Measuring and testing – Speed – velocity – or acceleration – Angular rate using gyroscopic or coriolis effect
Patent
1994-12-15
1996-11-26
Oda, Christine K.
Measuring and testing
Speed, velocity, or acceleration
Angular rate using gyroscopic or coriolis effect
7350402, G01P 904
Patent
active
055787541
ABSTRACT:
A vibration-type angular-velocity sensor which can be reduced in size in the direction of the axis of the angular-velocity to be measured. A vibration body 11 comprises a pair of parallel driving plates 121 and 122 bent into a U-shape and extending in a Y direction, and a pair of detection plates 151 and 152 are so formed as to extend in mutually opposite directions in an X-axis direction by bending outwards the distal ends of the driving plates 121 and 122, respectively. The driving plates 121 and 122 are supported at a connecting plate 13 portion by a support member 14 in such a manner as to be capable of vibration. Piezoelectric devices 161 and 162 are bonded to the surfaces of the driving plates 121 and 122, respectively. When an A.C. voltage is applied, the driving plates are vibrated in mutually opposite directions. When a rotary angular-velocity, around the Z-axis of the sensor, generates a force in a Y-axis direction, due to the Coriolis effect, on the detection plates 151, 152, the Coriolis force is detected by piezoelectric devices 171 and 172. Accordingly, detection signals proportional to the angular-velocity are outputted from the detection piezoelectric devices 171 and 172.
REFERENCES:
patent: 4598585 (1986-07-01), Boxenhorn
patent: 5476007 (1995-12-01), Nakamura
Kanda Tomoyuki
Kato Kenzi
Nippondenso Co. Ltd.
Oda Christine K.
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