Wide-angle lens
US10234661B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 2017 |
| Grant date | Mar 19, 2019 |
| Priority date | — |
| Expiry date | Jun 29, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/142
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wide-angle lens includes a first lens group, a second lens group, and an aperture arranged in that sequence from object side to image side. The first lens group as a whole has a positive refractive power, and includes a first lens, a second lens, a third lens, and a fourth lens. The first lens has a negative refractive power. The second lens has a negative refractive power. The third lens has a negative refractive power. The fourth lens has a positive refractive power. The second lens group as a whole has a positive refractive power, and includes a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The fifth lens has a positive refractive power. The sixth lens has a negative refractive power. The seventh lens has a positive refractive power. The eighth lens has a positive refractive power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.