Dynamic draft for Fresnel lenses
US10025101B2 · kind B2 · utility
4Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2016 |
| Grant date | Jul 17, 2018 |
| Priority date | — |
| Expiry date | Sep 13, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens includes an optically transparent substrate having a first lens surface and a second lens surface opposite to the first lens surface. The first lens surface includes a plurality of Fresnel structures. A respective Fresnel structure of the plurality of Fresnel structures includes a slope facet and a draft facet. The draft facet is characterized by a draft angle. The draft angle of the respective Fresnel structure is based on a distance of the respective Fresnel structure from a center of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.