CAPACITANCE DETECTION TYPE ROTATION SENSOR

PROBLEM TO BE SOLVED: To provide a capacitance detection type rotation sensor that can be easily miniaturized and has little constraint to its mounting position. SOLUTION: The capacitance detection type rotation sensor comprises a sensor rotor 2 having an electric conductor section 2a and a dielectric section 2b, and a pair of fixed electrodes 3 and 4 arranged in the radial direction (r direction) so as to face the plane having the dielectric section 2b of the sensor rotor 2. A CV conversion circuit 5 detects the composite capacitance of the capacitance between the fixed electrode 3 and the electric conductor section 2a and the capacitance between the fixed electrode 4 and the electric conductor section 2a. The thickness of the dielectric section 2b is set so that the capacitance during rotation varies periodically. COPYRIGHT: (C)2008,JPO&INPIT