ELEMENT VIBRATING IN TWO UNCOUPLED MODES, AND USE IN VIBRATING RATE GYROSCOPE

摘要

According to the invention, a vibrating element is planar parallel to an electrical crystallographic axis (X) of a piezoelectric material such as quartz. The element comprises a beam (1) holding electrodes, a stationary portion (PF) rigidly connected to one end of the beam, and a solid portion (2) rigidly connected to the other end of the beam. The structure with facets (4, 4', 5, 5') from the chemical machining of the element has an axis of symmetry (3) parallel to the electrical axis, and the solid portion has a center of gravity on the axis of symmetry. The useful vibration modes of the vibrating element, according to which the solid portion is reciprocatingly rotated about the axis of symmetry and reciprocatingly moved parallel to the plane of the element, are uncoupled. The measurement of an angular speed by a rate gyroscope including said vibrating elements is more precise.