of the tab connection portions 222 and 242 formed on the electrode plate is very weak. Therefore, even if only a small force is applied, since the tab connection portions 222 and 242 formed on the electrode plate are variable, the tab 70 is also changed accordingly, which may cause mutual interference with other electrodes 220 and 240.

Therefore, the thickness of the tab connection portion 222, 242 formed in the electrode plate is effective when the thickness is between 1/3 and 2/3 with respect to the thickness of the electrode plate 221, 241, the electrode plate 221 ( Ideally, ½ for the thickness of 241).

The structure of the electrode made as described above functions as follows.

When the tab 70 welded to the tab connecting portions 222 and 242 formed on the electrode plate at the time of manufacturing the electron gun 17 is tensioned toward the stem 60 so as not to interfere with other electrodes 220 and 240, The generated tensile force does not affect the electrode plates 221 and 241 in which the electron beam passing holes 223 and 243 are formed, and only the tab connection portions 222 and 242 formed in the electrode plate are inclined toward the stem 60. Not only can tabs 70 be formed without mutual interference with other electrodes 220, 240, but also tab connections formed on the electrode plate for the tensile force generated when the tabs 70 are pulled toward the stem 60. Since the 222 and 242 are absorbed, the electrode plates 221 and 241 in which the electron beam passing holes 223 and 243 are formed are not affected at all.

In addition, the same electrode structure as the first embodiment is applied to all electrode structures of the CRT electron gun.

Referring to FIG. 5, which shows a second embodiment of the electrode structure different from the above, is as follows.

It is an electrode structure of a CRT electron gun in which boundary grooves 244 are formed between the tab connecting portion 242 and the electrode plate 241 formed on the electrode plate.

The electrode structure functions the same as in the first embodiment as follows.

By absorbing the force acting on the tab connection portion 242, the boundary groove is prevented from being transferred to the electrode plate 241, thereby preventing the electrode plate 241 from being displaced.

In addition, the same electrode structure as the second embodiment is applied to all electrodes of the CRT electron gun.

6, which shows a third embodiment of the electrode structure different from the above, is as follows.

It is an electrode structure of the CRT electron gun in which the tab connection portion 242 formed on the electrode plate and the electrode plate 241 are separated from each other to form the isolation portion 245.

The electrode structure functions the same as in the first embodiment as follows.

By absorbing the force acting on the tab connection portion 242, the force is prevented from being transferred to the electrode plate 241, thereby preventing the electrode plate 241 from being displaced.

Additionally, the electrode structure as in the third embodiment is applied to all electrodes of the CRT electron gun.

It is possible to solve the inclination of the electrode to improve the resolution of the CRT, to solve the inclination of the electrode and at the same time to solve the problem of shaping of the tab, thereby eliminating the mutual interference of the tabs and the mutual interference of the electrodes by the tab. Defects can be significantly reduced.

In addition, workability and productivity are improved because the electrode does not need to be inclined separately.

Claims (4)

A stem for applying a voltage to the electrode, a stem pin provided on the stem, an electrode plate having an electron beam through hole formed thereon, a tab connection portion formed on the electrode plate, an electrode consisting of the electrode plate and the tab connection portion, the electrode and stem pin In the tab consisting of the connection, The thickness of the tab connection portion formed in the electrode plate is thinner than the thickness of the electrode plate so that the force acting on the tab connection portion is absorbed in the tab connection portion electrode structure of the electron gun for the CRT. The method of claim 1, The thickness of the tab connection portion formed on the electrode plate is compared to the thickness of the electrode plate. Greater than Electrode structure of the CRT electron gun characterized by being smaller than. A stem for applying a voltage to the electrode, a stem pin provided on the stem, an electrode plate having an electron beam through hole formed thereon, a tab connection portion formed on the electrode plate, an electrode consisting of the electrode plate and the tab connection portion, the electrode and stem pin In the tab consisting of the connection, Electrode structure of the electron gun for the CRT tube, characterized in that the tab groove formed in the electrode plate and the boundary between the electrode plate to form a boundary groove so that the force acting on the tab connection portion is absorbed in the boundary groove. A stem for applying a voltage to the electrode, a stem pin provided on the stem, an electrode plate having an electron beam through hole formed thereon, a tab connection portion formed on the electrode plate, an electrode consisting of the electrode plate and the tab connection portion, the electrode and stem pin In the tab consisting of the connection, Electrode structure of the electron gun for a CRT tube, characterized in that the tab connecting portion formed in the electrode plate and the electrode plate is separated by a predetermined portion so that the force acting on the tab connection portion is absorbed in the isolation portion.