Patent ID: 8136400

Claim:
An accelerometer device comprising; a) a substantially planar substrate having an aperture frame therein, b) one or more static electrodes plates extending into and over said aperture frame from the edge thereof, c) at least one dynamic electrode plate disposed to form capacitive circuit with respect to said one or more static electrodes plates, d) a proof mass coupled to and disposed below said dynamic electrode plate such that the COG (center of gravity) is below the plane of the dynamic electrode, e) at least one torsion beam extending from and spanning the aperture to support said one or more dynamic electrode plates, f) wherein the acceleration of said proof mass rotates said torsion beam and said at least one or more dynamic electrode plate whereby the capacitance of the circuit changes, wherein the at least one dynamic electrode plate is disposed below the static electrode plates to have a fixed gap when the torsion beam is in a neutral position and a gap that varies with distance from said torsion beam when said torsion beam rotates, and wherein the proof mass is laterally offset to dispose the center of gravity of the dynamic electrodes from the torsion beam axis.