VCM control circuit
US8222841B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 2008 |
| Grant date | Jul 17, 2012 |
| Priority date | — |
| Expiry date | Oct 12, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/034
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of controlling a moving part of a voice coil motor to move from an first position to a second position, wherein the position of the moving part is controlled by the level of an electrical signal applied to a coil of the voice coil motor, a first level of the electrical signal corresponding to the first position, and a second level of the electrical signal corresponding to the second position, the method including: at a first time, changing the electrical signal from the first level to an intermediate level, the intermediate level being chosen such that a peak overshoot of the moving part corresponds to the second position; and at a second time calculated to correspond to a delay of half an oscillation period of the moving part after the first time, changing the electrical signal to the second level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.