Method for making a micro-electro-mechanical gyroscope
First Claim
1. A method for manufacturing a micro-electro-mechanical gyroscope, comprising:
- providing a piezoelectric substrate;
forming a pattern having a plurality of apertures therethrough; and
fabricating, using said pattern, a plurality of features on said substrate, said features comprising;
a resonator transducer for creating a first surface acoustic wave on said surface;
a pair of reflectors for reflecting said first surface acoustic wave to form a standing wave within a first region of said surface between said pair of reflectors;
a structure within said region, wherein a Coriolis force acting upon said structure creates a second surface acoustic wave; and
a first sensor transducer disposed on said surface for sensing said second surface acoustic wave; and
a second sensor transducer disposed on said surface for sensing a residual surface acoustic wave from a second region of said surface that is free of any structure that said Coriolis force can act upon, and for providing an output indicative of said residual surface acoustic wave.
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Abstract
A gyroscope comprises a piezoelectric substrate having a surface. Disposed on the surface are a resonator transducer, a pair of reflectors, a structure such as a metallic dot, and a sensor transducer. The resonator transducer creates a first surface acoustic wave on the surface. The pair of reflectors reflects the first surface acoustic wave to form a standing wave within a region of the surface between the pair of reflectors. The structure is disposed on the surface within the region, wherein a Coriolis force acting upon the structure creates a second surface acoustic wave. The sensor senses the second surface acoustic wave and provides an output indicative thereof.
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Citations
5 Claims
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1. A method for manufacturing a micro-electro-mechanical gyroscope, comprising:
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providing a piezoelectric substrate; forming a pattern having a plurality of apertures therethrough; and fabricating, using said pattern, a plurality of features on said substrate, said features comprising; a resonator transducer for creating a first surface acoustic wave on said surface; a pair of reflectors for reflecting said first surface acoustic wave to form a standing wave within a first region of said surface between said pair of reflectors; a structure within said region, wherein a Coriolis force acting upon said structure creates a second surface acoustic wave; and a first sensor transducer disposed on said surface for sensing said second surface acoustic wave; and a second sensor transducer disposed on said surface for sensing a residual surface acoustic wave from a second region of said surface that is free of any structure that said Coriolis force can act upon, and for providing an output indicative of said residual surface acoustic wave. - View Dependent Claims (2, 3, 4, 5)
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Specification