Photographic optical system
US10816771B2 · kind B2 · utility
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1References
10Claims
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Assignee
Inventor
Key dates
| Filing date | Dec 30, 2018 |
| Grant date | Oct 27, 2020 |
| Priority date | — |
| Expiry date | Jul 5, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present disclosure provides a photographic optical system. The photographic optical system includes, from an object side to an image side: a first lens (having a focal length of f1), a second lens (having a focal length of f2), a third lens (having a focal length of f3), a fourth lens (having a focal length of f4), a fifth lens (having a focal length of f5) and a sixth lens (having a focal length of f6) arranged coaxially and satisfying the following relational expressions: 0.8<f1/f<1.2, −8<f2/f<−1, 400<f3/f<600, 5<f4/f<18, 0.1<f5/f<1, −1<f6/f<−0.1, where f denotes an overall focal length of the photographic optical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.