Lens assembly
US10067315B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 27, 2015 |
| Grant date | Sep 4, 2018 |
| Priority date | — |
| Expiry date | Jun 25, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with refractive power and includes a convex surface facing the object side. The second and third lenses are with refractive power. The fourth lens is with refractive power and includes a convex surface facing the image side. The fifth lens is with negative refractive power. The lens assembly satisfies: 0≤f1/f2≤6, (Vd1+Vd2)/2>40, Vd1≥Vd3, Vd2≥Vd3, Vd5≥Vd3 wherein f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens and Vd1, Vd2, Vd3, Vd5 are Abbe numbers of the first, second, third, fifth lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.