Patent ID: 9568337
Date: 2017-02-14
CPC Classifications: G01B,G01D

Claim:
1. A rotation state detection device applied to an operation device having a rotating body that rotates in response to an input of an operation force, and a supporting body that supports the rotating body rotatably, comprising: at least one first electrode arranged at the rotating body; at least one second electrode arranged at the supporting body and generating a capacitance with the first electrode, wherein the at least one first electrode and the at least one second electrode are arranged to vary the capacitance periodically each time the rotating body rotates by a predetermined angle, and make a shape of a capacitance waveform representing a change in the capacitance to be different between a situation in which the rotating body rotates forward and a situation in which the rotating body rotates backward; the rotation state detection device further comprising: a rotational angle calculation device that calculates a rotational angle of the rotating body based on the number of periodic times the capacitance varies; and a rotational direction determination device that carries out a determination on a rotational direction of the rotating body based on the shape of the capacitance waveform.