Heating apparatus

Details Heating apparatus Heating apparatus

1990-04-17

1993-08-10

Reynolds, Bruce A.

Electric heating

Metal heating

Of cylinders

219 1055E, 219 1055F, 219 1055M, 219494, 99331, 99DIG14, H05B 664

Patent

active

052351483

ABSTRACT:
A heating apparatus such as a microwave oven in which thermal energy of high-temperature vapor generated by heating an object is detected by a pyroelectric element and a resulting detection signal is used to control (stop) a heat source such as a microwave source, etc. Among AC voltages generated by the pyroelectric element due to heat exchange of the pyroelectric element, a voltage of a polarity generated at the time of heat discharge (temperature decrease) of the pyroelectric element is selected through a circuit means. A voltage generated by heat exchange between air moving slowly in a heating chamber and the pyroelectric element caused by the rotation of a turntable or the like is eliminated by another circuit means. A control section controls the operation of the heat source by deciding an output signal of the pyroelectric element by comparing it with a detection level determined in accordance with a noise level for a predetermined length of time after the start of the heating operation. Erroneous detection is thus prevented which otherwise might be caused by a noise voltage generated in the pyroelectric element by the thermal energy of a hot air staying in the heating chamber after the energization of the heat source or second heat source.

REFERENCES:
patent: 3839616 (1974-10-01), Risman
patent: 4461941 (1984-07-01), Fukuda et al.
patent: 4587393 (1986-05-01), Ueda
patent: 4768885 (1988-09-01), Maiser
patent: 4841111 (1989-06-01), Kokkeler et al.
patent: 4918276 (1990-04-01), Oh
patent: 5015812 (1991-05-01), Kasai et al.
patent: 5051701 (1991-09-01), Kashimoto et al.

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