Article with radial refractive index gradient and process for its manufacture
US6229654A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 7, 1999 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Oct 7, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The transparent article with radial gradient index, according to the invention, comprises a matrix made of a first transparent polymer having a first refractive index n.sub.1 and a first Abbe number .nu..sub.1, a second transparent polymer, diffused into the first polymer in order to produce the radial gradient index and having a second refractive index n.sub.2, different than the first refractive index, and a second Abbe number .nu..sub.2, characterized in that it furthermore comprises an effective amount of an Abbe number modifier agent which reduces by at least 10%, preferably by at least 15%, and more preferably by at least 20%, the value of the Abbe number of that of the first or second polymer which has the refractive index with lower value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.