Vibrator

• US 5,349,261 A
• Filed: 03/25/1993
• Issued: 09/20/1994
• Est. Priority Date: 03/30/1992
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Mori, Akira, Fujimoto, Katsumi, Nakamura, Takeshi, Yoshitani, Kazuhiro
• Primary Examiner(s): Dougherty, Thomas M.
• Application Number:
  US08/036,723
• Time in Patent Office: 544 Days
• Field of Search: 310/320-322, 310/367
• US Class Current: 310/321
• CPC Class Codes: G01C 19/5663 Manufacturing; Trimming; Mounting; Housings

Abstract

A vibrator 10 includes a regular triangular prism-shaped vibrating body 12. On centers of three side faces of the vibrating body 12, piezoelectric elements 14a, 14b and 14c are formed, respectively. Two piezoelectric elements and 14b are used for driving and detecting. The other piezoelectric element 14c is used for feedback. By trimming a ledge-line portion 12a of the vibrating body 12, a resonance frequency on driving side is controlled. By trimming ledge-line portions 12b and 12c of the vibrating body 12, two resonance frequencies on detecting side are controlled.

Claims

1. A vibrator comprising:

a polygonal prism-shaped vibrating body; and

a piezoelectric element formed on a side face of said vibrating body;

wherein an intermediate portion of a ledge-line portion of said vibrating body, only where said piezoelectric element is formed, is trimmed.

2. A vibrator according to claim 1, wherein said vibrating body includes a triangular prism-shaped vibrating body.

3. A vibrator according to claim 1, wherein said vibrating body includes a quadrangular prism-shaped vibrating body.

4. A vibrator comprising:

a polygonal prism-shaped vibrating body; and

a piezoelectric element formed on a side face of said vibrating body;

wherein a resonance frequency on a vibrating direction of said vibrating body at non-rotation is different from a resonance frequency on a direction orthogonal to said side face of said vibrating body by trimming an intermediate portion of a ledge-line portion of said vibrating body only where said piezoelectric element is formed.

5. A vibrator according to claim 4, wherein said vibrating body includes a triangular prism-shaped vibrating body.

6. A vibrator according to claim 4, wherein said vibrating body includes a quadrangular prism-shaped vibrating body.