Microwave oven
专利汇可以提供Microwave oven专利检索，专利查询，专利分析的服务。并且PURPOSE: To dispense with the constant temperature compensation of a detector element by dry ice or the like, by providing a compensation circuit for a detection circuit for infrared rays emitted from a heated material.
CONSTITUTION: The signal voltage V
2 of an infrared ray detector is represented as V
2 =V
1 (R
0 +ΔR)/R
2 where R
0 denotes a fundamental resistance and ΔR denotes a resistance component which fluctuates due to the of incidence the infrared rays. The DC component (V
1 /R
2 )R
2 of the signal voltage V
2 is blocked by a filter circuit 14 so that only the AC component (V
1 /R
2 )ΔR of the signal voltage is amplified to a detected amplified voltage V
3 by a detection amplifier circuit 15. The voltage V
3 is changed into a signal V
4 by a logarithmic conversion circuit 16. The signal V
4 is entered into an error compensation circuit 17. The signal voltage V
2 is also entered into the error compensation circuit 17. The signal voltage V
2 is also entered into the compensation circuit. The signal V
4 is compensated by a calculation part 17a of the circuit 17 to prevent the error due to the temperature difference between the heated material and a room. A control circuit 18 controls a high-frequency oscillation circuit 19 by a compensated signal voltage V
5 .
COPYRIGHT: (C)1979,JPO&Japio，下面是Microwave oven专利的具体信息内容。
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