Patent · US Active

Curved disc for modifying a power of an optical component

US8348423B2 · kind B2 · utility

1Cited by

8References

21Claims

0Family size

Assignee

Essilor International (Compagnie Generale d'Optique) · FR

Inventors

Bruno FERMIGIER · Maisons-Alfort, FR
Matthieu Koscher · Charenton-le-Pont, FR

Key dates

Filing date	Dec 4, 2008
Grant date	Jan 8, 2013
Priority date	—
Expiry date	Oct 26, 2029

Classification

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

Abstract

Disc designed to be attached to a concave curved surface of an optical component to modify an optical power of said component, the disc comprising a Fresnel lens made up of a series of Fresnel regions of spherical general shape, in which the changes of height between successive Fresnel regions are located on a concave face of the disc, and in which said Fresnel regions are made out in a special distribution. A disc of this kind maintains the dioptric quality without introducing distortions.

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