Zoom lens system, and lens barrel, image capture device, and camera system including the zoom lens system
US11668914B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2020 |
| Grant date | Jun 6, 2023 |
| Priority date | — |
| Expiry date | Aug 28, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2205/0046
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system includes: a first lens group having positive power; a second lens group having negative power; and following lens groups. The following lens groups include: a first focus lens group having negative power; and a second focus lens group having positive power, arranged adjacent to, and closer to the image than, the first focus lens group. The first and second focus lens groups move along an optical axis during focusing from an infinity focus point on a close focus point. During zooming from a wide-angle end toward a telephoto end, intervals between lens groups change with the first lens group fixed with respect to an image plane. The zoom lens system satisfies the Inequality −0.23<f2/TTL<−0.15, where TTL is an optical total length at the telephoto end and f2 is a focal length of the second lens group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.