Patent · US Expired

Method for manufacturing a spectacle lens for myopes

US4640587A · kind A · utility

1Cited by

5References

8Claims

0Family size

Assignee

N.V. Optimed · BE

Inventor

Gunter Henkel · Dresden, DE

Key dates

Filing date	Jan 23, 1985
Grant date	Feb 3, 1987
Priority date	—
Expiry date	Jan 23, 2005

Classification

Technology area (CPC G)Physics
CPC primaryG02C7/02
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

There is described a method for manufacturing a spectacle lens for myopes the edge thickness of which may be considered as substantial, which comprises starting with a semi-machined product with a concave hollowing which extends to the edge or substantially to the edge of the lens, milling away about 40 to 51% of the lens edge thickness, and radiusing convexly thereafter the sharp angle between said concave hollowing and the plane-milled portion of the lens which surrounds said concave hollowing.

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