Vibratory gyroscope having a support member

• US 5,345,822 A
• Filed: 06/24/1992
• Issued: 09/13/1994
• Est. Priority Date: 06/28/1991
• Status: Expired due to Fees

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Sakashita, Yukio, Nakamura, Takeshi, Heinouchi, Yoshiaki
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/903,317
• Time in Patent Office: 811 Days
• Field of Search: 73/505, 73/497, 73/493, 73/431, 310/315, 310/316, 310/329
• US Class Current: 73/504.14
• CPC Class Codes: G01C 19/5663 Manufacturing; Trimming; Mounting; Housings

Abstract

A vibratory gyroscope includes a vibrator. The vibrator includes a triangular prism-shaped vibrating body. On three side faces of the vibrating body, piezoelectric elements are formed respectively. Supporting members are fixed to ridge-line portions in the vicinity of nodal points of the vibrating body. The supporting members are formed into a multi-layer structure. An elastic material having a large strength is used as inner portions of the supporting members, and a material having a good solderability is used as outer portions of the supporting members. Under the vibrator, a supporting plate is provided as a shield material. Furthermore, a work cover is provided on the side of and above the vibrator as a shield material. The supporting plate and the work cover are formed by a magnetic material such as iron, nickel, stainless steel or the like. In the vicinity of the supporting members, protective members are provided. In the outer vicinity of longitudinal opposite ends of the vibrator, protective members are provided.

Claims

1. A vibratory gyroscope comprising:

a prism-shaped vibrating body;

a plurality of piezoelectric elements formed on the side faces of said vibrating body; and

a supporting member connected to said vibrating body, said supporting member having a multi-layer structure and fixed in a vicinity of nodal points of said vibrating body,

an inside portion of said supporting member being formed by an elastic material, and an outside portion surrounding said inside portion being formed by a solderable material.

2. A vibratory gyroscope according to claim 1, further comprising

a shield member consisting of a magnetic material provided around said vibrating body.

3. A vibratory gyroscope according to claim 2, which further comprises a heater disposed in the vicinity of said vibrating body.

4. A vibratory gyroscope according to claim 3, wherein said heater includes a positive temperature coefficient element.

5. A vibratory gyroscope according to claim 3, which further comprises a material, which acts as a cushion, disposed around said vibrating body.

6. A vibratory gyroscope according to claim 5, wherein said material is formed with a material which is foamed such that respective cells of said foam do not cohere to each other.

7. A vibratory gyroscope according to claim 2, which further comprises an oscillation circuit for driving said vibrating body, and

a shield cover consisting of a magnetic material and provided so as to cover said oscillation circuit.

8. A vibratory gyroscope according to claim 2, which further comprises a shield cover which serves as a ground potential, and

a back cover connected electrically to said shield cover,

at least one of a) said shield cover and b) said back cover being formed by a material having an elasticity, and said back cover being pressed onto said shield cover against an elastic force of said material.

9. A vibratory gyroscope comprising:

a vibrator;

a supporting member for supporting said vibrator;

a first protective member disposed in a vicinity of said vibrator; and

a second protective member disposed in a vicinity of said supporting member.

10. A vibratory gyroscope according to claim 9, which further comprises a circuit board provided with said vibrator on one side of said circuit board,

an oscillation circuit provided on the other side said circuit board for driving said vibrator,

a detection circuit provided on said other side of said circuit board for detecting displacement of said vibrator, and

an intermediate board having terminals which extend through said circuit board,

said vibrator, said oscillation circuit and said detection circuit being electrically connected through said terminals of said intermediate board.

11. A vibratory gyroscope according to claim 9, wherein said second protective member prevents said supporting member from lateral displacement of the vibrator.

12. A vibratory gyroscope according to claim 9, wherein said second protective member is provided on an inner side of said supporting member.

13. A vibratory gyroscope according to claim 9, wherein said first protective member prevents said vibrator from displacement in a longitudinal direction thereof.

14. A vibratory gyroscope according to claim 9, wherein said first protective member is disposed on opposite ends of said vibrator in a longitudinal direction of the vibrator.