| 摘要 |
A light pipe illuminator 1 comprises a looped light pipe 3 defining an endless light path, the looped light path 3 including a substantially planar front surface 5 and a faceted back surface 7 comprising a series of angled facets 9 arranged about the loop and arranged to reflect light towards and through the planar front surface 5, and a light input port 11, 13 through which light is fed into the light pipe 3 substantially along the light path, the walls 15, 17 of the light pipe 3 arranged such that light entering the light pipe 3 travels about the loop such that the loop is illuminated through the front surface 5.
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