| 摘要 |
PURPOSE:To prevent radio waves from leaking to the side of a weight sensor by forming a cylindrical chake chamber along the outer periphery of a shaft part between the bottom wall of a heating chamber and the weight sensor and providing a radio wave absorbing member along the outer peripheral direction of the shaft part in correspondence to the clearance of the chake chamber at the outside on the side of the weight sensor of the chake chamber. CONSTITUTION:A chake chamber 20 is constituted such that an internal dimension L from a shaft 6 to a circumference side wall 20a is set approximately lambda/4 (lambda is a wavelength) so as to make it possible to attenuate high frequency radio waves escaping to the side of the weight sensor 5 along the periphery of the shaft 6. During cooking, radio waves (high frequency waves) may escape from a gap formed between the shaft 6 and the bottom wall 1a along the circumference of the shaft 6 to the side of the weight sensor 5. However, a major part of radio waves within the box are incident into the chake chamber 20, where the radio waves are attenuated. Since there is a radio wave absorbing member at the outside of the chake chamber 20, the remaining radio waves are absorbed to the radio wave absorbing member 21. That is, radio waves do not leak into the weight sensor 5.
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