Gradient-index-type optical device
US4971423A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1988 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Jun 1, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/1345
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A gradient index-type optical device is produced by the ion exchange process. First, a transparent dielectric body contacting an ion to be exchanged is provided with a light-absorbing portion containing also an ion to be exchanged and a coloring component at at least a part of the surface thereof. The transparent dielectric is soaked in or caused to contact a molten salt containing an ion providing a refracted index distribution for ion exchange. In the gradient index-transparent dielectric thus produced, the light-absorbing portion can have a refractive index continuous with that of the transparent dielectric body and a thermal expansion coefficient equal to or smaller than that of the transparent dielectric body, so that flare at the boundary and the stress fragility are alleviated. The optical device can also have a good size accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.