Microstructure for vibratory gyroscope

• US 5,450,751 A
• Filed: 05/04/1993
• Issued: 09/19/1995
• Est. Priority Date: 05/04/1993
• Status: Expired due to Term

• Current Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust), Wella Aktiengesellschaft
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Putty, Michael W., Eddy, David S.
• Primary Examiner(s): Noland, Thomas P.
• Assistant Examiner(s): Oda, Christine K.
• Application Number:
  US08/055,880
• Time in Patent Office: 868 Days
• Field of Search: 73/505, 73/517 R
• US Class Current: 73/504.18
• CPC Class Codes: G01C 19/5684 the devices involving a micromechanical structure

Abstract

A microstructure for a vibratory gyroscope has a ring portion supported in such a fashion to allow substantially undamped, high-Q radial vibration. The ring portion is electrically conductive and comprises a charge plate for a plurality of radially disposed charge conductive sites around its perimeter for sensing radial displacements thereof. The ring, its support and charge conductive sites are formed within sacrificial molds on one surface of a conventional silicon substrate which may comprise a monolithic integrated circuit.

Claims

1. A microstructure for a vibratory gyroscope comprising:

a silicon substrate platform;

a ring; and

support means adapted for substantially radially undamped support of the ring from the base.

2. A microstructure for a vibratory gyroscope comprising:

a base defining a substantially planar surface;

support member substantially perpendicular to said planar surface;

a ring; and

a plurality of equally spaced arcuate members coupling said support member and said ring for supporting said ring coaxially with said support member with a gap provided everywhere therebetween said ring and said planar surface.

3. A microstructure as claimed in claim 2 wherein said ring is charge conductive at substantially all points around the perimeter thereof.

4. A microstructure as claimed in claim 3 further comprising a plurality of charge conductive sites disposed adjacent the perimeter of said ring to form a corresponding plurality of capacitive sites therewith.

5. A microstructure as claimed in claim 3 wherein said base is a monolithic integrated circuit comprising signal conditioning circuitry.

6. A microstructure for a vibratory gyroscope comprising:

a platform having a rotation sensing axis;

a substantially ring-like vibratory member concentric with the rotation sensing axis, said vibratory member further being charge conductive;

support means adapted for substantially radially undamped support of the vibratory member from the platform; and

a plurality of charge conductive sites disposed adjacent the perimeter of said vibratory member to form a corresponding plurality of capacitive sites therewith.

7. A microstructure as claimed in claim 6 wherein said ring-like vibratory member and said support means comprise an integral substantially cylindrical structure.

8. A microstructure as claimed in claim 6 wherein:

said platform comprises a monolithic integrated circuit comprising signal conditioning and control means for establishing, maintaining and detecting the position of a standing wave pattern in the vibratory member.

9. A microstructure as claimed in claim 6 wherein said ring-like vibratory member, said support means and said plurality of charge conductive sites comprise nickel.

10. A microstructure for a vibratory gyroscope comprising:

a platform having a rotation sensing axis;

a hub secured to the platform and aligned with said axis;

a substantially ring-like vibratory member concentric with the rotation sensing axis; and

a plurality of radially compliant spokes extending outward from the hub and securing the vibratory member thereto in suspensory spaced relationship to the platform thereby providing substantially radially undamped support to the vibratory member.

11. A microstructure as claimed in claim 10 wherein said spokes are spaced equally one from the other.

12. A microstructure as claimed in claim 10 wherein:

said radially compliant spokes are characterized by an arcuate shape from the hub to the vibratory member.

13. A microstructure as claimed in claim 10 wherein:

each of said plurality of radially compliant spokes is characterized by a meandering shape from the hub to the vibratory member.