Under this condition, in the case where the first and third sensing electrode switches 310, 331 and 332 are turned off in the same manner as in the above step so as to allow the sensing electrodes 212, 222, 232, and 242 of {TAIL ~ the fixed capacitor} to enter a floating state, and the voltage of {HEAD ~ the coupling} electrodes 211, 221, 231, and 241 is changed to the voltage of V2, charges are applied to the fixed capacitance having a charge of ‘0’ 
Under this condition , in the case where the first and third sensing electrode switches 310 , 331 and 332 are turned off in the same manner as in the above step so as to allow the sensing electrodes 212 , 222 , 232 , and 242 of { TAIL ~ the fixed capacitor } to enter a floating state , and the voltage of { HEAD ~ the coupling } electrodes 211 , 221 , 231 , and 241 is changed to the voltage of V2 , charges are applied to the fixed capacitance having a charge of ‘ 0 ’
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