Patent ID: 8723420

Claim:
A magnetron comprising: an anode cylinder; a cathode side tube hermetically coupled to a lower portion of the anode cylinder, the cathode side tube comprising a cylindrical part extending in a substantially vertical direction and a flange part connected to the cylindrical part and extending in a substantially horizontal direction over a periphery of the cylindrical part; and a shield cylinder comprising: a cylindrical part extending in the substantially vertical direction; a flange part connected to the cylindrical part of the shield cylinder and extending in the substantially horizontal direction over an entire periphery of the cylindrical part of the shield cylinder, wherein an upper surface of the flange part of the shield cylinder faces a lower surface of the flange part of the cathode side tube; and a folded part in which a portion of the flange part of the shield cylinder is folded toward the flange part of the cathode side tube, wherein the folded part is in contact with a portion of the lower surface of the flange part of the cathode side tube, the shield cylinder being electrically coupled to the cathode side tube at a lower end of the anode cylinder.