Vibrator, vibratory gyroscope, and vibration adjusting method
First Claim
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1. 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;
at least one pair of resonant arms arranged within said plane and extending from said fixing 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, wherein said resonant arms resonate with vibration of said base part, 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.
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Abstract
A vibrator for a vibratory gyroscope including a base part and at least one bending-vibration piece extending from the base part in a direction crossing the longitudinal direction of the base part and a fixing part for fixing one end of the base part. The base part and bending-vibration piece are formed to extend substantially in a specified plane. At the opposite side to one end of the base part, a projection projecting from the bending-vibration piece is provided, or at least a pair of resonant arms resonating with vibration of the base part, wherein the resonant arms project from the fixing part. With this arrangement, it is possible to detect a turning angular rate with high accuracy.
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Citations
17 Claims
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1. A vibrator comprising:
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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;
at least one pair of resonant arms arranged within said plane and extending from said fixing 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, wherein said resonant arms resonate with vibration of said base part, 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.
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2. A vibratory gyroscope for detecting a turning angular rate about an axis of rotation, said vibratory gyroscope comprising:
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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. - View Dependent Claims (3, 4, 5, 6)
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7. A vibrator comprising:
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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. - View Dependent Claims (8, 9, 10, 11)
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12. A vibratory gyroscope for detecting a turning angular rate about an axis of rotation, said vibratory gyroscope comprising:
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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. - View Dependent Claims (13, 14)
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15. A vibrator comprising:
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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. - View Dependent Claims (16, 17)
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Specification