| 摘要 |
A MICROWAVE OVEN INCLUDES A COOKING CHAMBER, A WAVEGUIDE, AND AN APPARATUS FOR GENERATING A MICROWAVE FREQUENCY ENERGY. THE APPARATUS INCLUDES A CATHODE FOR EMITTING ELECTRONS, A FIRST GRID FOR CONTROLLING AND FOCUSING THE FLOW OF ELECTRONS FROM THE CATHODE, A CHOKE STRUCTURE FOR SERVING AS A CAPACITOR, WHEREIN THE CATHODE, THE FIRST GRID AND THE CHOKE STRUCTURE DEFINE AN INPUT CAVITY FUNCTIONINGAS A RESONANT CIRCUIT, A TRIMMING RESISTOR FOR INDUCING A BIAS VOLTAGE ON THE FIRST GRID, A SECOND GRID PROVIDED ABOVE THE FIRST GRID AND HAVING A PLURALITY OF HOLES THROUGH WHICH THE ELECTRON BEAMS PASSING THROUGH THE HOLES OF THE FIRST GRID PASS, AN ANODE FOR RECEIVING THE ELECTRONS PASSING THROUGH THE HOLES OF THE SECOND GRID, COOLING FINS FOR COOLING HEAT GENERATED BY THE ANODE, A DRIVING VOLTAGE SOURCE FOR PROVIDING A DRIVING VOLTAGE THE MICROWAVE FROM AN OUTPUT CAVITY INTO THE COOKING CHAMBER VIA THE WAVEGUIDE, THE OUTPUT CAVITY BEING DEFINED BY THE SECOND GRID AND THE ANODE, AND FEEDBACK STRUCTURE FOR FEEDING A PORTION OF THE MICROWAVE FREQUENCY ENERGY BACK TO THE INPUT CAVITY. (FIG. 5)
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