Zoom optical system, optical device and method for manufacturing the zoom optical system
US11385446B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2019 |
| Grant date | Jul 12, 2022 |
| Priority date | — |
| Expiry date | Dec 29, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A first lens group (G1) having positive refractive power, a second lens group (G2) having negative refractive power, a third lens group (G3) having positive refractive power, a fourth lens group (G4) having positive refractive power, a fifth lens group (G5) are arranged in order from an object, and a distance between the first lens group (G1) and the second lens group (G2), a distance between the second lens group (G2) and the third lens group (G3), a distance between the third lens group (G3) and the fourth lens group (G4), and a distance between the fourth lens group (G4) and the fifth lens group (G5) change upon zooming, and a lens group arranged closest to an image is approximately fixed against an image surface (I) upon zooming, and the third lens group (G3) moves along the optical axis upon focusing, and the following expression (1) is satisfied. 0.480<f3/ft<4.000 (1)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.