Patent · US Expired

Progressive spectacle lens having two aspherical progressive surfaces

US7008058B2 · kind B2 · utility

9Cited by

9References

30Claims

0Family size

Assignee

RODENSTOCK GMBH · DE

Inventors

Walter Haimerl · Munich, DE
Herbert Pfeiffer · Munich, DE
Gregor Esser · Munich, DE
Helmut Altheimer · Munich, DE

Key dates

Filing date	Sep 13, 2004
Grant date	Mar 7, 2006
Priority date	—
Expiry date	Sep 13, 2024

Classification

Technology area (CPC G)Physics
CPC primaryG02C7/068
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A progressive spectacle lens having two aspherical and in particular progressive surfaces, i.e. surfaces contributing to the rise in the effect (addition Add.) from the distance vision portion to the near vision portion, in which the sagittal heightszi=zi(x,y)of at least one (i) progressive surface (i=1,2) are chosen such that the sagittal height z of this respective surface at the edge of the spectacle lens given byyi=fi1(x) for y≧0 andyi=fi2(x) for y<0assume predefined values without this surface (i) or the other surface (j) having a reversal of curvature forming a supporting edge.

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