Zoom lens, optical apparatus, and a manufacturing method of the zoom lens
US10551601B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 2016 |
| Grant date | Feb 4, 2020 |
| Priority date | — |
| Expiry date | Aug 10, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
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 are provided in order from an object. The first to fourth lens groups move on an optical axis so that zooming is performed by changing each distance between adjacent lens groups. The first lens group comprises, in order from the object, a negative lens arranged closest to the object, a negative lens and a positive lens, and when an air interval between the third and fourth lens groups in the wide-angle end state is denoted as D3T and an air interval between the third and fourth lens groups in the telephoto end state is denoted as D3T, the following condition is satisfied: 0.30<D3W/D3T<1.10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.