Optical imaging system
US10969566B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2019 |
| Grant date | Apr 6, 2021 |
| Priority date | — |
| Expiry date | Oct 23, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present disclosure discloses an optical imaging system. The optical imaging system includes, sequentially along an optical axis from an object side to an image side: a first lens to a fourth lens. The first lens, the third lens, and the fourth lens each has a positive refractive power or a negative refractive power. The second lens has a positive refractive power, and an image-side surface of the second lens is a concave surface. An image-side surface of the fourth lens is a concave surface. An effective half-diameter DT11 of an object-side surface of the first lens, an effective half-diameter DT21 of an object-side surface of the second lens, an effective half-diameter DT32 of an image-side surface of the third lens, an effective half-diameter DT42 of the image-side surface of the fourth lens and an entrance pupil diameter EPD of the optical imaging system satisfy: (DT11+DT21+DT32+DT42)/EPD≤2.4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.