Optical lens
US8331043B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 2010 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | Feb 25, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical lens includes a lens group and a diaphragm which is located in front of the lens group. The lens group includes three lenses, respectively the first, the second and the third lens, which are sequentially arranged as a “negative-positive-positive” separated focal power system. The first lens is a double concave negative lens, the second lens is a positive meniscus lens, and the third lens is a double convex positive lens. A concave surface of the second lens is towards the diaphragm, and the focal length of the entire optical system is f, the focal lengths of the first, the second and the third lens are respectively f1, f2, and f3, and which satisfies the following requirement: −0.7<f1/f<−0.5; 1.0<f2/f<1.3; 0.8<f3/f<1.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.