Tokyo Shibaura Denki Kabushiki Kaisha

Hikaru Matsuzaki

Toshiyuki Matsuzaki

Masataka Komine

Tatsuo Simizu

A magnetron anode constructed by welding a pole piece to each open end of a copper anode cylinder. A nickel layer is plated on the surface of the pole piece. A welded mass resulting from welding the pole piece to the open end of the anode cylinder covers the peripheral edge of the pole piece. The welded is mostly formed of a nickel-copper alloy resulting from the mutual fusion of the copper material of the anode cylinder and the nickel of the nickel layer.

Magnetic anode and a method of manufacturing the same

An anode cylinder of a magnetron is formed of a rectangular copper plate member. The plate member is curved in a rolling process to be formed into a cylindrical primary workpiece. In a first cold extrusion process, the primary workpiece is forced successively into a first die having an inner diameter shorter than the outer diameter of the primary workpiece and a second die having an inner diameter shorter than that of the first die and arranged in line with the first die. Thus, the primary workpiece is continuously reduced in its outer diameter to be formed into a secondary workpiece. The thickness reduction rate of the primary workpiece used during its passage through each of the first and second dies is limited to 3% or less. The secondary workpiece has its unnecessary portions removed in a cutting process and its seam filled up airtightly in an airtight bonding process.

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Yokohama, Japan

Hikaru Matsuzaki