Zoom lens, optical apparatus, and a manufacturing method of the zoom lens
US11822063B2 · kind B2 · utility
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8References
7Claims
0Family size
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Key dates
| Filing date | Jul 1, 2021 |
| Grant date | Nov 21, 2023 |
| Priority date | — |
| Expiry date | Oct 15, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens includes, 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. 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 includes a negative lens disposed closest to the object, and a negative lens. Specified conditional expressions are satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.