Uni-directional gradient index of refraction glasses
US5200858A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1992 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | May 11, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/0087
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Tailored glass bodies (10) having a substantial change in index of refraction (a .DELTA.n of at least about 0.08 along an axis) are provided. The glass body is characterized by two substantially parallel surfaces, with one surface having a first composition (12t) and the other surface a second composition (12b). The composition of the glass body varies in some predetermined fashion between the two surfaces (12i1-12i8) to provide a predetermined graded index of refraction. A method is also provided to tailor the glass body so that the two compositions have one or more of the following properties substantially constant: thermal coefficient of expansion, glass fusion temperature, Abbe value, and density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.