Three axis gyroscope
First Claim
1. A three axis gyroscope, comprising:
- a first gyroscope structure;
a second gyroscope structure; and
a lever spring system coupling a first linear drive mode oscillation of said first gyroscope structure and a second linear drive mode oscillation of said second gyroscope structure into one combined primary motion,wherein one of the first and second gyroscope structures comprises a two axis gyroscope structure and another of the first and second gyroscope structures comprises a one axis gyroscope structure,wherein said two axis gyroscope structure is configured to be driven into a first linear drive mode oscillation in the x-axis direction within a plane of the three axis gyroscope by exciting with driving actuators,wherein a first pair of proof masses of the two axis gyroscope structure is configured to be caused a linear detection motion in the y-axis direction by angular velocity about the z-axis, and a second pair of proof masses of the two axis gyroscope structure is configured to be caused a linear detection motion in the z-axis direction by angular velocity about the y-axis,wherein said one axis gyroscope structure is configured to be driven by coupling into a second linear drive mode oscillation in the y-axis direction within the plane of the three axis gyroscope, andwherein a pair of proof masses of the one axis gyroscope structure is configured to be caused a linear detection motion in the z-axis direction by angular velocity about the x-axis.
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Abstract
A micro-electro-mechanical device detects angular velocity, for example relating to a three axis gyroscope. The three axis gyroscope includes a two axis gyroscope structure and a one axis gyroscope structure. The gyroscope further includes a lever spring system coupling a linear drive mode oscillation of the two axis gyroscope structure and a linear drive mode oscillation of the one axis gyroscope structure into one combined primary motion. The lever spring system causes the one and two axis gyroscope structures to have equal drive mode oscillation amplitudes. A symmetrical arrangement of the lever spring system causes any reactive forces created in the lever spring system to cancel each other.
30 Citations
19 Claims
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1. A three axis gyroscope, comprising:
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a first gyroscope structure; a second gyroscope structure; and a lever spring system coupling a first linear drive mode oscillation of said first gyroscope structure and a second linear drive mode oscillation of said second gyroscope structure into one combined primary motion, wherein one of the first and second gyroscope structures comprises a two axis gyroscope structure and another of the first and second gyroscope structures comprises a one axis gyroscope structure, wherein said two axis gyroscope structure is configured to be driven into a first linear drive mode oscillation in the x-axis direction within a plane of the three axis gyroscope by exciting with driving actuators, wherein a first pair of proof masses of the two axis gyroscope structure is configured to be caused a linear detection motion in the y-axis direction by angular velocity about the z-axis, and a second pair of proof masses of the two axis gyroscope structure is configured to be caused a linear detection motion in the z-axis direction by angular velocity about the y-axis, wherein said one axis gyroscope structure is configured to be driven by coupling into a second linear drive mode oscillation in the y-axis direction within the plane of the three axis gyroscope, and wherein a pair of proof masses of the one axis gyroscope structure is configured to be caused a linear detection motion in the z-axis direction by angular velocity about the x-axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A three axis gyroscope, comprising:
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a first gyroscope means for detecting first motion; a second gyroscope means for detecting second motion; and a lever spring means coupling a first linear drive mode oscillation of the first gyroscope means and a second linear drive mode oscillation of the second gyroscope means into one combined primary motion, wherein one of the first and second gyroscope means detects motion in two axes, and wherein another of the first and second gyroscope means detects motion in one axis, wherein said first gyroscope means is configured to be driven into a first linear drive mode oscillation in the x-axis direction within a plane of the three axis gyroscope by exciting with driving actuators, wherein a first pair of proof masses of the gyroscope means for detecting motion in two axes is configured to be caused a linear detection motion in the y-axis direction by angular velocity about the z-axis, and a second pair of proof masses of the gyroscope means for detecting motion in two axes is configured to be caused a linear detection motion in the z-axis direction by angular velocity about the y-axis, wherein said gyroscope means for detecting motion in one axis is configured to be driven by coupling into a second linear drive mode oscillation in the y-axis direction within the plane of the three axis gyroscope, and wherein a pair of proof masses of the gyroscope means configured for detecting motion in one axis is configured to be caused a linear detection motion in the z-axis direction by angular velocity about the x-axis. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification