KR20040009088A - Electrode and electron gun for color cathode ray tube - Google Patents

Abstract

PURPOSE: An electrode of an electron gun and an electron gun for color cathode ray tube using the electrode are provided to smooth radiation of a gas generating from an electron radiation of a cathode, to improve an assembling characteristic of an electron gun, and to minimize a modification of an electrode. CONSTITUTION: An electrode of an electron gun for color cathode ray tube comprises a can shaped first electrode unit(61) and a second electrode unit(65). The first electrode unit includes a first plane part(62) having a long hole(62a) and at least one combining part for assembling an electrode at an edge of the long hole, and an extension part extended from the edge of the first plane part. The second electrode unit includes a second plane part(66) coupled to the first plane part and having a coupling hole at corresponding position about an electron beam through holes and the coupling part and a bending part(67) coupled to the first electrode unit in such a manner that the bending part is bent toward the first electrode unit from a long side edge of the second plane part.

Description

Electrode of electron gun and electron gun for color cathode ray tube using same

The present invention relates to an electrode of an electron gun for a color cathode ray tube and an electron gun using the same, and more particularly, to an electron gun for a color cathode ray tube having an improved structure of a control electrode.

In general, an electron gun for a color cathode ray tube is used to emit an electron beam to excite a phosphor installed at the neck portion of the cathode ray tube. The cathode emits an electron beam, and a plurality of electrodes spaced apart from the cathode at a predetermined interval. And bead glass fixing the cathode and the electrodes.

The control electrode of the electrodes constituting the electron gun must maintain a predetermined design value to form a cathode lens for focusing the electron beam, the diameter of the electron beam passing hole and the thickness of the periphery, which is relatively very thin. On the other hand, the control electrode and the screen electrode close to the cathode of the electrode is composed of a plate-like electrode, so that the mechanical stress and thermal stress when fixing to bead glass or assembly for fixing, and when the completed electron gun is used in the cathode ray tube Since it is thermally stressed by the electron beam, it must have mechanical strength in consideration of this.

If the thickness of the beam through hole is not formed according to the design value due to mechanical stress, thermal stress and other factors applied to the electrode, it will cause distortion of the electron lens formed by the deformed electrode and further distortion of the entire beam path. This results in deterioration of the quality of the cathode ray tube.

Therefore, in fabricating the electrode of the electron gun, the main surface of the through hole of the electron beam must be generally matched to a very thin design value, and on the contrary, a portion other than the main surface of the beam through hole must maintain a thickness above a predetermined value to maintain mechanical strength. The contrary requirements must be met. In particular, the control electrode adjacent to the cathode of the electrodes is inserted into the electrodes on the side facing the cathode during assembly, the control electrode is inserted into the shortest end of the support rod and the electron beam through the formed on the control electrode There was a problem that the assembly of the ball diameter is very small.

US Patent No. 5,767,615 discloses an electron gun for cathode ray tubes. This electron gun discloses a coupling relationship between a retainer and a control electrode. The control electrode has a structure of a rim electrode.

U. S. Patent No. 5,295, 887 discloses an apparatus for maintaining a gap between a cathode and a control electrode. The control electrode adjacent to the cathode of the disclosed electron gun has a structure of a rim electrode and has a structure in which a support embedded in a bead glass is installed on an outer circumferential surface of the rim electrode. And the electron beam through hole of each electrode constituting the electron gun is supported by the inner and outer support rods coupled in the longitudinal direction. Since the support is provided on the outer circumferential surface of the rim electrode adjacent to the portion where the electron beam through hole is formed, there is a problem that the electron beam through hole portion is deformed when the support is embedded in the bead glass.

1 and 2 show a plan view and a cross-sectional view of a cup type electrode used as a control electrode of an electron gun.

Referring to the drawings, the cup-shaped electrode has a flat portion 21 and a side portion 22 extending from the flat portion 21 in the shape of a cup. The buried portion 23 extends from the side portion 22 and has a shape as shown in the figure. The buried portion 23 is a portion embedded in the bead glass when assembling a plurality of electrodes to make an electron gun. The planar portion 21 is formed with the electron beam through-holes 24 arranged in a straight line, the uneven portion 23 is formed on the main surface of the electron beam through-hole 24. Thermal electrons emitted from the cathode 2 of FIG. 1 pass through the electron beam through hole 24.

The uneven portion 23 formed on the main surface of the electron beam passing hole 24 has a function of preventing mechanical force and thermal expansion transmitted through the electrode itself. That is, the force applied when the buried portion 25 is buried in the bead glass (not shown) in the frit state, and the expansion of the electron beam through the heat generated by the heater (not shown) of the cathode assembly of the electron gun ( It buffers the change of the position of 24). On the other hand, the gas discharge hole 27 is formed in the flat portion 21, which is for discharging the gas generated from the cathode during the aging process of the electron gun. However, since the can-type electrode communicates with the inside and only through the gas discharge hole 27, the can-type electrode has a problem that gas discharge is not performed smoothly.

The present invention is to solve the above problems, to facilitate the emission of gas generated from the electron emission of the cathode, can improve the assembly characteristics when assembling the electron gun for color cathode ray tube can minimize the deformation of the electrode The object is to provide an electrode of the electron gun and an electron gun using the same.

1 is a plan view showing a control electrode of a conventional electron gun,

2 is a cross-sectional view of the control electrode shown in FIG.

3 is a sectional view of an electron gun according to the invention;

4 is an exploded perspective view of a control electrode according to the present invention;

5 is a cross-sectional view of the control electrode,

In order to achieve the above object, the present invention provides a can-shaped first hole having a first flat portion having a long hole formed therein and having at least one joining portion drawn in for assembly of an electrode at an edge of the long hole, and having an extension extending from an edge of the flat portion. An electrode member,

The first flat surface is bent from the long side edge of the second flat portion and the second flat portion to which the coupling holes are formed at positions corresponding to the electron beam passing holes and the coupling portion. Characterized in that it comprises a second electrode member coupled to the electrode member.

In the present invention, the short side portion of the second electrode member coupled to the first electrode member is spaced apart from the first plane portion of the first electrode member by a predetermined distance. The first and second buried portions for fixing the electrode to the bead glass are formed at at least one side of the extension portion and the outer peripheral surface of the extension portion. The second buried portion may be manufactured as a separate member and attached to the outer circumferential surface of the extension portion, and the extension portion may be formed by lancing.

Electron gun for the color cathode ray tube according to the present invention for achieving the above object is bead glass extending in parallel with each other;

The can-shaped first electrode member, which is supported on the bead glasses, has a first hole having a first hole formed at an edge thereof and having at least one joining portion for assembling the electrode at the edge of the hole. And a second plane portion which is coupled to the first electrode member and formed with electron beam passing holes and coupling holes corresponding to the coupling portion, and is bent toward the first electrode member side from a long side edge of the first plane portion. A control electrode including a second electrode member coupled to the electrode member;

A cathode assembly installed inside the first electrode member;

And a screen electrode, at least one focus electrode, and a final acceleration electrode sequentially installed from the control electrode.

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

3 and 4 show an example of an electron gun for a color cathode ray tube according to the present invention.

Referring to the drawings, a color cathode ray tube electron gun 50 according to the present invention comprises a cathode assembly 51 for emitting an electron beam, a control electrode 60 in which the cathode assembly 51 is installed, and the control It includes a string electrode 52 and a plurality of focusing electrodes 53 and a pair of bead glass 54 for holding and holding the electrodes sequentially from the electrode 60. The number of the focusing electrodes 53 is not limited by the above-described embodiment and can be variously changed according to the design state of the electron lens for focusing the electron beam. For example, at least two or more electrodes must be provided in order to form a universal lens or bipotential lens for focusing an electron beam in multiple stages.

Meanwhile, the control electrode 60 in which the cathode assembly 51 is installed is coupled to the first electrode member 61 and the first electrode member 61 in which the cathode assembly 51 is installed therein. It consists of the 2nd electrode member 65 in which the electron beam through-hole B was formed.

The first electrode member 61 may include a first planar part 62 and an extension part 63 extending from the first planar part 62 in a direction perpendicular to the first planar part 62. The long hole 62a is formed in 62 in the longitudinal direction. Coupling portions 64 and 64 ′ are formed at the opposite edges of the long hole 62a to assemble the electrodes in the bead glass 54. Here, the coupling portions 64 and 64 'are not limited to being drawn from the edge of the long hole 62a but may be formed through the first flat portion. In this case, the diameter is preferably larger than the diameter of the electron beam through hole.

The second electrode member 65 coupled to the first electrode member 61 has a plate shape, and includes a second flat portion 66 having three electron beam through holes B, and a long side of the second flat portion. A bending portion 67 is bent from the edge toward the first flat portion 62 of the first electrode member 61 and coupled to the first electrode member 61. The bending portion 67 is formed by extending from the edge of the long side of the second flat portion 66 of the second electrode member. In addition, coupling holes 68 and 68 'are formed in the second plane portion 66, and the coupling holes 968 and 68' are formed at positions corresponding to the coupling portions 64 and 64 '. .

Meanwhile, first and second buried portions 71 and 75 which are immersed in the bead glass 54 to support the control electrode 60 are formed in the first electrode member 61. As shown in FIGS. 4 and 5, 71 is formed to extend outwardly at an end portion of the extension portion 63 of the first electrode member 61, and in the center portion thereof to increase the bearing force when the bead glass 54 is embedded. An inlet portion 72 cut inwardly is formed. The second buried portion 75 is provided on an outer circumferential surface of the extension portion 63, and the second buried portion 75 is formed by attaching a separate member or formed by lancing the extension portion 63. Can be.

The electrode of the electron gun according to the present invention configured as described above and the electron gun for the color cathode ray tube using the same are made of the first and second electrode members 61 and 65 coupled to the control electrode 60, and the first electrode. Since the short side portion of the second electrode member 65 fixed to the member 61 is opened to be spaced apart from the first electrode member 61, the gas generated during the aging process of the cathode assembly installed inside the first electrode member 61. Can be released smoothly.

In addition, coupling portions 64, 64 'and coupling holes 68, 68' are respectively formed in the first and second electrode members 61 and 65, respectively, in assembling the electron gun or in the first and second electrode members. In the assembly of the electrode support rod as shown in Figure 4 as shown in the dotted line can improve the assembly precision of the electrode and the assembly precision of the electron gun. In particular, it is possible to reduce the damage of the electron beam through hole (B) as compared to the conventional assembly method of coupling the support rod to the electron beam through hole formed in the control electrode.

In addition, since the buried part embedded in the bead glass 54 is not formed in the electrode member 61, the first electrode member 61 may be formed in the bead glass 54 when the electrodes are fixed by the bead glass 54. The deformation by the pressing force can be prevented.

Electrode of the electron gun according to the present invention and the electron gun for the color cathode ray tube using the same can minimize the deformation of the first electrode member formed with the electron beam through hole during the manufacturing process, it is possible to facilitate the release of gas during aging. In addition, the productivity of the first and second electrode members can be improved by improving the assembly properties of the first and second electrode members.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, which are illustrative and can 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 appended claims.

Claims (6)

A can-shaped first electrode member having a first hole having a long hole formed therein and having at least one joining portion drawn in for assembly of the electrode at an edge of the long hole and having an extension extending from an edge of the plane portion; A second plane portion coupled to the first electrode member and having coupling holes formed at positions corresponding to the electron beam passing holes and the coupling portion, and bent toward the first electrode member from a long side edge of the second plane portion; The electrode of the electron gun for a color cathode ray tube, characterized in that it comprises a second electrode member having a bending portion coupled to the first electrode member. The method of claim 1, The short side portion of the second electrode member coupled to the first electrode member is an electrode of the electron gun for a color cathode ray tube, characterized in that spaced apart from the first plane portion of the first electrode member. The method of claim 1, Electrode of the electron gun for a color cathode ray tube, characterized in that the buried portion for fixing the electrode to the bead glass on at least one side of the end of the extension and the outer peripheral surface of the extension. Bead glasses extending in parallel with each other; The can-shaped first electrode member, which is supported on the bead glasses, has a first hole having a first hole formed at an edge thereof and having at least one joining portion for assembling the electrode at the edge of the hole. And a second plane portion which is coupled to the first electrode member and formed with electron beam passing holes and coupling holes corresponding to the coupling portion, and is bent toward the first electrode member side from a long side edge of the first plane portion. A control electrode including a second electrode member having a bending portion coupled with the control electrode; A cathode assembly installed inside the first electrode member; And a screen electrode, at least one focus electrode, and a final acceleration electrode sequentially installed from the control electrode. The method of claim 4, wherein The short side portion of the second electrode member coupled to the first electrode member is an electrode of the electron gun for a color cathode ray tube, characterized in that spaced apart from the first plane portion of the first electrode member. The method of claim 4, wherein Electrode of the electron gun for a color cathode ray tube, characterized in that the buried portion for fixing the electrode to the bead glass on at least one side of the end of the extension and the outer peripheral surface of the extension.