MAGNETRON, MICROWAVE OVEN AND HIGH FREQUENCY HEATER

摘要

PURPOSE: A microwave oven and a high frequency heater having a magnetron are provided to reduce volume and manufacturing costs of the magnetron by maintaining a flux density uniform in the space formed between a cathode and an anode. CONSTITUTION: A magnetron comprises a circular anode body(301) forming a plurality of resonance circuits; a cathode disposed on the internal axial center of the anode body, and which emits electrons; a working space(305) formed between the cathode and the anode body; a circular magnet(306) disposed on the anode body; an upper pole piece(307) having a flux distributing structure for distributing the magnetic flux diverged from the magnet to the upper portion of the space; a lower pole piece(308) for distributing the magnetic flux diverged from the magnet to the lower portion of the space; and an upper yoke(309a) and a lower yoke(309b) for magnetically connecting the magnet with the lower pole piece.