Patent ID: 7975546
Filing Date: 2011-07-12
Classification: G01C

Abstract:
1. An angular velocity sensor comprising: a fixed portion fixed to a support surface, the fixed portion including a fixed center section, a pair of fixed beam sections, and a pair of fixed end portions, a first upper vibration arm connected to one side of the fixed portion and extending along a plane parallel to the support surface, a lower vibration arm connected to the other side of the fixed portion and extending along the plane parallel to the support surface, a second upper vibration arm and a third upper vibration arm each directly or indirectly connected to the fixed portion in such a manner as to form a pair of arms with the first upper vibration arm in between, and extending along the plane parallel to the support surface in the same direction where the first upper vibration arm extends, a pair of connection arms connected to the fixed portion and extending along the plane parallel to the support surface, a pair of first upper electrodes formed on the first upper vibration arm to be arranged side by side along a width direction of the first upper vibration arm, a pair of lower electrodes formed on the lower vibration arm to be arranged side by side along a width direction of the lower vibration arm, a pair of second upper electrodes formed on the second upper vibration arm to be arranged side by side along a width direction of the second upper vibration arm, and a pair of third upper electrodes formed on the third upper vibration arm to be arranged side by side along a width direction of the third upper vibration arm, wherein