JPS581499B2 - magnetron - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetron in which an anode resonator is disposed within a cylinder serving as a wall of a vacuum chamber.

In this type of magnetron, the conductive metal body constituting the anode resonator, such as the vane, is attached inside the cylinder with brazing material, but the adhesive surface between the metal body and the cylinder, which is conventionally rejected, is uniformly attached. It was difficult to spread the brazing material.

The present invention has been made in view of the above points, and will be explained with reference to the figures below. Reference numeral 1 denotes an anode body consisting of a cylinder 2 with open ends and an end plate 3 closing both open ends, and is made of a magnetic material such as Fe or Fe alloy. It forms the wall of the vacuum chamber and forms its own magnetic path.

4, 4 are a pair of permanent magnets attached to the inner surface of the end plate 3 by spot welding, 5, 5... are a plurality of vanes attached to the inner circumferential surface of the cylinder 2, 6 is a vane 5, A directly heated coiled cathode is positioned in a working space surrounded by 5 and supported by a pair of end hats 7.

Reference numeral 8 denotes a support and lead rod for the cathode 6, which is drawn out through through holes provided in one of the magnets 4 and one of the end plates 3, respectively.

Reference numeral 9 denotes an output antenna combined with one of the vanes 5, 5, .

A plurality of cooling fins 12 are attached directly to the outer periphery of the anode body 1 for thermal conduction, and are formed into a donut shape and fitted into the cylinder 2.

A closed magnetic circuit is formed by the anode body 1, and a predetermined magnetic energy is applied to the working space.

Also, the space surrounded by the anode body 1, the dome 11 that protects the antenna, and the stem 13 that surrounds the lead rod is evacuated to complete the magnetron.

Now, the feature of the present invention is that a spiral groove 15 is carved in the inner circumferential surface of the cylinder 2 to which the vanes are attached, and the vanes 5, 5, etc. are attached to this spiral groove 15, and the solid silver Brazing material 14
The vanes 5, 5, . . . are fixed to the cylinder 2 by melting it with heat and pouring it into the spiral groove 15.

By doing so, the silver brazing material 14 easily flows along the spiral groove 15, and therefore, the adhesive surface between each vane 5 and the cylinder 2 passes through the groove 15 and due to the surface tension between the grooves. Since the silver brazing material 14 spreads more uniformly, the mechanical and electrical fixation between the two becomes strong and reliable.

In the above structure, the conductive film made of silver brazing material extending between the vanes on the inner circumferential surface of the cylinder 2 and each vane substantially constitute an anode resonator.

Therefore, the presence of such a conductive film ensures sufficient oscillation efficiency even if the cylinder 2 is made of a magnetic material with low conductivity as in the embodiment.

Furthermore, by limiting the groove 15 carved on the inner circumferential surface of the cylinder 2 to the attachment range of the vane 5 as in the embodiment, the spread range of the brazing material 14 can be suppressed to only the necessary area, thereby reducing the need for the expensive brazing material 14. There will be no waste.

This effect is remarkable compared to the spread of the brazing material 14' when no groove is provided on the inner surface of the anode body 1' to which the vane 5' is attached, as shown in FIG.

As is clear from the above description, according to the present invention, in a magnetron in which an anode resonator is disposed within a cylinder that serves as the wall of a vacuum vessel, a spiral groove is carved on the inner circumferential surface of the cylinder, and a spiral groove is formed in the inner peripheral surface of the cylinder. Since the conductive metal body constituting the anode resonator is attached inside the cylinder by pouring the brazing metal, it is possible to spread the brazing metal uniformly on the adhesive surface between the conductive metal body and the cylinder. ,
The electrical and mechanical adhesion between the two becomes strong and reliable.

In addition, the brazing material poured into the spiral groove spreads over the inner peripheral surface of the cylinder and forms a highly conductive film, so the conductive metal bodies are electrically connected to each other, making the cylinder conductive. It can be constructed from a magnetic material with low magnetic properties, and is extremely advantageous in terms of cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the magnetron of the present invention, FIG. 2 is an enlarged sectional view of the same essential part, and FIG. 3 is a sectional view illustrating a conventional structure. 1... Anode body, 5... Vane, 4...
... Permanent magnet: 15 ... Spiral groove, 14.
... Conductive brazing material.

Claims (1)

[Claims] 1. In a magnetron in which an anode resonator is disposed within a cylinder made of a magnetic material that forms the wall of a vacuum vessel, a spiral groove is carved on the inner peripheral surface of the cylinder, and a brazing material is poured into the groove. A magnetron characterized in that a plurality of conductive metal bodies constituting an anode resonator are attached within the cylinder, and the plurality of conductive metal bodies are connected to each other with good conductivity using the brazing material.