Device with micro-filters for selecting colors and images
US5839807A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1996 |
| Grant date | Nov 24, 1998 |
| Priority date | — |
| Expiry date | Nov 12, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21V9/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A radiation beam emitted by a polychromatic source with finite dimension is initially corrected in its vergence and distribution by a reflector or a system which operates according to refraction, diffraction, total inner reflection, effects and is incident on a matrix of micro-lenses with a square, rectangular or any other cross-section, which have the function of converging the beam towards a matrix of colored micro-filters or image micro-cells. The micro-filters or the cells corresponding to different images are two or more for each single micro-lens which is present in the matrix of micro-lenses. The dimension of the colored micro-filters is such that they intercept partially or totally the converging polychromatic beam. The selection of the color or the images is obtained by interposing the desired color in the polychromatic light beam. A movement of the plate of micro-filters enables the color or the image to be changed. The cross-section of the micro-filters and the type of micro-lenses which are used enable colored patterns with the desired light distribution to be generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.