Vibration device
First Claim
1. A vibration device comprising:
- a first movable unit including a first movable portion and a second movable portion arranged in a direction parallel to a first axis and enabled to vibrate in the direction parallel to the first axis;
a second movable unit enabled to vibrate in a direction parallel to a second axis perpendicular to the first axis;
a connection unit configured to connect the first movable unit and the second movable unit together, whereinthe following relationship is satisfied;
fi>
(1+1/(2Qa))fa where a resonant frequency of the first movable unit in an in-phase mode is denoted by fi, a resonant frequency of the first movable unit in an anti-phase mode is denoted by fa, and a Q factor of resonance of the first movable unit in the anti-phase mode is denoted by Qa, andwherein the following relationship is satisfied;
fi>
(1+1/(2Qs))fs where a resonant frequency of sense vibration of the first movable unit for detecting a Coriolis force applied to the first movable unit and a Q factor of resonance are denoted by fs and Qs, respectively.
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Accused Products
Abstract
According to one embodiment, a vibration device includes a first movable unit including first and second movable portions arranged in a direction parallel to a first axis and enabled to vibrate in the direction parallel to the first axis, a second movable unit enabled to vibrate in a direction parallel to a second axis perpendicular to the first axis, and a connection unit configured to connect the first and second movable units together, wherein the following relationship is satisfied
fi>(1+1/(2Qa))fa
where a resonant frequency of the first movable unit in an in-phase mode is denoted by fi, a resonant frequency of the first movable unit in an anti-phase mode is denoted by fa, and a Q factor of resonance of the first movable unit in the anti-phase mode is denoted by Qa.
35 Citations
13 Claims
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1. A vibration device comprising:
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a first movable unit including a first movable portion and a second movable portion arranged in a direction parallel to a first axis and enabled to vibrate in the direction parallel to the first axis; a second movable unit enabled to vibrate in a direction parallel to a second axis perpendicular to the first axis; a connection unit configured to connect the first movable unit and the second movable unit together, wherein the following relationship is satisfied;
fi>
(1+1/(2Qa))fawhere a resonant frequency of the first movable unit in an in-phase mode is denoted by fi, a resonant frequency of the first movable unit in an anti-phase mode is denoted by fa, and a Q factor of resonance of the first movable unit in the anti-phase mode is denoted by Qa, and wherein the following relationship is satisfied;
fi>
(1+1/(2Qs))fswhere a resonant frequency of sense vibration of the first movable unit for detecting a Coriolis force applied to the first movable unit and a Q factor of resonance are denoted by fs and Qs, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification