Lens module
US8228611B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2010 |
| Grant date | Jul 24, 2012 |
| Priority date | — |
| Expiry date | Feb 25, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/0035
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens module has a magnified side and a reduced side having an imaging surface. The lens module includes a first, a second, and a third lens groups having positive refractive powers respectively. The first lens group includes a first and a second lenses. A value calculated by dividing a distance between a center of a surface of the first lens facing the magnified side and the imaging surface by the effective focal length of the lens module is greater than or equal to 1 and smaller than or equal to 3. The second lens group located between the first lens group and the reduced side includes a third and a fourth lenses. The third lens group located between the second lens group and the reduced side includes a fifth lens. Refractive powers of the first to the fifth lenses are negative, positive, positive, negative and positive, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.