Spectral filter module
US4914556A · kind A · utility
50Cited by
4References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1988 |
| Grant date | Apr 3, 1990 |
| Priority date | — |
| Expiry date | Jul 26, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/023
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Spectral filter means in which filter elements have elongated planar surface areas covered with patterns of filtering material. Filter elements are independently movable parallel to their respective surface planes to positions where a given density pattern of filtering material is intersected by a beam of light and filters a given component of the light. Separate filter elements for each of the primary colors and an additional element for dimming all colors are used to control the color and intensity of a beam of light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.