Zoom lens and image pickup apparatus including the same
US9207439B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2014 |
| Grant date | Dec 8, 2015 |
| Priority date | — |
| Expiry date | Jun 30, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/173
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens, including, in order from object side, a positive first unit, a negative second unit, a positive third unit, a negative fourth unit, and a positive fifth unit. The first unit includes, in order from object side, a negative first sub unit which does not move for focusing, a positive second sub unit which moves during focusing, and a positive third sub unit which does not move for focusing and includes a negative lens. 1.6<L2tm/L2t<1000.0; L2w/L3w<1.0; and −0.5<f2/f3<−0.05 are satisfied, where L2t represents an second-third unit interval at a telephoto end, L2tm represents second-third unit interval at a zoom position at which an interval between the third and fourth units is minimum, L2w represents second-third unit interval at a wide-angle end, L3w represents third-fourth unit interval at the wide-angle end, and f2 and f3 represent focal lengths of the second and third units, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.