Patent ID: 8931342
Filing Date: 2015-01-13
Classification: B41J,G01C,G01P,H01L

Abstract:
1. A method of measuring an angular velocity with an angular velocity sensor, comprising steps of: a step (a) of preparing the angular velocity sensor comprising a substrate having a vibration part and a piezoelectric film bonded to the vibration part, wherein, the piezoelectric film comprises a piezoelectric layer, a first electrode and a second electrode; the piezoelectric layer is interposed between the first electrode and the second electrode; the first electrode comprises an electrode layer with a (001) orientation; the piezoelectric layer comprises a (Na x is not less than 0.30 and not more than 0.46; y is not less than 0.51 and not more than 0.62; the (Na one of the first and second electrodes selected therefrom is constituted of an electrode group including a drive electrode and a sense electrode; a step (b) of applying a driving voltage to the piezoelectric layer through the drive electrode and the other of the first and second electrodes selected therefrom to oscillate the vibration part; and a step (c) of measuring, through the other electrode and the sense electrode, a deformation of the vibration part caused by an angular velocity applied to the oscillating vibration part to obtain a value of the applied angular velocity; wherein an amount B of the deformation B of the piezoelectric film and an electric field A between the first electrode and the second electrode satisfy the following equation: