Patent ID: 8991248
Filing Date: 2015-03-31
Classification: G01C

Abstract:
1. An angular velocity sensor comprising: a support body, wherein an X-axis, a Y-axis, and a Z-axis that are perpendicular to each other are defined; a retaining portion connected to the support body; first to fourth weights; a first arm having one end supported by the retaining portion and another end connected to the first weight, the first arm extending in a positive direction of the Y-axis from the one end of the first arm; a second arm having one end supported by the retaining portion and another end connected to the second weight, the second arm extending in the positive direction of the Y-axis from the one end of the second arm; a third arm having one end supported by the retaining portion and another end connected to the third weight, the third arm extending in a negative direction of the Y-axis from the one end of the third arm; a fourth arm having one end supported by the retaining portion and another end connected to the fourth weight, the fourth arm extending in the negative direction of the Y-axis from the one end of the fourth arm; a drive unit for driving the first to fourth arms in parallel to an X-Y plane that contains the X-axis and the Y-axis; a monitor unit for detecting displacements of the first to fourth arms in a direction parallel to the X-Y plane; and a detector unit for detecting displacements of the first to fourth arms, wherein the detector unit is symmetrical with respect to a first axis parallel to the X-axis, and is symmetrical with respect to a second axis parallel to the Y-axis, wherein the detector unit includes: wherein the first and third detector elements are symmetrical to each other with respect to the second axis, wherein the second and fourth detector elements are symmetrical to each other with respect to the second axis, wherein the fifth and seventh detector elements are symmetrical to each other with respect to the second axis, wherein the sixth and eighth detector elements are symmetrical to each other with respect to the second axis, wherein the first and fifth detector elements are symmetrical to each other with respect to the first axis, wherein the second and sixth detector elements are symmetrical to each other with respect to the first axis, wherein the third and seventh detector elements are symmetrical to each other with respect to the first axis, and wherein the fourth and eighth detector elements are symmetrical to each other with respect to the first axis.