H - Electricity – 05 – B
Patent
H - Electricity
05
B
340/154
H05B 6/68 (2006.01) B01J 19/12 (2006.01) H05B 6/80 (2006.01)
Patent
CA 1253933
TITLE OF THE INVENTION HEATING APPARATUS WITH PIEZOELECTRIC DEVICE SENSOR ABSTRACT OF THE DISCLOSURE In an exhaust passage (37) of a heating apparatus, a piezoelectric device sensor (26) is provided for detecting the heating condition of a heated object (32), such as food in a microwave oven heating chamber (31). A piezoelectric device of the sensor may be contained within a metal casing (53) and be hermetically sealed. An output signal from the piezoelectric device sensor is processed by circuitry including an amplifier (27) having a predetermined frequency response so that only particular frequency components lower than that of a conventional a.c. supply are amplified and then compared with a threshold to detect whether a sufficient amount of moisture or hot steam is emitted from the object in the heating chamber of the heating apparatus. The invention may be applied to prevent overheating of food in a microwave oven, temperature control of chemical processes, or the like, to control heating time.
506356
Kusunoki Shigeru
Maehara Naoyoshi
Gowling Lafleur Henderson Llp
Matsushita Electric Industrial Co. Limited
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