Fixed focal length optical lens system
US8331044B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 2010 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | Mar 22, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A fixed focal length optical lens system 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, wherein the first lens is a negative meniscus lens, the second lens is a positive meniscus lens, the third lens is a plano-convex or positive meniscus lens. All the curved surfaces of the first lens and the second lens are bent in the direction 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: −0.6<f1/f<−0.4; 0.5<f2/f<0.8; 0.9<f3/f<1.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.