Zoom lens
US9594233B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2015 |
| Grant date | Mar 14, 2017 |
| Priority date | — |
| Expiry date | Dec 8, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens including a first lens group and a second lens group is provided. The first lens group having a negative refractive power is disposed between an object side and an image side and includes a first lens having a negative refractive power. The second lens group having a positive refractive power is disposed between the first lens group and the image side and includes a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from the object side to the image side. Refractive powers of the second lens, the third lens, the fourth lens and the fifth lens are positive, positive, negative and positive in sequence, wherein the first lens has a surface facing the object side, a radius of curvature of the surface is R1, and |R1|>700 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.