Dynamically amplified micromachined vibratory angle measuring gyroscopes, micromachined inertial sensors and method of operation for the same
First Claim
1. An angle measuring gyroscope which measures angular position arising from angular motion comprising:
- a substrate having a first surface;
a first movable drive mass coupled to the substrate, movable in two orthogonal directions;
a second movable slave mass, movable in two orthogonal directions;
two sets of orthogonal drive electrodes coupled to the drive mass to drive the drive mass in two orthogonal directions and defined in a plane above the substrate;
two sets of orthogonal sense electrodes coupled to the slave mass to sense movement of the slave mass in two orthogonal directions and defined in the same plane as the drive electrodes; and
a two-degree of freedom suspension coupling the drive mass to the slave mass, the suspension restricting the range of motion of the drive mass to maintain movement of the drive mass within a linear regime, while allowing amplification of movement of the slave mass with respect to the drive mass.
1 Assignment
0 Petitions
Accused Products
Abstract
A micromachined angle measuring gyroscope using a dual mass architecture measures angular positions rather than angular rates. The invention decouples the effects of drive and sense through the use of a dual mass architecture, and is comprised of a single lumped drive mass, which is structurally coupled to a second lumped slave mass, where the drive mass is electrostatically driven at the first resonant frequency the system using parallel plate electrodes. The slave mass is driven to higher amplitudes than the drive mass. In the presence of rotation, the line of oscillation in both masses precesses, which is easily detectable in the slave mass due to the amplified motion, and is exactly equal to the angle of rotation. The two illustrated embodiments are z-axis realizations of this principle, where the first device uses an inner drive/outer sense architecture and the second uses an outer drive/inner sense architecture.
-
Citations
30 Claims
-
1. An angle measuring gyroscope which measures angular position arising from angular motion comprising:
-
a substrate having a first surface;
a first movable drive mass coupled to the substrate, movable in two orthogonal directions;
a second movable slave mass, movable in two orthogonal directions;
two sets of orthogonal drive electrodes coupled to the drive mass to drive the drive mass in two orthogonal directions and defined in a plane above the substrate;
two sets of orthogonal sense electrodes coupled to the slave mass to sense movement of the slave mass in two orthogonal directions and defined in the same plane as the drive electrodes; and
a two-degree of freedom suspension coupling the drive mass to the slave mass, the suspension restricting the range of motion of the drive mass to maintain movement of the drive mass within a linear regime, while allowing amplification of movement of the slave mass with respect to the drive mass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method of operating an angle measuring gyroscope which measures angular position arising from angular motion comprising:
-
driving a first movable drive mass in two orthogonal directions with drive electrodes coupled to the drive mass and defined in a plane;
coupling the motion of the drive mass to a second movable slave mass through a two-degree of freedom suspension coupling between the drive mass and the slave mass, the suspension restricting the range of motion of the drive mass to maintain movement of the drive mass within a linear regime, while allowing amplification of movement of the slave mass in two orthogonal directions with respect to the drive mass; and
sensing motion of the slave mass in two orthogonal directions with sense electrodes coupled to the slave mass and defined in the same plane as the drive electrodes. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
Specification