Small shape recognizing capacitive sensor device

A small shape recognizing capacitive sensor device comprising:

• a number of detection elements arranged adjacent to each other;
• a number of sensor circuits connected to said detection elements, respectively;
• and
• a correction circuit for correcting an output signal level of said sensor circuit,
• said output signal level correction circuit comprising
• a calibration circuit connected to an output side of said sensor circuit,
• a calibration reference signal generation circuit for generating a calibration reference signal, and
• a comparison circuit for comparing an output from said sensor circuit with the calibration reference signal and supplying a difference output to said calibration circuit as a control signal,
• wherein said calibration circuit corrects a level of a sensor circuit output on the basis of the control signal such that the difference between the output from said sensor circuit and the calibration reference signal becomes zero, and wherein
• said sensor circuit comprises a sensor circuit with voltage-time conversion function for converting an output signal corresponding to an electric charge amount from said corresponding detection element into a signal which changes in a direction of time axis, and
• said comparison circuit compares a voltage-time conversion signal as the output from said sensor circuit with the calibration reference signal and outputs a difference signal to said calibration circuit as the control signal.