| 摘要 |
PROBLEM TO BE SOLVED: To improve the structure of an antenna sensor and a fastening system of a magnetic field detecting device to heighten the reliability of detected data by grounding a wire of an antenna sensor on the outside of a waveguide tube. SOLUTION: A magnetic field detecting device of a microwave oven is formed by an antenna sensor 500 inserted in the inside of a waveguide tube 10 and a shield member 502 for stably fixing the sensor 500. The sensor 500 has a semicircular loop in the central part thereof, which is inserted in the inside through an insert hole 50a formed in one side wall surface of the waveguide tube 10. The shield member 502 can be inserted in the insert hole 50a with the loop shape of the sensor 500 stably fixed, and air-tight coupling is made to keep microwaves in the waveguide tube 10 from leaking out to the outside. On the other hand, each end of the sensor 500, that is, both sides of the rear end of the coupling part to the shield member 502 are exposed to the outside of the waveguide tube 10, thereby inducing voltage generated by the magnetic field in the waveguide tube 10.
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