Variable power optical system, optical apparatus, and method for producing variable power optical system
US11378789B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 17, 2017 |
| Grant date | Jul 5, 2022 |
| Priority date | — |
| Expiry date | Feb 9, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/646
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable magnification optical system comprising, in order from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a rear lens group; upon varying magnification, the first lens group being fixed with respect to the image plane and each distance between the neighboring lens groups being varied; the rear lens group comprising a focusing lens group which is moved upon carrying out focusing; and the predetermined conditional expressions being satisfied, whereby it is possible to suppress superbly variations in aberrations upon varying the magnification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.