Projector having a plurality of retro-reflectors
US6953252B2 · kind B2 · utility
14Cited by
5References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 28, 2003 |
| Grant date | Oct 11, 2005 |
| Priority date | — |
| Expiry date | Dec 11, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0031
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A projector having a plurality of retro-reflectors. In one embodiment of the present invention, a projector includes a light source, an image forming device, a concave reflector, and a plurality of retro-reflectors. The concave reflector is positioned adjacent to the light source to reflect light emitted by the light source toward the image forming device. The plurality of retro-reflectors is configured to reflect light emitted from the light source toward the concave reflector and is positioned as sets at different respective distances from the light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.