JPS62202755U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a magnetron according to an embodiment of the invention, FIGS. 2 and 3 are exploded perspective views and cross-sectional views showing essential parts of FIG. 1, and FIGS. 4 and 5. The figure is a cross-sectional view showing a modification of this invention.
The figure is a sectional view showing a conventional magnetron. 11... Anode cylinder, 12, 19... Magnetic pole, 13
, 20... Metal container, 14, 25... Permanent magnet,
31, 32... small protrusion.

Claims (1)

[Claims for Utility Model Registration] (1) Magnetic poles are attached directly or separately to both ends of the anode cylinder, a cylindrical metal container is fixed to the magnetic poles and the anode cylinder, and an annular metal container is attached to the outside of the cylindrical metal container. A magnetron fitted with a permanent magnet, characterized in that the outer peripheral surface of the cylindrical metal container is provided with three or more small protrusions that locally touch the inner peripheral surface of the annular permanent magnet. . (2) The magnetron according to claim 1, wherein the cylindrical metal container is made of a weakly magnetic metal or a non-magnetic metal with a thermal conductivity lower than that of the magnetic pole material. (3) The magnetron according to claim 1, wherein a high heat resistance member made of a weakly magnetic metal or a nonmagnetic metal and having a lower thermal conductivity than the magnetic pole material is interposed in a part of the anode cylinder. (4) The anode cylinder and the magnetic pole are separated, the magnetic pole is joined to a part of the cylindrical metal container, and an extension of the cylindrical metal container is located between the anode cylinder and the magnetic pole to provide high thermal resistance. The magnetron according to claim 3 of the utility model registration claim forming part of this section.