Microwave heating appliance for automatically heating an object

Details Microwave heating appliance for automatically heating an object Microwave heating appliance for automatically heating an object

1988-04-13

1989-09-19

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055F, 99451, H05B 668

Patent

active

048683574

ABSTRACT:
A microwave heating apparatus for heating an object for cooking which is placed on a turntable in a heating chamber. The microwave heating apparatus is arranged so as to automatically determining an appropriate heating condition of the object on the basis of a distinctive feature such as configuration and density of the object. The distinctive feature of the object is obtained by successively measuring a distance between the center of the turntable and a surface of the object. The measurement of the distance therebetween is performed by means of an ultrasonic transducer which is provided on a wall of the heating chamber so as to transmit an ultrasonic wave to the object and receive an echo wave from the object, the distance therebetween being obtained on the basis of the time between the transmission of the ultrasonic wave and the reception of the echo wave.

REFERENCES:
patent: 3867606 (1975-02-01), Peterson
patent: 4434341 (1984-02-01), Busby
patent: 4672180 (1987-06-01), Kusunoki et al.

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