Gyroscope using circular rod type piezoelectric vibrator

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

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310366, 310359, H01L 4108

Patent

active

053369602

ABSTRACT:
In a piezoelectric gyroscope system wherein a vibrating body is vibrated in a specific direction by a piezoelectric actuator and is subjected to another vibration in a direction perpendicular to the specific direction due to the Coriolis' force upon being subjected to a rotation of a rotational speed, the perpendicular vibration being detected as an electric signal representative of the rotational speed by a piezoelectric transducer, the vibrating body is made of a circular rod of a piezoelectric material having a plurality of elongated electrodes on the outer surface of the rod, in order to resolve difficulty for mounting piezoelectric transducers onto the vibrating body. A driving signal is applied to predetermined ones of the electrodes to vibrate the rod in a particular diametric direction and an output signal is detected from specific ones of the electrodes according to the vibration due to the Coriolis' force. When an even number of electrodes are provided, those electrodes are formed at equiangularly spaced positions on the outer surface of the rod. When an odd number of electrodes are provided, those electrodes are formed at equiangularly spaced positions within an angular region of (360 angular degrees.times.2/3) on the outer surface of the rod.

REFERENCES:
patent: 1861862 (1932-06-01), Hund
patent: 4489609 (1984-12-01), Burdess et al.
patent: 4655081 (1987-04-01), Burdess
patent: 5081391 (1992-01-01), Owen
Article entitled "Vibrator Gyro Using a Piezoelectric-Ceramic Bending Bar With Interdigital Electrodes" by Shigeru Oyama, Yasuhiro Yamayoshi and Hiroshi Shimizu, published in Technical Report of the Institute of Electronics, Information and Communication Engineers, Sep. 21, 1987, vol. 87, No. 176, pp. 19-26 and cover pages.

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