Piezoelectric motor drive circuit and method
US7227294B2 · kind B2 · utility
5Cited by
1References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2005 |
| Grant date | Jun 5, 2007 |
| Priority date | — |
| Expiry date | Apr 29, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/145
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A piezoelectric transducer is driven to mechanically oscillate a mirror at a mechanical resonant frequency with high precision despite frequency variations introduced by temperature, tolerances and ageing of components. Switches are actuated at different times in order to make the drive frequency correspond to the mechanical resonant frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.