Magnetron for microwave ovens

摘要

A magnetron for microwave ovens includes a positive polar cylinder, a cathode, and a plurality of vanes. The vanes constitute a positive polar section along with the positive polar cylinder. Each of the vanes is provided with a first depression to allow a large-diameter strip ring to be disposed therein, and a second depression to allow a small-diameter strip ring to be disposed therein. Each vane is provided at a cathode-side corner of the first depression with a thermion travel passage to allow thermions to smoothly flow without the hindrance of the first depression.