JPH09288987A - Electron gun structure and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further enhance the accuracy of assembling an electron gun structure having a field emission cold cathode, since variation in the accuracy of assembling a triode part, particularly variation in the assembly of a cold cathode part and a first grid, may adversely affect focusing and brightness characteristics. SOLUTION: A plurality of guide holes 3c are provided in a cold cathode 3b as means for making the center of a cold cathode part 3 and the center of a first grid 4 coincide with an axial centerline, the first grid 4 having a through hole 4a opposed to a through hole 3c in the cold cathode part 3, and a plurality of guide holes 4b in the first grid 4 are opposed to each other. Further, a welding jig used for combining the cold cathode part 3 with the first grid 4 is provided with a guide pin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun assembly having a field emission cold cathode, and more particularly to means for improving the assembly accuracy of a cold cathode portion which is an electron beam generating source and a first grid (control electrode).

[0002]

2. Description of the Related Art Conventionally, various types of electron guns used in televisions and displays are known, but in any case, thermionic electrons emitted from a hot cathode portion (cathode electrode) Beam, first grid, second
An electron beam is focused on a phosphor screen by a grid (accelerating electrode) <hereinafter, these portions are referred to as a triode portion> and a main electron lens after the third grid (focusing electrode).

Of the various characteristics of the color cathode ray tube, poor focus due to the electron gun significantly impairs the image quality of televisions and displays. As described above, the focus characteristic of the color cathode ray tube depends on the variation in the assembly accuracy of the triode. In the electron gun having the hot cathode, variations in the assembly interval between the first grid and the second grid determine the shape of the electron beam and have a great influence on the focus characteristics during assembly of the triode part.

FIG. 6 is a structural view of a main part of a conventional electron gun assembly for a cathode ray tube using a hot cathode as a cathode portion, and FIG. 7 is a partially enlarged sectional view mainly showing a first grid and a hot cathode portion. Is. For example, in the figure, the electron gun assembly 21 is
3, a first grid 24, a second grid 25, a third grid 26, a fourth grid 27, a fifth grid 28, a sixth grid 29 are sequentially arranged, and an electrode support 30 for implanting and supporting these electrodes. Composed. Also, the hot cathode part 2
A portion formed of 3, the first grid 24, and the second grid 25 is called a triode portion 22. The three hot cathodes 23a are arranged in parallel in the hot cathode part 23, and the first grid 2
A through hole 24a for passing the three electron beams emitted from the hot cathode portion 23 is formed at a position facing the hot cathode 23a. The stem 31 has a lead 31 a connected to the hot cathode portion 23 and an exhaust pipe 31 b for exhaust.

As described above, in the electron gun assembly 21 having the hot cathode, the assembly accuracy of the triode section 22, particularly the assembly accuracy of the first grid 24 and the second grid 25 affects the shape of the electron beam. . When the shape of the electron beam is distorted or deformed in this way, the focus characteristics deteriorate.
Therefore, various means have been conventionally taken to improve the assembling accuracy of the triode portion 22 in order to reduce the assembling accuracy, particularly the variation in eccentricity.

[0006]

Recently, a color cathode ray tube using a cold cathode instead of the hot cathode, that is, an electron gun assembly having a field emission cold cathode, coexisting with an electron gun assembly having a hot cathode. There is a movement in the market where is put to practical use. However, as described above, although the assembly accuracy of the triode part affects the shape of the electron beam, the cathode part is changed from the hot cathode to the cold cathode. 3 from the relationship of sex and straightness
Assembling accuracy of the pole part becomes important. In the electron gun assembly having the cold cathode, the assembling accuracy of the triode part, especially the variation in the assembling of the cold cathode part and the first grid, affects the beam eccentricity, and as a result, the focus characteristics and the brightness characteristics are impaired. Become. Therefore, the present invention has been proposed in view of the above problems, and an object of the present invention is to reduce the assembly accuracy of the triode part, particularly the variation in the assembly of the cold cathode part and the first grid. It is an object of the present invention to provide an electron gun structure in which the eccentricity of the electron beam is reduced by improving the assembling accuracy and the focusing characteristics and the brightness characteristics are improved.

[0007]

The present invention has a triode section including an electrode group forming a main electron lens for converging three electron beams on a phosphor screen. In an electron gun structure composed of an electrode supporting body to be held, a means for emitting three electron beams is a cold cathode portion composed of three field emission type cold cathodes arranged on the cold cathode supporting body. There is provided an electron gun assembly having means for aligning a central portion of the portion and a central portion of a first grid having three passage holes facing the cold cathode portion on an axial center line.

The means for aligning with the axial center line are a plurality of guide holes provided in the cold cathode support and a plurality of guide holes provided in the first grid, and these guide holes face each other. To provide an electron gun structure.

Further, the plurality of guide holes provided in the cold cathode support are near the holder portion, and the plurality of guide holes provided in the first grid are near the passage hole and are opposed to each other. Providing a structure.

Further, guide pins are provided in a welding jig for assembling and assembling the cold cathode portion and the first grid, and a plurality of guide holes are provided in the cold cathode support and a plurality of guide holes are provided in the first grid. Provided is a method for manufacturing an electron gun assembly, which comprises:

[0011]

Embodiments of the present invention will be described with reference to the drawings. 1 to 5, 1 is an electron gun assembly, 2 is a triode part, 3 is a cold cathode part, 4 is a first grid, 5 is a second grid, 6 is a second grid, and 7-9.
Is a third to sixth grid, 10 is an electrode support, and 11 is a stem. The triode portion 2 refers to the cold cathode portion 3, the first grid 4 and the second grid. Further, the cold cathode portion 3 is provided in each holder portion 3d of the cold cathode support 3b.
a is mounted and mounted. The stem 11 has a lead 11a connected to the cold cathode portion 3 and an exhaust pipe 11b for exhaust.
have.

FIG. 1 is a structural view of a main part of an electron gun assembly having a cold cathode according to the present invention. As shown in FIG. 1, the electron gun assembly 1 includes a cold cathode portion 3, a first grid 4, a second grid 5, a third grid 6 composed of bottomed dish-shaped electrode elements, a fourth grid 7 and a fifth grid. 8 and 6th grid 9 and the electrode support 1 of the glass material which implants and supports these electrodes 1
Consists of zero. The cold cathode portions 3 are independent of each other corresponding to the three electron beams, but the other electrodes have an integrated electrode structure, and three electron beam passage holes are formed.

FIG. 2 is a partially enlarged sectional view of the electron gun assembly 1 mainly showing the first grid 4 and the cold cathode portion 3 related to the present invention. As shown in FIG. 2, the cold cathode portion 3 has three holder portions 3d provided on the cold cathode supporting body 3b with R,
The cold cathode 3a that emits each of the G and B electron beams is mounted and mounted. In addition, this cold cathode support 3
A plurality of guide holes 3c, which is the main object of the present invention, are formed in b.

On the other hand, the first grid 4 is provided with passage holes 4a corresponding to the three electron beams emitted from the cold cathodes 3a forming the cold cathode portion 3, and the cold cathode support described above is provided. A plurality of guide holes 4b are similarly formed in the body 3b at positions facing the guide holes 3c. Further, the stem 11 has each lead 11a connected to the cold cathode portion 3 and an exhaust pipe 11b for exhaust.

FIG. 3 is an explanatory view of the cold cathode support 3b, which is the main object of the present invention, and shows a plan view and a side view of the cold cathode support 3b. As shown in the figure, a holder portion 3 for mounting and mounting three cold cathodes 3a on the cold cathode support 3b.
A plurality of guide holes 3c are formed in the vicinity of the holder portion 3d as means for disposing d and improving the accuracy of assembly with the first grid 4. This guide hole 3c
Will be used in opposition to a guide hole 4b formed in the vicinity of a passage hole 4a of the first grid 4 which will be described later. If there are at least two, it will be stable, but from the viewpoint of improving the assembly accuracy, 3 It is desirable to have four guide holes 3c.

Next, an assembling and assembling method of the cold cathode portion 3 and the first grid 4 will be described. FIG. 4 shows the cold cathode part 3.
It is a combined assembly explanatory view of the 1st grid 4 with the. For example,
A plurality of guide holes 3c provided in the cold cathode portion 3, that is, the cold cathode support 3b are inserted into the guide pin 12a implanted in the welding jig 12 in a predetermined direction. The guide holes 4b of the first grid 4 are inserted in a similar manner so as to be laminated on the cold cathode portion 3.

As described above, the guide pin 12a provided on the welding jig 12, the guide hole 3c of the cold cathode support 3b, and the first
The guide hole 4b of the grid 4 determines the positional relationship between the cold cathode portion 3 and the first grid 4. After the positional relationship between the cold cathode portion 3 and the first grid 4 is determined, the overlapping edges of the both are welded together, so that highly accurate assembly is possible. That is, as shown in FIG. 5, highly accurate assembly is possible in which the center line of the cold cathode 3a composed of a plurality of emitters 3e and gates 3f and the center line of the passage hole 4a of the first grid 4 are aligned. Become.

[0018]

As described above, according to the electron gun assembly of the present invention and the method of manufacturing the same, a plurality of guide holes are provided in the cathode support and the guide holes of the first grid are utilized. ,
Since the assembly is performed by welding after being inserted into the welding jig provided with the guide pin, the positioning of the cold cathode portion and the first grid is stable and the assembly accuracy is improved. As a result, the center of the tip of the cold cathode and the center of the passage hole of the first grid coincide with the center line in the axial direction, so that the eccentricity of the electron beam disappears and focus characteristics and brightness characteristics, specifically, bleeding and electrode It is possible to provide an electron gun structure in which the collision of the electron beam with the electron beam is reduced.

[Brief description of drawings]

FIG. 1 is a structural diagram of a main part of an electron gun assembly having a cold cathode according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view mainly showing the first grid and cold cathode portion of FIG.

FIG. 3 is an explanatory view of a cold cathode support according to the present invention.

FIG. 4 is an explanatory view of assembly of a cold cathode unit and a first grid according to the present invention.

FIG. 5 is an explanatory diagram showing a center line between a tip of the cold cathode and a passage hole of the first grid.

FIG. 6 is a structural diagram of a main part of a conventional electron gun assembly having a hot cathode.

FIG. 7 is a partially enlarged sectional view mainly showing the first grid and the hot cathode portion of FIG.

[Explanation of symbols]

 1 Electron Gun Structure 2 Triode Part 3 Cold Cathode Part (Cathode Electrode) 3a Cold Cathode 3b Cold Cathode Support 3c Guide Hole 3d Holder Part 3e Emitter 3f Gate 4 First Grid (Control Electrode) 4a Passage Hole 4b Guide Hole 5 2nd grid (accelerating electrode) 6 3rd grid 7 4th grid 8 5th grid 9 6th grid 10 Electrode support 11 Stem 11a Lead 11b Exhaust pipe 12 Welding jig 12a Guide pin

Claims (4)

[Claims] 1. An electron gun assembly comprising: an electrode group including a triode portion including at least a cathode electrode, a control electrode, and an acceleration electrode; and an electrode support body holding these electrodes, wherein the cathode electrode is cold. A cold cathode part composed of three field emission cold cathodes arranged on a cathode support, the center of the cold cathode part and the center of a control electrode having three through holes facing the cold cathode part. An electron gun assembly having means for aligning the portion with an axial centerline. 2. The means for aligning with the axial center line is a plurality of guide holes provided in the cold cathode support and a plurality of guide holes provided in the first control electrode, and these guide holes are provided. The electron gun assembly according to claim 1, which is opposed to each other. 3. A plurality of guide holes provided in the cold cathode support are near a holder portion, and a plurality of guide holes provided in the control electrode are near a passage hole and face each other. The electron gun assembly according to claim 2, wherein 4. A guide pin is provided in a welding jig for assembling and assembling the cold cathode portion and the first grid, and a plurality of guide holes provided in the cold cathode support and a plurality of guide holes provided in the control electrode are provided. 3. The method for manufacturing an electron gun assembly according to claim 1, wherein a guide hole and a guide hole are respectively inserted and positioned in a predetermined direction and then welded.