Illumination system
US7995298B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 2007 |
| Grant date | Aug 9, 2011 |
| Priority date | — |
| Expiry date | Oct 29, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illumination system including at least one coherent light source, a light uniforming element, and a prism is provided. The coherent light source is capable of emitting a coherent beam. The light uniforming element is disposed on a transmission path of the coherent beam. The prism is disposed on the transmission path of the coherent beam and between the coherent light source and the light uniforming element. The prism has a light incident end and a light exit end. The light incident end has at least one incident polygonal pyramid portion protruding away from the light exit end. The prism is capable of rotating about an axis, and the axis extends from the light incident end to the light exit end. The illumination system effectively reduces the degree of the speckle phenomenon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.