ROTATION INPUT DEVICE AND ROTATION DETECTING DEVICE USING THE SAME

摘要

Correct rotation direction and rotation angle are detected irrespective of a peripheral environment. A detecting device is provided with an equal interval electrode holding plate (52) having equal interval electrodes (56) along a circumference of a first circle and a fixed phase electrode holding plate (64) having a-pieces of a-phase electrodes and ß-pieces of b-phase electrodes, which are arranged along a circumference of a second circle confronted with the first circle. When a is 2 or above, two arbitrary a-phase electrodes are in positions dislocated by an angle of integer multiple of 2p/N in a rotation direction of the circumference of the second circle. When ß is two or above, two arbitrary b-phase electrodes are in positions dislocated by an angle of integer multiple of 2p/N in the rotation direction on the circumference of the second circle. The phase electrodes are arranged in such a way that the b-phase electrodes against the a-phase electrodes are not in the positions dislocated by the angle of integer multiple of p/N in the rotation direction on the circumference of the second circle.