Method of making a surface with improved mechanical and optical properties
US10921491B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Feb 22, 2019 |
| Grant date | Feb 16, 2021 |
| Priority date | — |
| Expiry date | Jun 13, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for preparing a surface of an optical article to improve light reflection and light transmission properties while conserving mechanical properties as durability and scratch resistance of the surface. A blank film is deposited on a base article. The film is post processed to convert a flat surface into near close packed array of near hemispherical protuberances. The conversion done in 2 steps. First the film is scratched to honeycomb pattern. Second the article is annealed. The anneal causes sequential transformation of flat film into the array. The transformation starts from scratch lines and go to a center of each honeycomb island cell. It is driven by dewetting phenomena. Characteristic size of the protuberances is controlled by initial film thickness. For low reflectivity of visible light, the initial blanket film is near 150 nm thick.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.