MAGNETRON AND MICROWAVE UTILIZATION DEVICE

摘要

Performance degradation of a magnetron is prevented by preventing a cylinder part of a metal sleeve from sinking in a recess of a pole piece even when subjected to a high pressure in the case of handling or assembly. The magnetron of the invention includes: an anode cylinder which has a cylindrical shape with both ends opened and which includes a plurality of vanes radially arranged on an inner wall surface thereof; a cathode structural body arranged inside the anode cylinder in an axial direction of the anode cylinder; a pair of pole pieces which is positioned in openings of the both ends of the anode cylinder and which forms a static magnetic field along the axial direction of the anode cylinder in an active space formed between the cathode structural body and the vanes; a pair of annular magnets arranged outside the pair of pole pieces; a magnetic yoke which is positioned outside the pair of annular magnets and forms a magnetic path for generating the static magnetic field in the active space together with the pair of pole pieces and the pair of annular magnets; and metal sleeves which are positioned outside the pair of pole pieces and configured to air-tightly seal the anode cylinder and each of which includes a cylinder part, a flange part continuous with the cylinder part, and a plurality of protrusions provided on a portion in which the cylinder part continues with the flange part.