Patent · US Expired

Raster cutting technology for ophthalmic lenses

US7494305B2 · kind B2 · utility

12Cited by

9References

28Claims

0Family size

Assignee

Essilor International (Compagnie Generale d'Optique) · FR

Inventors

James Daniel Riall · St. Augustine, US
Walter Dannhardt · Roanoke, US
Roland Mandler · Heuchelheim, DE
Tobias Müller · Hirschberg, DE

Key dates

Filing date	Aug 3, 2004
Grant date	Feb 24, 2009
Priority date	—
Expiry date	Sep 7, 2025

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T409/307168
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A raster cutting apparatus and method for producing accurately formed, aspheric ophthalmic lenses having a good quality surface finish. The accurate form and good surface finish are obtained by using a substantially spherically shaped cutting tool having a large radius. The methods include utilizing a cutting path which provides substantially constant cutting-force, such as a constant surface-cutting-speed raster pattern.

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