Lens module
US7911716B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 2010 |
| Grant date | Mar 22, 2011 |
| Priority date | — |
| Expiry date | May 14, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens module including a first lens group, a second lens group, a third lens group, and an aperture stop is provided. The first lens group disposed between a magnified side and a reduced side has a positive refractive power. The second lens group disposed between the first lens group and the reduced side has a negative refractive power. The third lens group disposed between the second lens group and the reduced side has a positive refractive power. The aperture stop is disposed between the first lens group and the second lens group. Additionally, the distance from a center of the second surface to a center of the third surface is L1, an effective focal length is f, and the lens module satisfies 0.4<L1/f<1.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.