Title:
PIEZOELECTRIC VIBRATION GYRO
Document Type and Number:
Japanese Patent JP3830056
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a piezoelectric vibration gyro of simple construction and manufacture, and small size and high accuracy, by forming partial electrodes for driving and for detecting on the respective apex positions of a specified isosceles triangle arranged in secific constitution.
SOLUTION: The territory surrounded with first-third partial electrodes 11, 12, 13 is only polarized in the thickness direction of a piezoelectric rectangular plate 10. In this way, when the territory surrounded with the partial electrodes 11-13 is only polarized, the piezoelectric characteristics of the polarized territory and the not polarized territory are different from each other, and hence a confined energy condition becomes favorable. When drive voltage is impressed between the second and third partial electrodes 12, 13, vibration in the X-direction is excited. When the piezoelectric rectangular plate 10 is rotated around the Z-axis under this condition, vibration due to Coriolis force is generated in the Y-direction, and hence potential diference is generated between the second and third partial electrodes 12, 13. By detecting the potential difference, intensity of the vibration due to the Coriolis force, consequently, rotary angular velocity can be detected.
Inventors:
Noriko Miyazaki
Hiroshi Abe
Hiroshi Abe
Application Number:
JP6693597A
Publication Date:
October 04, 2006
Filing Date:
March 19, 1997
Export Citation:
Assignee:
NEC TOKIN CORPORATION
International Classes:
G01C19/56; G01C19/5698; H03H9/17; (IPC1-7): G01C19/56; G01P9/04; H03H9/17
Domestic Patent References:
| JP1068625A | ||||
| JP1047967A |
Attorney, Agent or Firm:
Kenho Ikeda
Keisuke Yamamoto
Keisuke Yamamoto