Multi-stage lens driving device
US7505219B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2007 |
| Grant date | Mar 17, 2009 |
| Priority date | — |
| Expiry date | Jan 16, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/009
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multi-stage lens driving device comprises a lens holder, a lens mounted on the lens holder, a carriage carrying the lens holder in a movable manner, at least one magnet coupled to the lens holder, at least one coil disposed on the carriage and corresponding to the magnet, and at least one yoke disposed at a predefined position of the carriage. Through the magnetic field produced by the magnet and the current action in the coil, the force generated thereof can push the lens holder to move toward a desired position, thereby achieving the effect of focusing or zooming. In addition, through the attraction between the yoke and the magnet on the lens holder, the lens holder may be secured to the predefined position. That is, the lens is firmly secured even when the coil current is shut off, thereby achieving the goal of saving power consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.