Zoom lens, optical apparatus, and a manufacturing method of the zoom lens
US11079574B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 2019 |
| Grant date | Aug 3, 2021 |
| Priority date | — |
| Expiry date | Jan 22, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens consists of, in order from an object, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. Zooming is performed by changing respective distances between the first and second lens groups, the second and third lens groups, and the third and fourth lens groups. The first lens group consists of, in order from an object, a negative lens, a negative lens and a positive lens, the second lens group consists of five lenses, and the third lens group consists of a bi-concave negative lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.