Patent ID: 8247744

Claim:
A cooking device comprising: a heating source operable to heat an object to be heated; a top plate provided on an upper surface of the cooking device; a touch key that is provided on the top plate and is operable to input an assigned control command by being touched with a finger; a cancel electrode provided on a lower surface of the top plate at a periphery of the touch key; and a control unit operable to control electricity conduction to the heating source based on the control command and detect whether or not a portion of the top plate near the cancel electrode is touched with the finger; wherein the control unit outputs a high frequency signal to the cancel electrode, wherein when detecting that the portion of the top plate near the cancel electrode is touched with the finger by detecting that an impedance between the cancel electrode and an earth is lowered by greater than or equal to a predetermined value compared to when the portion of the top plate near the cancel electrode is not touched with the finger, the control unit maintains a condition of the electricity conduction to the heating source during time of the detection, and limits an operation based on the control command input to the touch key while detecting that the portion of the top plate near the cancel electrode is being touched with the finger, and wherein the cancel electrode is arranged to surround the touch key with a near side of the top plate opened.