ROTATION ANGLE SENSOR AND METHOD FOR DETECTING ANGLE OF ROTATION

To provide a highly precise rotation sensor using a piezoelectric element, and a method for detecting the angle of rotation using the sensor.SOLUTION: A rotation sensor 1 includes: a rotational body 3; and a flexible cantilever arm part 4 in a continuous contact with the outer periphery 33 of the rotational body 3 with a rotating free end. The rotational body 3 is formed so that the distance from the center of rotation to the outer periphery 33 continuously changes in a circumferential direction. The cantilever arm part 4 has a piezoelectric element and has a deflection amount which changes according to the angle of rotation of the rotational body 3.SELECTED DRAWING: Figure 1 【課題】圧電素子を用いた高精度な回転センサ及びこれを用いた回転角度検出方法を提供する。【解決手段】回転体３と、自由端側が回転する回転体３の外周３３と連続的に接触する可撓性の片持梁部４と、を備えた回転センサ１において、回転体３は、周方向にわたって、回転中心から外周３３までの距離が連続的に変化するよう構成され、片持梁部４は、圧電素子を有し、回転体３の回転角度に応じて撓み量が変化する。【選択図】図１