Optical filter made of inorganic material for red light
US4626071A · kind A · utility
21Cited by
6References
7Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jun 17, 1985 |
| Grant date | Dec 2, 1986 |
| Priority date | — |
| Expiry date | Jun 17, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C2218/17
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical filter made of inorganic material for red light which transfers red light and absorbs all of the other colored lights can be realized by sticking an inorganic mixture powder pasted by mixing with screen oil on a glass substrate and firing it. The mixture includes sulfates of copper, alkali metal and alkali earth metal. The contrast of the picture displayed on a display device can be increased significantly by reducing the reflection of incident ambient light without the reduction of brightness on account of the application of the above optical filter onto the displaying screen thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.