Vibration-coupling type ultrasonic actuator and method for operating the same
US5073739A · kind A · utility
24Cited by
2References
18Claims
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Assignee
Inventors
Key dates
| Filing date | Feb 27, 1991 |
| Grant date | Dec 17, 1991 |
| Priority date | — |
| Expiry date | Feb 27, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/103
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ultrasonic actuator using longitudinal and bending vibrations which are effectively coupled by controlling piezoelectricity generated in one of piezoelectric members attached onto an elastic vibrational member. Discharging electric charge induced in the piezoelectric member due to vibrations excited in the vibrational member, the piezoelectric member varies in stiffness to bring about electrical asymmetry within the vibrational member and allow the vibrations induced in the vibrational member to be coupled. Consequently, the ultrasonic actuator can be activated by single-phase alternating current with high efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.