Additive color-mixing light fixture employing a single moveable multi-filter array
US4894760A · kind A · utility
Inventor
Key dates
| Filing date | Sep 28, 1988 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | Sep 28, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21W2131/406
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved color-mixing light fixture that produces a beam suitable for entertainment lighting and varies the apparent color of the beam produced by additively mixing varying proportions of light having two or more different spectral energy distributions is disclosed. The disclosed fixture employs a single light source and a single light beam that provides at least one plane at which light energy passing through any given point is evenly distributed across the beam where it reaches the subject, and disposes a filter array having at least three filter segments each having a different bandpass characteristic spaced around an effective center in that plane. Rotation of the filter array about its effective center adjusts the relative proportion of the colors produced by the filter segments and displacement of it in that plane relative to the beam adjusts the relative proportions of filtered and unfiltered light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.