JPH03194831A - Magnetron - Google Patents

Abstract

PURPOSE:To decrease a quantity of projection from the anode body of an output conductor by forming a ring groove in the opening end edge of an insulating cylinder and forming an outside ring wall on the external circumferential side of this ring groove and an inside ring wall on the inside of the ring groove to connect a sealing metal or an output conductor to the bottom face of the ring groove. CONSTITUTION:A ring groove 22 is formed in the end edges of both openings on an insulating cylinder 21, an outside ring wall 23 is formed on the outside of a ring groove 22, an inside ring wall 24 is formed on the inside of the ring groove 22, and the inside ring wall 24 is made lower than the outside ring wall 23. Moreover, the surface of the ring groove (22) side between the outside ring wall 23 and the inside ring wall 24, or the internal circumferential face of the outside ring wall 23 and the external circumferential face of the inside ring wall 24 are slantingly formed such that the ring groove becomes gradually wider in the upper or lower direction. Active metal soldering material is arrangedly installed on the bottom face of the ring groove 22 to connect a sealing metal 9 and an output conductor 11 to the ring groove 22 by heating. In other words, even if the soldered portions of the sealing metal 9 and the output conductor 11 approach, the distance between the bottom faces of the ring groove 22 can be reduced. It is thereby possible to decrease the projection quantity from the anode body of the output conductor.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a magnetron used in microwave ovens and the like.

(b) Conventional technology Conventionally, as a general magnetron, for example,
The one shown in Publication No. 3 53411 (99B 21) is known.

This configuration will be explained below based on FIG. 3. 1 is a cylindrical anode body, 2 is a plurality of vanes formed from the inner surface of the anode body l toward the center, and 3 is the tip of the vane 2. A cathode is disposed in the enclosed space, 4 is an antenna conductor connected to one of the vanes 2, 5 and 6 are respectively disposed on the upper and lower surfaces of the vane 2, and every other vane 2 is connected to a cathode. 7.8 is a magnetic pole piece fixed to the upper and lower opening peripheries of the anode body 1, and 9.1o has one end attached to the upper and lower opening peripheries of the anode body 1. 11 is an output conductor whose one end is connected to the antenna conductor 4 and whose other end is fixed to the other end of the sealing metal 9 via a ceramic insulating cylinder 12; 13 is an output conductor which is fixed to the sealing metal 9; A cathode stem fixed to the other end of the sealing metal IO supports the cathode terminal 14 of the cathode body 3.

The above constitutes a vacuum tube.

15 is an annular magnet disposed above and below the anode cylinder 1;
6 is a plurality of heat sinks fixed to the outer peripheral surface of the anode cylinder l; 17;
18 is a shield case surrounding the cathode stem 13 protruding from the yoke 17; 19 is housed in the shield case 18, and one end is connected to the cathode terminal 14; The choke coil 2o connected to is a feed-through capacitor supported through the shield case 18 and connected to the other end of the choke coil 19.

In this configuration, the sealing metal 9 is attached to the opening at one end of the insulating cylinder 12.
is connected, and the output conductor 11 is connected to the opening at the other end of the insulating cylinder 12. However, the insulating cylinder 12 is sufficiently This has the drawback that the output conductor 11 protrudes from the anode body 1 by a large amount.

(c) Problems to be Solved by the Invention The present invention has been made in view of the above drawbacks, and is it possible to reduce the amount of protrusion of the output conductor from the anode body? The task is to provide Danetron.

(d) Means for solving the problem An annular groove is formed in at least one opening edge of the insulating cylinder, an outer annular wall is formed on the outer circumferential side of the annular groove, and an inner annular wall is formed inside the annular groove. , a sealing metal or an output conductor is connected to the bottom surface of the annular groove.

(e) Operation Since the outer annular wall and the inner annular wall cover the inner and outer surfaces of the sealing metal and the output conductor, even if the brazed portion of the sealing metal and the output conductor are close to each other, the outer annular wall and the inner annular wall A sufficient insulation distance between the sealing metal and the output conductor can be ensured. Therefore,
The distance between the connection between the insulating cylinder and the sealing metal and the connection between the insulating cylinder and the output conductor can be reduced, and the amount of protrusion of the output conductor from the anode body can be reduced.

(f) Example A first example of the present invention will be described in detail below with reference to FIGS. 1 and 2. Incidentally, parts that are the same as those in the prior art are given the same reference numerals and explanations will be omitted.

21 is an insulating cylindrical body with an annular groove 22 formed on both opening edges;
An outer annular wall 23 is provided on the outside of the annular groove 22.
An inner annular wall 24 is formed inside the outer annular wall 23, and the inner annular wall 24 is formed slightly lower than the outer annular wall 23. Further, the surfaces of the annular grooves 22 of the outer annular wall 23 and the inner annular wall 24, that is, the inner circumferential surface of the outer annular wall 23 and the outer circumferential surface of the inner annular wall 24, are such that the annular groove 22 gradually widens upward. It is formed to be slanted. Said annular groove 22
An active metal brazing material is placed on the bottom of the annular groove 22 and heated.
The sealing metal 9 and the output conductor 11 are connected to each other.

Thus, the sealing metal 9 and the output conductor 11 are connected to the bottom surface of the annular groove 22, and the outer annular wall 23 and the inner annular wall 24 cover the inner and outer surfaces of the sealing metal 9 and the output conductor 11, so that the sealing is completed. Even if the brazed portions of the metal 9 and the output conductor 11 are close to each other, a sufficient insulation distance between the sealing metal 9 and the output conductor 11 can be ensured by the outer annular wall 23 and the inner annular wall 24. Therefore, the annular groove 2
2, the distance between the bottom surfaces of output conductor 1 can be reduced.
The amount of protrusion of the anode body 1 from the anode body 1 can be reduced.

Further, the inner annular wall 24 is formed lower than the outer annular wall 23, but the inner annular wall 24 prevents electrical discharge between the sealing metal 9 and the output conductor 11 within the vacuum tube.
Since discharge is difficult to occur in a vacuum, the inner annular wall 24 should be at a height that covers the part where the sealing metal 9 and the insulating cylinder 21 are brazed, and the part where the output conductor 11 and the insulating cylinder 21 are brazed. If this is the case, the occurrence of electric discharge can be sufficiently prevented, and by forming the inner annular wall 24 lower than the outer annular wall 23, the amount of material etc. can be reduced.

Surfaces of the annular grooves 22 of the outer annular wall 23 and the inner annular wall 24,
That is, the inner circumferential surface of the outer annular wall 23 and the outer circumferential surface of the inner annular wall 24 are formed to be inclined so that the annular groove 22 gradually widens upward, so that the inner circumferential surface of the outer annular wall 23 and the outer circumferential surface of the inner annular wall 24 24 can be improved, and the sealing metal 9 and output conductor 11 can be easily attached.

In this embodiment, the annular groove 22 was formed at both opening edges of the insulating cylinder 21, but the annular groove 22 was formed only at one opening edge of the insulating cylinder 21, and the annular groove 22 was formed at both opening edges of the insulating cylinder 21. A sealing metal 9 or an output conductor 11 may be attached to the bottom surface of 22.

(G) Effects of the Invention As described above, according to the present invention, the outer annular wall and the inner annular wall can prevent discharge between the sealing metal and the output conductor, and the insulating cylinder and the sealing metal can be prevented from discharging. The distance between the connecting portion and the connecting portion between the insulating cylindrical body and the output conductor can be made short, and the amount of protrusion of the output conductor from the anode body can be made small.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of a main part of an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the same insulating cylinder, and FIG. 3 is a sectional view of a conventional structure. l...Anode body, 2...Vane, 4...Antenna conductor, 9...Sealing metal, 11...Output conductor, 2
1... Insulating cylindrical body, 22... Annular groove, 23...
Outer annular wall, 24...inner annular groove.

Claims (1)

[Claims] (1) A cylindrical anode body having a plurality of vanes, a cylindrical sealing metal connected to the opening of the anode body, and an insulating cylinder whose one opening edge is connected to the opening of the sealing metal. an output conductor having one end connected to the other open end of the insulating cylinder, an annular groove being formed in at least one open end of the insulating cylinder, and an output conductor having one end connected to the other open end of the insulating cylinder; A magnetron characterized in that an outer annular wall is formed inside an annular groove, and the sealing metal or the output conductor is connected to the bottom surface of the annular groove.