Wide-angle lens including seven lenses of −−+++−+ or −++++−+ refractive powers
US12117593B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2021 |
| Grant date | Oct 15, 2024 |
| Priority date | — |
| Expiry date | Jan 14, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided a wide-angle lens includes: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens arranged sequentially from object surface to image surface along optic axis; first lens and sixth lens are negative focal power lenses, third lens, fourth lens, fifth lens, and seventh lens are positive focal power lenses, and second lens is negative or positive focal power lens; focal lengths of first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and the wide-angle lens are f1, f2, f3, f4, f5, f6, f7 and f respectively, satisfying: 0.3≤|f1/f|≤2.6, |f2/f|≥2, 2.3≤|f3/f|≤7.2, |f4/f|≥0.8, 0.67≤|f5/f|≤2.94, 0.32≤|f6/f|≤2.77, and |f7/f|≥0.16. The wide-angle lens can satisfy surveillance requirements of high definition and small distortion while ensuring low cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.