Patent ID: 8939024
Filing Date: 2015-01-27
Classification: G01C

Abstract:
1. An angular velocity sensor comprising: a vibrator including an arm and a weight on an XY plane composed of an X axis and a Y axis perpendicular to each other; a driving circuit for driving the vibrator; and a sensing circuit for sensing angular velocity given to the vibrator, wherein the vibrator includes a first sensing electrode on the arm, a second sensing electrode on the arm, a third sensing electrode on the arm and a fourth sensing electrode on the arm; wherein a monitor signal from a monior electrode on the vibrator is input into the driving circuit, and the driving circuit outputs a driving signal to a driving electrode on the vibrator, wherein the sensing circuit includes: wherein the first sensing electrode outputs a first signal containing a first sense component and a first monitor component, wherein the second sensing electrode outputs a second signal containing a second sense component with a phase substantially the same as a phase of the first sense component and a second monitor component with a phase substantially opposite to a phase of the first monitor component, wherein the third sensing electrode outputs a third signal containing a third sense component with a phase substantially opposite to a phase of the first sense component and a third monitor component with a phase substantially the same as a phase of the first monitor component, wherein the fourth sensing electrode outputs a third signal containing a fourth sense component with a phase substantially opposite to a phase of the first sense component and a fourth monitor component with a phase substantially opposite to a phase of the first monitor component, wherein a signal output from the first sensing terminal is input into the sensing circuit, and the sensing circuit senses an angular velocity around a Z axis substantially perpendicular to the X axis and the Y axis, wherein a signal output from the first sensing terminal is input into the first disconnection sensing circuit, and the first disconnection sensing circuit outputs a first disconnection sense signal showing that the first signal line or the second signal line is disconnected, and wherein a signal output from the second sensing terminal is input into the second disconnection sensing circuit, and the second disconnection sensing circuit outputs a disconnection sense signal showing that the third signal line or the fourth signal line is disconnected.