Zoom lens and image pickup apparatus including the same
US11327281B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 19, 2020 |
| Grant date | May 10, 2022 |
| Priority date | — |
| Expiry date | Jun 4, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a zoom lens consisting of, in order from object side to image side, a positive first lens unit, a negative second lens unit, a positive third lens unit and a rear lens group including a plurality of lens units in which intervals between adjacent lens units are changed during zooming. The first lens unit does not move during zooming. The third lens unit moves toward object side during zooming from wide angle end to telephoto end. The first lens unit includes three or more positive lenses. A focal length of zoom lens at wide angle end, a focal length of first lens unit, a distance from a lens surface closest to object side to an image plane, a back focus at wide angle end, and a focal length of a positive lens having a smallest refractive power among positive lenses included in first lens unit are appropriately set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.