CONFIGURATION TO REDUCE NON-LINEAR MOTION
First Claim
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1. A Micro-Electro-Mechanical Systems (MEMS) sensor comprising;
- first and second rotating arms, wherein the first and second rotating arms are coupled to each other and the first and second rotating arms are configured to counter rotate when driven into oscillation;
a first travelling system comprising a first travelling mass and a first proof mass coupled to each other;
a second travelling system comprising a second travelling mass and a second proof mass coupled to each other;
a plurality of actuators for driving the first travelling system and the second travelling system into oscillation in a first direction and causing the first and second rotating arms to counter rotate in a plane that includes the first direction;
wherein the first travelling system is coupled to the first rotating arm by a first flexible element system and the second travelling system is coupled to the second rotating arm by a second flexible element system, and wherein the first travelling mass is coupled to the second travelling mass by a third flexible element system;
a plurality of transducers associated with the first travelling system and configured to sense a first motion associated with at least a portion of the first travelling system and associated with the second travelling system and configured to sense a second motion associated with at least a portion of the second travelling system;
wherein the first motion and the second motion each comprise a first component of motion in a second direction and a second component of motion in the second direction that is in plane with and orthogonal to the first direction, and wherein the first component of motion comprises Coriolis motion as a result of angular velocity applied to the MEMS sensor orthogonal to the first direction and the second direction and the second component of motion comprises a second harmonic motion; and
wherein the plurality of transducers are electrically coupled such that, for a combination of signals associated with the first motion and the second motion, when combined, signals associated with the second harmonic motion are cancelled from the combination of signals.
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Abstract
Embodiments for modifying a spring mass configuration are disclosed that minimize the effects of unwanted nonlinear motion on a MEMS sensor. The modifications include any or any combination of providing a rigid element between rotating structures of the spring mass configuration, tuning a spring system between the rotating structures and coupling an electrical cancellation system to the rotating structures. In so doing unwanted nonlinear motion such as unwanted 2nd harmonic motion is minimized.
3 Citations
22 Claims
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1. A Micro-Electro-Mechanical Systems (MEMS) sensor comprising;
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first and second rotating arms, wherein the first and second rotating arms are coupled to each other and the first and second rotating arms are configured to counter rotate when driven into oscillation; a first travelling system comprising a first travelling mass and a first proof mass coupled to each other; a second travelling system comprising a second travelling mass and a second proof mass coupled to each other; a plurality of actuators for driving the first travelling system and the second travelling system into oscillation in a first direction and causing the first and second rotating arms to counter rotate in a plane that includes the first direction; wherein the first travelling system is coupled to the first rotating arm by a first flexible element system and the second travelling system is coupled to the second rotating arm by a second flexible element system, and wherein the first travelling mass is coupled to the second travelling mass by a third flexible element system; a plurality of transducers associated with the first travelling system and configured to sense a first motion associated with at least a portion of the first travelling system and associated with the second travelling system and configured to sense a second motion associated with at least a portion of the second travelling system; wherein the first motion and the second motion each comprise a first component of motion in a second direction and a second component of motion in the second direction that is in plane with and orthogonal to the first direction, and wherein the first component of motion comprises Coriolis motion as a result of angular velocity applied to the MEMS sensor orthogonal to the first direction and the second direction and the second component of motion comprises a second harmonic motion; and wherein the plurality of transducers are electrically coupled such that, for a combination of signals associated with the first motion and the second motion, when combined, signals associated with the second harmonic motion are cancelled from the combination of signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification