Patent ID: 8250920
Filing Date: 2012-08-28
Classification: B81B,G01C,G01P

Abstract:
1. An inertial sensor comprising: (a) an angular rate sensor which detects an angular rate; and (b) an acceleration sensor which detects acceleration, wherein the angular rate sensor includes: (a1) a first peripheral portion formed on a first semiconductor substrate; (a2) a first cavity portion formed in the interior of the first peripheral portion; (a3) a first fixing portion formed in the interior of the first cavity portion; (a4) a vibrating body formed in the interior of the first cavity portion; (a5) a first elastic deforming portion which is elastically deformable and connects the first fixing portion and the vibrating body; (a6) a Coriolis frame formed in the interior of the vibrating body; and (a7) a second elastic deforming portion which is elastically deformable and connects the vibrating body and the Coriolis frame, wherein the acceleration sensor includes: (b1) a second peripheral portion formed on a second semiconductor substrate; (b2) a second cavity portion formed in the interior of the second peripheral portion; (b3) a second fixing portion formed in the interior of the second cavity portion; (b4) a movable body formed in the interior of the second cavity portion; (b5) a third elastic deforming portion which is elastically deformable and connects the second fixing portion and the movable body; and (b6) an acceleration detection portion which detects acceleration applied to the acceleration sensor, wherein the first cavity portion and the second cavity portion are at a same pressure, wherein the acceleration sensor is provided with a first shift suppressing portion, which is separate from the acceleration detection portion and is constructed to provide a damping function for suppressing shifts of the movable body with respect to an acceleration, wherein the angular rate sensor further includes an angular rate detecting portion that detects a Coriolis force caused by an angular rate applied to the angular rate sensor, and wherein the angular rate sensor is provided with a second shift suppressing portion, which is separate from the angular rate detecting portion and is constructed to provide a damping function for suppressing shifts of the Coriolis frame with respect to the Coriolis force.