Imaging lens
US9036277B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 10, 2013 |
| Grant date | May 19, 2015 |
| Priority date | — |
| Expiry date | Nov 22, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging lens includes a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; and a fifth lens having negative refractive power. The first lens has object-side and image plane-side surfaces with positive curvature radii. The second lens has object-side and image plane-side surfaces with positive curvature radii. The third lens has an object-side surface with a positive curvature radius and an image plane-side surface with a negative curvature radius. The fourth lens has an object-side surface with a positive curvature radius and an image plane-side surface with a negative curvature radius. The fifth lens has object-side and image plane-side surfaces with negative curvature radii. The first to fifth lenses have specific Abbe's numbers to satisfy specific conditions. The fifth lens has a specific focal length to satisfy specific conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.