Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1995-04-13
1996-10-01
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310316, 310365, 310366, 310322, H01L 4108
Patent
active
055613373
ABSTRACT:
An ultrasonic vibrating unit comprising a piezoelectric vibrator, at least a pair of electrodes D and G, electrode terminals T.sub.D and T.sub.G, a vibrating plate, and at least one bar. The piezoelectric vibrator has two end surfaces running perpendicular to the thickness direction thereof. The pair of electrodes D and G are formed on the two end surfaces, respectively. The electrode terminals T.sub.D and T.sub.G are formed on the electrodes D and G, respectively. The vibrating plate is connected to the piezoelectric vibrator. The bar is fixed to the vibrating plate such that one tip of the bar is in contact with one end surface of the vibrating plate or penetrates from one end surface to the other end surface thereof. When an electric signal with a frequency substantially equal to one of the resonance frequencies of the piezoelectric vibrator is applied to the piezoelectric vibrator through the electrode terminals T.sub.D and T.sub.G, the piezoelectric vibrator is vibrated acoustically. The acoustic vibration is transmitted to the vibrating plate through the first surface portion of the vibrating plate. The bar receives the acoustic vibration from the vibrating plate. A large vibration displacement is caused on the surface of the bar. An ultrasonic vibrating actuator is made of the ultrasonic vibrating unit and at least a moving element which is in contact with the surface of the bar. When operating the ultrasonic vibrating actuator, the moving element can be made to move by the vibration displacement caused on side surface of the bar.
REFERENCES:
patent: Re33390 (1990-10-01), Sashida
patent: 3668442 (1972-06-01), Vosseler
patent: 4314242 (1982-02-01), Kuru et al.
patent: 4453103 (1984-06-01), Vishnevsky et al.
patent: 5039899 (1991-08-01), Yamaguchi
patent: 5134334 (1992-07-01), Onishi et al.
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