Patent · US Active

Fresnel lens and optical device

US9709820B2 · kind B2 · utility

2Cited by

2References

17Claims

0Family size

Assignees

Essilor International (Compagnie Generale d'Optique) · FR
NIKON CORPORATION · JP

Inventors

Toru Fujii · Chiba, JP
Alain Goulet · Charenton-le-Pont, FR

Key dates

Filing date	May 29, 2015
Grant date	Jul 18, 2017
Priority date	—
Expiry date	Jul 23, 2035

Classification

Technology area (CPC G)Physics
CPC primaryG02C2202/20
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A refractive Fresnel lens used for an optical system including an image plane, which includes a plurality of zone lens surfaces disposed concentrically and a plurality of side wall surfaces each formed between adjacent zone lens surfaces, is characterized in that the side wall surfaces are modulated so as to spatially spread in the image plane noise light due to reflection and/or refraction at the side wall surfaces.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.