| 摘要 |
PROBLEM TO BE SOLVED: To generate microwave radiation having asymmetrical directivity with respect to the tube axis of a waveguide by devising the structure of an opening part to resultantly equalize a heating distribution in a heating chamber when the tube axis does not coincide with the center line of a wall surface of the heating chamber. SOLUTION: Since the opening part 5 is formed only on one side when viewed from the tube axis 10 of the waveguide, directivity toward the side having the opening part 5 can be enhanced in relation to the directivity of microwaves radiated into the heating chamber 3 from the opening part 5. In particular, when a linear heating element 13 is disposed at the center of the heating chamber, microwaves having strong directivity can be radiated toward the heating element because the waveguide 2 is disposed on the same wall surface so as to be generally parallel with the heating element 13 and the opening part 5 is formed only on the heating element 13 side when viewed from the tube axis 10. Thereby, heating by the heating element and heating by the microwaves can respectively be equalized. COPYRIGHT: (C)2004,JPO
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