Color filter changer
US4984143A · kind A · utility
51Cited by
11References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1989 |
| Grant date | Jan 8, 1991 |
| Priority date | — |
| Expiry date | Sep 14, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21W2131/406
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Spectral filter means (20) in which filter elements (22) have elongated planar surface areas covered with patterns of filtering material (44, 84, 94). Filter elements are independently movable parallel to their respective surface planes to positions (32) 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 (22a, 22b, 22c) for each of the primary colors and an additional element (22d) 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.