Vibratory gyroscope

• US 5,349,856 A
• Filed: 08/04/1992
• Issued: 09/27/1994
• Est. Priority Date: 08/12/1991
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Nakamura, Takeshi
• Primary Examiner(s): Woodiel, Donald
• Application Number:
  US07/924,704
• Time in Patent Office: 784 Days
• Field of Search: 73/505, 73/504, 73/510, 73/512 R, 73/1 DC, 73/1 DV, 73/1 D
• US Class Current: 73/504.12
• CPC Class Codes: G01C 19/5649 Signal processing

Abstract

A vibratory gyroscope comprises, for example, a regular triangular columnar vibrating body, and on two side faces of the vibrating body, two driving and detecting piezoelectric elements are formed. To the piezoelectric elements, an output terminal of an oscillation circuit is connected. Further, the piezoelectric elements are connected respectively to two input terminals of a differential amplifier as a detection circuit which detects outputs thereof. An output terminal of the differential amplifier is connected to one input terminal of a differential amplifying circuit as a composite circuit through a synchronized detection circuit, a smoothing circuit and so on. Furthermore, the output terminal of the differential amplifier is connected to the other input terminal of the composite circuit through an integration circuit, an amplifying circuit and so on.

Claims

1. A vibratory gyroscope comprising:

a vibrating body;

an oscillation circuit for vibrating said vibrating body;

two detecting piezoelectric elements formed on said vibrating body for detecting vibration of said vibrating body;

a detection circuit for detecting an output signal difference of said two detecting piezoelectric elements, two input terminals of said detection circuit being connected respectively to said two detecting piezoelectric elements;

a synchronized detection circuit for detecting an output of said detection circuit in synchronism with vibration of said vibrating body, an input terminal of said synchronized detection circuit being connected to an output terminal of said detection circuit;

a smoothing circuit for smoothing an output of said synchronized detection circuit, an input terminal of said smoothing circuit being connected to an output terminal of the synchronized detection circuit;

an integration circuit for integrating said output of said detection circuit, an input terminal of said integration circuit being connected to said output terminal of said detection circuit; and

a composite circuit for composing an output of said smoothing circuit and an output of said integration circuit, one input terminal of said composite circuit being connected to an output terminal of the smoothing circuit, the other input terminal of said composite circuit being connected to an output terminal of the integration circuit.

2. A vibratory gyroscope according to claim 1, wherein said output terminal of said integration circuit is connected to said other input terminal of said composite circuit through an amplifying circuit and a variable resistor.

3. A vibratory gyroscope according to claim 2, wherein said integration circuit includes a two-stage low-pass filter.