Optical elements for radiation comprising graphite films
US5042059A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 27, 1989 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | Feb 27, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21K2201/068
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
Optical elements for radiation comprising a graphite film obtained from a film of a polymer such as polyphenylene oxadiazole, polybenzothiazole, polybenzobisthiazole, polybenzooxazole, polybenzobisoxazole, polypyromellitimide, polyphenylene isophthalamide, polyphenylene benzoimidazole, polyphenylene benzobisimidazole, polythiazole or poly-p-phenylene-vinylene. The graphite film is obtained by pyrolysis of the polymer film at 2800.degree. C. or higher at a pressure of not lower than 4 kg/cm.sup.2 in vacuum or in an inert gas. Alternatively, the element may be made of a graphite film obtained from the polymers mentioned above and intercalated with a metal halide. The intercalated films are readily bonded by pressing in the form of a thick sheet or block. Still alternatively, the graphite films and the intercalated films may be superposed alternately and bonded by pressing, or the intercalated films may be sandwiched between the graphite films and bonded together to form a thick sheet or block. The optical element has application as a lens, monochromater, filter or analyzer for radiations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.