Zoom optical system, optical device and method for manufacturing the zoom optical system
US10451858B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2016 |
| Grant date | Oct 22, 2019 |
| Priority date | — |
| Expiry date | Oct 30, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, a fifth lens group are arranged in order from an object. Respective distances between the first and second lens groups, the second and third lens groups, the third and fourth lens groups, and the fourth lens and fifth lens groups change upon zooming, and a lens group arranged closest to an image is approximately fixed relative to an image surface upon zooming. The third lens group moves along the optical axis upon focusing, and the following expression (1) is satisfied: 0.480<f3/ft<4.000 (1) where ft denotes a focal length of the zoom optical system in a telephoto end state, and f3 denotes a focal length of the third lens group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.