PROCESS FOR THE MANUFACTURE OF SPECTACLE LENSES
First Claim
Patent Images
1. A method for manufacturing a spectacle lens comprising using a thickness that is at least a minimum edge thickness, at least one of a plurality of a set of points associated with a thickness function, and at least one of a plurality of a set of points within a cribbed diameter to determine a contour for cutting an uncut lens blank having at least the thickness that is at least a minimum edge thickness.
4 Assignments
0 Petitions
Accused Products
Abstract
The invention provides methods for eliminating sharp edges that typically result during the production of uncut lenses.
11 Citations
19 Claims
- 1. A method for manufacturing a spectacle lens comprising using a thickness that is at least a minimum edge thickness, at least one of a plurality of a set of points associated with a thickness function, and at least one of a plurality of a set of points within a cribbed diameter to determine a contour for cutting an uncut lens blank having at least the thickness that is at least a minimum edge thickness.
-
8. A method for manufacturing a spectacle lens, comprising the steps of:
- a.) determining a minimum edge thickness for an uncut lens;
b.) using the minimum edge thickness to determine a thickness requirement;
c.) calculating a thickness function t of the uncut lens;
d.) calculating a cribbed diameter of the uncut lens;
e.) using the thickness function and cribbed diameter to determine a first set of points (220ab, 220cd) that does not satisfy the thickness requirement and a second set of points (220bc, 220ad) that satisfies the thickness requirement;
f.) determining a third set of points (230ab, 230cd) that describe a diameter contained within the cribbed diameter; and
g.) combining the second set of points with the third set of points to provide an edge contour for the uncut lens. - View Dependent Claims (9, 10, 11, 12)
- a.) determining a minimum edge thickness for an uncut lens;
- 13. A lens produced according to a method comprising using a thickness that is at least a minimum edge thickness, at least one of a plurality of a set of points associated with a thickness function, and at least one of a plurality of a set of points within a cribbed diameter to determine a contour for cutting an uncut lens blank having at least the thickness that is at least a minimum edge thickness.
Specification