JP2724147B2 - Electron gun assembly equipment - Google Patents

Description

The present invention relates to an electron gun assembling apparatus used for assembling an electron gun for a cathode ray tube, and more particularly to a multistage focusing type having a plurality of electrodes. The present invention relates to an electron gun assembling apparatus suitable for use in assembling an electron gun.

(Prior Art) Generally, a bipotential electron gun used for a color cathode ray tube is configured as shown in FIG. 3, and a first grid 61, a second grid 62, The third grid 63 and the fourth grid 64 are arranged at predetermined positions and intervals, and are indicated by the glass columns 67.
Further, as shown in FIG.
And the first grid 71, the second grid 72, the third grid 73,
Fourth grid 74, Fifth grid 75, Sixth grid 76
There is also a multistage focused electron gun which is composed of a plurality of grid electrodes and supported on a glass column 70.

When assembling the electron gun as described above, an assembling apparatus is used. The conventional assembling apparatus is configured as shown in FIG. 5, and includes a base 51 and a positioning of each grid electrode implanted on the base 51. , And a guide shaft 52 fixed to the base 51, and a pressing portion 53 is fitted to the guide shaft 52.

At the time of assembling, generally flat plate-shaped spacers 54a to 54d that determine the distance between the grid electrodes are interposed, and the molten glass column 67 or 70 is protruded from the side of the electrode so that a predetermined positional relationship is obtained. Embedded in each part to integrate the respective grid electrodes.

The electrode opening from the last grid electrode side of the third grid forming the main electron lens to the last grid electrode is large, and the triode portion and the first grid 61 forming the prefocus lens from the first grid 61 to the cathode side of the third grid 63 are large. The electrode openings are small.

Therefore, in the core rod 55 of this electron gun assembling apparatus, a grid electrode group having a large opening diameter is arranged on the base mounting side, and a grid electrode group on the cathode side having a small opening diameter is arranged on the open end side of the core rod 55. The outer diameter is set so that it becomes smaller from the mounting side to the open end side so that the grid electrodes can be removed from the base 51 and the core rod 55 after the grid electrodes are integrated. ing.

(Problems to be Solved by the Invention) The above restriction is not so serious in the case of a bipotential electron gun, but in the case of a multistage focusing electron gun, three or more electrodes constituting the main electron lens system are used. In spite of the fact that the degree of freedom in designing the setting of the aperture diameter of the grid electrode is large, it cannot be used 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. Also, the opening diameter of the third grid 73 cannot be made larger than the opening diameter of the fourth grid 74.

As a measure for avoiding the above restriction, a guide hole 81 system as shown in FIG. 6 has been conventionally implemented. This is a method of assembling with reference to a guide hole 81 provided near the opening 80 of the grid electrode. In addition, there is also a method of assembling together with the core rod 55, but in recent years, as the diameter of the main electron lens system has increased, and because of the restriction on the inner diameter of the neck portion into which the electron gun is inserted, a guide hole is formed in the grid electrode. At present, there is no room for installation.

Further, as another method, FIGS. 7 (a), (b),
As shown in (c), there is a method of performing the above operation on a spacer for determining the interval between the grid electrodes, and a circular opening to be fitted to the core rod 55 is available.
An annular protrusion 92 is provided on a plate-like spacer 93 having a diameter 91 so as to fit into the inner diameter of the grid electrode opening, and holds a grid electrode having a diameter larger than that of the core rod 55. In this case, after the grid electrode is fixed to the glass pillar, it is necessary to remove the base 51 and the core rod 55 from the fixed grid electrode group, and then remove the spacer 93 from the grid electrode interval. Therefore, the height h of the annular projection 92 provided on the spacer 93 needs to be T> t + h when the spacing between the spacer layer t and the grid electrode T is satisfied.
Dimensions cannot be secured.

Another method is disclosed in Japanese Patent Application Laid-Open No. 62-126518, in which a step is provided in a portion of the core rod located at a large diameter of the grid electrode opening, and a gap between the grid electrode opening diameter and the core rod diameter is provided. A method has been proposed in which a grid electrode having a large opening diameter is held by a corresponding divided cylinder. However, this method is time-consuming to assemble and remove, and is difficult to handle because the divided cylindrical parts are small.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electron gun assembling apparatus capable of freely setting a diameter of a grid electrode forming an electron gun.

[Constitution of the Invention] (Means for Solving the Problems) The present invention relates to a core rod which is implanted in a base, has a partially different outer diameter, and is fitted with each electrode of an electron gun when used. In an electron gun assembling apparatus comprising a spacer fitted to a core rod and interposed between the electrodes, the spacer is fitted to a circular opening fitted to an outer periphery of the core rod and to an outer periphery of the electrodes. An electron gun assembling apparatus having a pair of rectangular projections to be combined.

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

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

The electron gun assembling apparatus of the present invention is an improvement of the spacer in order to solve the above-mentioned problems of the conventional example, and only the spacer will be described.

That is, the spacer 1 used in the present invention is shown in FIG.
It is configured as shown in (b) and (c), is formed in a plate shape, and has a rectangular shape having a long side portion and a short side portion. Then, 3 is fitted to the outer periphery of the core rod 55 (see FIG. 5).
The circular openings 5 and the lattice electrodes (FIGS. 3 and 4
A pair of rectangular projections 2 to which the outer periphery of each grid (shown in the figure) is fitted are provided. In this case, the rectangular projection 2 is provided so as to protrude from a long side portion in contact with the short side portion.

The electron gun assembling apparatus of the present invention has the same configuration as that of the conventional example (FIG. 5) except for the spacer 1, and a detailed description thereof will be omitted.

Next, using the electron gun assembling apparatus of the present invention, the fourth
A multi-stage focused electron gun (see FIG. 3) in which the opening diameter of the grid is the largest and the opening diameter is smaller in the order of the sixth grid, the fifth grid, the third grid, the second grid, and the first grid. The case of assembling 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 aperture diameter of the fourth grid is the sixth grid, the fifth grid,
Since it is larger than the opening diameter of the third grid, the core rod 55 shown in FIG.
When the fourth grid 74 is inserted in the first place, it is difficult to set an accurate position with a normal plate-like spacer.

Therefore, as shown in FIGS. 2 (a) and 2 (b), in the present invention, the above-described spacers 1 and 1 are used, and the fourth grid 74 is inserted into the core rod 55 so as to sandwich it from above and below. At this time, the position of the fourth grid 74 is set so that the reference surfaces 3, 4 of the spacer 1 in FIG. 1 and the reference surfaces 12, 13 of the fourth grid 74 in FIG.

In addition, the reference surfaces 3, 4 and the circular opening 5 of the spacer 1 shown in FIG.

Therefore, by using the spacer 1 of the present invention, a grid electrode having a large diameter can be easily assembled.
Also, when removing the spacers 1 and 1, FIG.
As shown in (b), the projections 2 of the spacers 1 and 1 are assembled so as to cross each other, so that they can be easily removed in one direction.
As a result, a grid electrode having a large diameter can be easily assembled without deteriorating workability and without deteriorating assembly accuracy.

The spacer 1 used in the present invention can also be used for a fourth grid 32 having an oblong opening 31 as shown in FIG. 9, and used together with a core rod 55 as shown in FIG. Is also possible.

Although the present invention has been described with reference to a plate-like grid electrode, it goes without saying that the present invention can also be used for a cup-shaped grid electrode or the like.

[Effects of the Invention] As described above, according to the present invention, the opening diameter of the grid electrode forming the electron gun is freely set, and the restrictions on the manufacture and assembly of the electron gun having the complicated grid electrode configuration are eliminated. I can do it.

[Brief description of the drawings]

1 (a), 1 (b) and 1 (c) are plan views showing spacers used in an electron gun assembling apparatus according to one embodiment of the present invention.
2 (a) and 2 (b) are a plan view and a side view showing the use state of the spacer of FIG. 1, and FIG. 3 is a front view including a partial cross section showing a bipotential electron gun. Figure, 4th
FIG. 5 is a front view including a partial cross section showing a multistage focusing electron gun, FIG. 5 is a front view including a partial cross section showing a conventional electron gun assembling apparatus, and FIG. FIGS. 7 (a), (b), and (c) are plan views, side views, and side views showing spacers used in a conventional electron gun assembling apparatus.
8 (a) and 8 (b) are a plan view and a side view showing a fourth grid of the multistage focusing electron gun, and FIG. 9 is a plan view showing another example of the fourth grid. 1 ... spacer, 2 ... rectangular projection, 5 ... circular opening, 51 ... base, 55 ... core rod.

Claims (1)

(57) [Claims] 1. A core rod which is implanted on a base and has a partially different outer diameter and to which electrodes of an electron gun are fitted during use, and which is fitted to the core rod and interposed between the electrodes. An electron gun assembling apparatus comprising: a spacer having a plate shape; a circular opening fitted to the outer periphery of the core rod; and a pair of rectangular projections fitted to the outer periphery of each electrode. An electron gun assembling apparatus comprising: