Method for making an object made of translucent synthetic material, in particular an ophthalmic lens, marked object and corresponding reader
US6188040A · kind A · utility
6Cited by
1References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1998 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Oct 15, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10732
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A translucent synthetic material article such as an ophthalmic lens comprises a plurality of well-shaped cells, some of which have at least one upstanding projection on their bottom walls. The projection have a height between 1/5 and 1/1 the cell depth and are upwardly tapering and wedge-shaped. The plurality of cells are arranged in rows and columns to define a matrix. When the translucent article is illuminated, the well-shaped cells with upstanding projections display enhanced contrast compared with such cells without upstanding projections, thereby producing an identification marking or the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.