Vibrator, vibratory gyroscope, and vibration adjusting method

A vibratory gyroscope for detecting a turning angular rate about an axis of rotation, said vibratory gyroscope comprising:

• a vibrator comprising (i) a fixing part arranged in a plane, (ii) a substantially straight base part arranged in said plane and having a first end attached to said fixing part and a second end opposed thereto in the longitudinal direction of said base part, and (iii) at least one bending vibration piece arranged in said plane and having a first end attached to a portion of said base part other than said first end of said base part, and a second end distal from said first end in a longitudinal direction of said bending vibration piece, the longitudinal direction of said bending vibration piece intersecting the longitudinal direction of said base part, wherein said base part and said bending vibration piece both vibrate in a bending vibration mode substantially within said plane using said first ends thereof, respectively, as their fulcrum, and wherein one of a through hole and a hollow portion is formed through at least one of said base part and said bending vibration piece;
• excitation means for exciting vibration of one of said base part and said bending vibration piece in said plane;
• and
• detection means for detecting bending vibration of said vibrator generated by Coriolis force within said vibrator as a result of said vibrator being rotated around said axis of rotation;
• wherein one of said excitation means and said detection means is positioned on said bending vibration piece.

A vibrator comprising:

• a fixing part arranged in a plane;
• a substantially straight base part arranged in said plane and having a first end attached to said fixing part and a second end opposed thereto in the longitudinal direction of said base part;
• at least one bending vibration piece arranged in said plane and having a first end attached to a portion of said base part other than said first end of said base part, and a second end distal from said first end in a longitudinal direction of said bending vibration piece, the longitudinal direction of said bending vibration piece intersecting the longitudinal direction of said base part;
• wherein said base part and said bending vibration piece both vibrate in a bending vibration mode substantially within said plane using said first ends thereof, respectively, as their fulcrum, and wherein one of a through hole and a hollow portion is formed through at least one of said base part and said bending vibration piece;
• and
• excitation means for exciting vibration of one of said base part and said bending vibration piece in said plane.

A vibratory gyroscope for detecting a turning angular rate about an axis of rotation, said vibratory gyroscope comprising:

• a vibrator comprising (i) a fixing part arranged in a plane, (ii) a substantially straight base part arranged in said plane and having a first end attached to said fixing part and a second end opposed thereto in the longitudinal direction of said base part, and (iii) at least one bending vibration piece arranged in said plane and having a first end attached to a portion of said base part other than said first end of said base part, and a second end distal from said first end in a longitudinal direction of said bending vibration piece, the longitudinal direction of said bending vibration piece intersecting the longitudinal direction of said base part, wherein said base part and said bending vibration piece both vibrate in a bending vibration mode substantially within said plane using said first ends thereof, respectively, as their fulcrum, and wherein one of a through hole and a hollow portion is formed through said base part;
• excitation means for exciting vibration of one of said base part and said bending vibration piece in said plane;
• and
• detection means for detecting bending vibration of said vibrator generated by Coriolis force within said vibrator as a result of said vibrator being rotated around said axis of rotation;
• wherein one of said excitation means and said detection means is positioned on said bending vibration piece.

A vibrator comprising:

• a fixing part arranged in a plane;
• a substantially straight base part arranged in said plane and having a first end attached to said fixing part and a second end opposed thereto in the longitudinal direction of said base part;
• at least one bending vibration piece arranged in said plane and having a first end attached to a portion of said base part other than said first end of said base part, and a second end distal from said first end in a longitudinal direction of said bending vibration piece, the longitudinal direction of said bending vibration piece intersecting the longitudinal direction of said base part;
• wherein said base part and said bending vibration piece both vibrate in a bending vibration mode substantially within said plane using said first ends thereof, respectively, as their fulcrum, and wherein one of a through hole and a hollow portion is formed through said base part;
• and
• excitation means for exciting vibration of one of said base part and said bending vibration piece in said plane.