Zoom lens and imaging apparatus
US10168513B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2017 |
| Grant date | Jan 1, 2019 |
| Priority date | — |
| Expiry date | Dec 26, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The zoom lens consists of, in order from an object side: a first lens group that has a positive refractive power; a second lens group that has a positive refractive power; a third lens group that has a negative refractive power; a fourth lens group that has a positive refractive power; and a fifth lens group that has a positive refractive power. The first lens group and the fifth lens group remain stationary with respect to an image plane during zooming. The second lens group, the third lens group, and the fourth lens group are moved by changing distances between the lens groups and adjacent groups in a direction of an optical axis during zooming, and are positioned to be closer to the image side at a telephoto end than at a wide-angle end. A stop is provided between the fourth lens group and the fifth lens group. In addition, Conditional Expression (1) is satisfied. 0.1<fw/f4<0.5 (1)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.