H-type single crystal piezoelectric gyroscope of an oppositely polarized LiNbO3 plate

For obtaining greater accuracy and stability of piezoelectric gyroscopes, t he authors have advanced the research on H-type LiTaO3 single-crystal piezo electric gyroscopes, which combine the tuning fork vibration with H-type vi bration. In this paper, the H-type LiNbO3 gyroscope of an oppositely polari zed single crystal plate is reported. The electromechanical coupling factor of LiNbO3 is larger than that of LiTaO3 for the flexural vibration mode. U sing an oppositely polarized plate, the electrode construction without a si de electrode becomes possible. Therefore, the possibility of miniaturizing the H-type single-crystal piezoelectric gyroscope is examined to obtain the same sensitivity level. In the trial experiment, the dimensions of the LiN bO3 gyroscope were reduced to be 1/8 that of the LiTaO3 gyroscope.