Zoom lens and imaging apparatus
US10739555B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 2018 |
| Grant date | Aug 11, 2020 |
| Priority date | — |
| Expiry date | Jan 18, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/009
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The zoom lens consists of, in order from the object side, a first lens group that has a negative refractive power; a second lens group that has a positive refractive power; a third lens group that has a negative refractive power; and a fourth lens group that has a positive refractive power. During zooming, in each lens group, distances between the adjacent groups in the direction of the optical axis are changed. The first lens group consists of, in order from the object side, a first lens having a negative refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power. The third lens group consists of a negative lens. During focusing, only the third lens group moves along the optical axis. The zoom lens satisfies predetermined conditional expressions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.