Patent ID: 8794069

Claim:
An angular velocity sensor comprising: a vibrator arranged on a x-y plane defined by an x-direction and a y-direction perpendicular to each other; a support substrate arranged apart from the vibrator in a z-direction perpendicular to the x-y plane; an anchor section extending from the support substrate to the x-y plane on which the vibrator is arranged; a connection beam section coupling the vibrator to the anchor section, the connection beam section having an elasticity in the z-direction and an elasticity in an circumferential direction around the z-direction; a driving section vibrating the vibrator in the circumferential direction; and a plurality of first detectors detecting a displacement of the vibrator in the z-direction, wherein the vibrator includes an outer vibrator having an annular plane shape on the x-y plane and an inner vibrator having an annular plan shape on the x-y plane, and the inner vibrator is arranged in a region surrounded by an inner surface of the outer vibrator; wherein the connection beam section includes a plurality of first connection beams and a plurality of second connection beams, each of the first connection beams is coupled to the inner surface of the outer vibrator at one end and is coupled to an outer surface of the inner vibrator at the other end, each of the second connection beams is coupled to a corresponding one of the first connection beams at one end and is coupled to the anchor section at the other end, wherein the driving section vibrates the inner vibrator and the outer vibrator in opposite circumferential directions to perform a coupled vibration, and wherein the one end of each of the second connection beams is coupled to the corresponding one of the first connection beams at a vibration node of the coupled vibration performed by the inner vibrator and the outer vibrator.