Wide angle lens
US10203477B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 2016 |
| Grant date | Feb 12, 2019 |
| Priority date | — |
| Expiry date | Sep 21, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wide angle lens includes in sequence from an object side to an image side: a first lens having a negative refractive power and a concave image-side surface; a second lens having a positive refractive power; a third lens having a positive refractive power, a convex object-side surface and convex image-side surface; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power and a convex an image-side surface; and a sixth lens having a negative refractive power and an image-side surface that is concave in a paraxial region. The wide angle lens satisfies a conditional expression: 1.0≤f2/f≤2.0, 0.5≤f1/f4≤1.5, in which, f1 denotes an effective focal length of the first lens, f2 denotes an effective focal length of the second lens, f4 denotes an effective focal length of the fourth lens, and f denotes an effective focal length of the wide angle lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.