Microgyroscope with vibratory structure having a multitude of grooves

• US 5,753,817 A
• Filed: 12/26/1996
• Issued: 05/19/1998
• Est. Priority Date: 12/27/1995
• Status: Expired due to Term

• Current Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Original Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Inventors: Cho, Young-ho, Lee, Chong-won, Song, Ci-moo, Park, Kyu-yeon
• Primary Examiner(s): Oda, Christine K.
• Application Number:
  US08/773,989
• Time in Patent Office: 509 Days
• Field of Search: 73/504.02, 73/504.04, 73/504.12, 73/504.16, 73/504.18, 73/514.29, 74/5.6 D, 361/280, 361/281
• US Class Current: 73/504.12
• CPC Class Codes: G01C 19/5755 the devices having a single sensing mass

Abstract

A microgyroscope includes a substrate, a first sensor where a plurality of stripe-shaped anodes and cathodes are alternatively arrayed in parallel on the substrate, a driver arranged to be perpendicular to a stripe length direction of the first sensor on the substrate and where a plurality of stripe-shaped anodes and cathodes are alternatively arrayed in parallel, a vibratory structure having a plurality of first grooves of a stripe shape vertically spaced from a plane of the first sensor and the driver at a predetermined height and formed in a direction congruous with a stripe length direction of first sensor and a plurality of second grooves of a stripe shape formed in a direction congruous with a stripe length direction of the driver, a support portion formed on the substrate for maintaining the vibratory structure from the substrate at a predetermined height, and elastic members for elastically connecting the vibratory structure and the support portion.

Claims

1. A microgyroscope comprising:

a substrate;

first sensing means including a plurality of stripe-shaped anodes and cathodes alternatively arrayed in parallel on said substrate and having a stripe length direction, said first sensing means being for sensing displacement of a vibratory structure;

driving means arranged to be perpendicular to said stripe length direction of said first sensing means on said substrate and including a second plurality of stripe-shaped anodes and cathodes alternatively arrayed in parallel to each other, said driving means for applying pressure to said vibratory structure;

said vibratory structure including a plurality of first grooves of a stripe shape vertically spaced from a plane of said first sensing means and said driving means at a predetermined height and formed in a direction congruous with said stripe length direction of said first sensing means, and a plurality of second grooves of a stripe shape formed in a direction congruous with said stripe length direction of said driving means;

a support portion formed on said substrate for maintaining said vibratory structure spaced from said substrate at said predetermined height; and

elastic members for elastically connecting said vibratory structure and said support portion.

2. A microgyroscope according to claim 1, further comprising second sensing means arranged at both sides of said driving means in the same shape as those of the second plurality of stripe electrodes of said driving means, said second sensing means for detecting an initial vibration state of said vibratory structure to vibrate at a natural frequency.

3. A microgyroscope according to claim 1, wherein said first sensing means is disposed at two parallel positions on said substrate and said driving means is arranged between said two positions of said first sensing means.

4. A microgyroscope according to claim 2, wherein said first sensing means is disposed at two parallel positions on said substrate and said driving means is arranged between said two positions of said first sensing means.

5. A microgyroscope according to claim 1, further comprising second sensing means having a plurality of stripe-shaped anodes and cathodes wherein the stripe shape of said first sensing means is narrower and longer than that of said second sensing means and the stripe shape of said first grooves of said vibratory structure is narrower and longer than that of said second grooves.

6. A microgyroscope according to claim 2, wherein the stripe shape of said first sensing means is narrower and longer than that of said second sensing means and the stripe shape of said first grooves of said vibratory structure is narrower and longer than that of said second grooves.

7. A microgyroscope according to claim 1, wherein a portion of said vibratory structure where said first grooves correspond to said first sensing means positioned vertically thereunder and a portion of said vibratory structure where said second grooves correspond to said driving means and said second sensing means positioned vertically thereunder.

8. A microgyroscope according to claim 2, wherein a portion of said vibratory structure where said first grooves correspond to said first sensing means positioned vertically thereunder and a portion of said vibratory structure where said second grooves correspond to said driving means and said second sensing means positioned vertically thereunder.