JPH08222144A - Electron gun structure and assembling method thereof - Google Patents

Abstract

PURPOSE: To provide an electron gun structure for a cathode-ray tube and its assembling method eliminating the resistance welding process by directly burying a hermetic seal supporter supporting a cathode in a glass stanchion with auxiliary support metals. CONSTITUTION: Support metals provided on the electrode side walls of multiple electrodes 1, 2, 3, 4, 5, 6, 7 are buried in a glass stanchion 8 to form an electron gun structure. An auxiliary support metal 11 fixed to a hermetic seal supporter 10 supporting the cathode 1 is buried in the glass stanchion 8. Multiple electrodes including the hermetic seal supporter 10 supporting the cathode 1 are positioned at the prescribed positions by a positioning jig, then the electrodes are buried in the glass stanchion 8.

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 for a cathode ray tube, and more particularly to an electron gun assembly which simplifies the assembly structure of a hermetic seal support for supporting a cathode and improves the positioning accuracy of the cathode. The assembly method is related.

[0002]

2. Description of the Related Art As shown in FIG. 2, a cathode ray tube electron gun includes a cathode 1 for emitting electrons and a G1 electrode 2A, a G2 electrode 3, a G3 electrode 4, a G4 electrode 5, a G5 electrode 6, for controlling an electron beam. The G6 electrode 7 is composed of tubular electrodes, etc., and these electrodes are stacked with high precision at an arbitrary interval by an assembly jig (not shown). , 3, 4, 5,
It is formed by burying 6 and 7. In such an electron gun, in particular, the distance L between the cathode 1 and the G1 electrode 2A has a great influence on the performance of the electron gun, and therefore the distance L needs to be accurately set to a predetermined dimension. Therefore, when assembling the electron gun, the G1 electrode 2A, the G3 electrode 3, the G4 electrode 4, the G5 electrode 5, and the G6 electrode 7 are assembled using a jig.
Precisely positioning and embedding in the glass column 8 and assembling in advance, and as shown in FIG. 3, the hermetic seal support 10A is welded to the G1 electrode 2A at the welding point 9, and thereafter,
Insert the cathode 1 into the cathode support 1a,
The distance L between the G1 electrode and the G1 electrode 2A is accurately measured individually by an air micrometer (not shown) or an optical method, and after positioning, the cathode 1 and the cathode support 1a are welded at a welding point 9a and assembled. Was.

However, even with the method described above, the cathode 1
The method of manually measuring the distance L between the G1 electrode 2A and the G1 electrode 2A requires an operator's skill and is not suitable for mass production because of poor work efficiency. Further, in the method of measuring the distance L between the cathode 1 and the G1 electrode 2A by an optical method, the measured value is easily affected by the external light, the shape of the measurement target (cathode 1, G1 electrode 2A), the color tone, and the like. Therefore, as disclosed in Japanese Patent Application Laid-Open No. 3-179632, the G1 electrode 2A and the cathode 1 are each held by a mechanism capable of fine feed, and the distance L is measured with an air micrometer. There is used an electron gun assembly apparatus which is automated by moving the mechanism capable of fine feed by a feedback control means so that the value becomes a predetermined value.

[0004]

However, even if the electron gun assembling apparatus having the above-mentioned structure is used, there is a problem in that the welding portion is distorted due to pressure and heating during welding, and the interval L cannot be accurately maintained. Furthermore, since centering is performed by fitting the cathode and the G1 electrode, it is necessary to accurately center the space between the cathode and the cathode support or between the G1 electrode and the cathode support. There is a problem that the configuration of these parts becomes complicated, the dimensional accuracy is lowered, and the cost is increased. In order to solve the above problems, an object of the present invention is to embed a hermetic seal support that supports a cathode through an insulator directly into a glass column through an auxiliary support fitting that is fixed to the hermetic seal support. An object is to provide an electron gun for a cathode ray tube in which a welding process is omitted.

[0005]

SUMMARY OF THE INVENTION According to the present invention, in an electron gun assembly constructed by embedding a plurality of electrodes in a glass column, a hermetic seal support for supporting a cathode is an auxiliary support fixed to the hermetic seal support. Provided is an electron gun assembly which is directly embedded in the glass column via a metal fitting. Also provided is a method of assembling an electron gun assembly including a step of positioning a plurality of electrodes including a support member that supports a cathode at predetermined positions by a positioning jig and then burying each electrode in a glass column.

[0006]

According to the above construction, since the hermetic seal support for supporting the cathode is accurately positioned by the assembly jig and directly embedded in the glass column by the auxiliary support fitting,
It is not necessary to weld the cathode and the cathode support or the hermetic seal support that supports the cathode and the G1 electrode. Therefore, the welded portion does not distort due to pressure or heating during welding, and the distance L can be accurately maintained. Further, since the center of the cathode and the G1 electrode can be freely adjusted, the structure of the assembly parts is simplified, and the dimensional accuracy is not lowered and the cost is not increased.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. As shown in FIG. 1, an electron gun assembly according to an embodiment of the present invention includes a hermetic seal support 10 that supports a cathode 1 that emits electrons and a G that controls an electron beam.
1 electrode 2, G2 electrode 3, G3 electrode 4, G4 electrode 5, G5
Cylindrical electrodes such as the electrode 6 and the G6 electrode 7 are stacked and positioned with high precision at an arbitrary interval by an assembly jig (not shown), and auxiliary support of the hermetic seal support 10 is provided on the melted glass column 8. The metal fitting 11 and the respective electrodes are simultaneously embedded and formed. According to this embodiment,
The distance L and the centering between the cathode 1 and the G1 electrode 2 are accurately set to predetermined dimensions only with an assembly jig. According to the above-described embodiment, the cathode and the support for the cathode can be welded in advance before assembling, and the welding work between the hermetic seal supporting the cathode and the G1 electrode is not necessary, and the welding process can be omitted. Accurate dimensional relationships can be maintained without distortion of the weld due to pressure or heating during welding.

Although the example of the electron gun assembly formed of the cathode and the G1 to G6 electrodes has been described above, the present invention is not limited to this example, and the electron gun assembly including the cathode and the G1 to G5 electrodes, for example. Needless to say, the same effect can be obtained by applying the present invention to an electron gun assembly including a plurality of electrodes.

[0009]

According to the present invention, since the hermetic seal support for supporting the cathode is accurately positioned by the assembly jig and the auxiliary support fitting is directly embedded in the glass column, the welding between the cathode and the cathode support is prevented. It is possible to pre-assemble before assembling, and welding of the G1 electrode and the hermetic seal for supporting the cathode is unnecessary. Therefore, the welded portion does not distort due to pressure or heating during welding, and the distance L can be accurately maintained. Further, since the center of the cathode and the G1 electrode can be freely adjusted, the structure of the assembly parts is simplified, and the dimensional accuracy is not lowered and the cost is not increased.

[Brief description of drawings]

FIG. 1 is a sectional view of an electron gun assembly according to an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional electron gun assembly.

FIG. 3 is an enlarged cross-sectional view of a main part of a conventional assembly portion of a cathode and a G1 electrode.

[Explanation of symbols]

 1 Cathode 1a Cathode support 2 G1 electrode 3 G2 electrode 4 G3 electrode 5 G4 electrode 6 G5 electrode 7 G6 electrode 8 Glass column 9, 9a Welding point 10 Hermetic seal support 11 Auxiliary support metal fitting

Claims (2)

[Claims] 1. An electron gun assembly comprising a plurality of electrodes embedded in a glass support column, wherein a hermetic seal support for supporting a cathode is attached to the glass support via an auxiliary support fitting fixed to the hermetic seal support. An electron gun structure characterized by being buried directly. 2. A method of assembling an electron gun assembly, comprising the steps of positioning a plurality of electrodes including a hermetic seal support for supporting a cathode at predetermined positions by a positioning jig and then burying each electrode in a glass column. .