| 摘要 |
<p>A magnetron for microwave ovens includes a positive polar cylinder (101), a cathode (106), and a plurality of vanes (500). The vanes (500) constitute a positive polar section along with the positive polar cylinder (101). Each of the vanes (500) is provided with at least one depression, preferably a first depression (501a) to allow a large-diameter strip ring (104) to be disposed therein, and a second depression (501b) to allow a small-diameter strip ring (105) to be disposed therein. Each vane (500) is provided, suitably at a cathode-side corner of the first depression (501a), with a thermion travel passage to allow thermions to smoothly flow without the hindrance of the first depression (501a). The thermion travel passage is suitably a protrusion (502a) that fills the corner of the depression (501a). <IMAGE></p> |
