Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1977-12-01
1979-12-11
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310366, H01L 4110
Patent
active
041785274
ABSTRACT:
A quartz crystal tuning fork vibrator comprises a monolithic quartz crystal vibrator having a tuning fork shape with a plurality of vibratable tines. A set of electrodes are adhered to opposite surfaces of the tuning fork vibrator and are arranged in such a manner that when suitable alternating voltage is applied thereto, the tines undergo flexural vibration in their fundamental or resonance mode. The electrodes on each tine surface are preferably arranged in groups of four with the center two being applied with voltage of one polarity when the outer two are applied with voltage of the other polarity thereby establishing electric fields within the tines at the outside portions thereof while no electric field is established at the center portion of the tines. All of the flexural strain is thus confined to the outside portions of the tines thereby lowering the amplitude of vibration of the tine ends to the order of 5.mu.-10.mu..
REFERENCES:
patent: 2185599 (1940-01-01), Mason
patent: 3944862 (1976-03-01), Shimoi et al.
patent: 3969641 (1976-07-01), Oguchi et al.
patent: 4099078 (1978-07-01), Shibata et al.
Adams Bruce L.
Budd Mark O.
Burns Robert E.
Kabushiki Kaisha Daini Seikosha
Lobato Emmanuel J.
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