Method for manufacturing a gradient index optical element
US5171344A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1991 |
| Grant date | Dec 15, 1992 |
| Priority date | — |
| Expiry date | Jun 18, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S65/901
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In accordance with the present invention, the dopant within one gradient index optical element has two independent concentration distributions. Particularly to use the present invention to obtain a gradient index optical element having an excellent chromatic aberration correction ability, it is only needed to make such dopant distributions as shown in the previously stated Japanese Patent Application No. 280897/1989. However, as to the doping of a dopant into a porous body, there is a limit in the amount which can be doped. This is a disadvantage of the molecular stuffing method, but the reason for this is that the dopant must be supplied into the holes as a solution and it is largely restricted by the solubility of the dopant in the solvent. In addition, since the intra-hole fixing of the dopant depends on the solubility difference by temperature or that by solvent exchange, it is further restricted. For this, the latter process which is an application of the molecular stuffing method preferably takes the distribution that has less doping amount. Accordingly, a large concentration distribution must be provided to the dopant in the preceding process. For that, the preceding process…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.