Gradient index optical element
US5166827A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 1990 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Oct 24, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/0087
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A gradient index optical element includes a first metal which is at least one kind of metal selected from the metals of Group A each having the content of 10-40 mol % in terms of oxide and a second metal which is at least one kind of metal selected from the metals of Group B each having the content of 2-15 mol % in terms of oxide, in which the first and second metals are distributed so that the concentration of one of said first and second metals increases from the center of the optical element toward the periphery and that of the other decreases. Hence, the gradient index optical element has an important advantage in practical use that the correction for chromatic aberration is excellent, that is, the Abbe's number increases as the refractive index becomes great.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.