Large-aperture four-piece optical lens
US12235517B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2021 |
| Grant date | Feb 25, 2025 |
| Priority date | — |
| Expiry date | Sep 2, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A large-aperture four-piece optical lens includes a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power and a fourth lens with positive focal power which are sequentially arranged. A back of the fourth lens is provided with an image surface, an aperture diaphragm is arranged at a front end of the first lens or between the second lens and the third lens, and a vignetting diaphragm is arranged on an S7 surface of the fourth lens. An equivalent focal length of the fourth lens is greater than that of the third lens, and the equivalent focal length of the fourth lens is greater than that of the first lens. Each lens has a low sensitivity to an axial tolerance and a low assembly difficulty, and an energy utilization rate can be improved by increasing a numerical aperture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.