Process for bevelling an ohthalmic lens including a plotting stage without contact
US7004821B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2003 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | Apr 20, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/45157
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Process for bevelling at least one edge (6) of an optical face (3) of an ophthalmic lens (1), in which the successive curvatures of the optical face (3) are plotted in the vicinity of and along the edge (6) to be bevelled. The edge (6) to be bevelled is scanned with a flat light beam (23) forming a linear light spot (24) on the optical face (3), an image of the light spot (24) is simultaneously formed on optical reception elements (26), the successive curvatures of the optical face (3) in the vicinity of the edge (6) are deduced from the successive positions of this image. This process includes a bevelling stage. Then the lens (1) is rotated about an axis (A1), is brought into contact by its edge (6) with a bevelling tool, and the relative positioning of the lens (1) and of the tool is controlled according to the plots produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.