Zoom lens
US8085474B2 · kind B2 · utility
6Cited by
5References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 2009 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Nov 28, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/1425
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens includes, sequentially from an object side, a first lens group having a negative refractive power; and a second lens group having a positive refractive power, where focal length is varied by changing a distance between the first lens group and the second lens group, and a first conditional expression 0.8<|f1/f2|<1.0 is satisfied, f1 being the focal length of the first lens group and f2 being the focal length of the second lens group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.