Reflector with a resistant surface
US6310737A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2000 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | May 10, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31681
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A reflector, with high total reflection, resisting mechanical stress and having a reflector body on which the following components are superimposed (a) a functional coating, e.g., a varnish, (b) a reflection layer structure composed of a reflecting metallic layer and a transparent ceramic layer, having for instance a geometric thickness of 3 nm or more or an optical depth of .lambda.2, applied on the top of the metallic layer. The layer arranged on the surface of the reflection layer structure is formed by the transparent layer which acts simultaneously as a protection layer. The protection layer is a silicon oxide of general formula SiO.sub.x, where x is a number from 1.1 to 2.0, or is an aluminum oxide of formula Al.sub.2 O.sub.3. The protection layer protects the underlying layers from mechanical stresses. In the DIN 58196 wipe test, the protected layer shows no damage after 50 test cycles, each with 100 wiping strokes. These reflectors are useful in the field of lighting and illumination where they can be used for lighting of display units with screens, primary lighting, secondary lighting, raster lighting, light ceilings or light deflector lamella.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.