Projection unit having speckle suppression device based on piezoelectric actuating
US8500287B2 · kind B2 · utility
3Cited by
3References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 3, 2009 |
| Grant date | Aug 6, 2013 |
| Priority date | — |
| Expiry date | May 22, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection unit comprising a coherent light source such as a laser diode and a beam shaping element forming a light beam which is directed towards a display, characterized in that it comprises a laser speckle suppression device which is positioned between the laser source and the display and wherein the laser speckle suppression device is a diffusing element actuated randomly by a piezoelectric vibrating structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.