Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-09-21
2000-05-02
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310320, 310326, 310366, H03H 915, H01L 41047
Patent
active
060576294
ABSTRACT:
A unit for suppressing harmonic vibration of a lower order which does not have desired frequency in an overtone resonator consisting main electrodes and sub electrodes. Harmonic vibration of a lower order suppressing piezoelectric vibrator comprises main electrodes arranged on a piezoelectric substrate and sub electrodes arranged in the vicinity of the main electrodes with gaps provided therebetween. If the electric equivalent circuit of the resonator is expressed by a coupling circuit which connects in series a circuit, which connects in parallel a series resonance circuit by the sub electrodes and coupling capacity indicating that the main electrodes are coupled with the sub electrodes, to a series resonance circuit by the main electrodes, then their loop frequencies substantially coincide with each other.
REFERENCES:
patent: 1781680 (1930-11-01), Cady
patent: 3527967 (1970-09-01), Dyer et al.
patent: 3571632 (1971-03-01), De Jong
patent: 4979176 (1990-12-01), Young et al.
patent: 5773912 (1998-06-01), Saeki et al.
patent: 5828159 (1998-10-01), Miyagawa et al.
Hirama Koichi
Nakamura Kiyoshi
Dougherty Thomas M.
Kiyoshi Nakamura
Toyo Communications Equipment Co., Ltd.
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