Method for trimming an opthalmic lens
US8931899B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2012 |
| Grant date | Jan 13, 2015 |
| Priority date | — |
| Expiry date | Aug 29, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method for trimming an ophthalmic lens using a machining device having a load sensor for measuring a load relating to the load applied by a machine tool to the lens, includes: immobilizing the lens on an immobilizing element, and trimming the lens, while measuring the load magnitude and steering the machine tool relative to the immobilizing element so as to bring the initial contour of the ophthalmic lens to a final contour of a different shape. Between the immobilizing and trimming steps, the machine tool is steered relative to the immobilizing element so that it makes a tour around the lens without contact therewith, while measuring the unladen load magnitude, this relating to the load required to move the machine tool relative to the immobilizing element without performing machining work while steering the machine tool, during the trimming step, as a function of the unladen magnitude measured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.