Adjusting apparatus of vibrating gyroscope

• US 5,414,320 A
• Filed: 06/16/1994
• Issued: 05/09/1995
• Est. Priority Date: 06/21/1993
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Mashio, Tasuku
• Primary Examiner(s): BUDD, MARK OSBORNE
• Application Number:
  US08/260,781
• Time in Patent Office: 327 Days
• Field of Search: 310/311, 310/312, 310/321, 310/329, 310/316, 310/317, 310/319, 29/25.35, 73/504, 73/517 R, 73/517 A, 73/468, 74/572, 51/281 R, 51/413, 51/165.71, 51/165.73
• US Class Current: 310/311
• CPC Class Codes: G01C 19/5663 Manufacturing; Trimming; Mounting; Housings
• CPC Class Codes: Y10T 29/42 Piezoelectric device making

Abstract

A vibrating gyroscope is mounted on a cutting device. The vibrating gyroscope is heated by halogen lamps, and a drift due to temperature variation is measured by a drift measuring device. Resonance frequencies in plural directions of the vibrating gyroscope are measured by a frequency measuring device. A cutting quantity of a vibrating body of the vibrating gyroscope is calculated from the drift due to a temperature variation and a difference of plural resonance frequencies by a control device. The cutting quantity of the vibrating body is decided by deliberating the cutting quantity obtained experientially. When the cutting quantity of the vibrating body is decided, rotating bar files are pressed against the vibrating body responsive thereto, thereby the vibrating body is cut.

Claims

1. An adjusting apparatus of a vibrating gyroscope for adjusting the vibrating gyroscope utilizing vibration of a vibrating body, comprising:

heating means for heating said vibrating gyroscope;

drift measuring means for measuring a drift due to a temperature variation obtained from said vibrating gyroscope by heating with said heating means;

frequency measuring means for measuring resonance frequencies of multi-directional vibrations of said vibrating gyroscope;

operation means for calculating a cutting quantity of said vibrating gyroscope from the drift due to the temperature variation measured by said drift measuring means and the resonance frequencies measured by said frequency measuring means; and

cutting means for cutting said vibrating gyroscope responsive to the cutting quantity calculated by said operation means.

2. An adjusting apparatus of a vibrating gyroscope in accordance with claim 1, wherein

in said operation means,

a variation quantity of the drift due to the temperature variation is calculated from the drift of said vibrating gyroscope at plural temperatures,

a cutting quantity of said vibrating gyroscope is calculated from the variation quantity of drift,

cutting positions and quantity of said vibrating gyroscope are decided by a weighted means of the calculated cutting quantity and a cutting quantity obtained experientially from the variation quantity of the drift due to the temperature variation, and furthermore,

whether to finish or to continue cutting of said vibrating gyroscope is determined by measuring the drift of said vibrating gyroscope due to the temperature variation again after cutting said vibrating gyroscope.

3. An adjusting apparatus of a vibrating gyroscope in accordance with claim 1, wherein a halogen lamp is used as said heating means.

4. An adjusting apparatus of a vibrating gyroscope in accordance with claim 1, wherein bar file is used as said cutting means.

5. An adjusting apparatus of a vibrating gyroscope in accordance with claim 1, wherein said vibrating body is formed into a regular triangular prism shape, and a ridge line of said vibrating body is cut by said cutting means.

6. An adjusting apparatus of a vibrating gyroscope in accordance with claim 4, wherein said vibrating body is formed into a regular triangular prism shape, and a ridge line of said vibrating body is cut by said bar file.

7. An adjusting apparatus of a vibrating gyroscope in accordance with claim 2, wherein a bar file is used as said cutting means.

8. An adjusting apparatus of a vibrating gyroscope in accordance with claim 2, wherein said vibrating body is formed into a regular triangular prism shape, and a ridge line of said vibrating body is cut by said cutting means.

9. An adjusting apparatus of a vibrating gyroscope in accordance with claim 7, wherein said vibrating body is formed into a regular triangular prism shape, and a ridge line of said vibrating body is cut by said bar file.