JPS61131346A - Manufacture of electron tube getter - Google Patents

Abstract

PURPOSE:To obtain getter excellent in directivity and able to reduce a spark current by forming a ring bottomed groove on the surface of a plate material while filling getter material into said bottomed groove followed by molding the flange part so as to raise it above the outer side wall. CONSTITUTION:A ring bottomed groove 27 is formed on the surface of a plate material while a flange 28 is continuously provided toward outside in the horizontal direction above the outer side wall 27a of the bottomed groove 27. Next, barium 23, which is getter material, is filled inside the bottomed groove 27 while the outer face of the outer side wall 27a of the bottomed groove 27 is fitted into a molding die 30. In said state, an annularly formed punch 31 for pressing and molding is made to descend from above while pressing barium 23 inside the bottomed groove 27 for being fixed while pressing down the bottomed groove 27 into a molding die for molding the flange part 28 so as to raise it above the outer side wall 27a of the bottomed groove 27 in a straight line along said outer side wall 27a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method for manufacturing an electron tube getter provided in a cathode ray tube.

[Technical background of the invention and its problems]

In general, getters for electron tubes have conventionally been made as shown in FIG. That is, after inserting the ring-shaped groove-shaped container 11 into the crimp-type lower die 12 and positioning it on the knockout 13, the getter material 1 is inserted by a souffle lever (not shown).
4 was filled into a container 11 and pressed with an upper punch 15.

Here, the directivity of the getter used in the cathode ray tube has an important weight, and there is a strong desire to reduce the spark current through the barium film. Spark current can be solved by eliminating contact between the getter support, which extends from the electron gun, and the getter barium film deposited on the inner surface of the cathode ray tube. For this purpose, the directivity of the getter,
That is, it is necessary to prevent Varyneem from adhering to the back side of the getter. In order to satisfy such demands, it is necessary to form the container into a deep groove shape and fill the inside of the container with a small amount of getter material.

However, in the manufacturing method shown in FIG. 4 described above, when the container 11 has a deep groove shape, it is difficult to uniformly fill the inside of the container with the powder getter material, making it difficult to commercialize the container.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing an electron tube getter, which makes it possible to manufacture a getter that has good directivity and can reduce spark current through a barium film.

[Summary of the invention]

The method for manufacturing an electron tube getter according to the present invention includes forming an annular bottomed groove on the surface of a plate material, filling the bottomed groove with a getter material, pressing the getter material, and pressing the getter material outside the bottomed groove. By molding the flange part, which is horizontally connected to the outside of the upper part of the wall, so as to raise it above the outer wall, it is possible to uniformly fill a small amount of getter material, and it has excellent directivity. This makes it possible to manufacture a getter with reduced spark current.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

First, FIG. 2 shows a getter 2 made by the method of the present invention.
1, and an example of its use is shown in FIG. When in use, the getter 21 is installed in a cathode ray tube 22 as shown in FIG. 3, but a getter with excellent directivity is required in order to reduce the spark current at °C through the barium film. For this purpose, as shown in FIG. 2, the inside 25 of the getter container 24 is shielded to prevent the getter material barium 23 from scattering to the back side of the getter, and the outside is formed to be higher than the inside. By forming the barium film in this way, the directivity can be improved as described above, and the spark current through the barium film can be reduced.

Next, a method for manufacturing the getter 21 as described above will be explained with reference to FIG. First, as shown in i), an annular bottomed groove 21 is formed on the surface of a metal plate. Therefore, the portion 25 inside the bottomed groove 27 is shielded by the horizontal bottom plate portion. Furthermore, a flange 28 is provided horizontally and horizontally at the upper part of the outer side 927a of the bottomed groove 21. Next, as shown in (2), barium 23 as a getter material is filled into the bottomed groove 21 using a powder filling machine (not shown) and pressed. This press strength is the optimum pressure bonding strength for the next step, the final pressure forming step. Next, (as shown by Q), the plate material having the right bottom groove 27 formed therein is mounted in the molding die 30 in such a manner that the outer surface of the outer wall 27a of the bottomed groove 21 is fitted.

In this state, the annularly formed punch 31 for crimping and forming is lowered from the top to press and press the barium 23 in the bottomed groove 21, and the bottomed groove 21 is moved into the forming die 3.
0, and the flange 28 is formed above the outer wall 27a of the bottomed groove 27 so as to form a straight line with the outer wall 27a. Note that an oil-less lubricant is used for this molding process.

By the above manufacturing method, the inner side 25 of the getter container 24 shown in FIG. 21 can be obtained.

(Effects of the Invention) According to the present invention, in the production of deep groove type getters, it is possible to uniformly fill a small amount of getter material, and it is also possible to give a fingertip quality to the barium distribution in the cathode ray tube.

[Brief explanation of the drawing]

Figure 1) @ (Q is a sectional view showing each step in an embodiment of the method for manufacturing an electron tube getter according to the present invention, Figure 2 is a sectional view showing the getter manufactured by the manufacturing method in Figure 1, Third
The figure is an explanatory diagram showing an example of the use of the getter shown in Figure 2,
The figure is a sectional view showing a conventional manufacturing method. 21... Getter, 23... Getter material, 21... Bottomed groove,
27a...Outside wall, 28...Flange.

Claims (1)

[Claims] (1) After forming an annular bottomed groove on the surface of the plate material and filling the bottomed groove with a getter material, press the getter material and horizontally extend the upper part of the outer wall of the bottomed groove outward. A method of manufacturing an electron tube getter, characterized in that a flange portion connected to the outer wall is formed so as to be raised above the outer wall.