Composite scanning unit for reducing speckle noise and laser projection system employing the same
US7826118B2 · kind B2 · utility
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23Claims
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Key dates
| Filing date | Aug 24, 2007 |
| Grant date | Nov 2, 2010 |
| Priority date | — |
| Expiry date | Jan 1, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/48
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A composite scanning unit for reducing speckle noise and a laser projection system employing the composite scanning unit are provided. The composite scanning unit includes a plurality of mirror surfaces disposed along a rotation axis, wherein at least two of the plurality of mirror surfaces sequentially scan diffraction beams having different orders on the screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.