Optical imaging system
US11073678B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 2017 |
| Grant date | Jul 27, 2021 |
| Priority date | — |
| Expiry date | Nov 20, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present disclosure discloses an optical imaging system, the optical imaging system including sequentially, along an optical axis from an object side to an image side, a first lens, a second lens, a third lens and a fourth lens. The first lens has a positive refractive power or a negative refractive power, an object-side surface of the first lens is a concave surface, and an image-side surface of the first lens is a convex surface; both the second lens and the third lens have positive refractive powers; and the fourth lens has a positive refractive power or a negative refractive power, wherein an abbe number V1 of the first lens and an abbe number V4 of the fourth lens satisfy: |V1−V4|≤30; and the abbe number V1 of the first lens and an abbe number V2 of the second lens satisfy: 20≤|V1−V2|≤50.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.