Patent ID: 9726490
Date: 2017-08-08
CPC Classifications: G01C,G01P,H01L

Claim:
1. An angular velocity sensor comprising: a flat plate-like diaphragm including a central portion and an outer peripheral portion; a weight disposed at the central portion of the diaphragm; a support portion configured to support the outer peripheral portion of the diaphragm; a vibration exciting portion operable to excite vibration having a motion component oriented in a predetermined axis of vibration with respect to the weight; and a displacement detecting portion operable to detect displacement of the weight caused based on a Coriolis force in a direction of axis of displacement, wherein: defining a XYZ three-dimensional orthogonal coordinate system such that an origin is located at a center position of the diaphragm and a surface of the diaphragm is included in an XY plane, one of the X and Z axes is the axis of vibration and the other is the axis of displacement, and an angular velocity around the Y axis is detected based on a detection value detected by the displacement detecting portion; the weight is columnar or conic in shape; the diaphragm, the weight, and the support portion are unitarily formed; the diaphragm has such an outline shape that an outline shape of the outer peripheral portion has a straight portion or a curved portion located at each of four corner portions of a quadrangle; and, the angular velocity sensor further comprises: the outline shape of each of the four vibration exciting electrodes has curved corner portions; and the outline shape of each of the four angular velocity sensing electrodes has curved corner portions.