JPH0518833Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to the electrode support structure of an electron tube.
In particular, the present invention relates to a structure in which an in-tube electrode is supported and fixed to the plurality of electrode support rods.

(Prior Art) As shown in FIGS. 6 and 7, a conventional electron tube such as a transmitting tube has a plurality of tubes fixed to an external electrode terminal 12 of a ceramic insulating stem 11 and protruding into the tube. Electrode support rods 13, 14
A cylindrical electrode support 14 is welded at the point indicated by arrow P, and a cylindrical tube electrode 15, such as a grid, is fixed to the open end flange portion 14a of this support 14.

(Problems to be Solved by the Invention) In such an electrode support structure, the radial position and inclination of the grid electrode 15 are strongly controlled by the fixing accuracy of the cylindrical support 14 to the electrode support rod 13. However, because of the structure described above, the cylindrical support 14 tends to tilt with respect to the support rod 13. Further, each support component is made of a high melting point metal such as molybdenum to withstand high temperature operation.
Therefore, it is necessary to sandwich and weld an intermediate metal thin plate such as nickel between the support rod and the cylindrical support, and the positional relationship between the two tends to be disrupted during welding.

This invention eliminates the above-mentioned disadvantages, suppresses the occurrence of coaxial positional relationship and inclination of the cylindrical support with respect to the electrode support rod, and provides an electrode support structure for an electron tube that is easy to assemble and provides high precision. The purpose is to

[Structure of the device] (Means for solving the problem) In this device, slits extending in the circumferential direction and the axial direction are formed at the tips of a plurality of electrode support rods, and the electrodes in the tube are supported in these slits. This is an electrode support structure for an electron tube in which a skirt portion of a cylindrical support is fitted and this fitting portion is welded and fixed.

(Function) According to this invention, the skirt portion of the cylindrical support supporting the tube electrode is fitted into the slit extending in the circumferential direction and axial direction formed at the tip of each support rod and fixed by welding. Therefore, there is almost no risk that the electrode support will be displaced or tilted in the radial direction during assembly. Therefore, a highly accurate electrode support structure can be obtained. Also,
Even if the length in the axial direction of this electrode support portion is relatively short, there is little risk of misalignment, and a highly accurate support structure can be obtained.

(Example) As shown in Fig. 1, a ceramic insulating stem 1
A plurality of electrode support rods 13, 1 fixed to 1
Slits 16, 16 extending in the circumferential direction and the axial direction are formed at the distal end of 3, respectively. A cylindrical support 14 to which the lower end of a grid-like tube electrode 15 is fixed to each of these slits 16.
The lower casut portions of the two are fitted together and fixed by arc welding at the position of the arrow P with the nickel foil 17 in between. Also, the flange portion 14 of this support 14
The lower flange portion 15a of the tube electrode 15 is arc welded to a. Note that each of these parts is made of a high melting point metal such as molybdenum.

In this electrode support structure, as shown in FIG. 2, slits slightly wider than the thickness of the cylindrical support are formed at the tips of the two support rods 13 in the circumferential and axial directions. formed along.
The distance between the slits 16 corresponds approximately to the diameter of the support 14, and the lower end positions of the slits are both formed to the same position along the axial direction.

Next, as shown in FIG. 3, the lower end skirt portion of the cylindrical support 14 is fitted into the slit 16 of each support rod 13. Then, as mentioned above, it is fixed by welding.

In the embodiment shown in FIGS. 4 and 5, a notch 18 having a width W corresponding to the diameter D of the support rod 13 is formed in the skirt portion of the cylindrical support 14 at a position corresponding to the support rod. It is something. This notch 18 is connected to the support rod 13.
It is inserted from the slit part further down to the bottom of the figure.
The contact of the end face of the notch with each slit 16 and the contact of the side surface of the notch with the outer peripheral surface of the support rod reliably suppresses inclination of the cylindrical support in all directions. This prevents deviations in the coaxial positional relationship and inclination between the support rod and the cylindrical support, resulting in a highly accurate support structure. Furthermore, sufficient mechanical support strength can be obtained.

Although the above embodiments have been described with reference to the case where there are two electrode support rods, the number of electrode support rods is not limited to this, and a plurality of electrode support rods may be used, such as three or four. What is necessary is to form a slit extending in the circumferential direction and the axial direction corresponding to the portion.

[Effect of the invention] As explained above, according to this invention, the skirt portion of the cylindrical support supporting the in-tube electrode fits into the slit extending in the circumferential direction and the axial direction formed at the tip of each support rod. Since the support rod and the cylindrical support are fixed together, there is almost no possibility that the support rod and the cylindrical support will be displaced in the radial direction or tilted during assembly. Further, even if the length of the electrode support portion in the axial direction is relatively short, there is little risk of misalignment, and a highly accurate support structure can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a main part showing an embodiment of this invention, Fig. 2 is an exploded perspective view showing the state before assembly, Fig. 3 is a perspective view showing the assembled state after that, Figs. FIG. 5 is a perspective view of a main part showing another embodiment of this invention, FIG. 6 is a vertical sectional view of a main part showing a conventional structure, and FIG. 7 is an enlarged view of the main part. 11... Stem, 13... Electrode support rod, 1
4... Cylindrical support, 15... In-tube electrode, 16...
...Slit, 18...notch.

Claims (1)

[Claims for Utility Model Registration] (1) In an electrode support structure for an electron tube in which an electrode within the tube is fixed to a plurality of electrode support rods via a cylindrical support, each of the electrode support rods has a circular shape at the tip thereof. An electrode support structure for an electron tube, characterized in that a slit extending in the circumferential direction and the axial direction is formed, a part of the cylindrical support is fitted into the slit, and this fitting part is fixed by welding. (2) The electrode support structure for an electron tube according to claim 1, wherein the cylindrical support has a notch formed at a position corresponding to the support rod.