Zoom lens and image pickup apparatus including the same
US9952446B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 2015 |
| Grant date | Apr 24, 2018 |
| Priority date | — |
| Expiry date | Oct 17, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/145121
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a zoom lens, comprising, in order from object side to image side: first positive, second negative and third positive lens units and a rear lens group including at least one lens unit, in which: at telephoto end as compared to wide angle end, an interval between first and second lens units is increased, and an interval between second and third lens units is reduced; an interval between adjacent lens units is changed during zooming; the first lens unit consists, in order from object side to image side, of a first positive lens sub-unit, and a second negative lens sub-unit over a widest air interval; and a focal length ft of zoom lens at telephoto end, a focal length f1a of first lens sub-unit, a lateral magnification β1b of second lens sub-unit, and a lateral magnification β2t of second lens unit at telephoto end are appropriately set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.