Zoom lens and image pickup apparatus
US10670834B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 2018 |
| Grant date | Jun 2, 2020 |
| Priority date | — |
| Expiry date | Dec 27, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/68
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided is a zoom lens including a plurality of lens units, in which an interval between each pair of adjacent lens units is changed during zooming. The plurality of lens units consist of, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a negative refractive power; and a rear lens group including at least one lens unit. An interval between the second lens unit and the third lens unit becomes larger at a telephoto end than at a wide angle end. The third lens unit is moved during focusing. Focal lengths of the second lens unit and the third lens unit, a focal length of the zoom lens at the wide angle end, and a back focus at the wide angle end are appropriately set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.