Method for permanent visible marking of an optical article and marked optical article
US11347078B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2017 |
| Grant date | May 31, 2022 |
| Priority date | — |
| Expiry date | Nov 23, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/107
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a method for marking an optical article coated with an interference coating including at least two layers, an inner layer and an outer layer, and having reflection coefficient Re; by exposure of the inner layer, at a marking point, by way of a laser beam at a marking wavelength, in such a way as to ablate the inner layer and any layer further away from the substrate; the ablated area having a reflection coefficient Rm different from Re by at least 1%; the inner layer absorbing the marking wavelength to a greater degree than any layer further away from the substrate. Also disclosed is an optical article coated with an interference coating having at least two layers, an inner layer and an outer layer, the article including a marking pattern formed by local absence of layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.