H - Electricity – 05 – B
Patent
H - Electricity
05
B
354/28, 327/2.4
H05B 6/68 (2006.01) F24C 7/08 (2006.01) G01G 3/16 (2006.01) G01G 21/24 (2006.01) H05B 6/80 (2006.01)
Patent
CA 1244524
ABSTRACT A heat cooking appliance which utilizes a Roberval mechanism for effecting changes in the frequency of vibration of a turntable (8) with varying weights of the food thereon. The vibration is transmitted to outside of the heating chamber by use of a magnetic field to produce an electric pulse signal outside the heating chamber. In order to positively extract this magnetically detected electric pulse signal, a yoke (24) is used in a magnetic circuit and a detector coil (10) is provided near the magnet by raising the heating chamber bottom plate, thereby strengthening the magnetic coupling. Further, for removal of electric wave noise, etc., a filter circuit (27) is provided to ensure exact extraction of the electric pulse signal corresponding to the vibration of the turntable. Then for preventing influence of other magnetism producing equipment on the electric signal, either the vibration measurement is taken while such equipment is shut down or a magnetic shielding means is provided. The weight of the food is calculated from the detected frequency of vibration of the turntable and in correspondence with the detected weight, the heating time, output and mode are controlled. The cooking appliance is particularly useful in promoting ease of operation thereof and cooking with very fine adjustments.
470264
Fetherstonhaugh & Co.
Sakamoto Kazuho
LandOfFree
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