Patent ID: 7260990

Claim:
An angular velocity sensor comprising: a vibrator for detecting angular velocity, the vibrator comprising: a drive electrode unit for receiving a driving signal to drive the vibrator; a monitor electrode unit for detecting a state of driving the vibrator and outputting a detection signal; and a sensing electrode unit for outputting an angular velocity signal generated based on an angular velocity given to the vibrator, wherein the drive electrode unit, the monitor electrode unit and the sensing electrode unit are each made up of a bottom electrode formed on a substrate, a piezoelectric film made of piezoelectric material and formed on the bottom electrode, and a top electrode formed on the piezoelectric film, wherein when the piezoelectric film has a thickness of “t”, the piezoelectric film is made to have an exposed width “L” of not less than 0.3 t. the exposed width “L” extending from the end of the piezoelectric film to the end of the top electrode, and an end of the top electrode is located inside an end of the piezoelectric film so as to expose the end of the piezoelectric film beyond the end of the top electrode.