Imaging lens
US8879173B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 24, 2012 |
| Grant date | Nov 4, 2014 |
| Priority date | — |
| Expiry date | Nov 15, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging lens includes a first lens and a third lens having negative refractive power, and a second lens and a fourth lens having positive refractive power. Curvature radiuses of surfaces of the first lens on an object side and an image plane side are positive. A curvature radius of a surface of the second lens on the object side is positive. Curvature radiuses of surfaces of the third lens on the object side and the image plane side are negative. Curvature radiuses of surfaces of the fourth lens on the object side and the image plane side are positive. The first lens has a focal length f1 and the second lens has a focal length f2, so that the following conditional expression is satisfied:−0.6<f2/f1<−0.1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.