| 摘要 |
A hollow, cylindrical light conduit (10) for transporting light general ly longitudinally therethrough and distributing light therealong includes a cylindrical wall member of a transparent material. The wall member has an inner cylindrical smooth surface (14) and an outer cylindrical structured surface (12) having an array of isosceles prisms arranged side thereon. The faces of adjacent prisms extend longitudi- nally along the cylindrical wall member and are aligned at the same desired prism angle relative to one another. The light transporting performance of the lig ht conduit, achieved by total internal reflection, and the light distributing performanc e of the light conduit, specifically relative to radially aligned, high incident angle longitudinal light rays in planes parallel or near parallel to the prisms, is optimized as a function of the desired prism angle .beta. between the faces of adjacent prisms.
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