Hybrid fresnel lens with increased field of view
US10379348B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2016 |
| Grant date | Aug 13, 2019 |
| Priority date | — |
| Expiry date | Dec 2, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens defined by a first lens surface and a second lens surface opposite to the first lens surface is disclosed. The lens includes a first portion; and a second portion that is distinct from the first portion and is located around the first portion. The first lens surface for the first portion of the lens is defined by a Fresnel surface profile. The second lens surface for the first portion of the lens is defined by a smooth surface profile. The first lens surface for a second portion of the lens is defined by a Fresnel surface profile. The second lens surface for the second portion of the lens is defined by a Fresnel surface profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.