Patent · US Expired

Method for producing ophthalmic lenses and other shaped bodies with optically active surfaces

US7413502B2 · kind B2 · utility

5Cited by

2References

17Claims

0Family size

Assignees

OPTOTECH OPTIKMASCHINEN GMBH · DE
Carl Zeiss Vision GmbH · DE

Inventors

Roland Mandler · Heuchelheim, DE
Reinhold Weis · Kelheim, DE

Key dates

Filing date	Sep 12, 2005
Grant date	Aug 19, 2008
Priority date	—
Expiry date	Jan 6, 2026

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/511
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

The invention concerns a method for producing ophthalmic lenses that uses plastic blanks in the form of flat, round discs. The outer edge of said plastic blanks is clamped and the desired final surface geometry and surface quality of the front faces of the lens are subsequently produced by a machining process using grinders and/or lathes and by smoothing and polishing processes. During machining, a thicker annular region is retained on the outer circumference of the workpiece. The annular region clamps or arranges the workpiece during machining and transport operations and stabilizes the lens for additional machining. Shaped pieces for identifying the machining axes are attached to the annular region. The lens is provided with fine markings to characterize the lens that has been produced, with the lens then being separated from the region.

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