Glass for the production of optical elements with refractive index gradients
US4177319A · kind A · utility
9Cited by
6References
6Claims
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Assignee
Inventor
Key dates
| Filing date | Nov 7, 1978 |
| Grant date | Dec 4, 1979 |
| Priority date | — |
| Expiry date | Nov 7, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/315
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An optical quality glass composition suitable for the production of optical elements with a refractive index gradient delta n of at least 100.times.10.sup.-4 by utilizing an ion exchange, consisting essentially of the following synthesis composition, in % by weight: ______________________________________ SiO.sub.2 56-78 MgO 6-15 Li.sub.2 O 5-14 Na.sub.2 O 3-14 K.sub.2 O 0- 9 ______________________________________ wherein the total of MgO plus Li.sub.2 O is 12-23.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.