| 摘要 |
Since, food sealed tightly in a packaged does not permit steam to be released from the food during heating, conventional microwave ovens using a hygrometer cannot identify the type of food, and an automatic heating is therefore impossible. A microwave oven of the present invention includes: a temperature detector for detecting the temperature at the top of the lid of the package of a packaged food; a first calculating unit for calculating a first parameter representing a degree of rise in the detected temperature during a period of time since the heating is started until a predetermined change in the detected temperature is attained; a second calculating unit for calculating a second parameter representing a degree of rise in the temperature after the predetermined change in the temperature is attained. A controller judges the amount of food in the packaged food based on the first parameter, and judges the packing state of the packaged food based on the second parameter. Based on the judgements, or according to the parameters, the controller selects an appropriate heating mode for the packaged food out of a plurality of heating modes varying in the maximum heating time and in the maximum temperature. The heating unit (magnetron) is controlled by the controller according to the heating mode selected.
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