Ring type piezoelectric ultrasonic resonator and piezoelectric ultrasonic rotary motor using the same
First Claim
1. A ring type piezoelectric ultrasonic resonator, comprising:
- a piezoelectric ceramic segmented for each quarter of wavelength of an applied AC electric field,wherein the piezoelectric ceramic is alternately polarized in polarization units each having two segments, anda sine wave AC electric field and a sine wave AC electric field having a predetermined phase difference from the sine wave AC electric field are alternately applied to each of the segments.
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Abstract
A ring type piezoelectric ultrasonic resonator includes a piezoelectric ceramic segmented for each quarter of wavelength of an applied AC electric field, wherein the piezoelectric ceramic is alternately polarized in polarization units each having two segments, and a sine wave AC electric field and a sine wave AC electric field having a predetermined phase difference from the sine wave AC electric field are alternately applied to each of the segments. Further, the number of the segments of the piezoelectric ceramic is an integral multiple of 4. Moreover, the sine wave AC electric field applied to each of the segments of the piezoelectric ceramic has a phase difference of 90-degree with respect to adjacent segments.
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Citations
8 Claims
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1. A ring type piezoelectric ultrasonic resonator, comprising:
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a piezoelectric ceramic segmented for each quarter of wavelength of an applied AC electric field, wherein the piezoelectric ceramic is alternately polarized in polarization units each having two segments, and a sine wave AC electric field and a sine wave AC electric field having a predetermined phase difference from the sine wave AC electric field are alternately applied to each of the segments. - View Dependent Claims (2, 3, 4)
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5. A piezoelectric ultrasonic rotary motor, comprising:
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a ring type piezoelectric ultrasonic resonator segmented into an integral multiple of 4 for each quarter of wavelength of an applied electric field; a stator for transmitting vibration of the resonator by contact with the resonator; a rotor rotating by a frictional force generated by a vibration of the stator; a rotary shaft attached to a center of the rotor; and a housing accommodating the resonator, the stator, the rotor, and the rotary shaft, the rotary shaft projecting therefrom, wherein the resonator is alternately polarized in polarization units each having two segments, and a sine wave AC electric field and a sine wave AC electric field having a phase difference of 90-degree from the previous sine wave AC electric field are alternately applied to the segments. - View Dependent Claims (6, 7, 8)
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Specification