Super-wide-angle lens system and imaging module having same
US8254040B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 23, 2010 |
| Grant date | Aug 28, 2012 |
| Priority date | — |
| Expiry date | May 2, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A super-wide-angle lens system for imaging an object on an imaging surface, includes a first lens group with negative refraction power and a second lens group with positive refraction power. The first lens group includes a first spherical lens with negative refraction power, a second spherical lens with negative refraction power, and a third spherical lens with positive refraction power. The first lens has a first surface facing the object side of the first lens group. The second lens group includes a fourth spherical lens with positive refraction power and a fifth spherical lens with negative refraction power. The system satisfies the formulas: 0.01<D/|FG1|<1, and 2<D/FG2<4, where D is the distance from the first surface to the imaging surface, FG1 is the effective focal length of the first lens group, and FG2 is the effective focal length of the second lens group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.