Optical lens
US9939611B2 · kind B2 · utility
1Cited by
12References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2014 |
| Grant date | Apr 10, 2018 |
| Priority date | — |
| Expiry date | Jan 7, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B17/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical lens including a first lens group and a second lens group is provided. The first lens group is disposed between a magnified side and a reduced side and has a negative refractive power. The first lens group includes four lenses. Two lenses closest to the magnified side in the first lens group are aspheric lenses. The second lens group is disposed between the first lens group and the reduced side and has a positive refractive power. The second lens group includes at least seven lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.