KR100852105B1 - Electron gun for color cathode-ray tube - Google Patents

Abstract

The electron gun for a color cathode ray tube according to the present invention includes a cathode for emitting a plurality of electron beams, a control electrode facing the cathode, at least three electron beam passing holes being formed in the transverse direction, At least one of a control electrode and a screen electrode is provided on at least one of a control electrode and a screen electrode, and at least one of a control electrode and a screen electrode is provided on at least one of a control electrode and a screen electrode, A bead portion formed to be curved along the transverse direction at an adjacent portion of the embedding fixture so as to absorb a deformation amount generated upon fusion to the bead glass or to reduce heat deformation from the heater in the cavity, At least one of the medial long sides has a curvature.

Description

[0001] The present invention relates to an electron gun for color cathode ray tube

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side cross-sectional view showing the structure of an electron gun in a conventional color cathode ray tube. FIG.

FIG. 2 is a perspective view showing an embodiment of a triode portion in the electron gun according to the present invention. FIG.

3 is a perspective view illustrating a control electrode according to a first embodiment of the present invention;

4 is a perspective view showing a control electrode according to a second embodiment of the present invention;

5 is a perspective view illustrating a control electrode according to a third embodiment of the present invention.

6 is a perspective view illustrating a control electrode according to a fourth embodiment of the present invention;

7 is a perspective view illustrating a control electrode according to a fifth embodiment of the present invention;

8 is a perspective view showing a control electrode according to a sixth embodiment of the present invention.

9 is a perspective view showing a control electrode according to a seventh embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

21 .. Cassoda 22, 31, 41, 51, 61, 71,

23. Screen electrode 31, 42, 52, 62, 63, 72, 82,

73, 83,

The present invention relates to an electron gun for a color cathode ray tube, and more particularly, to an electron gun for a color cathode ray tube having an improved structure for absorbing a deformation amount generated when an electrode is fused to a bead glass and reducing heat deformation from a heater in a cathode. It relates to the electron gun.

Generally, a color cathode ray tube has a funnel formed by integrally forming a neck portion on a panel, and firing three electron beams of red (R), green (G), and blue (B) And an inner surface of the panel is coated with a fluorescent film that emits light as the electron beam impinges on the inner surface of the panel. The deflection yoke is fixed to the panel along the outer periphery of the neck portion to deflect the electron beam emitted from the electron gun.

FIG. 1 is a side view showing the construction of an electron gun in such a color cathode ray tube. FIG. 1 shows three cathodes 1 for mounting a heater 1a therein to emit thermions in accordance with an input electrical signal, A screen electrode 3 as an accelerating electrode for accelerating and accelerating an electron beam gathered on the surface of the cathode 1, a plurality of electrodes 3 for accelerating and finely focusing the electron beam, The focusing electrodes 4 and the final accelerating electrode 5 provided adjacent to the focusing electrode 4 and forming the main lens are sequentially arranged and fixed by the bead glass 6. [

That is, in each electrode, buried and fixed portions are formed at both ends in the transverse direction, and these buried and secured portions are embedded in the bead glass and fused. When the electrodes are fused to the bead glass, the electrodes may be deformed by fusing heat. In operation of the electron gun, deformation of the electrodes may be caused by the heat of the heater installed in the cathode. In particular, since the control electrode and the screen electrode are formed in a plate shape, they may be vulnerable to thermal deformation.

When the electrodes are deformed, the peripheral electron beam passing holes move outward with respect to the through holes positioned at the center of the electrodes, thereby causing a thermal convergence drift phenomenon in which the path of the electron beam is varied. Further, as the distance between the cathode and the control electrode is changed, a deviation of the cutoff voltage is generated, so that the white balance characteristic may deteriorate.

In order to solve the above problems, Korean Patent Laid-Open Publication No. 2000-0009417 discloses an electron gun for a color cathode ray tube which reduces thermal expansion of an electrode. The disclosed electron gun has concave and convex portions formed in the vicinities of at least one of the electron beam through holes among the G1 electrode, the G2 electrode, and the G3 electrode to increase the intensity of heat from the heater in the cathode and to reduce thermal deformation.

Japanese Unexamined Patent Application Publication No. 6-84481 discloses an electron gun bulb for a color cathode ray tube. In the disclosed electron gun, at least one of the control electrode and the accelerating electrode embeds the tip end of the buried anchoring portion embedded in the multi-foam glass so as to be inclined in the displacement direction due to thermal deformation in the tube axis direction, And reduces variations in the distance between the electrodes due to an external impact.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a plasma display panel in which at least one of a control electrode and a screen electrode is formed with a curved beading portion at a portion adjacent to a buried / It is an object of the present invention to provide an electron gun for a color cathode-ray tube capable of absorbing a deformation amount generated in an electrode when fused to a bead glass or reducing heat deformation from a heater in a cathode.

According to an aspect of the present invention, there is provided an electron gun for a color cathode ray tube comprising: cathodes for emitting a plurality of electron beams; at least three electron beam passing holes facing the cathode; 1. An electron gun for a color cathode ray tube in which a control electrode, a screen electrode, a focusing electrode and a final accelerating electrode, both ends of which are embedded and fixed, are sequentially embedded in a bead glass and fused,

Wherein at least one of the control electrode and the screen electrode absorbs a deformation amount generated when at least one of the control electrode and the screen electrode is fused to the bead glass or reduces deformation due to heat from the heater in the canode And at least one of an outer long side and an inner long side of the beading portion has a curvature. The bead portion may be curved along a transverse direction at an adjacent portion of the embedded fixture.

Further, in the present invention, a piercing portion formed between the beading portion and the electron beam passing hole is further provided.

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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In a color cathode ray tube, an electron gun is provided at a neck portion of a cathode ray tube to emit an electron beam for exciting a fluorescent film. The electron gun includes a cathode, a control electrode and a screen electrode constituting a triode portion, And a final accelerating electrode forming a main lens.

FIG. 2 shows an embodiment of a triode portion for forming an electron beam emission and a product point, and FIG. 3 is a drawing showing only a control electrode according to the first embodiment in FIG.

2 and 3, the three cathodes 21 constituting the three-pole portion include an electron emitting portion 21a impregnated or coated with an electron emitting material and a heater 21b for heating the electron emitting portion 21a ).

The control electrode 22 disposed adjacent to the cathode 21 is formed in a plate shape and first electron beam passage holes 22a are formed at positions corresponding to the respective cathodes 21 in a plane. The control electrode 22 controls the electron beams emitted from the cathodes 21, respectively.

A buried and fixed portion 22b is formed on both sides of the control electrode 22. The buried and fixed portion 22b is formed by bidding along the same lateral direction as the direction in which the first electron beam passing holes 22a are arranged, (31) are formed. That is, since the upper surface of the control electrode 22 shown in the drawing shows the incidence side, the beading portion 31 is formed to protrude from the incidence side of the control electrode 22, and is formed to be drawn into the emergence side surface.

The curved portion of the outer long side of the beading portion 31 located outside the control electrode 22 is curved toward the inside of the control electrode 22, Is smaller than the curvature of the inner long side of the beading portion (31). Therefore, the width of the beading portion 31 gradually increases from both ends of the beading portion 31 to the center, and the width at the center becomes the maximum.

When the control electrode 22 is welded to the bead glass 6 (see FIG. 1) or when the heater 21a is operated, the beading portion 31 formed on the control electrode 22, as described above, (22), the amount of thermal expansion of the control electrode (22) is absorbed. In particular, the amount of deformation in the longitudinal direction of the control electrode 22 can be sufficiently absorbed. As a result, the occurrence of the thermal convergence drift phenomenon can be minimized. In addition, the interval between the cathode 21 and the control electrode 22 can be kept constant, and the occurrence of the deviation of the cutoff voltage can be prevented.

The screen electrode 23 is in the form of a plate and the cathode 21 and the first electron beam passage hole 22a are formed on the plane. And second electron beam passing holes 23a are formed coaxially with the first electron beam passing holes 23a. The shapes of the first and second electron beam passing holes 22a and 23a are not limited to those shown in the drawings. Also, the screen electrode 23 may be equally applied to the beading portion 31 formed on the control electrode 22. This also applies to the following embodiments.

Meanwhile, the shape of the beading portion 31 formed on the control electrode 22 can be variously modified, and embodiments thereof are shown in FIGS. 4 to 6. FIG.

First, in the control electrode 41 according to the second embodiment shown in Fig. 4, the beading portion 42 is formed along the lateral direction of the control electrode 41, as in the above-described embodiment. The beading portion 42 protrudes from the incident surface side of the control electrode 41 and is formed to be drawn into the outgoing side surface. This also applies to the following embodiment.

Both sides of the long side of the beading portion 42 are curved to the outside of the control electrode 41. The curvature of the outer long side and the curvature of the inner long side of the beading portion 42 are the same. Therefore, the beading portion 42 has a uniform width.

The control electrode 51 according to the third embodiment shown in Fig. 5 is different in the curved directions of both sides of the long side of the beading portion 52, And the inner long side of the beading portion 52 is curved inward of the control electrode 51. [ The width of the beading portion 52 increases from both ends toward the center, and the width at the center becomes the maximum.                     

In the control electrode 61 according to the fourth embodiment shown in Fig. 6, a beading portion 62 similar to the above-described embodiments is formed along the lateral direction around the embedded fixing portion. The beading portion 62 is formed with an auxiliary beading portion which intersects in a substantially vertical direction.

Two of the auxiliary beading portions 63 are formed to correspond to the positions between the first electron beam passing holes 61a. The beading portion 62 and the auxiliary beading portion 63 reduce the deformation of the control electrode 61 in the longitudinal direction and in the transverse direction, respectively. Meanwhile, the auxiliary beading portion 63 may have various shapes as in the above-described embodiments.

7 shows a control electrode according to the fifth embodiment.

As shown in the drawing, in the control electrode 71, a beading portion 72 is formed along the lateral direction at a portion adjacent to the embedded fixing portion 71b formed on both sides. The shape of the beading portion 72 may have the same width in a straight line as shown in the drawing, but it is not limited thereto, and may be a curved shape as in the above-described embodiments.

A piercing portion 73 is formed between the beading portion 72 formed on the control electrode 71 and the first electron beam passing hole 71a along the transverse direction. The piercing portion 73 may be pierced through a piercing process.

The control electrode 81 according to the sixth embodiment shown in FIG. 8 is formed with a longitudinal piercing portion 83 between the beading portion 82 and the first electron beam passing hole 81a . Two piercing portions 83 may be formed to correspond to the first electron beam passing holes 81a.

9, the piercing portion includes first and second piercing portions 93 (first and second piercing portions) formed between the beading portion 92 and the first electron beam passing holes 91a 94). The first piercing portion 93 is formed in a transverse direction, and the second piercing portion 94 is formed in a longitudinal direction to intersect with the first piercing portion 93. Two of the second piercing portions 94 may be formed to correspond to the first electron beam passing holes 91a.

The first and second piercing portions 93 and 94 can reduce the deformation of the control electrode 91 in the longitudinal direction and in the transverse direction, respectively.

The piercing portions 72, 82, 93 and 94 may be applied to the control electrodes 71, 81 and 91 as well as the screen electrode 23.

The piercing portion formed on the control electrode plays a role of absorbing the thermal expansion amount of the control electrode when the control electrode is fused to the bead glass or when the heat is transferred to the control electrode by the operation of the heater do. Therefore, the occurrence of the thermal convergence drift phenomenon can be minimized, and the occurrence of the deviation of the cutoff voltage can be prevented.

As described above, when at least one of the control electrode and the screen electrode forms a curved beading portion in an adjacent portion of the embedded fixing portion, or a pierced portion is formed between the beading portion and the electron beam passing hole, when the electrode is fused to the bead glass It is possible to absorb a deformation amount generated in the electrode or to reduce deformation due to heat from the heater in the cathode.

Therefore, it is possible to prevent the thermal convergence drift phenomenon from occurring due to thermal deformation of the electrodes, to improve the quality of the screen, to prevent the deviation of the cutoff voltage, and to improve the white balance characteristic.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

Claims (11)

A control electrode which is opposed to the cathode and in which at least three electron beam passing holes are formed in the transverse direction and in which burying and fixing parts are formed at both ends of the transverse direction, a screen electrode, a focusing electrode, and a final acceleration An electron gun for a color cathode-ray tube in which electrodes are sequentially embedded in a bead glass at regular intervals and fused, Wherein at least one of the control electrode and the screen electrode absorbs a deformation amount generated when at least one of the control electrode and the screen electrode is fused to the bead glass or reduces deformation due to heat from the heater in the canode And a beading portion formed to be curved along the transverse direction at an adjacent portion of the embedding fixing portion, Wherein at least one of an outer long side and an inner long side of the beading portion has a curvature. The method according to claim 1, Wherein the beading portion is formed to protrude from the incident side surface of at least one of the control electrode and the screen electrode and is formed to be drawn into the emitting side surface. The method according to claim 1, Wherein a width of the beading portion gradually increases from both ends to a center of the bead portion, wherein the curved portion of the outer long side is smaller than the curvature of the inner long side of the at least one electrode of the control electrode and the screen electrode, Electron gun for color cathode ray tube. The method according to claim 1, Wherein the width of the beading portion is uniform in both the long sides of the beading portion curved outwardly of at least one of the control electrode and the screen electrode with the same curvature. The method according to claim 1, Wherein an outer long side of the beading portion is curved to the outside of at least one of the control electrode and the screen electrode and an inner long side is curved inward of at least one of the control electrode and the screen electrode, To the center of the electron gun. 6. The method according to any one of claims 1 to 5, Further comprising an auxiliary beading portion intersecting the beading portion and correspondingly formed between the electron beam passage holes. The method according to claim 6, Wherein the auxiliary beading portion is protruded from an incident side surface of at least one of the control electrode and the screen electrode so as to be drawn into the emitting side surface. The method according to claim 1, Further comprising a piercing portion formed between the beading portion and the electron beam passing hole. 9. The method of claim 8, And the piercing portion is formed in a transverse direction. 9. The method of claim 8, And the piercing portion corresponds to the space between the electron beam passing holes and is formed in the longitudinal direction. 9. The method of claim 8, Wherein the piercing portion comprises a first piercing portion formed in a transverse direction and a second piercing portion intersecting the first piercing portion and corresponding to a space between the electron beam passing holes and formed in the longitudinal direction.

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