Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1988-05-12
1990-01-16
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310366, 310326, 310327, 310365, H01L 4108
Patent
active
048945773
ABSTRACT:
At least one pair of exciting electrodes are formed opposite to each other on two major surfaces of a piezoelectric plate. Electrodes and that portion of the piezoelectric plate which is held between at least the exciting electrodes, form a resonance region where thickness-shear vibrations of plural modes are excited. A waveguide path having a cut-off frequency higher than the frequency of at least one desired vibration excited in the resonance region, but lower than the frequencies of the thickness-shear vibrations, whose damping is desired, and excited in the resonance region, is formed and extends in a direction substantially the same as the propagating direction of the thickness-shear vibration whose damping is desired, and has a width 0.5 times or more the width of the resonance region. A vibration absorbent is arranged in the waveguide path.
REFERENCES:
patent: 3382381 (1968-05-01), Morton
patent: 4149102 (1979-04-01), Kellen
patent: 4218631 (1980-08-01), Yamaguchi
patent: 4365181 (1982-12-01), Yamamoto
Journal of The Institute of Electronics and Communications Engineers of Japan; Article entitled "Suppression of Anharmonic Spurious Modes in Quartz Resonators by Modified Electrode Design Using Charge Cancellation"; by H. Sekimoto, T. Ihara, H. Nakata and M. Miura; Jul., 1986; pp. 904-909.
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, vol. UFFC-34, No. 6, Nov. 1987, article entitled "Analysis of Trapped Energy Resonators with Tabs" by H. Sekimoto, H. Nakata, and M. Miura, pp. 674-680.
Proceedings of the Eighteenth Annual Frequency Control Symposium; 5/64; pp. 93-120.
Proceedings of the Twentieth Annual Frequency Control Symposium; 4/66; pp. 266-287.
Journal of The Institute of Electronics and Communications Engineers of Japan; 7/86.
IEEE Transactions of Ultrasonics, Ferroelectrics, and Frequency Control, vol. UFFC-34, No. 6, 11/87.
Okamoto Yukihiro
Sekimoto Hitoshi
Suganuma Toshiki
Budd Mark O.
Nihon Dempa Kogyo Co. Ltd.
LandOfFree
Piezoelectric vibrator wherein the relative vibration level of u does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Piezoelectric vibrator wherein the relative vibration level of u, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Piezoelectric vibrator wherein the relative vibration level of u will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1336938