Magnetron and high-frequency heating apparatus having the same

A magnetron comprising:

• a yoke;
• an anode unit comprising an anode cylinder placed in the yoke and having a working space, a plurality of vanes radially arranged about an axis of the working space, and a first pole piece and a second pole piece respectively installed at both sides of the anode cylinder;
• a cathode unit placed in the working space and having a filament spaced apart from the plurality of vanes;
• an output unit having an antenna lead connected to any one vane among the plurality of vanes to transmit high-frequency microwaves generated by the anode unit and the cathode unit to the outside of the yoke;
• an input unit having an input terminal connected to the cathode unit to supply power to the cathode unit;
• and
• a filter unit having a filter box to cover the input unit, a condenser penetrating the filter box, and a plurality of filters arranged in the filter box and connected between the condenser and the input unit,
• wherein each of the plurality of filters comprises a choke coil, and
• wherein the choke coil comprises a magnetic substance core having a diameter of 4.0±0.2 mm and a length of 15 mm, a first coil and a second coil wound around the magnetic substance core, a first connection portion connecting the first coil and the second coil to each other, a third coil connected to the second coil, a fourth coil located at one side of the third coil, and a second connection portion connecting the third coil and the fourth coil to each other.

A high-frequency heating apparatus using high-frequency microwaves generated by a magnetron,

• wherein the magnetron comprises:
• a yoke;
• a cathode unit placed in the yoke and having a filament to discharge thermo-electrons by being heated upon receiving power;
• an anode unit comprises an anode cylinder placed in the yoke and having a working space in which an electric field is created, a plurality of vanes radially arranged about an axis of the working space and spaced apart from the filament to generate a group of electrons using the thermo-electrons, and a first pole piece and a second pole piece respectively installed at both sides of the anode cylinder;
• a first magnet and a second magnet placed in the yoke at both ends of the anode unit, respectively, to generate a magnetic field;
• and
• an output unit having an antenna lead connected to any one vane among the plurality of vanes to transmit high-frequency microwaves generated via rotation of the group of electrons under the influence of the magnetic field and the electric field to the outside of the yoke,
• wherein the first pole piece of the anode unit comprises a first flat portion, a slope formed at an inner side of the first flat portion, a second flat portion formed at an inner side of the slope and having a diameter from 9.5 mm to 10.5 mm, a first hole formed in the second flat portion at a position corresponding to the working space and having a diameter from 8 mm to 8.2 mm, and a second hole formed in the slope for penetration of the antenna lead,
• wherein the second pole piece of the anode unit comprises a first flat portion, a slope formed at an inner side of the first flat portion, a second flat portion formed at an inner side of the slope and having a diameter different from the diameter of the second flat portion of the first pole piece, and the first hole formed in a center of the second flat portion at the position corresponding to the working space and having a diameter different from the diameter of the first hole of the first pole piece.