| 摘要 |
The present invention provides a cheap angular velocity sensor capable of detecting angular velocity with high precision by using a vibrational mode which cannot be obtained by external vibration. The angular velocity sensor includes: a vibrator ( 2 ) made of a magnetostrictive material; a first coil ( 4 ) disposed along a first plane which includes an axis (A) of the vibrator ( 2 ), the first coil enclosing the vibrator; a supporter supporting the vibrator ( 2 ) at a position where the axis (A) crosses the surface of the vibrator ( 2 ), the supporter made of a nonmagnetic material; and a second coil ( 6 ) disposed along a second plane which crosses the first plane and includes the axis (A), the second coil enclosing the vibrator ( 2 ) and the first coil ( 4 ). The first coil ( 4 ) generates a magnetic field in the vibrator ( 2 ) on the basis of an excitation current supplied, thereby making the vibrator ( 2 ) vibrate in the direction of the magnetic field, and the second coil ( 6 ) detects a magnetic flux change caused by a change in the vibration of the vibrator ( 2 ), the change in the vibration occurring depending on angular velocity.
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