B-spline optimization of optical glasses especially spectacle glasses with planes of symmetry

US6974214B2 · kind B2 · utility

Assignee

• RODENSTOCK GMBH · DE

Inventors

• Andrea Welk · Munich, DE
• Helmut Altheimer · Munich, DE
• Peter Baumbach · Hersbruck, DE
• Rainer Dorsch · Reutlingen, DE
• Gregor Esser · Munich, DE
• Walter Haimerl · Munich, DE
• Herbert Pfeiffer · Munich, DE

Key dates

• Filing date: Feb 12, 2002
• Grant date: Dec 13, 2005
• Expiry date: Feb 12, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/02
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A method for optimizing an atoroidal surface of an optical lens, in particular a spectacle lens, having at least one plane of symmetry is characterized by a combination of the following features: dividing the atoroidal surface having at least one plane of symmetry into at least two regions separated by the at least one plane of symmetry; representing one of the separate regions (represented region) of this surface by a set of coefficients of B spline functions; computing sagittal heights of the represented region by B spline interpolation; computing sagittal heights in at least one other region by mirroring coefficients or coordinates at the at least one plane of symmetry; and optimizing the atoroidal surface only by varying the set of B spline coefficients of the represented region.