Voice coil driving auto-focus lens module
US7612957B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2009 |
| Grant date | Nov 3, 2009 |
| Priority date | — |
| Expiry date | Apr 13, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A voice coil driving auto-focus lens module is disclosed. The voice coil driving auto-focus lens module includes a base, two conductive plates, an insulation spacer, four permanent magnets, a lens holder, an optical lens, a spring set, a coil, and a top cover. The lens holder, the optical lens and the coil form a lens set that moves synchronously while the permanent magnets are fixed on an outer circle of a leaf spring. The spring set includes a coil spring and a leaf spring. By resultant spring force due to extension or compression of the coil spring as well as the leaf spring, together with the electromagnetic force, the lens module moves fast, focuses stably and the tilt of the lens module is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.