JPS6358740A - Electron gun structure - Google Patents

Abstract

PURPOSE:To decrease the number of parts and assembling man-hours and to prevent cylindrical electrodes from being contaminated without deteriorating assembly environments, by bending end parts of respective bumps passing through holes so that relative positions of plural cylindrical electrodes are fixed. CONSTITUTION:Plural bumps 13a or the like are formed respectively on cylindrical electrodes 11-13. Plural insulated rods 21 having plural holes 21a bored corresponding to these plural bumps 13a or the like are made to engage with the cylindrical electrodes 11-13. End parts of the plural bumps 13a passing through the plural holes 21a are bent so that relative positions of the cylindrical electrodes 11-13 are coaxially fixed. Thus, the number of parts can be decreased and a soldering process is not required at all in assembling processes, so that deterioration of assembly environments and contamination of electrode parts can be prevented without gas flames being used.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is suitable for cathode ray tubes such as compact image pickup tubes.
Relating to an electron gun structure in which the relative positions of the cylindrical electrodes can be coaxially fixed without performing welding work or using gas flame when assembling a plurality of cylindrical electrodes constituting a lens part, and in which the number of parts is reduced. .

[Conventional technology]

In general, in a cathode ray tube, the diameter of the pulp is made as small as possible, and an electron gun with a large diameter (that is, an electron lens diameter) is housed inside the pulp to form a well-focused electron beam at all times. In order to obtain excellent performance, various efforts have been made and many proposals have been made regarding methods and means for fixing the relative positions of the electrodes constituting the electron gun coaxially.

For example, as a structure in which an electron lens with a large diameter (therefore, a cylindrical electrode with a large diameter) is accommodated in a bulb with a small inner diameter and fixed coaxially,
In order to coaxially fix the third cylindrical electrode 1, fourth cylindrical electrode 2, and fifth cylindrical electrode 3 as shown in FIG. The steatite rods 4 are arranged at equal intervals, and the steatite rods 4 are held down by molded metal pieces 5 so that they come into close contact with the cylindrical electrodes 1 to 3, and the metal pieces 5 are attached to the cylindrical electrodes 1 to 3. A method of fixing by resistance welding is disclosed. In addition, in the figure, 6 is the first grid, 7 is the second grid, 8 is the third grid,
9 indicates a glass rod. However, this structure is cylindrical', t
There were approximately 48 welding points between the i-branches 1 to 3 and the metal piece 5, which resulted in a large number of parts and a large number of assembly steps.

As another structure, for example, in Japanese Patent Application Laid-Open No. 54-52980, a plurality of metal pieces (not shown) are attached to the cylindrical electrodes 1 to 3 by welding in advance, and a plurality of glass rods 10 are attached to the cylindrical electrodes 1 to 3 using gas. A method has been disclosed in which the metal piece is heated and softened with a flame, and then the glass rod is cooled and solidified to be fixed. However, this structure does not require the use of a gas flame to heat the glass rod. Since the use of cylindrical electrodes deteriorates the working environment and further contaminates the cylindrical electrodes 1 to 3, cleaning of the electrodes is required after assembly.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the conventional techniques described above, and to provide an electron gun assembly that requires fewer parts and fewer assembly steps, does not deteriorate the assembly environment, and can prevent contamination of the cylindrical electrode.

[Means for solving problems]

In order to solve the above problems, in the present invention, a plurality of cylindrical electrodes constituting an electron gun are each provided with a plurality of protrusions, and each of these protrusions is provided with a hole corresponding to each protrusion. Insert and engage the holes of multiple insulating rods provided.
The relative positions of the plurality of cylindrical electrodes were fixed by bending the ends of each protrusion passing through the hole.

[Effect]

If the above-mentioned method is adopted, and the protrusions are simultaneously made from the same material by press molding or the like when making the cylindrical electrode, the number of parts and welding locations can be significantly reduced.

Even if the protrusions are fixed by welding, this is done at the stage of manufacturing the electrode parts, so the process can be easily automated, and splashes during welding can be removed in the cleaning process of the parts.

Furthermore, since there is no need to use gas flames, there is no need to worry about deteriorating the assembly work environment or contaminating parts.

〔Example〕

The first and second actual travel examples of the present invention will be explained below with reference to Figures 1.2.3.4.

In the first embodiment, as shown in FIG.
3 are provided with a plurality of protrusions 13a, etc., respectively. A plurality of insulating rods 21 having a plurality of holes 21a corresponding to the plurality of protrusions 13a etc. are attached to the cylindrical electrodes 11 to 13, and the ends of the plurality of protrusions 13a passing through the plurality of holes 21a are bent. The relative positions of the cylindrical electrodes 11 to 13 are fixed coaxially. A cross-sectional view of this state (cross section AA'' shown in FIG. 1) is shown in FIG.

In the second embodiment, as shown in FIG. 3, a plurality of L-shaped metal pieces 16a are welded to the cylindrical electrodes 14 to 16 to form protrusions. A plurality of holes 22a corresponding to these metal pieces 16a
A plurality of insulating rods 22 with openings are attached to the cylindrical electrodes 14 to 16, and the ends of the metal pieces 16a passing through the plurality of holes 22a are bent to fix the relative positions of the cylindrical electrodes 14 to 16 coaxially. A cross-sectional view of this state (BB' shown in Figure 3)
A T-shaped metal piece (not shown) may be used instead of this L-shaped metal piece 16a, whose cross section is shown in FIG.

〔Effect of the invention〕

As explained above, according to the present invention, the number of parts can be reduced compared to the conventional method, no welding is required in the assembly process, and no gas flame is used, so deterioration of the assembly environment and contamination of electrode parts can be prevented.

[Brief explanation of the drawing]

1.2 is an explanatory diagram of the first embodiment of the present invention, FIGS. 3 and 4 are explanatory diagrams of the second embodiment, and FIG. 5.6 is an explanatory diagram of a conventional electron gun assembly. 11.12.13.14.15.1B-・Cylindrical electrode,
13a - protrusion, 16a - L-shaped metal piece, 21.
22-insulating rod, 21a-m-hole corresponding to protrusion 13a;
22a - A hole corresponding to the L-shaped metal piece 16a.

Claims (1)

[Claims] 1. Providing multiple protrusions on each of the multiple cylindrical electrodes that make up the electron gun, and inserting these protrusions into the holes of multiple insulating rods that have holes corresponding to each protrusion. An electron gun assembly characterized in that the relative positions of the plurality of cylindrical electrodes are fixed by engaging and bending the ends of the respective protrusions passing through the holes.