JPH01209627A - Electron gun assembly device - Google Patents

Abstract

PURPOSE:To make it possible to set freely the opening diameter of a grid electrode to form an electron gun by providing circular openings to gear with the outer periphery of a core rod, and a pair of rectangular projections to gear with the outer periphery of the electrode, to a spacer. CONSTITUTION:Spacers 1 are used to insert the fourth grid 74 in a core rod while holding the fourth grid 74 from the upper side and the lower side. In this case, the positioning of the fourth grid 74 is set to gear the standard surfaces 3 and 4 of the spacer 1 and the standard surface of the fourth grid 74, making to unify the standard surfaces 3 and 4 of the spacer 1, circular openings 5, and the diameter of the core rod. As a result, the electrode of a large diameter can be assembled easily by using the spacers 1, and when the spacers 1 are removed, they can be removed easily in one direction, because they have been assembled by staggering their projections 2 each other. By such a constitution, a large diameter of grid electrode can be assembled easily without deteriorating the working efficiency and without reducing the accuracy.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an electron gun assembly device used when assembling an electron gun for a cathode ray tube, and particularly relates to a multistage focusing type electron gun having a plurality of electrodes. The present invention relates to an electron gun assembly device suitable for use in assembling an electron gun.

(Prior Art) Generally, a pi-potential type electron gun used in a color cathode ray tube is constructed as shown in FIG. A third grid 63 and a fourth grid 64 are arranged at predetermined positions and intervals and are supported by glass columns 67. As shown in FIG. 4, the electron gun includes a cathode 78, a first grid 71, a second grid 72, a third grid 73, a fourth grid 74, and a fifth grid 75.
There is also a multi-stage focusing electron gun which is constructed of six grid electrodes of a sixth grid 76 and supported by a glass column 70.

When assembling the above-mentioned electron gun, an assembly device is used, and the conventional assembly device is configured as shown in FIG.
It consists of a base 51, a plurality of core rods 55 implanted in the base 51 for positioning each grid electrode, and a guide shaft 52 fixed to the base 51. are fitted.

During assembly, generally flat plate-shaped spacers 54a to 54d are interposed between the grid electrodes to determine the spacing therebetween, and molten glass columns 67 or 70 are inserted into the protrusions on the sides of the electrodes to obtain a predetermined positional relationship. to integrate each grid electrode.

The electrode aperture from the final grid electrode side of the third grid forming the main electron lens to the final grid electrode is large, and the electrode aperture from the first grid 61 to the cathode side of the third grid 63 forming the triode section and the prefocus lens is large. The electrode aperture is small.

Therefore, in the core frame 55 of this electron gun assembly device, a grid electrode part with a large opening diameter is arranged on the base mounting side, and a grid electrode part on the cathode side with a small opening diameter is arranged on the open end side of the core frame 55. The outer diameter is set so that it becomes smaller from the side toward the open end so that it can be fixed to the base 51 so that each grid electrode is arranged and removed from the base 51 and the core frame 55 after integrating each grid electrode. It is set.

(Issue 8 to be solved by the invention) In the case of a pi-potential type electron gun, the above constraints are
Although it is not so much of a problem, in the case of a multistage focusing electron gun,
Although there are three or more electrodes constituting the main electron lens system and there is a large degree of freedom in design regarding the setting of the grid electrode aperture diameter, it is not possible to make full use of it due to the above-mentioned restrictions. For example, the opening diameter of the fifth grid 75 cannot be made larger than the opening diameter of the sixth grid 76. Further, the opening diameter of the third grid 73 cannot be made larger than the opening diameter of the fourth grid 74.

As a measure to avoid the above-mentioned restrictions, a guide hole 81 method as shown in FIG. 6 has been conventionally implemented. This is a method for assembling based on a guide hole 81 provided near the opening 80 of the grid electrode. Also, core frame 5
There is also a method of assembling it in combination with 5, but in recent years, as the main electron lens system has become larger in diameter, and due to restrictions on the inner diameter of the neck where the electron gun is inserted, there is no longer any room to provide a guide hole in the grid electrode. The current situation is that

Furthermore, as other methods, FIGS. 7(a), (b), (C
), there is a method of using a spacer that determines the interval between each grid electrode, and a circular opening 9 that fits into the core frame 55 is used.
1 is provided with an annular protrusion 92 that fits into the inner diameter of the grid electrode opening to hold the grid electrode having a larger diameter than the core frame 55. In this case, after fixing the grid electrodes to the glass columns, it is necessary to remove the base 51 and the core frame 55 from the fixed grid electrode parts, and then extract the spacers 93 from the grid electrode intervals. Therefore, the height h of the annular protrusion 92 provided on the spacer 93 must be T>t+h, where T is the spacer layer and the grid electrode spacing, and as the grid electrode spacing becomes narrower, h
It becomes impossible to secure the dimensions.

Another method is disclosed in Japanese Unexamined Patent Publication No. 126518/1983, in which a step is provided in the part of the core frame where the grid electrode opening diameter is large, and the gap between the grid electrode opening diameter and the core frame diameter is adjusted. A method has been proposed in which a grid electrode with a large opening diameter is held by corresponding divided cylinders. However, this method takes time to assemble and disassemble, and the divided cylindrical parts are small, making them difficult to handle.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electron gun assembly device that can freely set the aperture diameter of a grid electrode forming an electron gun.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a core frame that is implanted in a base and has partially different outer diameters and into which each electrode of an electron gun is fitted during use; In an electron gun assembly device comprising a spacer fitted to a core frame and interposed between each of the electrodes, the spacer has a circular opening fitted to the outer periphery of the core frame and a spacer fitted to the outer periphery of each of the electrodes. This is an electron gun assembly device characterized by having a pair of rectangular protrusions that fit together.

(Operation) According to the present invention, it is possible to freely set the aperture diameter of the grid electrode forming the electron gun, thereby removing restrictions on manufacturing and assembling an electron gun with a complicated grid electrode configuration.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In order to solve the problems of the conventional example described above, the electron gun assembly apparatus of the present invention has an improved spacer, and only the spacer will be explained below.

That is, the spacer 1 used in this invention is shown in FIG.
It is constructed as shown in b) and (c), and is plate-shaped and formed into a rectangle consisting of a large diameter part and a small diameter part. 3 fitted on the outer periphery of the core frame 55 (see FIG. 5).
circular openings 5 and each of the grid electrodes (Figs. 3 and 4).
A pair of rectangular protrusions 2 are provided into which the outer periphery of each grid (in the figure) is fitted. In this case, the rectangular protrusion 2 is provided in a protruding manner on the large-diameter portion that is in contact with the small-diameter portion.

Since the electron gun assembly apparatus of the present invention has the same structure as the conventional example (FIG. 5) except for the spacer 1, detailed explanation will be omitted.

Next, using the electron gun assembly apparatus of the present invention, the opening diameter of the fourth grid is the largest, and the opening diameter of the sixth grid is the largest.
The case of assembling a multistage focusing electron gun (see FIG. 3) in which the grids are made smaller in the order of grid, fifth grid, third grid, second grid, and first grid will be described.

Generally, the fourth grid 74 has a plate shape or a shallow cup shape as shown in FIGS. 8(a) and 8(b). and,
The opening diameter of the fourth grid is the sixth grid, the fifth grid,
Because it is larger than the opening diameter of the third grid, the core frame 5 in Fig.
When the fourth grid 74 is inserted into the fourth grid 74, it is difficult to set the correct position using a normal plate-shaped spacer.

Therefore, as shown in FIGS. 8(a) and 8(b), in the present invention, the spacer 1.1 as described above is used and inserted into the core frame 55 so as to sandwich the fourth grid 74 from above and below. At this time, the position of the fourth grid 74 is set between the reference plane 3.4 of the spacer 1 in FIG. 1 and the fourth grid 74 in FIG.
The reference surfaces 12 and 13 of are set to fit together.

Also, the reference plane 3.4 of the spacer 1 in FIG. 1, the circular opening 5
The diameter of the core frame 55 is set to match the diameter of the core frame 55.

Therefore, by using the spacer 1 of the present invention, a grid electrode with a large diameter can be easily assembled. or,
When removing the spacers 1.1, the projections 2 of each spacer 1.1 are assembled so as to intersect as shown in FIGS. 2(a) and 2(b), so that the spacers 1.1 can be easily removed in one direction. As a result, grid electrodes with large diameters can be easily assembled without deteriorating workability or assembly accuracy.

Incidentally, the spacer 1 used in this invention can also be used for the fourth grid 32 having an oval opening 31 as shown in FIG. 9, and can be used in combination with a core frame 55 as shown in the same figure. is also possible.

Although this invention has been described with respect to a plate-shaped grid electrode, it goes without saying that it can also be used with a cup-shaped grid electrode, etc.

[Effects of the Invention] As explained above, according to the present invention, the aperture diameter of the grid electrode forming the electron gun can be freely set, thereby eliminating restrictions on manufacturing and assembling an electron gun with a complicated grid electrode configuration. I can do it.

[Brief explanation of the drawing]

FIGS. 1(a), (b), and (c) are plan views showing a spacer used in an electron gun assembly device according to an embodiment of the present invention;
2(a) and 2(b) are a plan view and a side view showing how the spacer in FIG. 1 is used, and FIG. 3 is a front view including a partial cross section showing the pi-potential electron gun. Figure, 4th
The figure is a front view including a partial cross section showing a multi-stage focusing electron gun, FIG. 5 is a front view including a partial cross section showing a conventional electron gun assembly device, and FIG. 7(a), (b), and (C) are plan views, side views, and side views showing spacers used in conventional electron gun assembly devices.
8(a) and 8(b) are a plan view and a side view showing the fourth grid of the multi-stage focusing electron gun, and FIG. 9 is a plan view showing another example of the fourth grid. DESCRIPTION OF SYMBOLS 1... Spacer, 2... Rectangular projection, 5... Circular opening, 51... Base, 55... Core frame. Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 (b)

Claims (1)

[Claims] A core rod that is implanted in the base and has partially different outer diameters and into which each electrode of the electron gun is fitted during use; In an electron gun assembly device comprising an intervening spacer, the spacer is shaped like a plate, and has a circular opening that fits around the outer periphery of the core rod, and a pair of rectangular protrusions that fit around the outer periphery of each of the electrodes. An electron gun assembly device comprising: