Imaging lens
US8861099B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 9, 2013 |
| Grant date | Oct 14, 2014 |
| Priority date | — |
| Expiry date | Aug 9, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; and a sixth lens having negative refractive power. The first lens has an object-side with a positive curvature radius. The second lens has object-side and image plane-side surfaces with positive curvature radii. The third lens has an image plane-side surface with a negative curvature radius. The fourth lens has object-side and image plane-side surfaces with negative curvature radii. The fifth lens has object-side and image plane-side surfaces with negative curvature radii. The sixth lens has strong positive refractive power close to a periphery, and an aspheric image plane-side surface having an inflexion point. The first to sixth lenses have specific Abbe's numbers to satisfy specific conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.