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A polymer-type humidity sensor for use in a microwave oven and which has a polymer structure which includes a rubber and a predetermined amount of carbon, and a pair of electric terminals connected to the polymer structure. The polymer-type humidity sensor of the present invention has a rapid respon

A polymer-type humidity sensor for use in a microwave oven and which has a polymer structure which includes a rubber and a predetermined amount of carbon, and a pair of electric terminals connected to the polymer structure. The polymer-type humidity sensor of the present invention has a rapid response time, durability, excellent adherence to terminals, low hysteresis, and exhibits stability to exposures of high temperatures and high relative humidity.

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1. A polymer-type humidity sensor comprising:a polymer structure of a predetermined shape, wherein said polymer structure comprises a rubber and carbon; anda pair of electric terminals contacting said polymer structure to measure an impedance to determine a relative humidity,wherein the carbon added

1. A polymer-type humidity sensor comprising:a polymer structure of a predetermined shape, wherein said polymer structure comprises a rubber and carbon; anda pair of electric terminals contacting said polymer structure to measure an impedance to determine a relative humidity,wherein the carbon added to said polymer structure is in a range of 15-20%±5% volume. 2. The polymer-type humidity sensor of claim 1, wherein the polymer-type humidity sensor has a resistance in a range of 500 kΩ-2 MΩ. 3. The polymer-type humidity sensor of claim 1, wherein the polymer-type humidity sensor has an impedance of 2×10 6 Ω and 5×10 5 Ω at a relative humidity range of 0% and 100% and undergoes impedance change as a function of relative humidity over the whole relative humidity range. 4. The polymer-type humidity sensor of claim 1, wherein the rubber is NBR-Acrylonitrile Butadiene Rubber. 5. The polymer-type humidity sensor of claim 1, wherein the polymer-type humidity sensor has a resistance in a range of 500 kΩ-2 MΩ. 6. The polymer-type humidity sensor of claim 5, wherein the polymer-type humidity sensor has an impedance of 2×10 8 Ω and 5×10 5 Ω at a relative humidity range of 0% and 100% and undergoes an impedance change as a function of relative humidity over the whole relative humidity range. 7. The polymer-type humidity sensor of claim 6, wherein said electric terminals are situated within said polymer structure at predetermined locations and extend outward from said polymer structure. 8. The polymer-type humidity sensor of claim 6, wherein said electric terminals are situated externally and contact outer portions of said polymer structure. 9. The polymer-type humidity sensor of claim 6, wherein the predetermined shape includes a planar surface to contact a gas having humidity. 10. The polymer-type humidity sensor of claim 6, wherein the predetermined shape includes a rounded surface to contact a gas having humidity. 11. The polymer-type humidity sensor of claim 10, wherein the predetermined shape is a cylindrical shape having said electrical terminals at opposing ends. 12. The polymer-type humidity sensor of claim 10, wherein the predetermined shape is a coil shape having said electrical terminals at edges of the coil shape. 13. A polymer structure to act as a sensing structure of a polymer-type humidity sensor, comprising:a rubber; andcarbon mixed in said rubber,wherein the sensor measures an impedance of the polymer structure to determine a relative humidity, and wherein an amount of said carbon added to the polymer structure is in a range of 15-20%±5% by volume of the polymer structure. 14. The polymer structure of claim 13, wherein the rubber is NBR-Acrylonitrile Butadiene Rubber. 15. The polymer structure of claim 13, wherein the polymer-type humidity sensor has a resistance in a range of 500 kΩ-2 MΩ. 16. The polymer structure of claim 15, wherein the polymer-type humidity sensor has an impedance of 2×10 6 Ω and 5×10 5 Ω at a relative humidity range of 0% and 100% and undergoes an impedance change as a function of relative humidity over the whole relative humidity range. 17. A microwave oven to cook food comprising:a body including a cooking cavity;a heating element to cook the food in the cooking cavity;an air outlet unit to discharge air from the cooking cavity;a control unit which controls the cooking of the food; anda polymer-type humidity sensor disposed at said air outlet to obtain information on a humidity content of the discharged air for use by said control unit, wherein said polymer-type humidity sensor comprisesa polymer structure of a predetermined shape and having a rubber and carbon, anda pair of electric terminals contacting the polymer structure to measure an impedance to determine a relative humidity,wherein an amount of said carbon added to the polymer structure is in a range of 15-20%±5% by vol ume of the polymer structure. 18. The microwave oven of claim 17, further comprising a cooling fan which draws atmospheric air into the cooking cavity while cooling said heating element. 19. The microwave oven of claim 17, wherein the polymer-type humidity sensor has a resistance in a range of 500 kΩ-2 MΩ. 20. The microwave oven of claim 19, wherein the polymer-type humidity sensor has an impedance of 2×10 6 Ω and 5×10 5 Ω at a relative humidity range of 0% and 100% and undergoes an impedance change as a function of relative humidity over the whole relative humidity range. 21. The microwave oven of claim 20, wherein the rubber is NBR-Acrylonitrile Butadiene Rubber. 22. A polymer type-humidity sensor comprising:a polymer structure having opposing ends, wherein said polymer structure comprises a rubber and carbon; andelectric terminals, each contacting a corresponding one of the opposing ends of said polymer structure to measure an impedance to determine a relative humiditywherein an amount of said carbon added to the polymer structure is in a range of 15-20%±5% by volume of the polymer structure. 23. The polymer type-humidity sensor of claim 22, wherein said polymer structure is a cylindrical shape having said electrical terminals at the opposing ends of the cylindrical shape. 24. The polymer type-humidity sensor of claim 22, wherein said polymer structure comprises a prismatic shape having said electrical terminals at the opposing ends of the prismatic shape. 25 .The polymer type-humidity sensor of claim 24, wherein the prismatic shape has a rectangular cross-section. 26. A polymer-type humidity sensor comprising:a polymer structure of a predetermined shape, wherein said polymer structure comprises a rubber and carbon; anda pair of electric terminals contacting said polymer structure to measure an impedance to determine a relative humidity,wherein the polymer-type humidity sensor has an impedance of 2×10 6 Ω and 5×10 5 Ω at a relative humidity range of 0% and 100% and undergoes impedance change as a function of relative humidity over the whole relative humidity range.