JP2840342B2 - Magnetron - Google Patents

Description

The present invention relates to a magnetron used for a microwave oven or the like.

(B) Conventional technology Conventionally, as a general magnetron, for example,
The thing shown in 53-53411 gazette (99B21) is known.

This configuration will be described below with reference to FIG. 3. 1 is a cylindrical anode body, 2 is a plurality of vanes formed from the inner surface of the anode body 1 toward the center, and 3 is a tip of the vane 2. The cathode 4 disposed in the enclosed space is an antenna conductor connected to one of the vanes 2, and the antenna conductors 5 and 6 are disposed on the upper surface and the lower surface of the vane 2, respectively. The inner strap ring and the outer strap ring which are connected to the magnetic pole pieces 7 and 8 are fixed to the upper and lower peripheral edges of the anode body 1, respectively. An output conductor 13 has one end connected to the antenna conductor 4 and the other end fixed to the other end of the sealing metal 9 via a ceramic insulating cylinder 12. The cathode stem fixed to the other end of the sealing metal 10 The pole terminals 14 are supported.

 The above constitutes a vacuum tube.

15 is an annular magnet disposed above and below the anode cylinder 1, 16
Is a plurality of heat sinks fixed to the outer peripheral surface of the anode cylinder 1, 17 is a yoke that surrounds the anode cylinder 1, the magnet 15, and the heat sink 16;
18 is a shield case surrounding the cathode stem 13 protruding from the yoke 17, 19 is housed in the shield case 18,
A choke coil, one end of which is connected to the cathode terminal 14, 20 is penetrated and supported by the shield case 18, a choke coil 19
This is a through-type capacitor connected to the other end.

In this configuration, the sealing metal 9 is placed at one end opening of the insulating cylinder 12.
And the output conductor 11 is connected to the other end opening of the insulating cylinder 12, but the insulating cylinder 12 is sufficient to prevent discharge between the sealing metal 9 and the output conductor 11. However, there is a drawback that the output conductor 11 needs to have a large height and the amount of protrusion of the output conductor 11 from the anode body 1 becomes large.

(C) Problems to be Solved by the Invention The present invention has been made in view of the above-mentioned drawbacks, and has as its object to provide a magnetron that can reduce the amount of protrusion of an output conductor from an anode body.

(D) Means for Solving the Problems An annular groove is formed on at least one opening edge of the insulating cylinder, and an outer annular wall is formed on the outer peripheral 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 of the annular groove.

(E) Action Since the outer annular wall and the inner annular wall cover the inner and outer surfaces of the sealing metal and the output conductor, the outer annular wall and the inner annular wall allow the outer annular wall and the inner annular wall even if the brazing portion of the sealing metal and the output conductor are close. A sufficient insulation distance between the sealing metal and the output conductor can be secured. 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) Embodiment A first embodiment of the present invention will be described in detail below with reference to FIGS. The same parts as those in the related art are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 21 denotes an insulating cylinder, which forms an annular groove 22 at both open end edges, forms an outer annular wall 23 outside the annular groove 22, and forms an inner annular wall 24 inside the annular groove 22. The annular wall 24 is formed slightly lower than the outer annular wall 23. Also, the surfaces of the outer annular wall 23 and the inner annular wall 24 on the annular groove 22 side, that is, the inner peripheral surface of the outer annular wall 23 and the outer peripheral surface of the inner annular wall 24 are formed by annular grooves.
22 is formed to be inclined so as to gradually widen upward. An active metal brazing material is disposed on the bottom surface of the annular groove 22, and the sealing metal 9 and the output conductor 11 are connected to the annular groove 22 by heating.

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. Metal 9 and output conductor 11
Even if the brazing portions are close to each other, a sufficient insulation distance between the sealing metal 9 and the output conductor 11 can be secured by the outer annular wall 23 and the inner annular wall 24. Accordingly, the distance between the bottom surfaces of the annular grooves 22 can be reduced, and the amount of protrusion of the output conductor 11 from the anode body 1 can be reduced.

Further, the inner annular wall 24 is formed lower than the outer annular wall 23. The inner annular wall 24 prevents discharge between the sealing metal 9 and the output conductor 11 in the vacuum tube, and is used in a vacuum. It is sufficient if the inner annular wall 24 has a height sufficient to cover the brazing portion between the sealing metal 9 and the insulating cylinder 21 and the brazing portion between the output conductor 11 and the insulating cylinder 21 because discharge is unlikely to occur. Discharge can be prevented, and the material and the like can be reduced by forming the inner annular wall 24 lower than the outer annular wall 23.

The surfaces of the outer annular wall 23 and the inner annular wall 24 on the annular groove 22 side, that is, the inner peripheral surface of the outer annular wall 23 and the outer peripheral surface of the inner annular wall 24,
Since the annular groove 22 is formed to be inclined so as to gradually widen upward, the mechanical strength of the outer annular wall 23 and the inner annular wall 24 can be improved, and the sealing metal 9 and The output conductor 11 can be easily mounted.

In the present embodiment, annular grooves are formed at both opening edges of the insulating cylinder 21.
Although the ring 22 is formed, the annular groove 22 may be formed only on one of the opening edges of the insulating cylinder 21, and the sealing metal 9 or the output conductor 11 may be mounted on the bottom of the annular groove 22. .

(G) Effects of the Invention As described above, according to the present invention, the discharge between the sealing metal and the output conductor can be prevented by the outer annular wall and the inner annular wall, and the insulating cylinder and the sealing metal can be connected to each other. There are advantages such as that the distance between the connection portion and the connection portion between the insulating cylinder and the output conductor can be reduced to reduce the amount of protrusion of the output conductor from the anode body.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of one embodiment of the present invention, FIG. 2 is an enlarged sectional view of the insulating cylinder, and FIG. 3 is a conventional sectional view. 1 ... Anode body, 2 ... Vane, 4 ... Antenna conductor, 9
... sealing metal, 11 ... output conductor, 21 ... insulating cylinder, 22 ...
... annular groove, 23 ... outer annular wall, 24 ... inner annular groove.

Claims (1)

(57) [Claims] 1. A tubular anode body having a plurality of vanes, a tubular sealing metal connected to an opening of the anode body, and one opening edge connected to the opening of the sealing metal. An insulating cylinder, an output conductor having one end connected to the other opening edge of the insulating cylinder, an annular groove formed at at least one opening edge of the insulating cylinder, and an outer periphery of the annular groove Outer annular wall on the side,
A magnetron, wherein an inner annular wall is formed inside an annular groove, and the sealing metal or the output conductor is connected to a bottom surface of the annular groove.