Automatic heating appliance with ultrasonic sensor

A heating appliance with a heating chamber, comprising:

• heating means for heating an object to be heated which is encased in said heating chamber;
• turntable means provided in said heating chamber and arranged to be rotatable, said object being placed on said turntable means;
• ultrasonic sensor means for transmitting an ultrasonic wave toward said object and receiving an echo wave returning therefrom;
• weight sensor means for sensing the weight of said object placed on said turntable means;
• and
• control means for controlling said ultransonic sensor means so as to repeatedly transmit and receive an ultransonic wave and calculate distances of said object from said ultransonic sensor means on the basis of the transmission and reception of the ultransonic wave, said control means determining the volume of said object on the basis of the successively calculated distances and calculating the density of said object on the basis of the determined volume and the weight sensed by said weight sensor, said control means controlling said heating means in accordance with the calculated density of said object.

A heating appliance with a heater chamber, comprising:

• heating means for heating an object to be heated which is encased in said heating chamber;
• turntable means provided in said heating chamber and arranged to be rotatable, said object being placed on said turntable means;
• distance-measuring means for repeatedly measuring the distance from said object;
• and
• control means for determining the heating condition of sad object on the basis of the distances repeatedly measured by said distance-measuring means and for controlling said heating means in accordance with the result of the determination.

A heating appliance with a heating chamber, comprising:

• heating means for heating an object to be heated which is encased in said heating chamber;
• turntable means provided in said heating chamber and arranged to be rotatable, said object being placed o said turntable means;
• distance-measuring means for repeatedly measuring the distance from said object;
• weight sensor means for sensing the weight of said object placed on said turntable means;
• and
• control means for determining the volume of said object on the basis of the distances repeatedly measured by said distance-measuring means and for calculating the density of said object on the basis of the determined volume and the weight sensed by said weight sensor means, said control means controlling said heating means in accordance with the calculated density of said object.