Device and a method for measuring a camber geometrical characteristic of an ophthalmic lens
US8174687B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2009 |
| Grant date | May 8, 2012 |
| Priority date | — |
| Expiry date | Mar 24, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/0264
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for measuring at least one camber geometrical characteristic of an ophthalmic lens provided on at least one of its faces with at least one position-identifying mark, the device including a support for the ophthalmic lens, and on opposite sides of the support, firstly lighting element for lighting the ophthalmic lens along at least two different lighting directions, and secondly acquisition and analysis element for acquiring and analyzing the light transmitted by the ophthalmic lens, the analysis element being adapted to identify shadows of the mark when lighted in the at least two lighting directions, and to deduce from their positions a measured value for the camber geometrical characteristic of the ophthalmic lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.