Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1978-11-13
1981-04-14
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310361, 310369, 310365, H01L 4108
Patent
active
042622271
ABSTRACT:
A thickness-shear mode piezo-electric vibrator comprises a piezo-electric crystal operable in the thickness-shear mode, driving electrodes formed on opposed surfaces of the crystal, and an addition mass formed on at least one of the driving electrodes and positioned on the nodal line of a 3-fold harmonic vibration so that the frequency f.sub.o of the fundamental main vibration and the frequency f.sub.3s of the 3-fold harmonic vibration always satisfy the following relation within the practical application ranges of temperature and load capacitance; ##EQU1## thereby effectively eliminating or preventing the "abnormal frequency phenomenon" which would otherwise occur due to the 3-fold harmonic vibrations.
REFERENCES:
patent: 3097315 (1963-07-01), Shinada et al.
patent: 4114062 (1978-09-01), Mattuschka
Ikeno Hitoshi
Konno Tetsuro
Sugita Mitsuyuki
Yanagi Hirofumi
Adams Bruce L.
Budd Mark O.
Burns Robert E.
Kabushiki Kaisha Seikosha
Lobato Emmanuel J.
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