Light box for optical valve
US5661608A · kind A · utility
9Cited by
10References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1995 |
| Grant date | Aug 26, 1997 |
| Priority date | — |
| Expiry date | Apr 7, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/315
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system of retro-illumination for optical valves integrated into a system of projection is constituted by a plane array of slotted fluorescent tubes, parallel to one another, associated with a plane array of longitudinal lenses parallel to the tubes and spaced out substantially by the same pitch. This system is a compact high-output system. It enables an easy gradation of the luminous level as well as the obtaining a trichromatic sequential retro-illumination without moving parts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.