Heating cooking appliance having weight detecting function

A heating cooking appliance having a weight detecting function and devices for generating a magnetic field including at least a high tension transformer and a fan motor, said appliance comprising

• a heating chamber for accommodating and heating food;
• a heat source for heating the food;
• a table for mounting the food thereon;
• spring means attached to said table and having a vibration frequency which varies depending on the weight of the food mounted on said table;
• means for detecting the vibration frequency of said table, which is generated when the food is mounted on said table, by converting the vibration of said table into a change in a magnetic field;
• a control circuit for calculating the weight of the food from a result of the detection of the vibration frequency of said table and controlling the heating output, heating pattern and heating time of said heat source in accordance with the calculated weight of the food;
• and
• magnetic shielding means disposed between said vibration frequency detecting means and said devices for generating a magnetic field, said magnetic shielding means preventing an undesirable magnetic influence on said detecting means.

A heating cooking appliance having a weight detecting function comprising

• a heating chamber for accommodating and heating food;
• a heat source for heating the food;
• a table which mounts the food thereon and whose vibration frequency varies depending on the weight of the food;
• means for detecting the state of the vibration of said table which is generated when the food is mounted on said table;
• and
• a processing section for calculating the weight of the food from a result of the detection of the state of the vibration of said table and processing and controlling the heating output, heating pattern and heating time of said heat source in accordance with the calculated weight of the food, said processing section employing a calculating equation for calculating the weight of the food which includes a quadratic equation m=C.sub.1 T.sup.2 +C.sub.2 T+C.sub.3, where m denotes the mass of the food, T the period of the vibration, and C.sub.1, C.sub.2 and C.sub.3 are constants.