Direct surfacing optimized lens blank
US10613348B2 · kind B2 · utility
1Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 2017 |
| Grant date | Apr 7, 2020 |
| Priority date | — |
| Expiry date | Sep 30, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A semi-finished ophthalmic lens for formation of a plurality of different finished ophthalmic lenses requiring reduced amounts of lens material to be removed for formation of the finished ophthalmic lenses and reduced rates of departure of a surfacing tool and methods of making the same. Lens material is reduced by providing first and second surfaces that have different optical powers, the second optical surface having a second curve that approximates second optical surfaces of a plurality of finished ophthalmic lenses at coordinates at which lenses of the plurality of finished ophthalmic lenses have maximum thicknesses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.