Ultrasonic motor and vibration detection method for ultrasonic motor
US7759840B2 · kind B2 · utility
5Cited by
2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2007 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | May 16, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/871
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
When a piezoelectric ceramic sheet is divided into two equal parts in a longitudinal direction and two equal parts in a width direction to form four regions, internal electrodes are disposed over each region and are disposed so that surface areas occupied in each region are substantially the same, and a longitudinal vibration is detected based on a potential difference between the internal electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.