| 摘要 |
<p>A beam shaper used in projection system, having a beam channel that defines a beam inlet and a beam outlet and includes at least two internal reflecrive surfaces. The beam has a tapered or cylindrical shape and defines a beam axis before entering the beam inlet. The beam projects a projection light area having a defined shape on a plane perpendicular to the axis after passing through the beam channel. Therefore the utilization ratio of light rays is increased.</p> |
