Abstract: To provide a magnetron capable of effectively suppressing a plurality of higher harmonic wave components with a simple configuration. A magnetron 1 is designed so that: a choke part 60 consisting of a first choke 30 and a second choke 32 being a plurality of chokes provided on the inside of a metal sealing body 7 on an output unit 5 are provided to suppress higher harmonic waves; and a plurality of choke grooves 31A, 31B and 31C that correspond to each of higher harmonic wave components larger than the number of the first choke 30 and second choke 32 and different in each frequency are formed by the choke part 60 and the metal sealing body 7.

Abstract: To provide a magnetron capable of balancing cost reduction and effective suppression of high frequency components. A choke 30 is formed as a separated part from an output side metal sealing body 7. A Cu-plated metal layer 7C is formed on the metal sealing body 7, and a Sn-plated metal layer 30F which is cheaper and has a lower melting point than the Cu-plated part is formed on the choke 30. Thereby, in a brazing process, the tightly-adhered part of the Cu-plated part on the metal sealing body 7 and the Sn-plated part on the choke 30 is melted and becomes Cu-Sn alloy, and the choke 30 is joined to the metal sealing body 7 as firm as the case of using brazing materials. Thus, plating costs and brazing costs can be reduced; it enables to balance cost reduction and effective suppression of high frequency components in comparison with conventional magnetrons.

Abstract: To provide a magnetron capable of effectively suppressing a plurality of higher harmonic wave components with a simple configuration. A magnetron 1 is designed so that: a choke part 60 consisting of a first choke 30 and a second choke 32 being a plurality of chokes provided on the inside of a metal sealing body 7 on an output unit 5 are provided to suppress higher harmonic waves; and a plurality of choke grooves 31A, 31B and 31C that correspond to each of higher harmonic wave components larger than the number of the first choke 30 and second choke 32 and different in each frequency are formed by the choke part 60 and the metal sealing body 7.

Abstract: Provided is a low-cost magnetron that is excellent in productivity without any adverse effect on characteristics. Two large and small strap rings 11 (11A and 11B) are only disposed at lower ends, or input sides, of a plurality of vanes 10 (10A and 10B) in the direction of a tube axis m. Diameter Rip of a protruding flat surface 41 of an input side pole piece 18 is larger than diameter Rop of a protruding flat surface 40 of an output side pole piece 17. Therefore, it is possible to provide a practical magnetron without a significant decrease in productivity or characteristics from a conventional one, while cutting costs by reducing the number of parts with the use of two strap rings on one side.

Abstract: Provided is a low-cost magnetron that is excellent in productivity without any adverse effect on characteristics. Two large and small strap rings 11 (11A and 11B) are only disposed at lower ends, or input sides, of a plurality of vanes 10 (10A and 10B) in the direction of a tube axis m. Diameter Rip of a protruding flat surface 41 of an input side pole piece 18 is larger than diameter Rop of a protruding flat surface 40 of an output side pole piece 17. Therefore, it is possible to provide a practical magnetron without a significant decrease in productivity or characteristics from a conventional one, while cutting costs by reducing the number of parts with the use of two strap rings on one side.

Abstract: A magnetron has an anode cylinder, ten vanes, three strap rings. The ten vanes are fixed to an inner surface of the anode cylinder and arranged in a radial pattern of which center is at an axis of the anode cylinder. Each of the three strap rings connects vanes that are alternatively arranged. A first strap ring and a third strap ring are arranged on a first end of the vanes in a direction of axis, and a second strap ring is arranged on a second end that is opposite to the first end. Outer diameter of the second strap ring is equal to inner diameter of the first strap ring and outer diameter of the third strap ring is equal to inner diameter of the second strap ring.

Abstract: A magnetron for microwave oven has an anode cylinder, vanes (height: H (mm)), a cathode spirally extending along the central axis, a pair of end hats (outer diameter: DEH1 (mm), DEH2 (mm)) fixed to both ends of the cathode, and a pair of pole pieces. Vanes extend from an inner surface of the anode cylinder to the central axis. Free ends of the vanes form a vane inscribing circle (diameter: Da (mm)). Pole pieces expand like funnels from through-holes (inner diameter: DPP1 (mm), DPP2 (mm)) facing to the end hats and pinch the cathode. The shape of the magnetron satisfies, H?8.5, H/Da?0.95, DEH1/DPP1?0.8, DEH1/DPP2?0.8, DEH2/DPP1?0.8, DEH2/DPP2?0.8, 0.92?Da/DPP1?0.95, and 0.92?Da/DPP2?0.95.

Abstract: A magnetron has an anode cylinder, ten vanes, three strap rings. The ten vanes are fixed to an inner surface of the anode cylinder and arranged in a radial pattern of which center is at an axis of the anode cylinder. Each of the three strap rings connects vanes that are alternatively arranged. A first strap ring and a third strap ring are arranged on a first end of the vanes in a direction of axis, and a second strap ring is arranged on a second end that is opposite to the first end. Outer diameter of the second strap ring is equal to inner diameter of the first strap ring and outer diameter of the third strap ring is equal to inner diameter of the second strap ring.

Abstract: A magnetron for microwave oven has an anode cylinder, vanes (height: H (mm)), a cathode spirally extending along the central axis, a pair of end hats (outer diameter: DEH1 (mm), DEH2 (mm)) fixed to both ends of the cathode, and a pair of pole pieces. Vanes extend from an inner surface of the anode cylinder to the central axis. Free ends of the vanes form a vane inscribing circle (diameter: Da (mm)). Pole pieces expand like funnels from through-holes (inner diameter: DPP1 (mm), DPP2 (mm)) facing to the end hats and pinch the cathode. The shape of the magnetron satisfies, H?8.5, H/Da?0.95, DEH1/DPP1?0.8, DEH1/DPP2?0.8, DEH2/DPP1?0.8, DEH2/DPP2?0.8, 0.92?Da/DPP1?0.95, and 0.92?Da/DPP2?0.95.

Abstract: At an oscillation frequency of 2450 MHz band, number of the vanes constituting the anode part of the magnetron being, the diameter 2ra of the circle inscribing tip portions of the vanes on the cathode side being 8.0 to 8.8 mm, the diameter 2rc of the outer periphery of the filament constituting the cathode part being 3.5 to 3.9 mm, the height A3 of the vane in the direction of the tube axis is 7.0 to 8.0 mm, the mutual distance A1 between the bases of the pair of funnel-shaped pole pieces fixed to both sides of the anode part being 21.5 to 23.5 mm, the mutual distance A2 between the bottom portions of the pair of pole pieces being 10.2 to 11.2 mm, the inner diameter P1 of the through-hole of the pole piece being 8.3 to 8.5 mm, and the outer diameter P2 of the bottom portion being 11.0 to 16.0 mm are set up.