Zoom lens
US9291805B1 · kind B1 · utility
0Cited by
2References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 24, 2014 |
| Grant date | Mar 22, 2016 |
| Priority date | — |
| Expiry date | Nov 24, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/143507
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens includes a first lens group having negative refractive power, a second lens group having positive refractive power and a third lens group having positive refractive power. The second lens group is disposed between the first lens group and the third lens group. The second lens group includes at least an aspheric glass lens. Through using the aspheric glass lens, the imaging quality of the disclosed zoom lens is not sensitive to temperatures changes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.