BIREFLECTIVE LENS ELEMENT

摘要

A bireflective lens element (10) comprising a light input surface (12) and a direct transmitting area (16) communicating with the light input surface (12). A light source (30) is disposed adjacent to the light input surface (12) for projecting light into the lens element (10) to create a light emittingassembly. A first portion of input light is directed through the lens elements (10) in a first predetermined pattern. A primary (40) and a secondary reflecting area (16) is between the light input surface (12) and an illumination surface (20) surrounding the direct light transmitting area (16). A second portion of input light is redirected through the lens element (10) to the illumination surface (20) in a second predetermined pattern. Specifically, the secondary reflective area (18) has a plurality of extracting facets (42) extending inwardly into the secondary reflective area (18) for intercepting light from the primary reflective area (14). The first predetermined pattern combines with the second predetermined pattern to output light from the illumination surface (20) in a substantially uniform pattern covering the broad area of the lens element (10).