JPH04259737A - Magnetron - Google Patents

Abstract

PURPOSE:To reduce the failure ratio of silver brazing work and improve the productivity by thickening the plate thickness from the connecting part of a vane with an inside uniform pressure ring having a small diameter to the working space side end part in a magnetron anode body structure. CONSTITUTION:An inner strap ring 3 is disposed in a determined position, and the connecting protruding part 4 of the ring 3 is fitted to the fitting part 5 of the part 1a of a vane 1 in which the plate thickness near the working space side end part is thickened. Even if the positioning between the vane 1 and the ring 3 is slightly imprecisely conducted, the protruding part 4 of the ring 3 is brought into the state fitted to and in contact with the vane 1 over the whole end surface in the connecting part between the ring 3 and the vane 1, and silver brazing can be certainly performed. Thus, the failure ratio of the silver brazing work can be reduced to improve the productivity, and a satisfactory electric characteristic for magnetron can be provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetron anode structure in which electrical connection work such as brazing between a vane and an inner pressure equalizing ring (inner strap ring) having a small diameter can be easily and reliably performed.

0002

[Prior Art] In order to connect equipotential points of a group of cavity resonators arranged inside an anode cylinder when a magnetron is oscillating in the so-called π mode, an outer strap ring with a large diameter and an outer strap ring with a large diameter are used. Using a small inner strap ring, the vanes are divided into two sets of every other vane, with one set of vanes connected only to the outer strap ring and the other set of vanes connected only to the inner strap ring. The inner and outer large and small strap rings are installed parallel to each other in a groove provided on the end face of the cylindrical axis of the vane, and the outer strap ring is connected to one set of vanes with a connecting portion that protrudes outward. , the inner strap ring is connected to the other set of vanes by an inwardly projecting connection. By doing this, the electrical phases of adjacent vanes are shifted by 180°, and stable π
Mode oscillation can be performed.

FIG. 5 is a top view of a conventional magnetron anode structure, in which 1 is a vane, 2 is an anode cylinder, 3 is an inner strap ring, 4 is a connecting protrusion protruding inward from the inner strap ring, and 6 is a top view of a conventional magnetron anode structure. There is an outer strap ring. Moreover, FIG. 3 is a sectional view taken along the line AA' shown in FIG.

[0004] The connection points between the strap ring and the vane are soldered with silver. Conventionally, the plate thickness of the vane and the width of the end of the connecting protrusion of the strap ring were approximately the same dimension. The structure of such an anode portion is disclosed in, for example, Japanese Patent Laid-Open No. 61-45540.

[0005]

[Problems to be Solved by the Invention] However, with the conventional structure as described above, in some mass-produced magnetrons, the connecting protrusion of the strap ring is not accurately aligned with the vane and may be misaligned. In some cases, they were soldered with silver. If silver soldered in that way,
A problem has been that the circumferential width of the area where the strap ring and the vane are actually connected (therefore, the area of the connection part) is narrower than the design value.

An object of the present invention is to provide a magnetron anode structure that can suppress the occurrence of the conventional problems as described above.

[0007]

[Means for Solving the Problem] In order to achieve the above object, in the present invention, an even number of vanes protrude radially from the inner periphery of an anode cylinder, and the anode cylinder and vanes are used to form a cathode located at the center of the cylinder. A group of cavity resonators is formed by surrounding the air in a circle with an action space in between, and every other vane is alternately made of pressure equalizing rings of different sizes with different diameters, so that the connection points with the vanes are at equipotential points. In the connected magnetron anode structure, from the connection of the vane with the smaller diameter inner equalizing ring,
We decided to increase the thickness of the plate up to the end on the working space side.

[0008]

[Operation] If the above-mentioned method is adopted, the width of the connecting protrusion of the inner strap ring will be larger than the width of the fitting part of the vane that should be fitted to this protrusion, and the inner strap ring and the vane will be connected to each other. Even if the alignment of the inner strap ring and the vane is slightly out of alignment, at the connection point between the inner strap ring and the vane, the connecting protrusion of the inner strap ring will fit and contact the vane over the entire end surface, and silver soldering will be ensured. . It has been confirmed that even if the plate thickness near the end of the vane on the working space side becomes somewhat thicker according to the present invention, there is no problem in terms of the electrical characteristics of the magnetron. Since the magnetron is a mass-produced product, even increasing the margin of alignment between the vane and the inner strap ring has a large effect on production.

[0009]

[Embodiment] Fig. 1(a) is a perspective view showing the vicinity of the thick working space side end of the vane to be connected to the inner strap ring according to an embodiment of the present invention. 5 is a thickened portion of the vane according to the present invention, and 5 is a fitting portion of the vane that is to be fitted with a connecting protrusion of the inner strap ring. Note that achieving such a structure requires a processing method in which the anode cylinder and the vanes protruding radially from its inner periphery are integrally formed at once by hobbing.
There is no difficulty and there is no increase in the number of man-hours.

FIG. 1(b) shows a portion 1a of the above embodiment in which the inner strap ring 3 is placed at a predetermined position and the thickness of the plate near the end of the vane 1 on the action space side is increased. FIG. 3 is a perspective view showing a state in which the connecting protrusion 4 of the inner strap ring 3 is fitted into the fitting part 5 shown inside. In this way, even if the alignment between the vane 1 and the inner strap ring 3 is performed somewhat inaccurately, the area of the electrical connection between the two will not fall below the predetermined design value, and the silver soldering is performed reliably, and good electrical characteristics of the magnetron are obtained.

FIG. 2 is a perspective view showing the vicinity of the thick working space side end of the vane to be connected to the inner strap ring in another embodiment of the present invention, which is different from the case shown in FIG. 1(a). Identical parts are given the same reference numerals. In the embodiment shown in FIG. 2, the width (thickness) of a part of the recessed part of the vane into which the strap ring is to be inserted is also increased, making it easier to process than the embodiment shown in FIG. 1(a). . Figure 3 shows a plan view of the anode structure in which the strap ring is connected to the vane with the structure shown in Figure 2.
Shown below. In FIG. 3, the same parts as shown in FIG. 5 are given the same reference numerals. As shown in FIG. 3, even if the inner strap ring 3 is slightly shifted in the rotational direction, the connecting protrusion 4 of the inner strap ring 3 and the fitting part of the working space side end 1a of the anode vane 1 are fitted with a sufficiently large area and connected. It turns out that it will be done.

FIG. 4 shows a plan view of an anode structure using a vane in which the thickness of the plate is thickened at the portion where the outer strap ring 6 is to be connected. This is the fitting part of the vane that is connected by fitting and abutting. With this structure, even if not only the inner strap ring but also the outer strap ring is slightly misaligned in the rotational direction, the connection between the vane and the strap ring is not impaired, so reliability can be further improved.

[0013]

As described above, according to the present invention, the defective rate of silver brazing of the electrical connection between the inner strap ring and the vane is reduced, and mass productivity and reliability are improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, in which (a) is a perspective view showing the vicinity of the thick working space side end of the vane according to the present invention;
(b) is a perspective view showing a state in which the connecting protrusion of the inner strap ring is fitted into the thickened fitting part of the vane.

FIG. 2 is a perspective view showing the vicinity of a thick working space side end of a vane according to another embodiment of the present invention.

FIG. 3 is a plan view of the anode structure of the embodiment in which a strap ring is fitted and connected to the vane shown in FIG. 2;

FIG. 4 is a plan view showing still another structural example of the anode structure.

FIG. 5 is a top view of a conventional magnetron anode structure.

6 is a sectional view taken along the line A-A' shown in FIG. 5. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1...Vane, 1a...Thickened part of the vane according to the present invention, 2...Anode cylinder, 3...Inner strap ring, 4...Connection protrusion of inner strap ring,
5...Bane fitting part, 6...Outer strap ring.

Claims (1)

[Claims] Claim 1: An even number of vanes protrudes radially from the inner periphery of an anode cylinder, and the anode cylinder and the vanes form a cavity resonator group that circularly surrounds a cathode located at the center of the cylinder with an action space in between. , and in a magnetron anode structure in which every other vane is connected alternately with large and small pressure equalizing rings with different diameters so that the connection points with the vanes are equipotential points, the inner pressure equalizing ring with a smaller diameter of the vane A magnetron characterized by a thicker plate from the connecting part to the end on the working space side.