Piezoelectric vibration gyroscope and method for adjusting resonance frequencies of same

摘要

A piezoelectric vibration gyroscope is composed of a main body shaped into a rectangular plate and provided with obverse and reverse surfaces functioning as major surfaces, and the first and second groups of three arms projecting from the main body in opposite directions and lying on extensions of the major surfaces. The first group of the three arms is composed of two excitation driving side arms excited in an opposite phase and a nonexcitation driving side arm inserted between the two excitation driving side arms. The second group of the three arms is composed of two vibration detecting side arms vibrating in an opposite phase and a nonvibration detecting side arm inserted between the two vibration detecting side arms. The excitation driving side arms are respectively provided with driving electrodes for exciting a tangential vibration therein. The vibration detecting side arms are respectively provided with detecting electrodes for detecting a vertical vibration. The main body prevents the tangential vibration from transitting from the excitation driving side arms to the vibration detecting side arms. The vertical vibration is generated in the excitation driving electrodes because of Coriolis force caused by an anglar velocity of the piezoelectric vibration gyroscope.