Resistant surface reflector
US6709119B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 30, 2002 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Aug 30, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/0858
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A reflector with high total reflection which is resistant to mechanical stresses. The reflector includes a reflector body and superimposed thereon (a) a functional coating such as a varnish, (b) a reflecting layer structure composed of a reflecting metallic layer and optionally arranged thereon one or several transparent ceramic layers, for example, layers having an optical depth of &lgr;/2. The reflecting layer structure contains, as its surface layer, a protective layer. The protective layer is a silicon oxide of general formula SiOx, wherein x is a number from 1.1 to 2.0, or it is aluminum oxide of formula Al2O3, in a thickness of 3 nm or more. The protective layer protects the underlying layers from mechanical damages. In the DIN 58196 abrasion test the protected surface does not show any damages after 50 test cycles with 100 abrasion strokes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.