JPS6231777B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in electrode supporting insulators used in magnetrons and the like.

In magnetrons, a ceramic structure with a cross-sectional shape as shown in FIG. 1 was used as an electrode supporting insulator.

That is, the conventional electrode support insulator shown in FIG. 1 is made of a monolithically constructed ceramic sintered body, and has a bamboo node-shaped electrode support part 2 on the upper inner wall of a cylindrical body part 1.

The electrodes 3 are each inserted into a through hole 4 of the electrode support 2, and the insulator is fixed to a metal ring 5 (only a portion of which is shown) of the magnetron body.

The electrode 3 is generally made of molybdenum, and in order to adhere to the ceramic in an airtight manner, molybdenum paste is applied in advance to the periphery of the through hole 4 and heat treated, a nickel plating layer 6 is formed thereon, and the electrode 3 and the electrode 3 are brazed together 7. was doing. A similar method was used to secure the lower surface of the body 1 and the metal ring 5.

However, applying nickel plating to the electrode supporting insulator having the structure shown in Fig. 1 requires relatively complicated work, especially when plating the periphery of the through hole 4 into which the electrode 3 is inserted. This requires complicated jigs and the like, which hinders process simplification and cost reduction. Also, it was difficult to apply molybdenum paste to the peripheral edge of the through hole 4 because the body 1 was an obstacle.

The present invention has been made focusing on the above points,
An object of the present invention is to provide an electrode supporting insulator that facilitates plating work and allows adoption of the barrel plating method, which is suitable for mass production.

The present invention will be explained in detail below using figures.

FIG. 2 is a sectional view of an embodiment of the electrode supporting insulator of the present invention, and FIG. 3 is a top view thereof.

The electrode support insulator shown in the figure is composed of a monolithic ceramic structure similar to the conventional one. As shown in the figure, it has a cylindrical body part 11, a lid part 12 that covers the top of this body part, and an electrode support part 13 that projects upward in a columnar shape from the top surface of this lid part. The electrode support portion 13 is provided with an electrode insertion hole 14 approximately at its center. Metal plating layers 15 and 1, such as nickel plating layers, are provided on the lower surface of the body portion 11 and the upper surface of the electrode support portion 13, respectively.
6 and 17 are formed. In addition, in this embodiment, the metal plating layer 15 on the top surface of each electrode support part is
and the area of 16, and the metal plating layer 17 on the lower surface of the trunk.
The area is designed to be approximately equal to the area of

The electrode supporting insulator configured as described above has a metal plating layer 17 that can be brazed to the electrode 18 and fixed to the metal ring 19 in the same manner as in the past, thereby ensuring electrical insulation between the electrode 18 and the metal ring 19. A sufficient creepage distance is obtained by causing the electrode support portion 13 to protrude upward.

Moreover, unlike conventional products, all the parts to be plated are on the outside, so the barrel plating method can be used.

Furthermore, since the areas of the parts to be plated are approximately equal, the ratio of contact with the plating electrode within the barrel is approximately equal, making it possible to form a metal plating layer of the same thickness at all locations. Here, it goes without saying that molybdenum paste is applied and baked in advance on the parts that require plating, as in the past. In this case, with this electrode support insulator, the body 1 in FIG. 1 does not become an obstacle, making it easy to apply the molybdenum paste.

Note that the shape of the barrel may be adjusted so that each part that requires plating comes into uniform contact with the plating electrode during barrel plating.

As described above, the electrode support insulator of the present invention secures the necessary dielectric strength voltage by protruding the electrode support part, and since the part on which the plating layer is formed is on the outside, pretreatment and plating treatment are not required. It is easy to make, and barrel plating can also be used, which improves mass production.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional electrode support insulator;
The figure is a sectional view of one embodiment of the electrode support insulator of the present invention, and FIG. 3 is a top view thereof. DESCRIPTION OF SYMBOLS 1, 11... Body part, 12... Lid part, 2, 13... Electrode support part, 4, 14... Electrode insertion hole, 15, 16, 1
7...Metal plating layer.

Claims (1)

[Claims] 1 Consisting of a single-piece ceramic structure, it includes a cylindrical body, a lid that covers the top of the body, and an electrode that is arranged at a distance from each other on the top surface of the lid and protrudes in a columnar manner, with an electrode inserted in the center of each. 1. An electrode supporting insulator comprising a pair of electrode supporting parts having holes, the area of the metal plating part on the lower surface of the body being approximately equal to the area of the metal plating part on the upper surface of each electrode supporting part.