Zoom lens and image pickup apparatus including the same
US9250426B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 16, 2014 |
| Grant date | Feb 2, 2016 |
| Priority date | — |
| Expiry date | Sep 16, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a zoom lens, comprising, in order from an object side to an image side: first to fifth lens units having positive, negative, positive, positive, and negative refractive powers, respectively. During zooming, the first, third, and fifth lens units are immovable, and the second and fourth lens units are moved. The fifth lens unit includes a partial unit (L5n) having a negative refractive power, and a partial unit (L5p) having a positive refractive power. An entire lens length (TL), a focal length (ft) of an entire system at a telephoto end, a focal length (f2) of the second lens unit, a focal length (f4) of the fourth lens unit, and a focal length (f5n) of the partial unit (L5n) are set appropriately.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.