Ultrasonic motor improved in driving efficiency
US5204577A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1992 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | May 26, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/0065
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ultrasonic motor incomprises a stator including a piezoelectric element and an elastic body capable of producing progressive vibration waves on its drive surface by excitation of the piezoelectric element, and a rotor which is driven by the progressive vibration waves produced and which includes a rotor base member and a slider member bonded to the rotor base member and brought into contact with the drive surface of the elastic body by being pressed against the same. The area of the contact portion of the slider member brought into contact with the elastic body is reduced in comparison with the area of the bonding portion of the slider member bonded to the rotor base member, thereby improving the driving efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.