| 摘要 |
PURPOSE:To prevent high-frequency energies from leaking outward by allowing one turn of spiral lead wires the entire dimension of which is shorter than a working wavelength and which has a specific turn diameter to exist within the thickened part of a heating chamber wall surface through which the one turn penetrates. CONSTITUTION:In a heating chamber 1, high frequency energies of a waveform lambdaare sealed to subject a food to dielectric heating, and the food is externally heated by a sheath heater 3. Since at the end of the sheath heater 3 which penetrates through a heating chamber wall surface 2, at least one winding of the spiral lead wires 5 within the heater 3 is located within the thickened part 4 of the heating chamber wall surface, no coaxial transmission line is constituted at that part. Further, since the dimension of the entire part is set at nL<lambda, where L represents the length of one turn of the spiral lead wires 5, and n represents the number of turns, high-frequency energies advancing toward the outside of the heating chamber 1 along the sheath heater 3 do not exist. Further, since the diameter (r) of the spiral lead wire 5 is set at R/2<r<R where R represents the diameter of the through hole of the heating chamber wall surface 2, the amount of high-frequency energies leaking can be set at minimum.
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