Projection illumination system with tunnel integrator and field lens
US6857752B2 · kind B2 · utility
6Cited by
21References
58Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 11, 2003 |
| Grant date | Feb 22, 2005 |
| Priority date | — |
| Expiry date | Apr 11, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S385/901
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projector illumination system includes a tunnel integrator incorporated with a field lens at its output end. One advantage of using the field lens is to form an image of the entrance end of the tunnel integrator at the secondary stop of the illumination system when combined with other relay and/or imager field lenses in the illumination system. This reduces vignetting, resulting in an increased uniformity of illumination, and increased light throughput.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.