JPH04181635A - Magnetron - Google Patents

Abstract

PURPOSE:To improve processing accuracy and reduce a processing assembly process with the constitution of an anode part simplified by dividing an anode cylindrical body into two parts in an axis direction, forming a strap ring and a vane on each cylindrical body, and sealedly joining the strap ring and the vane on a divided surface to be integrated. CONSTITUTION:An anode cylindrical body is divided into two parts in an axis direction, and a vane 4 and a first strap ring 5 electrically joining the vane 4 are integratedly formed on a first cylindrical body 2. Also a vane 4' and a second strap ring 7 electrically joining the vane 4' are integratedly formed on a second cylindrical body 3. First and second anode bodies 6 and 8 are vertically assembled to be joined with an anode tube solder 9 to form an anode body. This reduces the number of the items of parts and assembly mandays, and also the accuracy of an anode part depends only on the processing accuracy and the assembling accuracy of the first and the second anode bodies, enabling the improvement of the performance and the reliability of magnetron.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a magnetron, and particularly to the structure of its anode portion.

(b) Prior art Regarding the anode structure of a conventional magnetron, for example, Japanese Patent Laid-Open No. 61-61.344 and Japanese Utility Model Publication No. 57-2549
This can be seen in Publication No. 4, etc.

FIG. 6 is a sectional view of a typical conventional magnetron body.

20 is an anode cylinder, 21 is a plurality of vanes whose outer ends are fixed radially from the inner wall of the anode cylinder 20, 22 and 23 are strap rings that short-circuit every other vane 21, and 24 is a vane 21 25 is a filament, and 26 and 27 are filament leads that support the filament 25. 28 and 29 are magnetic pole pieces, 30 is a cathode sealing metal cylinder, 31 is a cathode insulator, 32 and 33 are sealing metal odor that seals the cathode insulator 31 and the filament leads 26 and 27, and 34 is an output side sealing. Metal tube, 35 is output insulator, 36 is antenna conductor 2
4 and is an output vibrator which is sealed and cut 9 after paper ejection.

In the above configuration, the magnetron anode section consisting of the anode cylinder 20, vane 21, and strap rings 22 and 23 is assembled as shown in FIG. 7(a). That is, the plurality of vanes 21 are fixed to the anode cylinder 20 by vane solder 37 made of silver solder, and the pair of strap rings 22 and 23 are made of silver solder so as to shorten every other vane 21. It is secured to the vane 21 by solders 38, 39.

(c) Problems to be solved by the invention As described above, in the prior art, the component structure of the anode part is extremely complicated (
In this example, the number of parts is 21 parts of 5 types), which results in an increase in the number of man-hours for processing and assembling each part. Furthermore, since the anode part of the magnetron is an important part that determines the frequency of microwaves, the processing accuracy and assembly accuracy of each of these parts becomes a factor that determines the performance of the magnetron. However, in the conventional configuration, these parts are processed separately and assembled, so the number of parts and fit is limited.
``Play'' is required, and satisfactory assembly accuracy is not necessarily achieved. In addition, each part is fixed by brazing, but brazing is more likely to cause defects due to fluctuations in the precision of the parts and brazing conditions (furnace temperature, time), etc., and the more places there are to braze, the higher the probability of this happening. Of course, it is also expensive.

Furthermore, although not shown, jigs are required for positioning and brazing these parts in predetermined positions, and the jigs for brazing these parts also require high precision.

An object of the present invention is to solve the above-mentioned problems and provide a magnetron with good workability, ease of assembly, high precision, and high performance.

(d) Means for Solving the Problems In order to solve the problems, the present invention divides the anode cylinder into two in the axial direction, and one of the divided anode cylinders is provided with a first strap ring. A first strap ring forms a vane that is electrically coupled to form a first anode body, and the other divided anode cylinder is electrically coupled to a second strap ring and a second strap ring. The combined vanes are formed to form a second anode body, and each anode body is integrally formed by sealing and joining the divided surfaces.

(E) Effect According to the present invention, compared to the conventional technology, the number of parts and assembly man-hours can be significantly reduced, and the accuracy of the anode part depends only on the processing accuracy and assembly accuracy of the first and second anode bodies. As a result, the performance and reliability of the magnetron can be improved. In addition, brazing, which is sometimes used for brazing, requires only the positioning accuracy of the first and second anode bodies in the rotational direction to be considered, which simplifies the process and reduces the number of man-hours required for machining the jig. . Furthermore, brazing reduces the number of parts and improves the reliability of the parts.

(f) Example Hereinafter, an example of the present invention will be explained with reference to FIGS. 1 to 5.

l is the anode body, 2 is the first PJh pole cylinder, the cylinder body is the second PI
J electrode cylinder body cylinder body A vane 4 is provided inside the first anode cylinder body 2.
and a first strap ring 5 that electrically connects the vane 4 are integrally formed to constitute a first anode body 6. Similarly, there is a vane 4 inside the second anode cylinder 3.
A second strap ring 7, which electrically connects the vane 4' to the second anode body 8, is integrally formed with the second anode body 8.
It consists of The first anode body 6 and the second anode body 8
are assembled vertically as shown in FIG. 3(a) and joined by an anode cylinder solder 9 to form an anode body 1.

Although not shown, another method for joining the first anode body 6 and the second anode body 8 is to join the first anode body 2 and the second anode body 3 without using a brazing material. A possible method is to plate at least one sealing joint surface with silver. This is because the brazing material used for this bonding is silver-copper based, so a similar effect can be expected.

Further, the first and second anode bodies 6. in which the first and second strap rings 5.7 and the vane 4 are integrally formed.
Regarding the forming method of No. 8, when processing accuracy, processing efficiency, and material efficiency are comprehensively considered, it can be said that integral forming by cold forging is the most suitable. In other words, according to this method, the required machining accuracy can be obtained relatively easily, the machining efficiency in mass production is good, and material loss can be greatly reduced.

By the way, as shown in FIG. 1, the vanes 4.4 must be arranged at equal pitches within the anode body 1, so the brazing of the first and second anode bodies 6.8 is sometimes difficult. A jig is required. In another embodiment of the present invention, as shown in FIG.
A convex portion 11 provided on the joint surface of the anode body is formed so as to fit into the concave portion lO, and brazing is sometimes used to position the first anode body 6 and the second anode body 8. Also, Figure 4 (
b) is a completed perspective view of the anode body 1 produced by the above method. Furthermore, FIG. 5(a) shows that the protruding portions 12 of the vanes protruding from the end faces of the first anode cylinder 2 and the second anode cylinder 3 are
The inner diameter of the anode cylinder 2 and the second anode cylinder 3 is larger than that of the anode cylinder 2 and the second anode cylinder 3, and the first anode cylinder 2 and the second anode cylinder 3 are
A groove 13 that fits into the protrusion 12 is formed on the inner surface of the anode, and the first anode body 6 and the second anode body 8 are sometimes brazed by fitting the protrusion 12 and the groove 13 together. It is used for positioning. Moreover, FIG. 5(,b) is a completed perspective view of the Fjk pole body I obtained by the above method.

(g) Effects of the Invention As described above, according to the present invention, the structure of the anode portion of the magnetron can be greatly simplified, and it is also possible to improve accuracy, reduce the number of processing and assembly steps, and reduce the number of defects in brazing.

[Brief explanation of drawings]

FIG. 1 is a top view of the magnetron anode part which is an embodiment of the present invention, FIG. 2 is a view from A-0-BWfr in FIG.
FIG. 3(a) is an exploded perspective view showing one embodiment of the present invention, FIG. 3(b) is a completed perspective view of the same, FIG. 4(a) is an exploded perspective view showing another embodiment of the present invention, and FIG. Figure 4(b) is a completed perspective view of the same.
FIG. 5(a) is an exploded perspective view showing still another embodiment of the present invention, FIG. 5(b) is a completed perspective view of the same, FIG. 6 is a sectional view of the main body of a magnetron according to the prior art, and FIG. 7 7(a) is an exploded perspective view of essential parts of a conventional magnetron, and FIG. 7(b) is a completed perspective view of the same. 1... Anode body, 2... First anode cylinder, 3... Second
anode cylinder body, 4... vane, 5 - first strap ring, 6... first anode body, 7 second strap ring, 8... second anode body, 9 - anode cylinder wax .

Claims (4)

[Claims] (1) An anode cylinder, a plurality of plate-shaped vanes whose outer ends are radially fixed to the inner wall of the anode cylinder, and the vanes arranged at the upper and lower ends of the vanes are electrically coupled alternately. 1st, 2nd
A magnetron comprising a strap ring and a cathode structure erected near each tip of the vane,
The anode cylinder is divided into two in the axial direction, and the first strap ring and the vane electrically connected by the first strap ring are integrated into one of the divided first anode cylinders. The magnetron is characterized in that the second strap ring and the vane electrically connected by the second strap ring are integrally formed in the other divided second anode cylinder. (2) A first strap ring and a vane electrically coupled to the first strap ring are connected to one of the divided anode cylinders, and a second vane is connected to the other divided anode cylinder. 2. The magnetron according to claim 1, wherein the strap ring and the vane electrically connected by the second strap ring are integrally formed by cold forging. (3) The magnetron according to claim 1, wherein the sealing joint surfaces of the divided anode cylinders are plated with silver. (4) The magnetron according to claim 1, wherein the sealing joint surfaces of the divided anode cylinders have a fitting shape.