Short-wavelength light-emitting element arranged in a container with a window having a window board formed of a calcium fluoride crystals
US7696690B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 2005 |
| Grant date | Apr 13, 2010 |
| Priority date | — |
| Expiry date | Mar 19, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/84
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A short-wavelength light-emitting element such as an ultraviolet light-emitting element or blue light-emitting element is arranged in a container which has a window with a window board formed of calcium fluoride crystals. Fluoride crystals are ones which contain either metal or metal halide, or both of them. In a production method of fluoride crystals in which the cavity of a crucible is filled with raw material powder and this crucible is heated in a vertical Bridgman furnace, a production method of fluoride crystals of the present invention is the one in which the shortest diameter of a cross section of the cavity of the crucible is small. In a crucible, whose cavity is filled with raw material powder, heated in a vertical Bridgman furnace to produce fluoride crystals, a crucible is the one in which the shortest diameter of a section of the cavity is small.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.