Magnetron and method of adjusting resonance frequency of magnetron

A magnetron comprising:

• an anode cylinder that extends in a cylindrical shape along a central axis;
• a plurality of tabular vanes each of which has at least one end fixed to the anode cylinder and that extend toward the central axis from an inner surface of the anode cylinder;
• and
• one or a plurality of pressure-equalizing rings that are disposed coaxially with respect to the central axis of the anode cylinder,
• wherein each of the tabular vanes include:
• first penetration holes that are formed to penetrate through the tabular vanes in a circumferential direction and not to be in contact with the pressure-equalizing rings;
• second penetration holes that are formed to penetrate through the tabular vanes in the circumferential direction and to be adjacent to the first penetration holes;
• and
• partitions that are formed between the first penetration holes and the second penetration holes and face the pressure-equalizing rings disposed in the first penetration holes,
• wherein the partitions are deformed toward a side of the pressure-equalizing rings disposed in the first penetration holes or opposite sides to the first penetration holes when applied with force.

A method of adjusting a resonance frequency of a magnetron the method comprising:

• forming protrusions facing a pressure-equalizing ring in tabular vanes in an axial direction of an anode cylinder, wherein the anode cylinder extends in a cylindrical shape along a central axis and each of a plurality of tabular vanes has at least one end fixed to the anode cylinder and extends toward the central axis from an inner surface of the anode cylinder;
• forming a plurality of notches that are grooves formed in a base part of the protrusions at predetermined intervals, wherein the plurality of notches are base points for deforming the protrusions;
• and
• deforming, using the plurality of notches, the protrusions toward sides of the pressure-equalizing rings to adjust the resonance frequency of the magnetron.

A method of adjusting a resonance frequency of a magnetron including an anode cylinder that extends in a cylindrical shape along a central axis, a plurality of tabular vanes each of which has at least one end fixed to the anode cylinder and that extend toward the central axis from an inner surface of the anode cylinder, and one or a plurality of pressure-equalizing rings that are disposed coaxially with respect to the central axis of the anode cylinder, the method comprising:

• a step of forming first penetration holes which penetrate through the tabular vanes in a circumferential direction and are not in contact with the pressure-equalizing rings;
• a step of forming second penetration holes which penetrate through the tabular vanes in the circumferential direction and are adjacent to the first penetration holes;
• and
• a step of forming partitions which face the pressure-equalizing rings disposed in the first penetration holes between the first penetration holes and the second penetration holes,
• wherein, in a case where the resonance frequency of the magnetron is adjusted, the partitions are deformed toward sides of the pressure-equalizing rings disposed in the first penetration holes or opposite sides to the first penetration holes.