Device and method for detecting rotation angle

摘要

A device for detecting a rotation angle is provided. The device include a first coil, a second coil, and a twist prevention mechanism. The first coil detects a coordinate value. The second coil detects the rotation angle. The second coil includes signal lines extending therefrom. The second coil is rotatable around a center of the first coil without rotating the first coil. The twist prevention mechanism prevents the signal lines from twisting. The device is preferably included in a pack-shaped pointer that operates on a tablet. The pointer and tablet preferably utilize an electromagnetic induction principle to detect the coordinate value and the rotation angle.